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- /**************************************************************************************
- * drivers/lcd/pcd8544.c
- *
- * Driver for the Philips PCD8544 Display controller
- *
- * Copyright (C) 2017 Alan Carvalho de Assis. All rights reserved.
- * Author: Alan Carvalho de Assis <acassis@gmail.com>
- *
- * Based on drivers/lcd/pcd8544.c.
- *
- * Copyright (C) 2013 Zilogic Systems. All rights reserved.
- * Author: Manikandan <code@zilogic.com>
- *
- * Copyright (C) 2011 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- **************************************************************************************/
- /**************************************************************************************
- * Included Files
- **************************************************************************************/
- #include <nuttx/config.h>
- #include <sys/types.h>
- #include <stdint.h>
- #include <stdbool.h>
- #include <string.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/arch.h>
- #include <nuttx/spi/spi.h>
- #include <nuttx/lcd/lcd.h>
- #include <nuttx/lcd/pcd8544.h>
- #include "pcd8544.h"
- /**************************************************************************************
- * Pre-processor Definitions
- **************************************************************************************/
- /* Configuration **********************************************************************/
- /* PCD8544 Configuration Settings:
- *
- * CONFIG_PCD8544_SPIMODE - Controls the SPI mode
- * CONFIG_PCD8544_FREQUENCY - Define to use a different bus frequency
- * CONFIG_PCD8544_NINTERFACES - Specifies the number of physical
- * PCD8544 devices that will be supported. NOTE: At present, this
- * must be undefined or defined to be 1.
- * CONFIG_LCD_PCD8544DEBUG - Enable detailed PCD8544 debug pcd8544 output
- * (CONFIG_DEBUG_FEATURES and CONFIG_VERBOSE must also be enabled).
- *
- * Required LCD driver settings:
- * CONFIG_LCD_PCD8544 - Enable PCD8544 support
- * CONFIG_LCD_MAXCONTRAST should be 255, but any value >0 and <=255 will be accepted.
- * CONFIG_LCD_MAXPOWER should be 1: 0=off, 1=normal
- *
- * Required SPI driver settings:
- * CONFIG_SPI_CMDDATA - Include support for cmd/data selection.
- */
- /* Verify that all configuration requirements have been met */
- #ifndef CONFIG_PCD8544_SPIMODE
- # define CONFIG_PCD8544_SPIMODE SPIDEV_MODE0
- #endif
- /* SPI frequency */
- #ifndef CONFIG_PCD8544_FREQUENCY
- # define CONFIG_PCD8544_FREQUENCY 3000000
- #endif
- /* CONFIG_PCD8544_NINTERFACES determines the number of physical interfaces
- * that will be supported.
- */
- #ifndef CONFIG_PCD8544_NINTERFACES
- # define CONFIG_PCD8544_NINTERFACES 1
- #endif
- #if CONFIG_PCD8544_NINTERFACES != 1
- # warning "Only a single PCD8544 interface is supported"
- # undef CONFIG_PCD8544_NINTERFACES
- # define CONFIG_PCD8544_NINTERFACES 1
- #endif
- /* Verbose debug pcd8544 must also be enabled to use the extra OLED debug pcd8544 */
- #ifndef CONFIG_DEBUG_FEATURES
- # undef CONFIG_DEBUG_INFO
- # undef CONFIG_DEBUG_GRAPHICS
- #endif
- #ifndef CONFIG_DEBUG_INFO
- # undef CONFIG_LCD_PCD8544DEBUG
- #endif
- /* Check contrast selection */
- #ifndef CONFIG_LCD_MAXCONTRAST
- # define CONFIG_LCD_MAXCONTRAST 127
- #endif
- #if CONFIG_LCD_MAXCONTRAST <= 0 || CONFIG_LCD_MAXCONTRAST > 127
- # error "CONFIG_LCD_MAXCONTRAST exceeds supported maximum"
- #endif
- #if CONFIG_LCD_MAXCONTRAST < 60
- # warning "Optimal setting of CONFIG_LCD_MAXCONTRAST is 60"
- #endif
- /* Check power setting */
- #if !defined(CONFIG_LCD_MAXPOWER)
- # define CONFIG_LCD_MAXPOWER 1
- #endif
- #if CONFIG_LCD_MAXPOWER != 1
- # warning "CONFIG_LCD_MAXPOWER should be 1"
- # undef CONFIG_LCD_MAXPOWER
- # define CONFIG_LCD_MAXPOWER 1
- #endif
- /* The Display requires CMD/DATA SPI support */
- #ifndef CONFIG_SPI_CMDDATA
- # error "CONFIG_SPI_CMDDATA must be defined in your NuttX configuration"
- #endif
- /* Color Properties *******************************************************************/
- /* The PCD8544 display controller can handle a resolution of 84x48.
- */
- /* Display Resolution */
- #ifdef CONFIG_PCD8544_XRES
- #define PCD8544_XRES CONFIG_PCD8544_XRES
- #else
- #define PCD8544_XRES 84
- #endif
- #ifdef CONFIG_PCD8544_YRES
- #define PCD8544_YRES CONFIG_PCD8544_YRES
- #else
- #define PCD8544_YRES 48
- #endif
- /* Color depth and format */
- #define PCD8544_BPP 1
- #define PCD8544_COLORFMT FB_FMT_Y1
- /* Bytes per logical row and actual device row */
- #define PCD8544_XSTRIDE (PCD8544_XRES >> 3) /* Pixels arrange "horizontally for user" */
- #define PCD8544_YSTRIDE (PCD8544_YRES >> 3) /* But actual device arrangement is "vertical" */
- /* The size of the shadow frame buffer */
- #define PCD8544_FBSIZE (PCD8544_XRES * PCD8544_YSTRIDE)
- /* Bit helpers */
- #define LS_BIT (1 << 0)
- #define MS_BIT (1 << 7)
- /**************************************************************************************
- * Private Type Definition
- **************************************************************************************/
- /* This structure describes the state of this driver */
- struct pcd8544_dev_s
- {
- /* Publically visible device structure */
- struct lcd_dev_s dev;
- /* Private LCD-specific information follows */
- FAR struct spi_dev_s *spi;
- uint8_t contrast;
- uint8_t powered;
- /* The PCD8544 does not support reading from the display memory in SPI mode.
- * Since there is 1 BPP and access is byte-by-byte, it is necessary to keep
- * a shadow copy of the framebuffer memory.
- */
- uint8_t fb[PCD8544_FBSIZE];
- };
- /**************************************************************************************
- * Private Function Protototypes
- **************************************************************************************/
- /* SPI helpers */
- static void pcd8544_select(FAR struct spi_dev_s *spi);
- static void pcd8544_deselect(FAR struct spi_dev_s *spi);
- /* LCD Data Transfer Methods */
- static int pcd8544_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer,
- size_t npixels);
- static int pcd8544_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
- size_t npixels);
- /* LCD Configuration */
- static int pcd8544_getvideoinfo(FAR struct lcd_dev_s *dev,
- FAR struct fb_videoinfo_s *vinfo);
- static int pcd8544_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
- FAR struct lcd_planeinfo_s *pinfo);
- /* LCD RGB Mapping */
- #ifdef CONFIG_FB_CMAP
- # error "RGB color mapping not supported by this driver"
- #endif
- /* Cursor Controls */
- #ifdef CONFIG_FB_HWCURSOR
- # error "Cursor control not supported by this driver"
- #endif
- /* LCD Specific Controls */
- static int pcd8544_getpower(struct lcd_dev_s *dev);
- static int pcd8544_setpower(struct lcd_dev_s *dev, int power);
- static int pcd8544_getcontrast(struct lcd_dev_s *dev);
- static int pcd8544_setcontrast(struct lcd_dev_s *dev, unsigned int contrast);
- /* Initialization */
- static inline void up_clear(FAR struct pcd8544_dev_s *priv);
- /**************************************************************************************
- * Private Data
- **************************************************************************************/
- /* This is working memory allocated by the LCD driver for each LCD device
- * and for each color plane. This memory will hold one raster line of data.
- * The size of the allocated run buffer must therefore be at least
- * (bpp * xres / 8). Actual alignment of the buffer must conform to the
- * bitwidth of the underlying pixel type.
- *
- * If there are multiple planes, they may share the same working buffer
- * because different planes will not be operate on concurrently. However,
- * if there are multiple LCD devices, they must each have unique run buffers.
- */
- static uint8_t g_runbuffer[PCD8544_XSTRIDE+1];
- /* This structure describes the overall LCD video controller */
- static const struct fb_videoinfo_s g_videoinfo =
- {
- PCD8544_COLORFMT, /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */
- PCD8544_XRES, /* Horizontal resolution in pixel columns */
- PCD8544_YRES, /* Vertical resolution in pixel rows */
- 1, /* Number of color planes supported */
- };
- /* This is the standard, NuttX Plane information object */
- static const struct lcd_planeinfo_s g_planeinfo =
- {
- pcd8544_putrun, /* Put a run into LCD memory */
- pcd8544_getrun, /* Get a run from LCD memory */
- (FAR uint8_t *)g_runbuffer, /* Run scratch buffer */
- PCD8544_BPP, /* Bits-per-pixel */
- };
- /* This is the standard, NuttX LCD driver object */
- static struct pcd8544_dev_s g_pcd8544dev =
- {
- /* struct lcd_dev_s */
- {
- /* LCD Configuration */
- pcd8544_getvideoinfo,
- pcd8544_getplaneinfo,
- /* LCD RGB Mapping -- Not supported */
- #ifdef CONFIG_FB_CMAP
- NULL,
- NULL,
- #endif
- /* Cursor Controls -- Not supported */
- #ifdef CONFIG_FB_HWCURSOR
- NULL,
- NULL,
- #endif
- /* LCD Specific Controls */
- pcd8544_getpower,
- pcd8544_setpower,
- pcd8544_getcontrast,
- pcd8544_setcontrast,
- },
- };
- /**************************************************************************************
- * Private Functions
- **************************************************************************************/
- /**************************************************************************************
- * Name: pcd8544_powerstring
- *
- * Description:
- * Convert the power setting to a string.
- *
- **************************************************************************************/
- static inline FAR const char *pcd8544_powerstring(uint8_t power)
- {
- if (power == PCD8544_POWER_OFF)
- {
- return "OFF";
- }
- else if (power == PCD8544_POWER_ON)
- {
- return "ON";
- }
- else
- {
- return "ERROR";
- }
- }
- /**************************************************************************************
- * Name: pcd8544_select
- *
- * Description:
- * Select the SPI, locking and re-configuring if necessary
- *
- * Input Parameters:
- * spi - Reference to the SPI driver structure
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- *
- **************************************************************************************/
- static void pcd8544_select(FAR struct spi_dev_s *spi)
- {
- /* Select PCD8544 chip (locking the SPI bus in case there are multiple
- * devices competing for the SPI bus
- */
- SPI_LOCK(spi, true);
- SPI_SELECT(spi, SPIDEV_DISPLAY(0), true);
- /* Now make sure that the SPI bus is configured for the PCD8544 (it
- * might have gotten configured for a different device while unlocked)
- */
- SPI_SETMODE(spi, CONFIG_PCD8544_SPIMODE);
- SPI_SETBITS(spi, 8);
- (void)SPI_HWFEATURES(spi, 0);
- (void)SPI_SETFREQUENCY(spi, CONFIG_PCD8544_FREQUENCY);
- }
- /**************************************************************************************
- * Name: pcd8544_deselect
- *
- * Description:
- * De-select the SPI
- *
- * Input Parameters:
- * spi - Reference to the SPI driver structure
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- *
- **************************************************************************************/
- static void pcd8544_deselect(FAR struct spi_dev_s *spi)
- {
- /* De-select PCD8544 chip and relinquish the SPI bus. */
- SPI_SELECT(spi, SPIDEV_DISPLAY(0), false);
- SPI_LOCK(spi, false);
- }
- /**************************************************************************************
- * Name: pcd8544_putrun
- *
- * Description:
- * This method can be used to write a partial raster line to the LCD:
- *
- * row - Starting row to write to (range: 0 <= row < yres)
- * col - Starting column to write to (range: 0 <= col <= xres-npixels)
- * buffer - The buffer containing the run to be written to the LCD
- * npixels - The number of pixels to write to the LCD
- * (range: 0 < npixels <= xres-col)
- *
- **************************************************************************************/
- static int pcd8544_putrun(fb_coord_t row, fb_coord_t col, FAR const 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;
- FAR uint8_t *ptr;
- uint8_t fbmask;
- uint8_t page;
- 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 remains on the display */
- if (pixlen <= 0 || row > PCD8544_YRES)
- {
- return OK;
- }
- /* 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];
- ptr = fbptr;
- #ifdef CONFIG_LCD_PACKEDMSFIRST
- usrmask = MS_BIT;
- #else
- usrmask = LS_BIT;
- #endif
- for (i = 0; i < pixlen; i++)
- {
- /* Set or clear the corresponding bit */
- if ((*buffer & usrmask) != 0)
- {
- *ptr++ |= fbmask;
- }
- else
- {
- *ptr++ &= ~fbmask;
- }
- /* Inc/Decrement to the next source pixel */
- #ifdef CONFIG_LCD_PACKEDMSFIRST
- if (usrmask == LS_BIT)
- {
- buffer++;
- usrmask = MS_BIT;
- }
- else
- {
- usrmask >>= 1;
- }
- #else
- if (usrmask == MS_BIT)
- {
- buffer++;
- usrmask = LS_BIT;
- }
- else
- {
- usrmask <<= 1;
- }
- #endif
- }
- /* Select and lock the device */
- pcd8544_select(priv->spi);
- /* Select command transfer */
- SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), true);
- /* Set the starting position for the run */
- (void)SPI_SEND(priv->spi, PCD8544_SET_Y_ADDR+page); /* Set the page start */
- (void)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 */
- (void)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) */
- (void)SPI_SEND(priv->spi, (PCD8544_FUNC_SET | PCD8544_POWER_DOWN));
- priv->powered = PCD8544_POWER_OFF;
- }
- else
- {
- /* Leave the power-down */
- (void)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 ) */
- (void)SPI_SEND(priv->spi, (PCD8544_FUNC_SET | PCD8544_MODEH));
- /* Set the contrast */
- (void)SPI_SEND(priv->spi, (PCD8544_WRITE_VOP | contrast) );
- /* Return to normal mode */
- (void)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 */
- (void)SPI_SEND(priv->spi, PCD8544_SET_Y_ADDR+i); /* Set the page start */
- (void)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 */
- (void)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 */
- (void)SPI_SEND(spi, (PCD8544_FUNC_SET | PCD8544_MODEH));
- /* Set LCD Bias to n = 3 */
- (void)SPI_SEND(spi, (PCD8544_BIAS_SYSTEM | PCD8544_BIAS_BS2));
- /* Select the normal instruction set mode H = 0 */
- (void)SPI_SEND(spi, PCD8544_FUNC_SET);
- /* Clear the screen */
- (void)SPI_SEND(spi, (PCD8544_DISP_CTRL | PCD8544_DISP_BLANK));
- /* Set the Display Control to Normal Mode D = 1 and E = 0 */
- (void)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;
- }
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