1002 lines
28 KiB
C
1002 lines
28 KiB
C
/**************************************************************************************
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* drivers/lcd/pcd8544.c
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*
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* Driver for the Philips PCD8544 Display controller
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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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* Based on drivers/lcd/pcd8544.c.
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*
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* Copyright (C) 2013 Zilogic Systems. All rights reserved.
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* Author: Manikandan <code@zilogic.com>
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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/pcd8544.h>
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#include "pcd8544.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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/* PCD8544 Configuration Settings:
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*
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* CONFIG_PCD8544_SPIMODE - Controls the SPI mode
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* CONFIG_PCD8544_FREQUENCY - Define to use a different bus frequency
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* CONFIG_PCD8544_NINTERFACES - Specifies the number of physical
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* PCD8544 devices that will be supported. NOTE: At present, this
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* must be undefined or defined to be 1.
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* CONFIG_LCD_PCD8544DEBUG - Enable detailed PCD8544 debug pcd8544 output
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* (CONFIG_DEBUG_FEATURES and CONFIG_VERBOSE must also be enabled).
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*
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* Required LCD driver settings:
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* CONFIG_LCD_PCD8544 - Enable PCD8544 support
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* CONFIG_LCD_MAXCONTRAST should be 255, but any value >0 and <=255 will be accepted.
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* CONFIG_LCD_MAXPOWER should be 1: 0=off, 1=normal
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*
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* Required SPI driver settings:
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* CONFIG_SPI_CMDDATA - Include support for cmd/data selection.
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*/
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/* Verify that all configuration requirements have been met */
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#ifndef CONFIG_PCD8544_SPIMODE
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# define CONFIG_PCD8544_SPIMODE SPIDEV_MODE0
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#endif
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/* SPI frequency */
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#ifndef CONFIG_PCD8544_FREQUENCY
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# define CONFIG_PCD8544_FREQUENCY 3000000
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#endif
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/* CONFIG_PCD8544_NINTERFACES determines the number of physical interfaces
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* that will be supported.
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*/
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#ifndef CONFIG_PCD8544_NINTERFACES
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# define CONFIG_PCD8544_NINTERFACES 1
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#endif
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#if CONFIG_PCD8544_NINTERFACES != 1
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# warning "Only a single PCD8544 interface is supported"
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# undef CONFIG_PCD8544_NINTERFACES
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# define CONFIG_PCD8544_NINTERFACES 1
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#endif
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/* Verbose debug pcd8544 must also be enabled to use the extra OLED debug pcd8544 */
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#ifndef CONFIG_DEBUG_FEATURES
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# undef CONFIG_DEBUG_INFO
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# undef CONFIG_DEBUG_GRAPHICS
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#endif
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#ifndef CONFIG_DEBUG_INFO
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# undef CONFIG_LCD_PCD8544DEBUG
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#endif
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/* Check contrast selection */
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#ifndef CONFIG_LCD_MAXCONTRAST
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# define CONFIG_LCD_MAXCONTRAST 127
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#endif
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#if CONFIG_LCD_MAXCONTRAST <= 0 || CONFIG_LCD_MAXCONTRAST > 127
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# error "CONFIG_LCD_MAXCONTRAST exceeds supported maximum"
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#endif
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#if CONFIG_LCD_MAXCONTRAST < 60
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# warning "Optimal setting of CONFIG_LCD_MAXCONTRAST is 60"
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#endif
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/* Check power setting */
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#if !defined(CONFIG_LCD_MAXPOWER)
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# define CONFIG_LCD_MAXPOWER 1
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#endif
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#if CONFIG_LCD_MAXPOWER != 1
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# warning "CONFIG_LCD_MAXPOWER should be 1"
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# undef CONFIG_LCD_MAXPOWER
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# define CONFIG_LCD_MAXPOWER 1
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#endif
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/* The Display requires CMD/DATA SPI support */
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#ifndef CONFIG_SPI_CMDDATA
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# error "CONFIG_SPI_CMDDATA must be defined in your NuttX configuration"
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#endif
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/* Color Properties *******************************************************************/
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/* The PCD8544 display controller can handle a resolution of 84x48.
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*/
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/* Display Resolution */
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#ifdef CONFIG_PCD8544_XRES
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#define PCD8544_XRES CONFIG_PCD8544_XRES
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#else
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#define PCD8544_XRES 84
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#endif
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#ifdef CONFIG_PCD8544_YRES
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#define PCD8544_YRES CONFIG_PCD8544_YRES
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#else
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#define PCD8544_YRES 48
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#endif
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/* Color depth and format */
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#define PCD8544_BPP 1
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#define PCD8544_COLORFMT FB_FMT_Y1
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/* Bytes per logical row and actual device row */
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#define PCD8544_XSTRIDE (PCD8544_XRES >> 3) /* Pixels arrange "horizontally for user" */
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#define PCD8544_YSTRIDE (PCD8544_YRES >> 3) /* But actual device arrangement is "vertical" */
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/* The size of the shadow frame buffer */
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#define PCD8544_FBSIZE (PCD8544_XRES * PCD8544_YSTRIDE)
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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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/**************************************************************************************
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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 pcd8544_dev_s
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{
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/* Publicly 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 PCD8544 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[PCD8544_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 pcd8544_select(FAR struct spi_dev_s *spi);
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static void pcd8544_deselect(FAR struct spi_dev_s *spi);
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/* LCD Data Transfer Methods */
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static int pcd8544_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer,
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size_t npixels);
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static int pcd8544_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
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size_t npixels);
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/* LCD Configuration */
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static int pcd8544_getvideoinfo(FAR struct lcd_dev_s *dev,
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FAR struct fb_videoinfo_s *vinfo);
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static int pcd8544_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
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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 pcd8544_getpower(struct lcd_dev_s *dev);
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static int pcd8544_setpower(struct lcd_dev_s *dev, int power);
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static int pcd8544_getcontrast(struct lcd_dev_s *dev);
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static int pcd8544_setcontrast(struct lcd_dev_s *dev, unsigned int contrast);
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/* Initialization */
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static inline void up_clear(FAR struct pcd8544_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[PCD8544_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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PCD8544_COLORFMT, /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */
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PCD8544_XRES, /* Horizontal resolution in pixel columns */
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PCD8544_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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pcd8544_putrun, /* Put a run into LCD memory */
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pcd8544_getrun, /* Get a run from LCD memory */
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(FAR uint8_t *)g_runbuffer, /* Run scratch buffer */
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PCD8544_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 pcd8544_dev_s g_pcd8544dev =
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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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pcd8544_getvideoinfo,
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pcd8544_getplaneinfo,
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/* LCD RGB Mapping -- Not supported */
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#ifdef CONFIG_FB_CMAP
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NULL,
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NULL,
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#endif
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/* Cursor Controls -- Not supported */
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#ifdef CONFIG_FB_HWCURSOR
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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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pcd8544_getpower,
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pcd8544_setpower,
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pcd8544_getcontrast,
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pcd8544_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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* Name: pcd8544_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 *pcd8544_powerstring(uint8_t power)
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{
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if (power == PCD8544_POWER_OFF)
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{
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return "OFF";
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}
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else if (power == PCD8544_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: pcd8544_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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* Input 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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* Assumptions:
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*
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**************************************************************************************/
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static void pcd8544_select(FAR struct spi_dev_s *spi)
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{
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/* Select PCD8544 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 PCD8544 (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, CONFIG_PCD8544_SPIMODE);
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SPI_SETBITS(spi, 8);
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SPI_HWFEATURES(spi, 0);
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SPI_SETFREQUENCY(spi, CONFIG_PCD8544_FREQUENCY);
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}
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/**************************************************************************************
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* Name: pcd8544_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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* Input 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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* Assumptions:
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*
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**************************************************************************************/
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static void pcd8544_deselect(FAR struct spi_dev_s *spi)
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{
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/* De-select PCD8544 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: pcd8544_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 pcd8544_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer,
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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 PCD8544 device */
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FAR struct pcd8544_dev_s *priv = &g_pcd8544dev;
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FAR uint8_t *fbptr;
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FAR uint8_t *ptr;
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uint8_t fbmask;
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uint8_t page;
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uint8_t usrmask;
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uint8_t 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)PCD8544_XRES)
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{
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pixlen = (int)PCD8544_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 > PCD8544_YRES)
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{
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return OK;
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}
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/* Get the page number. The range of 48 lines is divided up into six
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* pages of 8 lines each.
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*/
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page = row >> 3;
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/* Update the shadow frame buffer memory. First determine the pixel
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* position in the frame buffer memory. Pixels are organized like
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* this:
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*
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* --------+---+---+---+---+-...-+----+
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* Segment | 0 | 1 | 2 | 3 | ... | 83 |
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* --------+---+---+---+---+-...-+----+
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* Bit 0 | | X | | | | |
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* Bit 1 | | X | | | | |
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* Bit 2 | | X | | | | |
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* Bit 3 | | X | | | | |
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* Bit 4 | | X | | | | |
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* Bit 5 | | X | | | | |
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* Bit 6 | | X | | | | |
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* Bit 7 | | X | | | | |
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* --------+---+---+---+---+-...-+----+
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*
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* So, in order to draw a white, horizontal line, at row 45. we
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* would have to modify all of the bytes in page 45/8 = 5. We
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* would have to set bit 45%8 = 5 in every byte in the page.
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*/
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fbmask = 1 << (row & 7);
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fbptr = &priv->fb[page * PCD8544_XRES + col];
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ptr = fbptr;
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#ifdef CONFIG_LCD_PACKEDMSFIRST
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usrmask = MS_BIT;
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#else
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usrmask = LS_BIT;
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#endif
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for (i = 0; i < pixlen; i++)
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{
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/* Set or clear the corresponding bit */
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if ((*buffer & usrmask) != 0)
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{
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*ptr++ |= fbmask;
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}
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else
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{
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*ptr++ &= ~fbmask;
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}
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/* Inc/Decrement to the next source pixel */
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#ifdef CONFIG_LCD_PACKEDMSFIRST
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if (usrmask == LS_BIT)
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{
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buffer++;
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usrmask = MS_BIT;
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}
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else
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{
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usrmask >>= 1;
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}
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#else
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if (usrmask == MS_BIT)
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{
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buffer++;
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usrmask = LS_BIT;
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}
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else
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{
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usrmask <<= 1;
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}
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#endif
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}
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/* Select and lock the device */
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|
|
pcd8544_select(priv->spi);
|
|
|
|
/* Select command transfer */
|
|
|
|
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), true);
|
|
|
|
/* Set the starting position for the run */
|
|
|
|
SPI_SEND(priv->spi, PCD8544_SET_Y_ADDR+page); /* Set the page start */
|
|
SPI_SEND(priv->spi, PCD8544_SET_X_ADDR + (col & 0x7f)); /* Set the low column */
|
|
|
|
/* Select data transfer */
|
|
|
|
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), false);
|
|
|
|
/* Then transfer all of the data */
|
|
|
|
SPI_SNDBLOCK(priv->spi, fbptr, pixlen);
|
|
|
|
/* Unlock and de-select the device */
|
|
|
|
pcd8544_deselect(priv->spi);
|
|
return OK;
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Name: pcd8544_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 pcd8544_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 PCD8544 device */
|
|
|
|
FAR struct pcd8544_dev_s *priv = &g_pcd8544dev;
|
|
FAR uint8_t *fbptr;
|
|
uint8_t page;
|
|
uint8_t fbmask;
|
|
uint8_t usrmask;
|
|
uint8_t 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)PCD8544_XRES)
|
|
{
|
|
pixlen = (int)PCD8544_XRES - (int)col;
|
|
}
|
|
|
|
/* Verify that some portion of the run is actually the display */
|
|
|
|
if (pixlen <= 0 || row > PCD8544_YRES)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Then transfer the display data from the shadow frame buffer memory */
|
|
/* Get the page number. The range of 48 lines is divided up into six
|
|
* pages of 8 lines each.
|
|
*/
|
|
|
|
page = row >> 3;
|
|
|
|
/* Update the shadow frame buffer memory. First determine the pixel
|
|
* position in the frame buffer memory. Pixels are organized like
|
|
* this:
|
|
*
|
|
* --------+---+---+---+---+-...-+----+
|
|
* Segment | 0 | 1 | 2 | 3 | ... | 83 |
|
|
* --------+---+---+---+---+-...-+----+
|
|
* Bit 0 | | X | | | | |
|
|
* Bit 1 | | X | | | | |
|
|
* Bit 2 | | X | | | | |
|
|
* Bit 3 | | X | | | | |
|
|
* Bit 4 | | X | | | | |
|
|
* Bit 5 | | X | | | | |
|
|
* Bit 6 | | X | | | | |
|
|
* Bit 7 | | X | | | | |
|
|
* --------+---+---+---+---+-...-+----+
|
|
*
|
|
* So, in order to draw a white, horizontal line, at row 45. we
|
|
* would have to modify all of the bytes in page 45/8 = 5. We
|
|
* would have to set bit 45%8 = 5 in every byte in the page.
|
|
*/
|
|
|
|
fbmask = 1 << (row & 7);
|
|
fbptr = &priv->fb[page * PCD8544_XRES + col];
|
|
#ifdef CONFIG_LCD_PACKEDMSFIRST
|
|
usrmask = MS_BIT;
|
|
#else
|
|
usrmask = LS_BIT;
|
|
#endif
|
|
|
|
*buffer = 0;
|
|
for (i = 0; i < pixlen; i++)
|
|
{
|
|
/* Set or clear the corresponding bit */
|
|
|
|
uint8_t byte = *fbptr++;
|
|
if ((byte & fbmask) != 0)
|
|
{
|
|
*buffer |= usrmask;
|
|
}
|
|
|
|
/* Inc/Decrement to the next destination pixel. Hmmmm. It looks like
|
|
* this logic could write past the end of the user buffer. Revisit
|
|
* this!
|
|
*/
|
|
|
|
#ifdef CONFIG_LCD_PACKEDMSFIRST
|
|
if (usrmask == LS_BIT)
|
|
{
|
|
buffer++;
|
|
*buffer = 0;
|
|
usrmask = MS_BIT;
|
|
}
|
|
else
|
|
{
|
|
usrmask >>= 1;
|
|
}
|
|
#else
|
|
if (usrmask == MS_BIT)
|
|
{
|
|
buffer++;
|
|
*buffer = 0;
|
|
usrmask = LS_BIT;
|
|
}
|
|
else
|
|
{
|
|
usrmask <<= 1;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Name: pcd8544_getvideoinfo
|
|
*
|
|
* Description:
|
|
* Get information about the LCD video controller configuration.
|
|
*
|
|
**************************************************************************************/
|
|
|
|
static int pcd8544_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: pcd8544_getplaneinfo
|
|
*
|
|
* Description:
|
|
* Get information about the configuration of each LCD color plane.
|
|
*
|
|
**************************************************************************************/
|
|
|
|
static int pcd8544_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: pcd8544_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 pcd8544_getpower(struct lcd_dev_s *dev)
|
|
{
|
|
struct pcd8544_dev_s *priv = (struct pcd8544_dev_s *)dev;
|
|
DEBUGASSERT(priv);
|
|
ginfo("powered: %s\n", pcd8544_powerstring(priv->powered));
|
|
return priv->powered;
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Name: pcd8544_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 pcd8544_setpower(struct lcd_dev_s *dev, int power)
|
|
{
|
|
struct pcd8544_dev_s *priv = (struct pcd8544_dev_s *)dev;
|
|
|
|
DEBUGASSERT(priv && (unsigned)power <= CONFIG_LCD_MAXPOWER);
|
|
ginfo("power: %s powered: %s\n",
|
|
pcd8544_powerstring(power), pcd8544_powerstring(priv->powered));
|
|
|
|
/* Select and lock the device */
|
|
|
|
pcd8544_select(priv->spi);
|
|
|
|
/* Select command transfer */
|
|
|
|
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), true);
|
|
|
|
if (power <= PCD8544_POWER_OFF)
|
|
{
|
|
/* Turn the display off (power-down) */
|
|
|
|
SPI_SEND(priv->spi, (PCD8544_FUNC_SET | PCD8544_POWER_DOWN));
|
|
|
|
priv->powered = PCD8544_POWER_OFF;
|
|
}
|
|
else
|
|
{
|
|
/* Leave the power-down */
|
|
|
|
SPI_SEND(priv->spi, PCD8544_FUNC_SET);
|
|
|
|
priv->powered = PCD8544_POWER_ON;
|
|
}
|
|
|
|
/* Select data transfer */
|
|
|
|
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), false);
|
|
|
|
/* Let go of the SPI lock and de-select the device */
|
|
|
|
pcd8544_deselect(priv->spi);
|
|
|
|
return OK;
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Name: pcd8544_getcontrast
|
|
*
|
|
* Description:
|
|
* Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
|
|
*
|
|
**************************************************************************************/
|
|
|
|
static int pcd8544_getcontrast(struct lcd_dev_s *dev)
|
|
{
|
|
struct pcd8544_dev_s *priv = (struct pcd8544_dev_s *)dev;
|
|
DEBUGASSERT(priv);
|
|
return (int)priv->contrast;
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Name: pcd8544_setcontrast
|
|
*
|
|
* Description:
|
|
* Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
|
|
*
|
|
**************************************************************************************/
|
|
|
|
static int pcd8544_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
|
|
{
|
|
struct pcd8544_dev_s *priv = (struct pcd8544_dev_s *)dev;
|
|
|
|
ginfo("contrast: %d\n", contrast);
|
|
DEBUGASSERT(priv);
|
|
|
|
if (contrast > 127)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Save the contrast */
|
|
|
|
priv->contrast = contrast;
|
|
|
|
/* Select and lock the device */
|
|
|
|
pcd8544_select(priv->spi);
|
|
|
|
/* Select command transfer */
|
|
|
|
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), true);
|
|
|
|
/* Select the extended instruction set ( H = 1 ) */
|
|
|
|
SPI_SEND(priv->spi, (PCD8544_FUNC_SET | PCD8544_MODEH));
|
|
|
|
/* Set the contrast */
|
|
|
|
SPI_SEND(priv->spi, (PCD8544_WRITE_VOP | contrast) );
|
|
|
|
/* Return to normal mode */
|
|
|
|
SPI_SEND(priv->spi, PCD8544_FUNC_SET);
|
|
|
|
/* Select data transfer */
|
|
|
|
SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), false);
|
|
|
|
/* Let go of the SPI lock and de-select the device */
|
|
|
|
pcd8544_deselect(priv->spi);
|
|
|
|
return OK;
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Name: up_clear
|
|
*
|
|
* Description:
|
|
* Clear the display.
|
|
*
|
|
**************************************************************************************/
|
|
|
|
static inline void up_clear(FAR struct pcd8544_dev_s *priv)
|
|
{
|
|
FAR struct spi_dev_s *spi = priv->spi;
|
|
int page;
|
|
int i;
|
|
|
|
/* Clear the framebuffer */
|
|
|
|
memset(priv->fb, PCD8544_Y1_BLACK, PCD8544_FBSIZE);
|
|
|
|
/* Select and lock the device */
|
|
|
|
pcd8544_select(priv->spi);
|
|
|
|
/* Go throw pcd8544 all 6 pages */
|
|
|
|
for (page = 0, i = 0; i < 6; i++)
|
|
{
|
|
/* Select command transfer */
|
|
|
|
SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), true);
|
|
|
|
/* Set the starting position for the run */
|
|
|
|
SPI_SEND(priv->spi, PCD8544_SET_Y_ADDR+i); /* Set the page start */
|
|
SPI_SEND(priv->spi, PCD8544_SET_X_ADDR + page); /* Set the column */
|
|
|
|
|
|
/* Select data transfer */
|
|
|
|
SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), false);
|
|
|
|
/* Then transfer all 84 columns of data */
|
|
|
|
SPI_SNDBLOCK(priv->spi, &priv->fb[page * PCD8544_XRES], PCD8544_XRES);
|
|
}
|
|
|
|
/* Unlock and de-select the device */
|
|
|
|
pcd8544_deselect(spi);
|
|
}
|
|
|
|
/**************************************************************************************
|
|
* Public Functions
|
|
**************************************************************************************/
|
|
|
|
/**************************************************************************************
|
|
* Name: pcd8544_initialize
|
|
*
|
|
* Description:
|
|
* Initialize the PCD8544 video hardware. The initial state of the
|
|
* OLED is fully initialized, display memory cleared, and the OLED ready to
|
|
* use, but with the power setting at 0 (full off == sleep mode).
|
|
*
|
|
* Input Parameters:
|
|
*
|
|
* spi - A reference to the SPI driver instance.
|
|
* devno - A value in the range of 0 thropcd8544h CONFIG_PCD8544_NINTERFACES-1.
|
|
* This allows support for multiple OLED devices.
|
|
*
|
|
* Returned Value:
|
|
*
|
|
* On success, this function returns a reference to the LCD object for the specified
|
|
* OLED. NULL is returned on any failure.
|
|
*
|
|
**************************************************************************************/
|
|
|
|
FAR struct lcd_dev_s *pcd8544_initialize(FAR struct spi_dev_s *spi, unsigned int devno)
|
|
{
|
|
/* Configure and enable LCD */
|
|
|
|
FAR struct pcd8544_dev_s *priv = &g_pcd8544dev;
|
|
|
|
ginfo("Initializing\n");
|
|
DEBUGASSERT(spi && devno == 0);
|
|
|
|
/* Save the reference to the SPI device */
|
|
|
|
priv->spi = spi;
|
|
|
|
/* Select and lock the device */
|
|
|
|
pcd8544_select(spi);
|
|
|
|
/* Select command transfer */
|
|
|
|
SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), true);
|
|
|
|
/* Leave the power-down and select extended instruction set mode H = 1 */
|
|
|
|
SPI_SEND(spi, (PCD8544_FUNC_SET | PCD8544_MODEH));
|
|
|
|
/* Set LCD Bias to n = 3 */
|
|
|
|
SPI_SEND(spi, (PCD8544_BIAS_SYSTEM | PCD8544_BIAS_BS2));
|
|
|
|
/* Select the normal instruction set mode H = 0 */
|
|
|
|
SPI_SEND(spi, PCD8544_FUNC_SET);
|
|
|
|
/* Clear the screen */
|
|
|
|
SPI_SEND(spi, (PCD8544_DISP_CTRL | PCD8544_DISP_BLANK));
|
|
|
|
/* Set the Display Control to Normal Mode D = 1 and E = 0 */
|
|
|
|
SPI_SEND(spi, (PCD8544_DISP_CTRL | PCD8544_DISP_NORMAL));
|
|
|
|
/* Select data transfer */
|
|
|
|
SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), false);
|
|
|
|
/* Let go of the SPI lock and de-select the device */
|
|
|
|
pcd8544_deselect(spi);
|
|
|
|
/* Clear the framebuffer */
|
|
|
|
up_mdelay(100);
|
|
up_clear(priv);
|
|
return &priv->dev;
|
|
}
|