/************************************************************************************** * drivers/lcd/st7565.c * * Definitions for the ST7565 128x64 Dot Matrix LCD Driver with C * * Copyright (C) 2014 Pierre-noel Bouteville. All rights reserved. * Author: Pierre-noel Boutevlle * * Based on drivers/lcd/st7567.c * Copyright (C) 2013 Zilogic Systems. All rights reserved. * Author: Manikandan * * Based on drivers/lcd/ug-9664hswag01.c * * Copyright (C) 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Reference: "Product Specification, OEL Display Module, ST7567", Univision * Technology Inc., SAS1-6020-B, January 3, 2008. * * 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 "st7565.h" /************************************************************************************** * Pre-processor Definitions **************************************************************************************/ /* Configuration **********************************************************************/ /* ST7565 Configuration Settings: * * CONFIG_ST7565_NINTERFACES - Specifies the number of physical * ST7565 devices that will be supported. NOTE: At present, this * must be undefined or defined to be 1. * CONFIG_LCD_ST7565DEBUG - Enable detailed ST7565 debst7565 output * (CONFIG_DEBUG and CONFIG_VERBOSE must also be enabled). * * Required LCD driver settings: * CONFIG_LCD_ST7565 - Enable ST7565 support * CONFIG_LCD_MAXCONTRAST should be 255, but any value >0 and <=255 will be accepted. * */ /* Verify that all configuration requirements have been met */ /* CONFIG_ST7565_NINTERFACES determines the number of physical interfaces * that will be supported. */ #ifndef CONFIG_ST7565_NINTERFACES # define CONFIG_ST7565_NINTERFACES 1 #endif #if CONFIG_ST7565_NINTERFACES != 1 # warning "Only a single ST7565 interface is supported" # undef CONFIG_ST7565_NINTERFACES # define CONFIG_ST7565_NINTERFACES 1 #endif /* Verbose debst7565 must also be enabled to use the extra OLED debst7565 */ #ifndef CONFIG_DEBUG # undef CONFIG_DEBUG_VERBOSE # undef CONFIG_DEBUG_GRAPHICS #endif #ifndef CONFIG_DEBUG_VERBOSE # undef CONFIG_LCD_ST7565DEBUG #endif /* Check contrast selection */ #ifndef CONFIG_LCD_MAXCONTRAST # define CONFIG_LCD_MAXCONTRAST 255 #endif #if CONFIG_LCD_MAXCONTRAST <= 0 || CONFIG_LCD_MAXCONTRAST > 255 # error "CONFIG_LCD_MAXCONTRAST exceeds supported maximum" #endif #if CONFIG_LCD_MAXCONTRAST < 255 # warning "Optimal setting of CONFIG_LCD_MAXCONTRAST is 255" #endif /* Check power setting */ /* Color is 1bpp monochrome with leftmost column contained in bits 0 */ #ifdef CONFIG_NX_DISABLE_1BPP # warning "1 bit-per-pixel support needed" #endif /* Color Properties *******************************************************************/ /* The ST7565 display controller can handle a resolution of 128x64. */ /* Display Resolution */ #ifdef CONFIG_ST7565_XRES # define ST7565_XRES CONFIG_ST7565_XRES #else # define ST7565_XRES 128 #endif #ifdef CONFIG_ST7565_YRES # define ST7565_YRES CONFIG_ST7565_YRES #else # define ST7565_YRES 64 #endif /* Color depth and format */ #define ST7565_BPP 1 #define ST7565_COLORFMT FB_FMT_Y1 /* Bytes per logical row andactual device row */ #define ST7565_XSTRIDE (ST7565_XRES >> 3) /* Pixels arrange "horizontally * for user" */ #define ST7565_YSTRIDE (ST7565_YRES >> 3) /* But actual device * arrangement is "vertical" */ /* The size of the shadow frame buffer */ #define ST7565_FBSIZE (ST7565_XRES * ST7565_YSTRIDE) /* Bit helpers */ #define LS_BIT (1 << 0) #define MS_BIT (1 << 7) /* Debug ******************************************************************************/ #ifdef CONFIG_LCD_ST7565DEBUG # define st7565dbg(format, ...) vdbg(format, ##__VA_ARGS__) #else # define st7565dbg(x...) #endif /************************************************************************************** * Private Type Definition **************************************************************************************/ /* This structure describes the state of this driver */ struct st7565_dev_s { /* Publicly visible device structure */ struct lcd_dev_s dev; /* Private LCD-specific information follows */ FAR struct st7565_lcd_s *lcd; uint8_t contrast; uint8_t power_level; /* TODO implement READ mode, possible in 8080bus interface */ /* The ST7565 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[ST7565_FBSIZE]; }; /************************************************************************************** * Private Function Prototypes **************************************************************************************/ /* Drivers helpers */ static inline void st7565_reset(FAR struct st7565_dev_s *priv, bool on); static inline void st7565_select(FAR struct st7565_dev_s *priv); static inline void st7565_deselect(FAR struct st7565_dev_s *priv); static inline void st7565_cmddata(FAR struct st7565_dev_s *priv, bool cmd); static inline int st7565_send_one_data(FAR struct st7565_dev_s *priv, uint8_t data); static inline int st7565_send_data_buf(FAR struct st7565_dev_s *priv, FAR const uint8_t * buf, int size); static inline int st7565_backlight(FAR struct st7565_dev_s *priv, int level); /* LCD Data Transfer Methods */ static int st7565_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t * buffer, size_t npixels); static int st7565_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t * buffer, size_t npixels); /* LCD Configuration */ static int st7565_getvideoinfo(FAR struct lcd_dev_s *dev, FAR struct fb_videoinfo_s *vinfo); static int st7565_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 st7565_getpower(struct lcd_dev_s *dev); static int st7565_setpower(struct lcd_dev_s *dev, int power); static int st7565_getcontrast(struct lcd_dev_s *dev); static int st7565_setcontrast(struct lcd_dev_s *dev, unsigned int contrast); /* Initialization */ static inline void up_clear(FAR struct st7565_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[ST7565_XSTRIDE + 1]; /* This structure describes the overall LCD video controller */ static const struct fb_videoinfo_s g_videoinfo = { .fmt = ST7565_COLORFMT, /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */ .xres = ST7565_XRES, /* Horizontal resolution in pixel columns */ .yres = ST7565_YRES, /* Vertical resolution in pixel rows */ .nplanes = 1, /* Number of color planes supported */ }; /* This is the standard, NuttX Plane information object */ static const struct lcd_planeinfo_s g_planeinfo = { .putrun = st7565_putrun, /* Put a run into LCD memory */ .getrun = st7565_getrun, /* Get a run from LCD memory */ .buffer = (uint8_t *) g_runbuffer, /* Run scratch buffer */ .bpp = ST7565_BPP, /* Bits-per-pixel */ }; /* This is the standard, NuttX LCD driver object */ static struct st7565_dev_s g_st7565dev = { .dev = { /* LCD Configuration */ .getvideoinfo = st7565_getvideoinfo, .getplaneinfo = st7565_getplaneinfo, /* LCD RGB Mapping -- Not supported */ /* Cursor Controls -- Not supported */ /* LCD Specific Controls */ .getpower = st7565_getpower, .setpower = st7565_setpower, .getcontrast = st7565_getcontrast, .setcontrast = st7565_setcontrast, }, }; /************************************************************************************** * Private Functions **************************************************************************************/ /************************************************************************************** * Name: st7565_reset * * Description: * Enable/Disable reset pin of LCD the device. * * priv - A reference to the driver specific structure * **************************************************************************************/ static inline void st7565_reset(FAR struct st7565_dev_s *priv, bool on) { if (priv->lcd->reset != NULL) { priv->lcd->reset(priv->lcd, on); } } /************************************************************************************** * Name: st7565_select * * Description: * Select the device (as necessary) before performing any operations. * * priv - A reference to the driver specific structure * **************************************************************************************/ static inline void st7565_select(FAR struct st7565_dev_s *priv) { priv->lcd->select(priv->lcd); } /************************************************************************************** * Name: st7565_deselect * * Description: * Deselect the device (as necessary). * * priv - A reference to the driver specific structure * **************************************************************************************/ static inline void st7565_deselect(FAR struct st7565_dev_s *priv) { priv->lcd->deselect(priv->lcd); } /************************************************************************************** * Name: st7565_cmddata * * Description: * Select command (A0 = 0) or data (A0 = 1) mode. * * priv - A reference to the driver specific structure. * cmd - If true command mode will be selected. * **************************************************************************************/ static inline void st7565_cmddata(FAR struct st7565_dev_s *priv, bool cmd) { priv->lcd->cmddata(priv->lcd, cmd); } /************************************************************************************** * Name: st7565_send_one_data * * Description: * Send one data to the LCD driver (A0 = 1). * * priv - A reference to the driver specific structure. * data - Byte to send as data to LCD driver. * **************************************************************************************/ static inline int st7565_send_one_data(FAR struct st7565_dev_s *priv, uint8_t data) { return priv->lcd->senddata(priv->lcd, &data, 1); } /************************************************************************************** * Name: st7565_send_data_buf * * Description: * Send a data buffer to the LCD driver (A0 = 1). * * priv - A reference to the driver specific structure. * buf - Buffer sent as data to LCD driver. * size - Size of buffer in bytes. * **************************************************************************************/ static inline int st7565_send_data_buf(FAR struct st7565_dev_s *priv, FAR const uint8_t * buf, int size) { return priv->lcd->senddata(priv->lcd, buf, size); } /************************************************************************************** * Name: st7565_backlight * * Description: * Change backlight level of display. * * priv - A reference to the driver specific structure. * level - Set backlight pwm from 0 CONFIG_LCD_MAXPOWER-1. * **************************************************************************************/ static inline int st7565_backlight(FAR struct st7565_dev_s *priv, int level) { return priv->lcd->backlight(priv->lcd, level); } /************************************************************************************** * Name: st7565_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 st7565_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 * ST7565 device. */ FAR struct st7565_dev_s *priv = &g_st7565dev; FAR uint8_t *fbptr; FAR uint8_t *ptr; uint8_t fbmask; uint8_t page; uint8_t usrmask; uint8_t i; int pixlen; gvdbg("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)ST7565_XRES) { pixlen = (int)ST7565_XRES - (int)col; } /* Verify that some portion of the run remains on the display */ if (pixlen <= 0 || row > ST7565_YRES) { return OK; } /* Get the page number. The range of 64 lines is divided up into eight 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 | ... | 131 | * --------+---+---+---+---+-...-+-----+ * 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 * ST7565_XRES + col]; ptr = fbptr; #ifdef CONFIG_NX_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_NX_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 */ st7565_select(priv); /* Select command transfer */ st7565_cmddata(priv, true); /* Set the starting position for the run */ (void)st7565_send_one_data(priv, ST7565_SETPAGESTART + page); (void)st7565_send_one_data(priv, ST7565_SETCOLL + (col & 0x0f)); (void)st7565_send_one_data(priv, ST7565_SETCOLH + (col >> 4)); /* Select data transfer */ st7565_cmddata(priv, false); /* Then transfer all of the data */ (void)st7565_send_data_buf(priv, fbptr, pixlen); /* Unlock and de-select the device */ st7565_deselect(priv); return OK; } /************************************************************************************** * Name: st7565_getrun * * TODO implement read function that possible in 8080bus * * 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 st7565_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 * ST7565 device. */ FAR struct st7565_dev_s *priv = &g_st7565dev; FAR uint8_t *fbptr; uint8_t page; uint8_t fbmask; uint8_t usrmask; uint8_t i; int pixlen; gvdbg("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)ST7565_XRES) { pixlen = (int)ST7565_XRES - (int)col; } /* Verify that some portion of the run is actually the display */ if (pixlen <= 0 || row > ST7565_YRES) { return -EINVAL; } /* Then transfer the display data from the shadow frame buffer memory */ /* Get the page number. The range of 64 lines is divided up into eight 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 | ... | 131 | * --------+---+---+---+---+-...-+-----+ * 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 * ST7565_XRES + col]; #ifdef CONFIG_NX_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_NX_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: st7565_getvideoinfo * * Description: * Get information about the LCD video controller configuration. * **************************************************************************************/ static int st7565_getvideoinfo(FAR struct lcd_dev_s *dev, FAR struct fb_videoinfo_s *vinfo) { DEBUGASSERT(dev && vinfo); gvdbg("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: st7565_getplaneinfo * * Description: * Get information about the configuration of each LCD color plane. * **************************************************************************************/ static int st7565_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno, FAR struct lcd_planeinfo_s *pinfo) { DEBUGASSERT(dev && pinfo && planeno == 0); gvdbg("planeno: %d bpp: %d\n", planeno, g_planeinfo.bpp); memcpy(pinfo, &g_planeinfo, sizeof(struct lcd_planeinfo_s)); return OK; } /************************************************************************************** * Name: st7565_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 st7565_getpower(struct lcd_dev_s *dev) { struct st7565_dev_s *priv = (struct st7565_dev_s *)dev; DEBUGASSERT(priv); gvdbg("powered: %s\n", priv->power_level); return priv->power_level; } /************************************************************************************** * Name: st7565_setpower * * Description: * Enable/disable LCD panel power (0: full off - CONFIG_LCD_MAXPOWER: full on). On * backlight LCDs, this setting may correspond to the backlight setting. * **************************************************************************************/ static int st7565_setpower(struct lcd_dev_s *dev, int power) { struct st7565_dev_s *priv = (struct st7565_dev_s *)dev; DEBUGASSERT(priv && (unsigned)power <= CONFIG_LCD_MAXPOWER); gvdbg("power: %s powered: %s\n", power, priv->power_level); /* Select and lock the device */ st7565_select(priv); st7565_cmddata(priv, true); if (power <= 0) { /* Turn the display off */ (void)st7565_send_one_data(priv, ST7565_DISPOFF); (void)st7565_backlight(priv, 0); priv->power_level = 0; } else { (void)st7565_send_one_data(priv, ST7565_DISPON); (void)st7565_send_one_data(priv, ST7565_DISPRAM); /* Don't use value 1 of backlight to allow low power mode */ if (power == 1) { (void)st7565_backlight(priv, 0); } else { (void)st7565_backlight(priv, power); } priv->power_level = 1; } st7565_cmddata(priv, false); st7565_deselect(priv); return OK; } /************************************************************************************** * Name: st7565_getcontrast * * Description: * Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST). * **************************************************************************************/ static int st7565_getcontrast(struct lcd_dev_s *dev) { struct st7565_dev_s *priv = (struct st7565_dev_s *)dev; DEBUGASSERT(priv); return (int)priv->contrast; } /************************************************************************************** * Name: st7565_setcontrast * * Description: * Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST). * **************************************************************************************/ static int st7565_setcontrast(struct lcd_dev_s *dev, unsigned int contrast) { struct st7565_dev_s *priv = (struct st7565_dev_s *)dev; gvdbg("contrast: %d\n", contrast); DEBUGASSERT(priv); if (contrast > 255) { return -EINVAL; } /* Select and lock the device */ st7565_select(priv); /* Select command transfer */ st7565_cmddata(priv, true); /* Set the contrast */ (void)st7565_send_one_data(priv, ST7565_SETEVMODE); (void)st7565_send_one_data(priv, ST7565_SETEVREG(contrast)); priv->contrast = contrast; /* Deselect command transfer */ st7565_cmddata(priv, false); /* Unlock and de-select the device */ st7565_deselect(priv); return OK; } /************************************************************************************** * Name: up_clear * * Description: * Clear the display. * **************************************************************************************/ static inline void up_clear(FAR struct st7565_dev_s *priv) { int page; int i; /* Clear the framebuffer */ memset(priv->fb, 0x00, ST7565_FBSIZE); /* Select and lock the device */ st7565_select(priv); /* Go throw all 8 pages */ for (page = 0, i = 0; i < 8; i++) { /* Select command transfer */ st7565_cmddata(priv, true); /* Set the starting position for the run */ (void)st7565_send_one_data(priv, ST7565_SETPAGESTART + i); (void)st7565_send_one_data(priv, ST7565_SETCOLL); (void)st7565_send_one_data(priv, ST7565_SETCOLH); /* Select data transfer */ st7565_cmddata(priv, false); /* Then transfer all 96 columns of data */ (void)st7565_send_data_buf(priv, &priv->fb[page * ST7565_XRES], ST7565_XRES); } /* Unlock and de-select the device */ st7565_deselect(priv); } /************************************************************************************** * Public Functions **************************************************************************************/ /************************************************************************************** * Name: st7565_initialize * * Description: * Initialize the ST7565 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: * * lcd - A reference to the lcd low level driver instance. * devno - A value in the range of 0 throw CONFIG_ST7565_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 *st7565_initialize(FAR struct st7565_lcd_s *lcd, unsigned int devno) { /* Configure and enable LCD */ FAR struct st7565_dev_s *priv = &g_st7565dev; gvdbg("Initializing\n"); DEBUGASSERT(lcd && devno == 0); /* Save the reference to the SPI device */ priv->lcd = lcd; /* Select and lock the device */ st7565_select(priv); /* Reset device */ st7565_reset(priv, true); /* it seems too long but written in NHD‐C12864KGZ DISPLAY * INITIALIZATION... */ up_mdelay(150); st7565_reset(priv, false); /* it seems too long but written in NHD‐C12864KGZ DISPLAY * INITIALIZATION... */ up_mdelay(150); /* Make sure that LCD backlight is off */ st7565_backlight(priv, 0); /* Select command transfer */ st7565_cmddata(priv, true); /* reset by command in case of st7565_reset not implemeted */ (void)st7565_send_one_data(priv, ST7565_EXIT_SOFTRST); /* Follow NHD-C12864KGZ DISPLAY INITIALIZATION... */ #ifdef CONFIG_NHD_C12864KGZ (void)st7565_send_one_data(priv, ST7565_BIAS_1_9); (void)st7565_send_one_data(priv, ST7565_REG_RES_5_5); (void)st7565_send_one_data(priv, ST7565_SETEVMODE); (void)st7565_send_one_data(priv, ST7565_SETEVREG(15)); (void)st7565_send_one_data(priv, ST7565_POWERCTRL_INT); (void)st7565_send_one_data(priv, ST7565_SETSTARTLINE); #else # error "No initialization sequence selected" #endif #if 0 (void)st7565_send_one_data(priv, ST7565_DISPON); (void)st7565_send_one_data(priv, ST7565_SETCOMREVERSE); (void)st7565_send_one_data(priv, ST7565_REG_RES_RR1); (void)st7565_send_one_data(priv, ST7565_SETEV); (void)st7565_send_one_data(priv, 0x32); (void)st7565_send_one_data(priv, ST7565_POWERCTRL); (void)st7565_send_one_data(priv, ST7565_SETSTARTLINE); (void)st7565_send_one_data(priv, ST7565_SETPAGESTART); (void)st7565_send_one_data(priv, ST7565_SETCOLH); (void)st7565_send_one_data(priv, ST7565_SETCOLL); (void)st7565_send_one_data(priv, ST7565_DISPON); (void)st7565_send_one_data(priv, ST7565_DISPRAM); #endif #ifdef CONFIG_ST7565_MIRROR_X (void)st7565_send_one_data(priv, ST7565_ADCINVERSE); #else (void)st7565_send_one_data(priv, ST7565_ADCNORMAL); #endif #ifdef CONFIG_ST7565_MIRROR_Y (void)st7565_send_one_data(priv, ST7565_SETCOMREVERSE); #else (void)st7565_send_one_data(priv, ST7565_SETCOMNORMAL); #endif #ifdef CONFIG_ST7565_INVERSE_VIDEO (void)st7565_send_one_data(priv, ST7565_DISPINVERSE); #else (void)st7565_send_one_data(priv, ST7565_DISPNORMAL); #endif /* Let go of the SPI lock and de-select the device */ st7565_deselect(priv); up_mdelay(10); /* Clear the framebuffer */ up_clear(priv); return &priv->dev; }