drivers/lcd/max7219.c: Add support to MAX7219 LED Matrix as LCD interface
This commit is contained in:
Alan Carvalho de Assis
Gregory Nutt
parent
471d306260
commit
829e6520e3
@ -246,6 +246,42 @@ config NOKIA6100_RGBORD
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endif
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config LCD_MAX7219
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bool "Matrix of 8x8 LEDs controlled by MAX7219"
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default n
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---help---
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Matrix of LEDs (8x8) controlled by MAX7219.
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You can use cluster of 8x8 chained together.
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if LCD_MAX7219
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config MAX7219_NHORIZONTALBLKS
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int "Number of 8x8 LEDs matrices in the horizontal (width)!"
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default 1
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---help---
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Specifies the number of physical 8x8 LED matrices that are
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connected together in the horizontal. In fact we have only
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a single strip, but it can be arranged in blocks creating
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physically horizontal/vertical columns/rows.
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config MAX7219_NVERTICALBLKS
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int "Number of 8x8 LEDs matrices in the vertical (height)!"
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default 1
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---help---
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Specifies the number of physical 8x8 LED matrices that are
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connected together in the vertical. In fact we have only
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a single strip, but it can be arranged in blocks creating
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physically horizontal/vertical columns/rows.
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config MAX7219_INTENSITY
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int "Default LED Matrix bright intensity"
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default 10
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range 0 15
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---help---
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Specifies the default LEDs bright intensity to use.
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endif # LCD_MAX7219
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config LCD_MIO283QT2
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bool "MIO283QT-2 TFT LCD Display Module"
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default n
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@ -83,6 +83,10 @@ ifeq ($(CONFIG_LCD_MIO283QT2),y)
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CSRCS += mio283qt2.c
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endif
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ifeq ($(CONFIG_LCD_MAX7219),y)
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CSRCS += max7219.c
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endif
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ifeq ($(CONFIG_LCD_MIO283QT9A),y)
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CSRCS += mio283qt9a.c
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endif
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912
drivers/lcd/max7219.c
Normal file
912
drivers/lcd/max7219.c
Normal file
@ -0,0 +1,912 @@
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/****************************************************************************
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* drivers/lcd/max7219.c
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* Driver for the Maxim MAX7219 used for driver 8x8 LED display chains.
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*
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* Copyright (C) 2017 Alan Carvalho de Assis. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/lcd/lcd.h>
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#include <nuttx/lcd/max7219.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* MAX7219 Configuration Settings:
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*
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* CONFIG_MAX7219_NHORIZONTALBLKS - Specifies the number of physical
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* MAX7219 devices that are connected together horizontally.
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*
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* CONFIG_MAX7219_NVERTICALBLKS - Specifies the number of physical
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* MAX7219 devices that are connected together vertically.
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*
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* CONFIG_LCD_INTENSITY - Defines the default bright of LEDs.
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*
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* Required LCD driver settings:
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* CONFIG_LCD_MAX7219 - Enable MAX7219 support
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*
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*/
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/* Verify that all configuration requirements have been met */
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/* SPI frequency */
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#ifndef CONFIG_MAX7219_FREQUENCY
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# define CONFIG_MAX7219_FREQUENCY 10000000
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#endif
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/* MAX7219_NHORIZONTALBLKS determines the number of physical 8x8 LEDs
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* matrices that are used connected horizontally.
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*/
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#ifndef CONFIG_MAX7219_NHORIZONTALBLKS
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# define CONFIG_MAX7219_NHORIZONTALBLKS 1
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#endif
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/* MAX7219_NVERTICALBLKS determines the number of physical 8x8 LEDs
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* matrices that are used connected vertically.
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*/
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#ifndef CONFIG_MAX7219_NVERTICALBLKS
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# define CONFIG_MAX7219_NVERTICALBLKS 1
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#endif
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/* Current driver is not prepared for multiples rows of LED Matrix */
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#if CONFIG_MAX7219_NVERTICALBLKS > 1
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# error "This driver doesn't support yet blocks in the vertical!"
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#endif
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#if CONFIG_LCD_MAXCONTRAST > 15
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# undef CONFIG_LCD_MAXCONTRAST
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# define CONFIG_LCD_MAXCONTRAST 15
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#endif
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/* Color is 1bpp monochrome with leftmost column contained in bits 0 */
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#ifdef CONFIG_NX_DISABLE_1BPP
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# warning "1 bit-per-pixel support needed"
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#endif
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/* Color Properties *********************************************************/
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/* The MAX7219 chip can handle resolution of 8x8, 16x8, 8x16, 16x16, 24x8,
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* etc.
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*/
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/* Display Resolution */
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#define MAX7219_XRES (8 * CONFIG_MAX7219_NHORIZONTALBLKS)
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#define MAX7219_YRES (8 * CONFIG_MAX7219_NVERTICALBLKS)
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/* Color depth and format */
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#define MAX7219_BPP 1
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#define MAX7219_COLORFMT FB_FMT_Y1
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/* Bytes per logical row and actual device row */
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#define MAX7219_XSTRIDE (MAX7219_XRES >> 3) /* Pixels arrange "horizontally for user" */
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#define MAX7219_YSTRIDE (MAX7219_YRES >> 3) /* Pixels arrange "vertically for user" */
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/* The size of the shadow frame buffer */
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#define MAX7219_FBSIZE (MAX7219_XRES * MAX7219_YSTRIDE) + 1
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/* Bit helpers */
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#define LS_BIT (1 << 0)
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#define MS_BIT (1 << 7)
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#define BIT(nr) (1 << (nr))
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#define BITS_PER_BYTE 8
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#define BIT_MASK(nr) (1 << ((nr) % BITS_PER_BYTE))
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#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
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/****************************************************************************
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* Private Type Definition
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****************************************************************************/
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/* This structure describes the state of this driver */
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struct max7219_dev_s
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{
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/* Publically visible device structure */
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struct lcd_dev_s dev;
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/* Private LCD-specific information follows */
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FAR struct spi_dev_s *spi;
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uint8_t contrast;
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uint8_t powered;
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/* The MAX7219 does not support reading from the display memory in SPI mode.
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* Since there is 1 BPP and access is byte-by-byte, it is necessary to keep
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* a shadow copy of the framebuffer memory.
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*/
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uint8_t fb[MAX7219_FBSIZE];
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};
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/****************************************************************************
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* Private Function Protototypes
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****************************************************************************/
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/* SPI helpers */
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static void max7219_select(FAR struct spi_dev_s *spi);
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static void max7219_deselect(FAR struct spi_dev_s *spi);
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/* LCD Data Transfer Methods */
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static int max7219_putrun(fb_coord_t row, fb_coord_t col,
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FAR const uint8_t *buffer, size_t npixels);
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static int max7219_getrun(fb_coord_t row, fb_coord_t col,
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FAR uint8_t *buffer, size_t npixels);
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/* LCD Configuration */
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static int max7219_getvideoinfo(FAR struct lcd_dev_s *dev,
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FAR struct fb_videoinfo_s *vinfo);
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static int max7219_getplaneinfo(FAR struct lcd_dev_s *dev,
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unsigned int planeno, FAR struct lcd_planeinfo_s *pinfo);
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/* LCD RGB Mapping */
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#ifdef CONFIG_FB_CMAP
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# error "RGB color mapping not supported by this driver"
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#endif
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/* Cursor Controls */
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#ifdef CONFIG_FB_HWCURSOR
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# error "Cursor control not supported by this driver"
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#endif
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/* LCD Specific Controls */
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static int max7219_getpower(FAR struct lcd_dev_s *dev);
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static int max7219_setpower(FAR struct lcd_dev_s *dev, int power);
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static int max7219_getcontrast(FAR struct lcd_dev_s *dev);
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static int max7219_setcontrast(FAR struct lcd_dev_s *dev,
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unsigned int contrast);
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/* Initialization */
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static inline void up_clear(FAR struct max7219_dev_s *priv);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This is working memory allocated by the LCD driver for each LCD device
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* and for each color plane. This memory will hold one raster line of data.
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* The size of the allocated run buffer must therefore be at least
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* (bpp * xres / 8). Actual alignment of the buffer must conform to the
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* bitwidth of the underlying pixel type.
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*
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* If there are multiple planes, they may share the same working buffer
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* because different planes will not be operate on concurrently. However,
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* if there are multiple LCD devices, they must each have unique run buffers.
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*/
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static uint8_t g_runbuffer[MAX7219_XSTRIDE + 1];
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/* This structure describes the overall LCD video controller */
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static const struct fb_videoinfo_s g_videoinfo =
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{
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MAX7219_COLORFMT, /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */
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MAX7219_XRES, /* Horizontal resolution in pixel columns */
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MAX7219_YRES, /* Vertical resolution in pixel rows */
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1, /* Number of color planes supported */
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};
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/* This is the standard, NuttX Plane information object */
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static const struct lcd_planeinfo_s g_planeinfo =
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{
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max7219_putrun, /* Put a run into LCD memory */
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max7219_getrun, /* Get a run from LCD memory */
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(FAR uint8_t *)g_runbuffer, /* Run scratch buffer */
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MAX7219_BPP, /* Bits-per-pixel */
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};
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/* This is the standard, NuttX LCD driver object */
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static struct max7219_dev_s g_max7219dev =
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{
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/* struct lcd_dev_s */
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{
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/* LCD Configuration */
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max7219_getvideoinfo,
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max7219_getplaneinfo,
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#ifdef CONFIG_FB_CMAP
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/* LCD RGB Mapping -- Not supported */
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NULL,
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NULL,
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#endif
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#ifdef CONFIG_FB_HWCURSOR
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/* Cursor Controls -- Not supported */
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NULL,
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NULL,
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#endif
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/* LCD Specific Controls */
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max7219_getpower,
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max7219_setpower,
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max7219_getcontrast,
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max7219_setcontrast,
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},
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* __set_bit - Set a bit in memory
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*
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* nr - The bit to set
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* addr - The address to start counting from
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*
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* Unlike set_bit(), this function is non-atomic and may be reordered.
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* If it's called on the same region of memory simultaneously, the effect
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* may be that only one operation succeeds.
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*
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****************************************************************************/
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static inline void __set_bit(int nr, uint8_t * addr)
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{
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uint8_t mask = BIT_MASK(nr);
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uint8_t *p = ((uint8_t *) addr) + BIT_BYTE(nr);
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*p |= mask;
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}
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static inline void __clear_bit(int nr, uint8_t * addr)
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{
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uint8_t mask = BIT_MASK(nr);
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uint8_t *p = ((uint8_t *) addr) + BIT_BYTE(nr);
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*p &= ~mask;
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}
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static inline int __test_bit(int nr, const volatile uint8_t * addr)
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{
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return 1 & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE - 1)));
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}
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/****************************************************************************
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* Name: max7219_powerstring
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*
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* Description:
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* Convert the power setting to a string.
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*
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****************************************************************************/
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static inline FAR const char *max7219_powerstring(uint8_t power)
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{
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if (power == MAX7219_POWER_OFF)
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{
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return "OFF";
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}
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else if (power == MAX7219_POWER_ON)
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{
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return "ON";
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}
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else
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{
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return "ERROR";
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}
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}
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/****************************************************************************
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* Name: max7219_select
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*
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* Description:
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* Select the SPI, locking and re-configuring if necessary
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*
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* Parameters:
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* spi - Reference to the SPI driver structure
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void max7219_select(FAR struct spi_dev_s *spi)
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{
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/* Select MAX7219 chip (locking the SPI bus in case there are multiple
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* devices competing for the SPI bus
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*/
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SPI_LOCK(spi, true);
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SPI_SELECT(spi, SPIDEV_DISPLAY(0), true);
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/* Now make sure that the SPI bus is configured for the MAX7219 (it
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* might have gotten configured for a different device while unlocked)
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*/
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SPI_SETMODE(spi, SPIDEV_MODE0);
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SPI_SETBITS(spi, 8);
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(void)SPI_HWFEATURES(spi, 0);
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(void)SPI_SETFREQUENCY(spi, CONFIG_MAX7219_FREQUENCY);
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}
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/****************************************************************************
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* Name: max7219_deselect
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*
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* Description:
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* De-select the SPI
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*
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* Parameters:
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* spi - Reference to the SPI driver structure
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void max7219_deselect(FAR struct spi_dev_s *spi)
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{
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/* De-select MAX7219 chip and relinquish the SPI bus. */
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SPI_SELECT(spi, SPIDEV_DISPLAY(0), false);
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SPI_LOCK(spi, false);
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}
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/****************************************************************************
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* Name: max7219_putrun
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*
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* Description:
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* This method can be used to write a partial raster line to the LCD:
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*
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* row - Starting row to write to (range: 0 <= row < yres)
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* col - Starting column to write to (range: 0 <= col <= xres-npixels)
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* buffer - The buffer containing the run to be written to the LCD
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* npixels - The number of pixels to write to the LCD
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* (range: 0 < npixels <= xres-col)
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*
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****************************************************************************/
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static int max7219_putrun(fb_coord_t row, fb_coord_t col,
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FAR const uint8_t *buffer, size_t npixels)
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{
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/* Because of this line of code, we will only be able to support a single
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* MAX7219 device .
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*/
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FAR struct max7219_dev_s *priv = &g_max7219dev;
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FAR uint8_t *fbptr;
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FAR uint8_t *ptr;
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uint16_t data;
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uint8_t usrmask;
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int i;
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int pixlen;
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ginfo("row: %d col: %d npixels: %d\n", row, col, npixels);
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DEBUGASSERT(buffer);
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/* Clip the run to the display */
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pixlen = npixels;
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if ((unsigned int)col + (unsigned int)pixlen > (unsigned int)MAX7219_XRES)
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{
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pixlen = (int)MAX7219_XRES - (int)col;
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}
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/* Verify that some portion of the run remains on the display */
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if (pixlen <= 0 || row > MAX7219_YRES)
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{
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return OK;
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}
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#ifdef CONFIG_NX_PACKEDMSFIRST
|
||||
usrmask = MS_BIT;
|
||||
#else
|
||||
usrmask = LS_BIT;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_NX_PACKEDMSFIRST
|
||||
usrmask = MS_BIT;
|
||||
#else
|
||||
usrmask = LS_BIT;
|
||||
#endif
|
||||
|
||||
fbptr = &priv->fb[row * MAX7219_XSTRIDE];
|
||||
ptr = fbptr + (col >> 3);
|
||||
|
||||
for (i = 0; i < pixlen; i++)
|
||||
{
|
||||
if ((*buffer & usrmask) != 0)
|
||||
{
|
||||
__set_bit(col % 8 + i, ptr);
|
||||
}
|
||||
else
|
||||
{
|
||||
__clear_bit(col % 8 + i, ptr);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NX_PACKEDMSFIRST
|
||||
if (usrmask == LS_BIT)
|
||||
{
|
||||
buffer++;
|
||||
usrmask = MS_BIT;
|
||||
}
|
||||
else
|
||||
{
|
||||
usrmask >>= 1;
|
||||
}
|
||||
#else
|
||||
if (usrmask == MS_BIT)
|
||||
{
|
||||
buffer++;
|
||||
usrmask = LS_BIT;
|
||||
}
|
||||
else
|
||||
{
|
||||
usrmask <<= 1;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Lock and select the device */
|
||||
|
||||
max7219_select(priv->spi);
|
||||
|
||||
/* We need to send last row/column first to avoid mirror image */
|
||||
|
||||
for (i = MAX7219_XSTRIDE; i >= 0; i--)
|
||||
{
|
||||
/* Setup the row data */
|
||||
|
||||
data = (8 - row) | (*(fbptr + i) << 8);
|
||||
|
||||
/* Then transfer all 8 columns of data */
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
}
|
||||
|
||||
/* Unlock */
|
||||
|
||||
max7219_deselect(priv->spi);
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_getrun
|
||||
*
|
||||
* Description:
|
||||
* This method can be used to read a partial raster line from the LCD:
|
||||
*
|
||||
* row - Starting row to read from (range: 0 <= row < yres)
|
||||
* col - Starting column to read read (range: 0 <= col <= xres-npixels)
|
||||
* buffer - The buffer in which to return the run read from the LCD
|
||||
* npixels - The number of pixels to read from the LCD
|
||||
* (range: 0 < npixels <= xres-col)
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_getrun(fb_coord_t row, fb_coord_t col,
|
||||
FAR uint8_t *buffer, size_t npixels)
|
||||
{
|
||||
/* Because of this line of code, we will only be able to support a single
|
||||
* MAX7219 device.
|
||||
*/
|
||||
|
||||
FAR struct max7219_dev_s *priv = &g_max7219dev;
|
||||
FAR uint8_t *fbptr;
|
||||
FAR uint8_t *ptr;
|
||||
uint8_t usrmask;
|
||||
int i;
|
||||
int pixlen;
|
||||
|
||||
ginfo("row: %d col: %d npixels: %d\n", row, col, npixels);
|
||||
DEBUGASSERT(buffer);
|
||||
|
||||
/* Clip the run to the display */
|
||||
|
||||
pixlen = npixels;
|
||||
if ((unsigned int)col + (unsigned int)pixlen > (unsigned int)MAX7219_XRES)
|
||||
{
|
||||
pixlen = (int)MAX7219_XRES - (int)col;
|
||||
}
|
||||
|
||||
/* Verify that some portion of the run is actually the display */
|
||||
|
||||
if (pixlen <= 0 || row > MAX7219_YRES)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NX_PACKEDMSFIRST
|
||||
usrmask = MS_BIT;
|
||||
#else
|
||||
usrmask = LS_BIT;
|
||||
#endif
|
||||
|
||||
fbptr = &priv->fb[row * MAX7219_XSTRIDE];
|
||||
ptr = fbptr + (col >> 3);
|
||||
|
||||
for (i = 0; i < pixlen; i++)
|
||||
{
|
||||
if (__test_bit(col % 8 + i, ptr))
|
||||
{
|
||||
*buffer |= usrmask;
|
||||
}
|
||||
else
|
||||
{
|
||||
*buffer &= ~usrmask;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NX_PACKEDMSFIRST
|
||||
if (usrmask == LS_BIT)
|
||||
{
|
||||
buffer++;
|
||||
usrmask = MS_BIT;
|
||||
}
|
||||
else
|
||||
{
|
||||
usrmask >>= 1;
|
||||
}
|
||||
#else
|
||||
if (usrmask == MS_BIT)
|
||||
{
|
||||
buffer++;
|
||||
usrmask = LS_BIT;
|
||||
}
|
||||
else
|
||||
{
|
||||
usrmask <<= 1;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_getvideoinfo
|
||||
*
|
||||
* Description:
|
||||
* Get information about the LCD video controller configuration.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_getvideoinfo(FAR struct lcd_dev_s *dev,
|
||||
FAR struct fb_videoinfo_s *vinfo)
|
||||
{
|
||||
DEBUGASSERT(dev && vinfo);
|
||||
|
||||
ginfo("fmt: %d xres: %d yres: %d nplanes: %d\n",
|
||||
g_videoinfo.fmt, g_videoinfo.xres, g_videoinfo.yres,
|
||||
g_videoinfo.nplanes);
|
||||
|
||||
memcpy(vinfo, &g_videoinfo, sizeof(struct fb_videoinfo_s));
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_getplaneinfo
|
||||
*
|
||||
* Description:
|
||||
* Get information about the configuration of each LCD color plane.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
|
||||
FAR struct lcd_planeinfo_s *pinfo)
|
||||
{
|
||||
DEBUGASSERT(dev && pinfo && planeno == 0);
|
||||
|
||||
ginfo("planeno: %d bpp: %d\n", planeno, g_planeinfo.bpp);
|
||||
|
||||
memcpy(pinfo, &g_planeinfo, sizeof(struct lcd_planeinfo_s));
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_getpower
|
||||
*
|
||||
* Description:
|
||||
* Get the LCD panel power status (0: full off - CONFIG_LCD_MAXPOWER: full
|
||||
* on). On backlit LCDs, this setting may correspond to the backlight
|
||||
* setting.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_getpower(struct lcd_dev_s *dev)
|
||||
{
|
||||
struct max7219_dev_s *priv = (struct max7219_dev_s *)dev;
|
||||
|
||||
DEBUGASSERT(priv);
|
||||
ginfo("powered: %s\n", max7219_powerstring(priv->powered));
|
||||
|
||||
return priv->powered;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_setpower
|
||||
*
|
||||
* Description:
|
||||
* Enable/disable LCD panel power (0: full off - CONFIG_LCD_MAXPOWER: full on). On
|
||||
* backlit LCDs, this setting may correspond to the backlight setting.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_setpower(struct lcd_dev_s *dev, int power)
|
||||
{
|
||||
struct max7219_dev_s *priv = (struct max7219_dev_s *)dev;
|
||||
uint16_t data;
|
||||
|
||||
DEBUGASSERT(priv && (unsigned)power <= CONFIG_LCD_MAXPOWER);
|
||||
ginfo("power: %s powered: %s\n",
|
||||
max7219_powerstring(power), max7219_powerstring(priv->powered));
|
||||
|
||||
/* Select and lock the device */
|
||||
|
||||
max7219_select(priv->spi);
|
||||
|
||||
if (power <= MAX7219_POWER_OFF)
|
||||
{
|
||||
data = (MAX7219_SHUTDOWN) | (MAX7219_POWER_OFF << 8);
|
||||
|
||||
/* Turn the display off (power-down) */
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
priv->powered = MAX7219_POWER_OFF;
|
||||
}
|
||||
else
|
||||
{
|
||||
data = (MAX7219_SHUTDOWN) | (MAX7219_POWER_ON << 8);
|
||||
|
||||
/* Leave the power-down */
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
priv->powered = MAX7219_POWER_ON;
|
||||
}
|
||||
|
||||
/* Let go of the SPI lock and de-select the device */
|
||||
|
||||
max7219_deselect(priv->spi);
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_getcontrast
|
||||
*
|
||||
* Description:
|
||||
* Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_getcontrast(struct lcd_dev_s *dev)
|
||||
{
|
||||
struct max7219_dev_s *priv = (struct max7219_dev_s *)dev;
|
||||
|
||||
DEBUGASSERT(priv);
|
||||
return (int)priv->contrast;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_setcontrast
|
||||
*
|
||||
* Description:
|
||||
* Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int max7219_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
|
||||
{
|
||||
struct max7219_dev_s *priv = (struct max7219_dev_s *)dev;
|
||||
uint16_t data;
|
||||
|
||||
ginfo("contrast: %d\n", contrast);
|
||||
DEBUGASSERT(priv);
|
||||
|
||||
if (contrast > 15)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Save the contrast */
|
||||
|
||||
priv->contrast = contrast;
|
||||
|
||||
/* Select and lock the device */
|
||||
|
||||
max7219_select(priv->spi);
|
||||
|
||||
/* Configure the contrast/intensity */
|
||||
|
||||
data = (MAX7219_INTENSITY) | (DISPLAY_INTENSITY(contrast) << 8);
|
||||
|
||||
/* Set the contrast */
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
/* Let go of the SPI lock and de-select the device */
|
||||
|
||||
max7219_deselect(priv->spi);
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: up_clear
|
||||
*
|
||||
* Description:
|
||||
* Clear the display.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static inline void up_clear(FAR struct max7219_dev_s *priv)
|
||||
{
|
||||
FAR struct spi_dev_s *spi = priv->spi;
|
||||
uint16_t data;
|
||||
int row;
|
||||
int i;
|
||||
|
||||
/* Clear the framebuffer */
|
||||
|
||||
memset(priv->fb, MAX7219_BLACK, MAX7219_FBSIZE);
|
||||
|
||||
/* Go throw max7219 all 8 rows */
|
||||
|
||||
for (row = 0, i = 0; i < 8; i++)
|
||||
{
|
||||
/* Select and lock the device */
|
||||
|
||||
max7219_select(priv->spi);
|
||||
|
||||
/* Setup the row data */
|
||||
|
||||
data = (row + 1) | (priv->fb[row] << 8);
|
||||
|
||||
/* Then transfer all 8 columns of data */
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
/* Unlock and de-select the device */
|
||||
|
||||
max7219_deselect(spi);
|
||||
}
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the MAX7219 device as a LCD interface.
|
||||
*
|
||||
* Input Parameters:
|
||||
* spi - An instance of the SPI interface to use to communicate
|
||||
* with the MAX7219.
|
||||
* devno - Device number to identify current display.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero (OK) on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct lcd_dev_s *max7219_initialize(FAR struct spi_dev_s *spi,
|
||||
unsigned int devno)
|
||||
{
|
||||
/* Configure and enable LCD */
|
||||
|
||||
FAR struct max7219_dev_s *priv = &g_max7219dev;
|
||||
uint16_t data;
|
||||
|
||||
ginfo("Initializing\n");
|
||||
DEBUGASSERT(spi && devno == 0);
|
||||
|
||||
/* Save the reference to the SPI device */
|
||||
|
||||
priv->spi = spi;
|
||||
|
||||
/* Select and lock the device */
|
||||
|
||||
max7219_select(spi);
|
||||
|
||||
/* Leave the shutdown mode */
|
||||
|
||||
data = (MAX7219_SHUTDOWN) | (MAX7219_POWER_ON << 8);
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
max7219_deselect(spi);
|
||||
|
||||
max7219_select(spi);
|
||||
|
||||
/* Disable 7 segment decoding */
|
||||
|
||||
data = (MAX7219_DECODE_MODE) | (DISABLE_DECODE << 8);
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
max7219_deselect(spi);
|
||||
|
||||
max7219_select(spi);
|
||||
|
||||
/* Set scan limit for all digits */
|
||||
|
||||
data = (MAX7219_SCAN_LIMIT) | (DEFAULT_SCAN_LIMIT << 8);
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
max7219_deselect(spi);
|
||||
|
||||
max7219_select(spi);
|
||||
|
||||
/* Set intensity level configured by the user */
|
||||
|
||||
data = (MAX7219_INTENSITY) | (DISPLAY_INTENSITY(CONFIG_LCD_MAXCONTRAST) << 8);
|
||||
|
||||
(void)SPI_SNDBLOCK(priv->spi, &data, 2);
|
||||
|
||||
/* Let go of the SPI lock and de-select the device */
|
||||
|
||||
max7219_deselect(spi);
|
||||
|
||||
/* Clear the framebuffer */
|
||||
|
||||
up_clear(priv);
|
||||
return &priv->dev;
|
||||
}
|
||||
128
include/nuttx/lcd/max7219.h
Normal file
128
include/nuttx/lcd/max7219.h
Normal file
@ -0,0 +1,128 @@
|
||||
/****************************************************************************
|
||||
* include/nuttx/lcd/max7219.h
|
||||
*
|
||||
* Copyright (C) 2017 Alan Carvalho de Assis. All rights reserved.
|
||||
* Author: Alan Carvalho de Assis <acassis@gmail.com>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef __INCLUDE_NUTTX_LCD_MAX7219_H
|
||||
#define __INCLUDE_NUTTX_LCD_MAX7219_H
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
#include <nuttx/fs/ioctl.h>
|
||||
|
||||
/* Configuration
|
||||
* CONFIG_SPI - Enables support for SPI drivers
|
||||
* CONFIG_LCD_MAX7219 - Enables support for the MAX7219 driver
|
||||
*/
|
||||
|
||||
#if defined(CONFIG_SPI) && defined(CONFIG_LCD_MAX7219)
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
/* MAX7219 register addresses */
|
||||
|
||||
#define MAX7219_NOOP (0x00) /* No Operation */
|
||||
#define MAX7219_DIGIT0 (0x01) /* Digit 0 register */
|
||||
#define MAX7219_DIGIT1 (0x02) /* Digit 1 register */
|
||||
#define MAX7219_DIGIT2 (0x03) /* Digit 2 register */
|
||||
#define MAX7219_DIGIT3 (0x04) /* Digit 3 register */
|
||||
#define MAX7219_DIGIT4 (0x05) /* Digit 4 register */
|
||||
#define MAX7219_DIGIT5 (0x06) /* Digit 5 register */
|
||||
#define MAX7219_DIGIT6 (0x07) /* Digit 6 register */
|
||||
#define MAX7219_DIGIT7 (0x08) /* Digit 7 register */
|
||||
#define MAX7219_DECODE_MODE (0x09) /* Decode Moder register */
|
||||
#define MAX7219_INTENSITY (0x0a) /* Intensity register */
|
||||
#define MAX7219_SCAN_LIMIT (0x0b) /* Scan Limit register */
|
||||
#define MAX7219_SHUTDOWN (0x0c) /* Shutdown register */
|
||||
#define MAX7219_DISPLAY_TEST (0x0f) /* Display Test register */
|
||||
|
||||
/* Default register values */
|
||||
|
||||
#define DISABLE_DECODE (0x00) /* Disable 7-seg decode */
|
||||
#define DEFAULT_SCAN_LIMIT (0x07) /* Display all digits */
|
||||
#define DISPLAY_INTENSITY(n) (n & 0xf) /* low nimble defines it */
|
||||
|
||||
/* Some important "colors" */
|
||||
|
||||
#define MAX7219_BLACK 0
|
||||
#define MAX7219_WHITE 1
|
||||
|
||||
/* Only two power settings are supported: */
|
||||
|
||||
#define MAX7219_POWER_OFF 0
|
||||
#define MAX7219_POWER_ON 1
|
||||
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
#define EXTERN extern "C"
|
||||
extern "C"
|
||||
{
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: max7219_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the MAX7219 device as a LCD interface.
|
||||
*
|
||||
* Input Parameters:
|
||||
* spi - An instance of the SPI interface to use to communicate
|
||||
* with the MAX7219.
|
||||
* devno - Device number to identify current display.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero (OK) on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct lcd_dev_s *max7219_initialize(FAR struct spi_dev_s *spi,
|
||||
unsigned int devno);
|
||||
|
||||
#undef EXTERN
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* CONFIG_SPI && CONFIG_MAX7219 */
|
||||
#endif /* __INCLUDE_NUTTX_LCD_MAX7219_H */
|
||||
Loading…
Reference in New Issue
Block a user