/**************************************************************************** * drivers/lcd/st7567.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. * ****************************************************************************/ /* Driver for the TM12864J1CCWGWA Display with the ST7567 LCD * controller. * * Reference: * "Product Specification, OEL Display Module, ST7567", Univision * Technology Inc., SAS1-6020-B, January 3, 2008. */ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include "st7567.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ /* ST7567 Configuration Settings: * * CONFIG_ST7567_SPIMODE - Controls the SPI mode * CONFIG_ST7567_FREQUENCY - Define to use a different bus frequency * CONFIG_ST7567_NINTERFACES - Specifies the number of physical * ST7567 devices that will be supported. NOTE: At present, this * must be undefined or defined to be 1. * CONFIG_ST7567_POWER * If the hardware supports a controllable OLED a power supply, this * configuration should be defined. (See st7567_power() below). * CONFIG_LCD_ST7567DEBUG - Enable detailed ST7567 debst7567 output * (CONFIG_DEBUG_FEATURES and CONFIG_VERBOSE must also be enabled). * * Required LCD driver settings: * CONFIG_LCD_ST7567 - Enable ST7567 support * CONFIG_LCD_MAXCONTRAST should be 255, but any value >0 and <=255 will be * accepted. * CONFIG_LCD_MAXPOWER should be 2: 0=off, 1=dim, 2=normal * * Required SPI driver settings: * CONFIG_SPI_CMDDATA - Include support for cmd/data selection. */ /* Verify that all configuration requirements have been met */ /* The ST7567 spec says that is supports SPI mode 0,0 only. * However, sometimes you need to tinker with these things. */ #ifndef CONFIG_ST7567_SPIMODE # define CONFIG_ST7567_SPIMODE SPIDEV_MODE0 #endif /* SPI frequency */ #ifndef CONFIG_ST7567_FREQUENCY # define CONFIG_ST7567_FREQUENCY 3500000 #endif /* CONFIG_ST7567_NINTERFACES determines the number of physical interfaces * that will be supported. */ #ifndef CONFIG_ST7567_NINTERFACES # define CONFIG_ST7567_NINTERFACES 1 #endif #if CONFIG_ST7567_NINTERFACES != 1 # warning "Only a single ST7567 interface is supported" # undef CONFIG_ST7567_NINTERFACES # define CONFIG_ST7567_NINTERFACES 1 #endif /* Verbose debst7567 must also be enabled to use the extra OLED debst7567 */ #ifndef CONFIG_DEBUG_FEATURES # undef CONFIG_DEBUG_INFO # undef CONFIG_DEBUG_GRAPHICS #endif #ifndef CONFIG_DEBUG_INFO # undef CONFIG_LCD_ST7567DEBUG #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 */ #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 OLED requires CMD/DATA SPI support */ #ifndef CONFIG_SPI_CMDDATA # error "CONFIG_SPI_CMDDATA must be defined in your NuttX configuration" #endif /* Color Properties *********************************************************/ /* The ST7567 display controller can handle a resolution of 128x64. */ /* Display Resolution */ #ifdef CONFIG_ST7567_XRES #define ST7567_XRES CONFIG_ST7567_XRES #else #define ST7567_XRES 128 #endif #ifdef CONFIG_ST7567_YRES #define ST7567_YRES CONFIG_ST7567_YRES #else #define ST7567_YRES 64 #endif /* Color depth and format */ #define ST7567_BPP 1 #define ST7567_COLORFMT FB_FMT_Y1 /* Bytes per logical row andactual device row */ #define ST7567_XSTRIDE (ST7567_XRES >> 3) /* Pixels arrange "horizontally for user" */ #define ST7567_YSTRIDE (ST7567_YRES >> 3) /* But actual device arrangement is "vertical" */ /* The size of the shadow frame buffer */ #define ST7567_FBSIZE (ST7567_XRES * ST7567_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 st7567_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 ST7567 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[ST7567_FBSIZE]; }; /**************************************************************************** * Private Function Protototypes ****************************************************************************/ /* SPI helpers */ static void st7567_select(FAR struct spi_dev_s *spi); static void st7567_deselect(FAR struct spi_dev_s *spi); /* LCD Data Transfer Methods */ static int st7567_putrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer, size_t npixels); static int st7567_getrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer, size_t npixels); /* LCD Configuration */ static int st7567_getvideoinfo(FAR struct lcd_dev_s *dev, FAR struct fb_videoinfo_s *vinfo); static int st7567_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 st7567_getpower(struct lcd_dev_s *dev); static int st7567_setpower(struct lcd_dev_s *dev, int power); static int st7567_getcontrast(struct lcd_dev_s *dev); static int st7567_setcontrast(struct lcd_dev_s *dev, unsigned int contrast); /* Initialization */ static inline void up_clear(FAR struct st7567_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[ST7567_XSTRIDE + 1]; /* This structure describes the overall LCD video controller */ static const struct fb_videoinfo_s g_videoinfo = { .fmt = ST7567_COLORFMT, /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */ .xres = ST7567_XRES, /* Horizontal resolution in pixel columns */ .yres = ST7567_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 = st7567_putrun, /* Put a run into LCD memory */ .getrun = st7567_getrun, /* Get a run from LCD memory */ .buffer = (FAR uint8_t *)g_runbuffer, /* Run scratch buffer */ .bpp = ST7567_BPP, /* Bits-per-pixel */ }; /* This is the standard, NuttX LCD driver object */ static struct st7567_dev_s g_st7567dev = { .dev = { /* LCD Configuration */ .getvideoinfo = st7567_getvideoinfo, .getplaneinfo = st7567_getplaneinfo, /* LCD RGB Mapping -- Not supported */ /* Cursor Controls -- Not supported */ /* LCD Specific Controls */ .getpower = st7567_getpower, .setpower = st7567_setpower, .getcontrast = st7567_getcontrast, .setcontrast = st7567_setcontrast, }, }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: st7567_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 st7567_select(FAR struct spi_dev_s *spi) { /* Select ST7567 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 ST7567 (it * might have gotten configured for a different device while unlocked) */ SPI_SETMODE(spi, CONFIG_ST7567_SPIMODE); SPI_SETBITS(spi, 8); SPI_HWFEATURES(spi, 0); #ifdef CONFIG_ST7567_FREQUENCY SPI_SETFREQUENCY(spi, CONFIG_ST7567_FREQUENCY); #endif } /**************************************************************************** * Name: st7567_deselect * * Description: * De-select the SPI * * Input Parameters: * spi - Reference to the SPI driver structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void st7567_deselect(FAR struct spi_dev_s *spi) { /* De-select ST7567 chip and relinquish the SPI bus. */ SPI_SELECT(spi, SPIDEV_DISPLAY(0), false); SPI_LOCK(spi, false); } /**************************************************************************** * Name: st7567_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 st7567_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 st7567_dev_s *priv = (FAR struct st7567_dev_s *)dev; 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)ST7567_XRES) { pixlen = (int)ST7567_XRES - (int)col; } /* Verify that some portion of the run remains on the display */ if (pixlen <= 0 || row > ST7567_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 * ST7567_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 */ st7567_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, ST7567_SETPAGESTART + page); /* Set the page start */ SPI_SEND(priv->spi, ST7567_SETCOLL + (col & 0x0f)); /* Set the low column */ SPI_SEND(priv->spi, ST7567_SETCOLH + (col >> 4)); /* Set the high 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 */ st7567_deselect(priv->spi); return OK; } /**************************************************************************** * Name: st7567_getrun * * Description: * This method can be used to read a partial raster line from the LCD: * * dev - The lcd device * 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 st7567_getrun(FAR struct lcd_dev_s *dev, fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer, size_t npixels) { FAR struct st7567_dev_s *priv = (FAR struct st7567_dev_s *)dev; 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)ST7567_XRES) { pixlen = (int)ST7567_XRES - (int)col; } /* Verify that some portion of the run is actually the display */ if (pixlen <= 0 || row > ST7567_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 * ST7567_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: st7567_getvideoinfo * * Description: * Get information about the LCD video controller configuration. * ****************************************************************************/ static int st7567_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: st7567_getplaneinfo * * Description: * Get information about the configuration of each LCD color plane. * ****************************************************************************/ static int st7567_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)); pinfo->dev = dev; return OK; } /**************************************************************************** * Name: st7567_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 st7567_getpower(struct lcd_dev_s *dev) { struct st7567_dev_s *priv = (struct st7567_dev_s *)dev; DEBUGASSERT(priv); return priv->powered; } /**************************************************************************** * Name: st7567_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 st7567_setpower(struct lcd_dev_s *dev, int power) { struct st7567_dev_s *priv = (struct st7567_dev_s *)dev; DEBUGASSERT(priv && (unsigned)power <= CONFIG_LCD_MAXPOWER); /* Select and lock the device */ st7567_select(priv->spi); if (power <= ST7567_POWER_OFF) { /* Turn the display off */ SPI_SEND(priv->spi, ST7567_DISPOFF); /* Display off */ priv->powered = ST7567_POWER_OFF; } else { SPI_SEND(priv->spi, ST7567_DISPON); /* Display on, normal mode */ power = ST7567_POWER_ON; SPI_SEND(priv->spi, ST7567_DISPRAM); /* Resume to RAM content display */ priv->powered = power; } st7567_deselect(priv->spi); return OK; } /**************************************************************************** * Name: st7567_getcontrast * * Description: * Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST). * ****************************************************************************/ static int st7567_getcontrast(struct lcd_dev_s *dev) { struct st7567_dev_s *priv = (struct st7567_dev_s *)dev; DEBUGASSERT(priv); return (int)priv->contrast; } /**************************************************************************** * Name: st7567_setcontrast * * Description: * Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST). * ****************************************************************************/ static int st7567_setcontrast(struct lcd_dev_s *dev, unsigned int contrast) { struct st7567_dev_s *priv = (struct st7567_dev_s *)dev; ginfo("contrast: %d\n", contrast); DEBUGASSERT(priv); if (contrast > 255) { return -EINVAL; } /* Select and lock the device */ st7567_select(priv->spi); /* Select command transfer */ SPI_CMDDATA(priv->spi, SPIDEV_DISPLAY(0), true); /* Set the contrast */ SPI_SEND(priv->spi, ST7567_SETEV); /* Set contrast control register */ SPI_SEND(priv->spi, contrast); /* Data 1: Set 1 of 256 contrast steps */ priv->contrast = contrast; /* Unlock and de-select the device */ st7567_deselect(priv->spi); return OK; } /**************************************************************************** * Name: up_clear * * Description: * Clear the display. * ****************************************************************************/ static inline void up_clear(FAR struct st7567_dev_s *priv) { FAR struct spi_dev_s *spi = priv->spi; int page; int i; /* Clear the framebuffer */ memset(priv->fb, ST7567_Y1_BLACK, ST7567_FBSIZE); /* Select and lock the device */ st7567_select(priv->spi); /* Go throst7567h all 8 pages */ for (page = 0, i = 0; i < 8; i++) { /* Select command transfer */ SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), true); /* Set the starting position for the run */ SPI_SEND(priv->spi, ST7567_SETPAGESTART + i); SPI_SEND(priv->spi, ST7567_SETCOLL); SPI_SEND(priv->spi, ST7567_SETCOLH); /* Select data transfer */ SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), false); /* Then transfer all 96 columns of data */ SPI_SNDBLOCK(priv->spi, &priv->fb[page * ST7567_XRES], ST7567_XRES); } /* Unlock and de-select the device */ st7567_deselect(spi); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: st7567_initialize * * Description: * Initialize the ST7567 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 throst7567h * CONFIG_ST7567_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 *st7567_initialize(FAR struct spi_dev_s *spi, unsigned int devno) { /* Configure and enable LCD */ FAR struct st7567_dev_s *priv = &g_st7567dev; ginfo("Initializing\n"); DEBUGASSERT(spi && devno == 0); /* Save the reference to the SPI device */ priv->spi = spi; /* Select and lock the device */ st7567_select(spi); /* Make sure that the OLED off */ st7567_power(0, false); /* Select command transfer */ SPI_CMDDATA(spi, SPIDEV_DISPLAY(0), true); /* Set the starting position for the run */ SPI_SEND(spi, ST7567_EXIT_SOFTRST); SPI_SEND(spi, ST7567_BIAS_1_7); SPI_SEND(spi, ST7567_DISPON); SPI_SEND(spi, SSD1305_MAPCOL0); SPI_SEND(spi, ST7567_SETCOMREVERSE); SPI_SEND(spi, ST7567_REG_RES_RR1); SPI_SEND(spi, ST7567_SETEV); SPI_SEND(spi, 0x32); SPI_SEND(spi, ST7567_POWERCTRL); SPI_SEND(spi, ST7567_SETSTARTLINE); SPI_SEND(spi, ST7567_SETPAGESTART); SPI_SEND(spi, ST7567_SETCOLH); SPI_SEND(spi, ST7567_SETCOLL); SPI_SEND(spi, ST7567_DISPON); SPI_SEND(spi, ST7567_DISPRAM); /* Let go of the SPI lock and de-select the device */ st7567_deselect(spi); /* Clear the framebuffer */ up_mdelay(100); up_clear(priv); return &priv->dev; }