/**************************************************************************** * drivers/lcd/st7735.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include "st7735.h" #ifdef CONFIG_LCD_ST7735 /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define MAX(a,b) ((a)>(b)?(a):(b)) /* Verify that all configuration requirements have been met */ #ifndef CONFIG_LCD_ST7735_SPIMODE # define CONFIG_LCD_ST7735_SPIMODE SPIDEV_MODE0 #endif /* SPI frequency */ #ifndef CONFIG_LCD_ST7735_FREQUENCY # define CONFIG_LCD_ST7735_FREQUENCY 3000000 #endif /* Check contrast selection */ #if !defined(CONFIG_LCD_MAXCONTRAST) # define CONFIG_LCD_MAXCONTRAST 1 #endif /* Check power setting */ #if !defined(CONFIG_LCD_MAXPOWER) || CONFIG_LCD_MAXPOWER < 1 # define CONFIG_LCD_MAXPOWER 1 #endif #if CONFIG_LCD_MAXPOWER > 255 # error "CONFIG_LCD_MAXPOWER must be less than 256 to fit in uint8_t" #endif /* Check orientation */ #if defined(CONFIG_LCD_PORTRAIT) # if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE) ||\ defined(CONFIG_LCD_RPORTRAIT) # error "Cannot define both portrait and any other orientations" # endif #elif defined(CONFIG_LCD_RPORTRAIT) # if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE) # error "Cannot define both rportrait and any other orientations" # endif #elif defined(CONFIG_LCD_LANDSCAPE) # ifdef CONFIG_LCD_RLANDSCAPE # error "Cannot define both landscape and any other orientations" # endif #elif !defined(CONFIG_LCD_RLANDSCAPE) # define CONFIG_LCD_LANDSCAPE 1 #endif /* Display Resolution */ #if defined(CONFIG_LCD_ST7735_GM00) # define CONFIG_LCD_ST7735_XRES 132 # define CONFIG_LCD_ST7735_YRES 162 # define CONFIG_LCD_ST7735_XOFFSET 0 # define CONFIG_LCD_ST7735_YOFFSET 0 #elif defined(CONFIG_LCD_ST7735_GM01) # define CONFIG_LCD_ST7735_XRES 132 # define CONFIG_LCD_ST7735_YRES 132 # define CONFIG_LCD_ST7735_XOFFSET 0 # define CONFIG_LCD_ST7735_YOFFSET 0 #elif defined(CONFIG_LCD_ST7735_GM11) # define CONFIG_LCD_ST7735_XRES 128 # define CONFIG_LCD_ST7735_YRES 160 # define CONFIG_LCD_ST7735_XOFFSET 0 # define CONFIG_LCD_ST7735_YOFFSET 0 #endif #if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE) # define ST7735_XRES CONFIG_LCD_ST7735_YRES # define ST7735_YRES CONFIG_LCD_ST7735_XRES # define ST7735_XOFFSET CONFIG_LCD_ST7735_YOFFSET # define ST7735_YOFFSET CONFIG_LCD_ST7735_XOFFSET #else # define ST7735_XRES CONFIG_LCD_ST7735_XRES # define ST7735_YRES CONFIG_LCD_ST7735_YRES # define ST7735_XOFFSET CONFIG_LCD_ST7735_XOFFSET # define ST7735_YOFFSET CONFIG_LCD_ST7735_YOFFSET #endif #define ST7735_LUT_SIZE MAX(CONFIG_LCD_ST7735_XRES, CONFIG_LCD_ST7735_YRES) /* Color depth and format */ #ifdef CONFIG_LCD_ST7735_BPP # if (CONFIG_LCD_ST7735_BPP == 12) # define ST7735_BPP 12 # define ST7735_COLORFMT FB_FMT_RGB12_444 # define ST7735_BYTESPP 2 # elif (CONFIG_LCD_ST7735_BPP == 16) # define ST7735_BPP 16 # define ST7735_COLORFMT FB_FMT_RGB16_565 # define ST7735_BYTESPP 2 # elif (CONFIG_LCD_ST7735_BPP == 18) # define ST7735_BPP 18 # define ST7735_COLORFMT FB_FMT_RGB16_666 # define ST7735_BYTESPP 3 # else # define ST7735_BPP 16 # define ST7735_COLORFMT FB_FMT_RGB16_565 # define ST7735_BYTESPP 2 # warning "Invalid color depth. Falling back to 16bpp" # endif #endif /**************************************************************************** * Private Types ****************************************************************************/ /* This structure describes the state of this driver */ struct st7735_dev_s { /* Publicly visible device structure */ struct lcd_dev_s dev; /* Private LCD-specific information follows */ FAR struct spi_dev_s *spi; /* SPI device */ uint8_t bpp; /* Selected color depth */ uint8_t power; /* Current power setting */ /* 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. */ uint16_t runbuffer[ST7735_LUT_SIZE]; }; /**************************************************************************** * Private Function Protototypes ****************************************************************************/ /* Misc. Helpers */ static void st7735_select(FAR struct spi_dev_s *spi, int bits); static void st7735_deselect(FAR struct spi_dev_s *spi); static inline void st7735_sendcmd(FAR struct st7735_dev_s *dev, uint8_t cmd); static void st7735_sleep(FAR struct st7735_dev_s *dev, bool sleep); static void st7735_display(FAR struct st7735_dev_s *dev, bool on); static void st7735_setorientation(FAR struct st7735_dev_s *dev); static void st7735_setarea(FAR struct st7735_dev_s *dev, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1); static void st7735_bpp(FAR struct st7735_dev_s *dev, int bpp); static void st7735_wrram(FAR struct st7735_dev_s *dev, FAR const uint16_t *buff, size_t size); static void st7735_rdram(FAR struct st7735_dev_s *dev, FAR uint16_t *buff, size_t size); static void st7735_fill(FAR struct st7735_dev_s *dev, uint16_t color); /* LCD Data Transfer Methods */ static int st7735_putrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer, size_t npixels); #ifndef CONFIG_LCD_NOGETRUN static int st7735_getrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer, size_t npixels); #endif /* LCD Configuration */ static int st7735_getvideoinfo(FAR struct lcd_dev_s *dev, FAR struct fb_videoinfo_s *vinfo); static int st7735_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno, FAR struct lcd_planeinfo_s *pinfo); /* LCD Specific Controls */ static int st7735_getpower(FAR struct lcd_dev_s *dev); static int st7735_setpower(FAR struct lcd_dev_s *dev, int power); static int st7735_getcontrast(FAR struct lcd_dev_s *dev); static int st7735_setcontrast(FAR struct lcd_dev_s *dev, unsigned int contrast); /**************************************************************************** * Private Data ****************************************************************************/ static struct st7735_dev_s g_lcddev; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: st7735_select * * Description: * Select the SPI, locking and re-configuring if necessary * * Input Parameters: * spi - Reference to the SPI driver structure * bits - Number of SPI bits * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void st7735_select(FAR struct spi_dev_s *spi, int bits) { /* Select ST7735 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 ST7735 (it * might have gotten configured for a different device while unlocked) */ SPI_SETMODE(spi, CONFIG_LCD_ST7735_SPIMODE); SPI_SETBITS(spi, bits); SPI_SETFREQUENCY(spi, CONFIG_LCD_ST7735_FREQUENCY); } /**************************************************************************** * Name: st7735_deselect * * Description: * De-select the SPI * * Input Parameters: * spi - Reference to the SPI driver structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void st7735_deselect(FAR struct spi_dev_s *spi) { /* De-select ST7735 chip and relinquish the SPI bus. */ SPI_SELECT(spi, SPIDEV_DISPLAY(0), false); SPI_LOCK(spi, false); } /**************************************************************************** * Name: st7735_sendcmd * * Description: * Send a command to the driver. * ****************************************************************************/ static inline void st7735_sendcmd(FAR struct st7735_dev_s *dev, uint8_t cmd) { st7735_select(dev->spi, 8); SPI_CMDDATA(dev->spi, SPIDEV_DISPLAY(0), true); SPI_SEND(dev->spi, cmd); SPI_CMDDATA(dev->spi, SPIDEV_DISPLAY(0), false); st7735_deselect(dev->spi); } /**************************************************************************** * Name: st7735_sleep * * Description: * Sleep or wake up the driver. * ****************************************************************************/ static void st7735_sleep(FAR struct st7735_dev_s *dev, bool sleep) { st7735_sendcmd(dev, sleep ? ST7735_SLPIN : ST7735_SLPOUT); up_mdelay(120); } /**************************************************************************** * Name: st7735_display * * Description: * Turn on or off the display. * ****************************************************************************/ static void st7735_display(FAR struct st7735_dev_s *dev, bool on) { st7735_sendcmd(dev, on ? ST7735_DISPON : ST7735_DISPOFF); } /**************************************************************************** * Name: st7735_setorientation * * Description: * Set screen orientation. * ****************************************************************************/ static void st7735_setorientation(FAR struct st7735_dev_s *dev) { /* No need to change the orientation in PORTRAIT mode and RGB panel */ #if !defined(CONFIG_LCD_PORTRAIT) || defined(CONFIG_LCD_ST7735_BGR) uint8_t reg = 0x00; st7735_sendcmd(dev, ST7735_MADCTL); st7735_select(dev->spi, 8); # if defined(CONFIG_LCD_RLANDSCAPE) /* RLANDSCAPE : MY=1 MV=1 */ reg = ST7735_MADCTL_MY | ST7735_MADCTL_MV; # elif defined(CONFIG_LCD_LANDSCAPE) /* LANDSCAPE : MX=1 MV=1 */ reg = ST7735_MADCTL_MX | ST7735_MADCTL_MV; # elif defined(CONFIG_LCD_RPORTRAIT) /* RPORTRAIT : MX=1 MY=1 */ reg = ST7735_MADCTL_MX | ST7735_MADCTL_MY; # endif # if defined(CONFIG_LCD_ST7735_BGR) reg |= ST7735_MADCTL_BGR; # endif SPI_SEND(dev->spi, reg); st7735_deselect(dev->spi); #endif } /**************************************************************************** * Name: st7735_setarea * * Description: * Set the rectangular area for an upcoming read or write from RAM. * ****************************************************************************/ static void st7735_setarea(FAR struct st7735_dev_s *dev, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) { /* Set row address */ st7735_sendcmd(dev, ST7735_RASET); st7735_select(dev->spi, 8); SPI_SEND(dev->spi, (y0 + ST7735_YOFFSET) >> 8); SPI_SEND(dev->spi, (y0 + ST7735_YOFFSET) & 0xff); SPI_SEND(dev->spi, (y1 + ST7735_YOFFSET) >> 8); SPI_SEND(dev->spi, (y1 + ST7735_YOFFSET) & 0xff); st7735_deselect(dev->spi); /* Set column address */ st7735_sendcmd(dev, ST7735_CASET); st7735_select(dev->spi, 8); SPI_SEND(dev->spi, (x0 + ST7735_XOFFSET) >> 8); SPI_SEND(dev->spi, (x0 + ST7735_XOFFSET) & 0xff); SPI_SEND(dev->spi, (x1 + ST7735_XOFFSET) >> 8); SPI_SEND(dev->spi, (x1 + ST7735_XOFFSET) & 0xff); st7735_deselect(dev->spi); } /**************************************************************************** * Name: st7735_bpp * * Description: * Set the color depth of the device. * ****************************************************************************/ static void st7735_bpp(FAR struct st7735_dev_s *dev, int bpp) { uint8_t depth; /* Don't send any command if the depth hasn't changed. */ if (dev->bpp != bpp) { /* REVISIT: Works only for 12 and 16 bpp! */ depth = bpp >> 2 | 1; st7735_sendcmd(dev, ST7735_COLMOD); st7735_select(dev->spi, 8); SPI_SEND(dev->spi, depth); st7735_deselect(dev->spi); /* Cache the new BPP */ dev->bpp = bpp; } } /**************************************************************************** * Name: st7735_wrram * * Description: * Write to the driver's RAM. * ****************************************************************************/ static void st7735_wrram(FAR struct st7735_dev_s *dev, FAR const uint16_t *buff, size_t size) { st7735_sendcmd(dev, ST7735_RAMWR); st7735_select(dev->spi, ST7735_BYTESPP * 8); SPI_SNDBLOCK(dev->spi, buff, size); st7735_deselect(dev->spi); } /**************************************************************************** * Name: st7735_rdram * * Description: * Read from the driver's RAM. * ****************************************************************************/ static void st7735_rdram(FAR struct st7735_dev_s *dev, FAR uint16_t *buff, size_t size) { st7735_sendcmd(dev, ST7735_RAMRD); st7735_select(dev->spi, ST7735_BYTESPP * 8); SPI_RECVBLOCK(dev->spi, buff, size); st7735_deselect(dev->spi); } /**************************************************************************** * Name: st7735_fill * * Description: * Fill the display with the specified color. * ****************************************************************************/ static void st7735_fill(FAR struct st7735_dev_s *dev, uint16_t color) { int i; st7735_setarea(dev, 0, 0, ST7735_XRES - 1, ST7735_YRES - 1); st7735_sendcmd(dev, ST7735_RAMWR); st7735_select(dev->spi, ST7735_BYTESPP * 8); for (i = 0; i < ST7735_XRES * ST7735_YRES; i++) { SPI_SEND(dev->spi, color); } st7735_deselect(dev->spi); } /**************************************************************************** * Name: st7735_putrun * * Description: * This method can be used to write a partial raster line to the LCD: * * dev - The lcd device * 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 st7735_putrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer, size_t npixels) { FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev; FAR const uint16_t *src = (FAR const uint16_t *)buffer; ginfo("row: %d col: %d npixels: %d\n", row, col, npixels); DEBUGASSERT(buffer && ((uintptr_t)buffer & 1) == 0); st7735_setarea(priv, col, row, col + npixels - 1, row); st7735_wrram(priv, src, npixels); return OK; } /**************************************************************************** * Name: st7735_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) * ****************************************************************************/ #ifndef CONFIG_LCD_NOGETRUN static int st7735_getrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer, size_t npixels) { FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev; FAR uint16_t *dest = (FAR uint16_t *)buffer; ginfo("row: %d col: %d npixels: %d\n", row, col, npixels); DEBUGASSERT(buffer && ((uintptr_t)buffer & 1) == 0); st7735_setarea(priv, col, row, col + npixels - 1, row); st7735_rdram(priv, dest, npixels); return OK; } #endif /**************************************************************************** * Name: st7735_getvideoinfo * * Description: * Get information about the LCD video controller configuration. * ****************************************************************************/ static int st7735_getvideoinfo(FAR struct lcd_dev_s *dev, FAR struct fb_videoinfo_s *vinfo) { DEBUGASSERT(dev && vinfo); lcdinfo("fmt: %d xres: %d yres: %d nplanes: 1\n", ST7735_COLORFMT, ST7735_XRES, ST7735_YRES); vinfo->fmt = ST7735_COLORFMT; /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */ vinfo->xres = ST7735_XRES; /* Horizontal resolution in pixel columns */ vinfo->yres = ST7735_YRES; /* Vertical resolution in pixel rows */ vinfo->nplanes = 1; /* Number of color planes supported */ return OK; } /**************************************************************************** * Name: st7735_getplaneinfo * * Description: * Get information about the configuration of each LCD color plane. * ****************************************************************************/ static int st7735_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno, FAR struct lcd_planeinfo_s *pinfo) { FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev; DEBUGASSERT(dev && pinfo && planeno == 0); lcdinfo("planeno: %d bpp: %d\n", planeno, ST7735_BPP); pinfo->putrun = st7735_putrun; /* Put a run into LCD memory */ #ifndef CONFIG_LCD_NOGETRUN pinfo->getrun = st7735_getrun; /* Get a run from LCD memory */ #endif pinfo->buffer = (FAR uint8_t *)priv->runbuffer; /* Run scratch buffer */ pinfo->bpp = priv->bpp; /* Bits-per-pixel */ pinfo->dev = dev; /* The lcd device */ return OK; } /**************************************************************************** * Name: st7735_getpower ****************************************************************************/ static int st7735_getpower(FAR struct lcd_dev_s *dev) { FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev; lcdinfo("power: %d\n", priv->power); return priv->power; } /**************************************************************************** * Name: st7735_setpower ****************************************************************************/ static int st7735_setpower(FAR struct lcd_dev_s *dev, int power) { FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev; lcdinfo("power: %d\n", power); DEBUGASSERT((unsigned)power <= CONFIG_LCD_MAXPOWER); /* Set new power level */ if (power > 0) { /* Turn on the display */ st7735_display(priv, true); /* Save the power */ priv->power = power; } else { /* Turn off the display */ st7735_display(priv, false); /* Save the power */ priv->power = 0; } return OK; } /**************************************************************************** * Name: st7735_getcontrast * * Description: * Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST). * ****************************************************************************/ static int st7735_getcontrast(FAR struct lcd_dev_s *dev) { lcdinfo("Not implemented\n"); return -ENOSYS; } /**************************************************************************** * Name: st7735_setcontrast * * Description: * Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST). * ****************************************************************************/ static int st7735_setcontrast(FAR struct lcd_dev_s *dev, unsigned int contrast) { lcdinfo("contrast: %d\n", contrast); return -ENOSYS; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: st7735_initialize * * Description: * Initialize the ST7735 video hardware. The initial state of the * LCD is fully initialized, display memory cleared, and the LCD ready * to use, but with the power setting at 0 (full off == sleep mode). * * 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 *st7735_lcdinitialize(FAR struct spi_dev_s *spi) { FAR struct st7735_dev_s *priv = &g_lcddev; /* Initialize the driver data structure */ priv->dev.getvideoinfo = st7735_getvideoinfo; priv->dev.getplaneinfo = st7735_getplaneinfo; priv->dev.getpower = st7735_getpower; priv->dev.setpower = st7735_setpower; priv->dev.getcontrast = st7735_getcontrast; priv->dev.setcontrast = st7735_setcontrast; priv->spi = spi; /* Init the hardware and clear the display */ st7735_sleep(priv, false); st7735_bpp(priv, ST7735_BPP); st7735_setorientation(priv); st7735_display(priv, true); st7735_fill(priv, 0xffff); return &priv->dev; } #endif /* CONFIG_LCD_ST7735 */