/************************************************************************************** * 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 * * Based on drivers/lcd/pcd8544.c. * * Copyright (C) 2013 Zilogic Systems. All rights reserved. * Author: Manikandan * * Copyright (C) 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #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 { /* Publicly 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); SPI_HWFEATURES(spi, 0); 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 */ 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; }