731 lines
21 KiB
C
731 lines
21 KiB
C
/****************************************************************************
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* drivers/lcd/memlcd.c
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* Driver for Sharp Memory LCD.
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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* Librae <librae8226@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 writen 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/memlcd.h>
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#include <arch/irq.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Bit order H/W feature must be enabled in order to support LSB first
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* operation.
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*/
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#if !defined(CONFIG_SPI_HWFEATURES) || !defined(CONFIG_SPI_BITORDER)
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# error CONFIG_SPI_HWFEATURES=y and CONFIG_SPI_BITORDER=y required by this driver
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#endif
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#ifndef CONFIG_ARCH_HAVE_SPI_BITORDER
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# warning This platform does not support SPI LSB-bit order
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#endif
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/* Cisplay resolution */
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#if defined CONFIG_MEMLCD_LS013B7DH01
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# define MEMLCD_XRES 144
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# define MEMLCD_YRES 168
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#elif defined CONFIG_MEMLCD_LS013B7DH03
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# define MEMLCD_XRES 128
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# define MEMLCD_YRES 128
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#else
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# error "This Memory LCD model is not supported yet."
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#endif
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/* lcd command */
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#define MEMLCD_CMD_UPDATE (0x01)
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#define MEMLCD_CMD_ALL_CLEAR (0x04)
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#define MEMLCD_CONTROL_BYTES (0)
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/* Dolor depth and format */
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#define MEMLCD_BPP 1
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#define MEMLCD_COLORFMT FB_FMT_Y1
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/* Bytes per logical row and column */
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#define MEMLCD_XSTRIDE (MEMLCD_XRES >> 3)
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#define MEMLCD_YSTRIDE (MEMLCD_YRES >> 3)
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/* display memory allocation */
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#define MEMLCD_FBSIZE (MEMLCD_XSTRIDE*MEMLCD_YRES)
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/* contrast setting, related to VCOM toggle frequency
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* higher frequency gives better contrast, instead, saves power
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*/
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#define MEMLCD_CONTRAST 24
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#define MEMLCD_MAXCONTRAST 60
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#define MEMLCD_MINCONTRAST 1
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/* Other misc settings */
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#define MEMLCD_SPI_FREQUENCY 2250000
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#define MEMLCD_SPI_BITS 8
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#define MEMLCD_SPI_MODE SPIDEV_MODE0
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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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struct memlcd_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; /* Cached SPI device reference */
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FAR struct memlcd_priv_s *priv; /* Board specific structure */
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uint8_t contrast; /* Current contrast setting */
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uint8_t power; /* Current power setting */
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/* The memlcds does not support reading the display memory in SPI mode.
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* Since there is 1 BPP and is byte access, it is necessary to keep a
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* shadow copy of the framebuffer. At 128x128, it amounts to 2KB.
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*/
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uint8_t fb[MEMLCD_FBSIZE];
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};
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/****************************************************************************
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* Private Function Protototypes
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****************************************************************************/
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/* Low-level spi helpers */
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static void memlcd_select(FAR struct spi_dev_s *spi);
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static void memlcd_deselect(FAR struct spi_dev_s *spi);
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/* lcd data transfer methods */
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static int memlcd_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 memlcd_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 memlcd_getvideoinfo(FAR struct lcd_dev_s *dev,
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FAR struct fb_videoinfo_s *vinfo);
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static int memlcd_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 specific controls */
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static int memlcd_getpower(struct lcd_dev_s *dev);
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static int memlcd_setpower(struct lcd_dev_s *dev, int power);
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static int memlcd_getcontrast(struct lcd_dev_s *dev);
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static int memlcd_setcontrast(struct lcd_dev_s *dev, unsigned int contrast);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static uint8_t g_runbuffer[MEMLCD_BPP * MEMLCD_XRES / 8];
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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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.fmt = MEMLCD_COLORFMT, /* Color format: rgb16-565: rrrr rggg gggb bbbb */
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.xres = MEMLCD_XRES, /* Horizontal resolution in pixel columns */
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.yres = MEMLCD_YRES, /* Vertical resolution in pixel rows */
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.nplanes = 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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.putrun = memlcd_putrun, /* Put a run into lcd memory */
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.getrun = memlcd_getrun, /* Get a run from lcd memory */
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.buffer = (uint8_t *) g_runbuffer, /* Run scratch buffer */
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.bpp = MEMLCD_BPP, /* Bits-per-pixel */
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};
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/* This is the oled driver instance (only a single device is supported for now) */
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static struct memlcd_dev_s g_memlcddev =
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{
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.dev =
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{
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/* lcd configuration */
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.getvideoinfo = memlcd_getvideoinfo,
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.getplaneinfo = memlcd_getplaneinfo,
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/* lcd specific controls */
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.getpower = memlcd_getpower,
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.setpower = memlcd_setpower,
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.getcontrast = memlcd_getcontrast,
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.setcontrast = memlcd_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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#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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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: memlcd_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 memlcd_select(FAR struct spi_dev_s *spi)
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{
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int ret;
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/* Select memlcd (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, true);
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/* Now make sure that the SPI bus is configured for the memlcd (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, MEMLCD_SPI_MODE);
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SPI_SETBITS(spi, MEMLCD_SPI_BITS);
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ret = SPI_HWFEATURES(spi, HWFEAT_LSBFIRST);
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if (ret < 0)
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{
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lcderr("ERROR: SPI_HWFEATURES failed to set bit order: %d\n", ret);
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}
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#ifdef CONFIG_MEMLCD_SPI_FREQUENCY
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(void)SPI_SETFREQUENCY(spi, CONFIG_MEMLCD_SPI_FREQUENCY);
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#else
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(void)SPI_SETFREQUENCY(spi, MEMLCD_SPI_FREQUENCY);
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#endif
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}
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/****************************************************************************
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* Name: memlcd_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 memlcd_deselect(FAR struct spi_dev_s *spi)
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{
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/* De-select memlcd and relinquish the spi bus. */
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SPI_SELECT(spi, SPIDEV_DISPLAY, false);
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SPI_LOCK(spi, false);
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}
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/****************************************************************************
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* Name: memlcd_clear
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*
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* Description:
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* This method can be used to clear the entire display.
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*
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* Input Parameters:
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* mlcd - Reference to private driver structure
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*
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* Assumptions:
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*
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****************************************************************************/
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static inline void memlcd_clear(FAR struct memlcd_dev_s *mlcd)
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{
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uint16_t cmd = MEMLCD_CMD_ALL_CLEAR;
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lcdinfo("Clear display\n");
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memlcd_select(mlcd->spi);
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/* XXX Ensure 2us here */
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SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
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/* XXX Ensure 6us here */
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memlcd_deselect(mlcd->spi);
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}
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/****************************************************************************
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* Name: memlcd_extcominisr
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*
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* Description:
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* This method enables/disables the polarity (VCOM) toggling behavior for
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* the Memory LCD. Which is always used within setpower() call.
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* Basically, the frequency shall be 1Hz~60Hz.
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* If use hardware mode to toggle VCOM, we need to send specific command at a
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* constant frequency to trigger the LCD intenal hardware logic.
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* While use software mode, we set up a timer to toggle EXTCOMIN connected IO,
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* basically, it is a hardware timer to ensure a constant frequency.
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*
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* Input Parameters:
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* mlcd - Reference to private driver structure
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*
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* Assumptions:
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* Board specific logic needs to be provided to support it.
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*
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****************************************************************************/
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static int memlcd_extcominisr(int irq, FAR void *context)
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{
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static bool pol = 0;
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struct memlcd_dev_s *mlcd = &g_memlcddev;
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#ifdef CONFIG_MEMLCD_EXTCOMIN_MODE_HW
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# error "CONFIG_MEMLCD_EXTCOMIN_MODE_HW unsupported yet!"
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/* Start a worker thread, do it in bottom half? */
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#else
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pol = !pol;
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mlcd->priv->setpolarity(pol);
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#endif
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return OK;
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}
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/****************************************************************************
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* Name: memlcd_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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* Input Parameters:
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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 writen 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 memlcd_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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FAR struct memlcd_dev_s *mlcd = (FAR struct memlcd_dev_s *)&g_memlcddev;
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uint16_t cmd;
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uint8_t *p;
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uint8_t *pfb;
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uint8_t usrmask;
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int i;
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DEBUGASSERT(buffer);
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lcdinfo("row: %d col: %d npixels: %d\n", row, col, npixels);
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#ifdef CONFIG_NX_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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pfb = &mlcd->fb[row * MEMLCD_XSTRIDE];
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p = pfb + (col >> 3);
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for (i = 0; i < npixels; i++)
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{
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if ((*buffer & usrmask) != 0)
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{
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__set_bit(col % 8 + i, p);
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}
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else
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{
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__clear_bit(col % 8 + i, p);
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}
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#ifdef CONFIG_NX_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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/* Need to adjust start row by one because Memory LCD starts counting
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* lines from 1, while the display interface starts from 0.
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*/
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row++;
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memlcd_select(mlcd->spi);
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/* XXX Ensure 6us here */
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cmd = MEMLCD_CMD_UPDATE | row << 8;
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SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
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SPI_SNDBLOCK(mlcd->spi, pfb, MEMLCD_YRES / 8 + MEMLCD_CONTROL_BYTES);
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cmd = 0xffff;
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SPI_SNDBLOCK(mlcd->spi, &cmd, 2);
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/* XXX Ensure 2us here */
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memlcd_deselect(mlcd->spi);
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return OK;
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}
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/****************************************************************************
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* Name: memlcd_getrun
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*
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* Description:
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* This method can be used to read a partial raster line from the LCD.
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*
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* row - Starting row to read from (range: 0 <= row < yres)
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* col - Starting column to read read (range: 0 <= col <= xres-npixels)
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* buffer - The buffer in which to return the run read from the LCD
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* npixels - The number of pixels to read from 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 memlcd_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t * buffer,
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size_t npixels)
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{
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FAR struct memlcd_dev_s *mlcd = (FAR struct memlcd_dev_s *)&g_memlcddev;
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uint8_t *p;
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uint8_t *pfb;
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uint8_t usrmask;
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int i;
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DEBUGASSERT(buffer);
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lcdinfo("row: %d col: %d npixels: %d\n", row, col, npixels);
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#ifdef CONFIG_NX_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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pfb = &mlcd->fb[row * MEMLCD_XSTRIDE];
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p = pfb + (col >> 3);
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for (i = 0; i < npixels; i++)
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{
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if (__test_bit(col % 8 + i, p))
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{
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*buffer |= usrmask;
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}
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else
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{
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*buffer &= ~usrmask;
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}
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#ifdef CONFIG_NX_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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}
|
|
#else
|
|
if (usrmask == MS_BIT)
|
|
{
|
|
buffer++;
|
|
usrmask = LS_BIT;
|
|
}
|
|
else
|
|
{
|
|
usrmask <<= 1;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: memlcd_getvideoinfo
|
|
*
|
|
* Description:
|
|
* Get information about the LCD video controller configuration.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int memlcd_getvideoinfo(FAR struct lcd_dev_s *dev,
|
|
FAR struct fb_videoinfo_s *vinfo)
|
|
{
|
|
DEBUGASSERT(dev && vinfo);
|
|
lcdinfo("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: memlcd_getplaneinfo
|
|
*
|
|
* Description:
|
|
* Get information about the configuration of each LCD color plane.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int memlcd_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
|
|
FAR struct lcd_planeinfo_s *pinfo)
|
|
{
|
|
DEBUGASSERT(pinfo && planeno == 0);
|
|
lcdinfo("planeno: %d bpp: %d\n", planeno, g_planeinfo.bpp);
|
|
memcpy(pinfo, &g_planeinfo, sizeof(struct lcd_planeinfo_s));
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: memlcd_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 memlcd_getpower(FAR struct lcd_dev_s *dev)
|
|
{
|
|
FAR struct memlcd_dev_s *mlcd = (FAR struct memlcd_dev_s *)dev;
|
|
|
|
DEBUGASSERT(mlcd);
|
|
lcdinfo("%d\n", mlcd->power);
|
|
return mlcd->power;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: memlcd_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 memlcd_setpower(FAR struct lcd_dev_s *dev, int power)
|
|
{
|
|
struct memlcd_dev_s *mlcd = (struct memlcd_dev_s *)dev;
|
|
|
|
DEBUGASSERT(mlcd && (unsigned)power <= CONFIG_LCD_MAXPOWER && mlcd->spi);
|
|
lcdinfo("%d\n", power);
|
|
mlcd->power = power;
|
|
|
|
if (power > 0)
|
|
{
|
|
mlcd->priv->dispcontrol(1);
|
|
memlcd_clear(mlcd);
|
|
}
|
|
else
|
|
{
|
|
mlcd->priv->dispcontrol(0);
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: memlcd_getcontrast
|
|
*
|
|
* Description:
|
|
* Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int memlcd_getcontrast(struct lcd_dev_s *dev)
|
|
{
|
|
struct memlcd_dev_s *mlcd = (struct memlcd_dev_s *)dev;
|
|
|
|
DEBUGASSERT(mlcd);
|
|
lcdinfo("contrast: %d\n", mlcd->contrast);
|
|
return mlcd->contrast;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: memlcd_setcontrast
|
|
*
|
|
* Description:
|
|
* Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int memlcd_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
|
|
{
|
|
struct memlcd_dev_s *mlcd = (struct memlcd_dev_s *)dev;
|
|
|
|
DEBUGASSERT(mlcd);
|
|
lcdinfo("contrast: %d\n", contrast);
|
|
if (contrast > MEMLCD_MAXCONTRAST)
|
|
{
|
|
contrast = MEMLCD_MAXCONTRAST;
|
|
}
|
|
|
|
if (contrast < MEMLCD_MINCONTRAST)
|
|
{
|
|
contrast = MEMLCD_MINCONTRAST;
|
|
}
|
|
|
|
mlcd->contrast = contrast;
|
|
mlcd->priv->setvcomfreq(contrast);
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: memlcd_initialize
|
|
*
|
|
* Description:
|
|
* Initialize the Sharp Memory LCD 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 through CONFIG_memlcd_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 LCD. NULL is returned on any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct lcd_dev_s *memlcd_initialize(FAR struct spi_dev_s *spi,
|
|
FAR struct memlcd_priv_s *priv,
|
|
unsigned int devno)
|
|
{
|
|
FAR struct memlcd_dev_s *mlcd = &g_memlcddev;
|
|
|
|
DEBUGASSERT(spi && priv && devno == 0);
|
|
|
|
/* Register board specific functions */
|
|
|
|
mlcd->priv = priv;
|
|
mlcd->spi = spi;
|
|
|
|
mlcd->priv->attachirq(memlcd_extcominisr);
|
|
|
|
lcdinfo("done\n");
|
|
return &mlcd->dev;
|
|
}
|