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incubator-nuttx/drivers/lcd/pcd8544.c

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/**************************************************************************************
* drivers/lcd/pcd8544.c
*
* Driver for the Philips PCD8544 Display controller
*
* Copyright (C) 2017 Alan Carvalho de Assis. All rights reserved.
* Author: Alan Carvalho de Assis <acassis@gmail.com>
*
* Based on drivers/lcd/pcd8544.c.
*
* Copyright (C) 2013 Zilogic Systems. All rights reserved.
* Author: Manikandan <code@zilogic.com>
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************/
/**************************************************************************************
* Included Files
**************************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/spi/spi.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/lcd/pcd8544.h>
#include "pcd8544.h"
/**************************************************************************************
* Pre-processor Definitions
**************************************************************************************/
/* Configuration **********************************************************************/
/* PCD8544 Configuration Settings:
*
* CONFIG_PCD8544_SPIMODE - Controls the SPI mode
* CONFIG_PCD8544_FREQUENCY - Define to use a different bus frequency
* CONFIG_PCD8544_NINTERFACES - Specifies the number of physical
* PCD8544 devices that will be supported. NOTE: At present, this
* must be undefined or defined to be 1.
* CONFIG_LCD_PCD8544DEBUG - Enable detailed PCD8544 debug pcd8544 output
* (CONFIG_DEBUG_FEATURES and CONFIG_VERBOSE must also be enabled).
*
* Required LCD driver settings:
* CONFIG_LCD_PCD8544 - Enable PCD8544 support
* CONFIG_LCD_MAXCONTRAST should be 255, but any value >0 and <=255 will be accepted.
* CONFIG_LCD_MAXPOWER should be 1: 0=off, 1=normal
*
* Required SPI driver settings:
* CONFIG_SPI_CMDDATA - Include support for cmd/data selection.
*/
/* Verify that all configuration requirements have been met */
#ifndef CONFIG_PCD8544_SPIMODE
# define CONFIG_PCD8544_SPIMODE SPIDEV_MODE0
#endif
/* SPI frequency */
#ifndef CONFIG_PCD8544_FREQUENCY
# define CONFIG_PCD8544_FREQUENCY 3000000
#endif
/* CONFIG_PCD8544_NINTERFACES determines the number of physical interfaces
* that will be supported.
*/
#ifndef CONFIG_PCD8544_NINTERFACES
# define CONFIG_PCD8544_NINTERFACES 1
#endif
#if CONFIG_PCD8544_NINTERFACES != 1
# warning "Only a single PCD8544 interface is supported"
# undef CONFIG_PCD8544_NINTERFACES
# define CONFIG_PCD8544_NINTERFACES 1
#endif
/* Verbose debug pcd8544 must also be enabled to use the extra OLED debug pcd8544 */
#ifndef CONFIG_DEBUG_FEATURES
# undef CONFIG_DEBUG_INFO
# undef CONFIG_DEBUG_GRAPHICS
#endif
#ifndef CONFIG_DEBUG_INFO
# undef CONFIG_LCD_PCD8544DEBUG
#endif
/* Check contrast selection */
#ifndef CONFIG_LCD_MAXCONTRAST
# define CONFIG_LCD_MAXCONTRAST 127
#endif
#if CONFIG_LCD_MAXCONTRAST <= 0 || CONFIG_LCD_MAXCONTRAST > 127
# error "CONFIG_LCD_MAXCONTRAST exceeds supported maximum"
#endif
#if CONFIG_LCD_MAXCONTRAST < 60
# warning "Optimal setting of CONFIG_LCD_MAXCONTRAST is 60"
#endif
/* Check power setting */
#if !defined(CONFIG_LCD_MAXPOWER)
# define CONFIG_LCD_MAXPOWER 1
#endif
#if CONFIG_LCD_MAXPOWER != 1
# warning "CONFIG_LCD_MAXPOWER should be 1"
# undef CONFIG_LCD_MAXPOWER
# define CONFIG_LCD_MAXPOWER 1
#endif
/* The Display requires CMD/DATA SPI support */
#ifndef CONFIG_SPI_CMDDATA
# error "CONFIG_SPI_CMDDATA must be defined in your NuttX configuration"
#endif
/* Color Properties *******************************************************************/
/* The PCD8544 display controller can handle a resolution of 84x48.
*/
/* Display Resolution */
#ifdef CONFIG_PCD8544_XRES
#define PCD8544_XRES CONFIG_PCD8544_XRES
#else
#define PCD8544_XRES 84
#endif
#ifdef CONFIG_PCD8544_YRES
#define PCD8544_YRES CONFIG_PCD8544_YRES
#else
#define PCD8544_YRES 48
#endif
/* Color depth and format */
#define PCD8544_BPP 1
#define PCD8544_COLORFMT FB_FMT_Y1
/* Bytes per logical row and actual device row */
#define PCD8544_XSTRIDE (PCD8544_XRES >> 3) /* Pixels arrange "horizontally for user" */
#define PCD8544_YSTRIDE (PCD8544_YRES >> 3) /* But actual device arrangement is "vertical" */
/* The size of the shadow frame buffer */
#define PCD8544_FBSIZE (PCD8544_XRES * PCD8544_YSTRIDE)
/* Bit helpers */
#define LS_BIT (1 << 0)
#define MS_BIT (1 << 7)
/**************************************************************************************
* Private Type Definition
**************************************************************************************/
/* This structure describes the state of this driver */
struct pcd8544_dev_s
{
/* 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;
}
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