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incubator-nuttx/drivers/lcd/st7565.c

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/****************************************************************************
* drivers/lcd/st7565.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.
*
****************************************************************************/
/* Reference: "Product Specification, OEL Display Module, ST7567", Univision
* Technology Inc., SAS1-6020-B, January 3, 2008.
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/spi/spi.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/lcd/st7565.h>
#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_FEATURES 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_FEATURES
# undef CONFIG_DEBUG_INFO
# undef CONFIG_DEBUG_GRAPHICS
#endif
#ifndef CONFIG_DEBUG_INFO
# 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
/* 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)
/****************************************************************************
* 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(FAR struct lcd_dev_s *dev, fb_coord_t row,
fb_coord_t col, FAR const uint8_t *buffer,
size_t npixels);
static int st7565_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 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 = (FAR 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:
*
* 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 st7565_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 st7565_dev_s *priv = (FAR struct st7565_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)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_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 */
st7565_select(priv);
/* Select command transfer */
st7565_cmddata(priv, true);
/* Set the starting position for the run */
st7565_send_one_data(priv, ST7565_SETPAGESTART + page);
st7565_send_one_data(priv, ST7565_SETCOLL + (col & 0x0f));
st7565_send_one_data(priv, ST7565_SETCOLH + (col >> 4));
/* Select data transfer */
st7565_cmddata(priv, false);
/* Then transfer all of the data */
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(FAR struct lcd_dev_s *dev, fb_coord_t row,
fb_coord_t col, FAR uint8_t *buffer,
size_t npixels)
{
FAR struct st7565_dev_s *priv = (FAR struct st7565_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)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_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: 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);
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: 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);
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: 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);
ginfo("powered: %d\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);
ginfo("power: %d powered: %d\n", power, priv->power_level);
/* Select and lock the device */
st7565_select(priv);
st7565_cmddata(priv, true);
if (power <= 0)
{
/* Turn the display off */
st7565_send_one_data(priv, ST7565_DISPOFF);
st7565_backlight(priv, 0);
priv->power_level = 0;
}
else
{
st7565_send_one_data(priv, ST7565_DISPON);
st7565_send_one_data(priv, ST7565_DISPRAM);
/* Don't use value 1 of backlight to allow low power mode */
if (power == 1)
{
st7565_backlight(priv, 0);
}
else
{
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;
ginfo("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 */
st7565_send_one_data(priv, ST7565_SETEVMODE);
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 */
st7565_send_one_data(priv, ST7565_SETPAGESTART + i);
st7565_send_one_data(priv, ST7565_SETCOLL);
st7565_send_one_data(priv, ST7565_SETCOLH);
/* Select data transfer */
st7565_cmddata(priv, false);
/* Then transfer all 96 columns of data */
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;
ginfo("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 implemented */
st7565_send_one_data(priv, ST7565_EXIT_SOFTRST);
/* Follow NHD-C12864KGZ DISPLAY INITIALIZATION... */
#if defined(CONFIG_NHD_C12864KGZ)
st7565_send_one_data(priv, ST7565_BIAS_1_9);
st7565_send_one_data(priv, ST7565_REG_RES_5_5);
st7565_send_one_data(priv, ST7565_SETEVMODE);
st7565_send_one_data(priv, ST7565_SETEVREG(15));
st7565_send_one_data(priv, ST7565_POWERCTRL_INT);
st7565_send_one_data(priv, ST7565_SETSTARTLINE);
#elif defined(CONFIG_ERC_12864_3)
st7565_send_one_data(priv, ST7565_ADCNORMAL);
st7565_send_one_data(priv, ST7565_SETCOMREVERSE);
st7565_send_one_data(priv, ST7565_BIAS_1_9);
st7565_send_one_data(priv, ST7565_POWERCTRL_INT);
st7565_send_one_data(priv, ST7565_REG_RES_5_5);
st7565_send_one_data(priv, ST7565_SETEVMODE);
st7565_send_one_data(priv, ST7565_SETEVREG(0x24));
st7565_send_one_data(priv, ST7565_SETSTARTLINE);
#elif defined(CONFIG_AQM_1248A)
st7565_send_one_data(priv, ST7565_DISPOFF);
st7565_send_one_data(priv, ST7565_ADCNORMAL);
st7565_send_one_data(priv, ST7565_SETCOMREVERSE);
st7565_send_one_data(priv, ST7565_BIAS_1_7);
st7565_send_one_data(priv, ST7565_POWERCTRL_B);
up_mdelay(2);
st7565_send_one_data(priv, ST7565_POWERCTRL_BR);
up_mdelay(2);
st7565_send_one_data(priv, ST7565_POWERCTRL_INT);
st7565_send_one_data(priv, ST7565_REG_RES_4_5);
st7565_send_one_data(priv, ST7565_SETEVMODE);
st7565_send_one_data(priv, ST7565_SETEVREG(0x1c));
st7565_send_one_data(priv, ST7565_DISPRAM);
st7565_send_one_data(priv, ST7565_SETSTARTLINE);
st7565_send_one_data(priv, ST7565_DISPNORMAL);
st7565_send_one_data(priv, ST7565_DISPON);
#else
# error "No initialization sequence selected"
#endif
#if 0
st7565_send_one_data(priv, ST7565_DISPON);
st7565_send_one_data(priv, ST7565_SETCOMREVERSE);
st7565_send_one_data(priv, ST7565_REG_RES_RR1);
st7565_send_one_data(priv, ST7565_SETEV);
st7565_send_one_data(priv, 0x32);
st7565_send_one_data(priv, ST7565_POWERCTRL);
st7565_send_one_data(priv, ST7565_SETSTARTLINE);
st7565_send_one_data(priv, ST7565_SETPAGESTART);
st7565_send_one_data(priv, ST7565_SETCOLH);
st7565_send_one_data(priv, ST7565_SETCOLL);
st7565_send_one_data(priv, ST7565_DISPON);
st7565_send_one_data(priv, ST7565_DISPRAM);
#endif
#ifdef CONFIG_ST7565_MIRROR_X
st7565_send_one_data(priv, ST7565_ADCINVERSE);
#else
st7565_send_one_data(priv, ST7565_ADCNORMAL);
#endif
#ifdef CONFIG_ST7565_MIRROR_Y
st7565_send_one_data(priv, ST7565_SETCOMREVERSE);
#else
st7565_send_one_data(priv, ST7565_SETCOMNORMAL);
#endif
#ifdef CONFIG_ST7565_INVERSE_VIDEO
st7565_send_one_data(priv, ST7565_DISPINVERSE);
#else
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;
}
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