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nuttx/drivers/lcd/st7735.c

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/****************************************************************************
* drivers/lcd/st7735.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <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/st7735.h>
#include "st7735.h"
#ifdef CONFIG_LCD_ST7735
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Verify that all configuration requirements have been met */
#ifndef CONFIG_LCD_ST7735_SPIMODE
# define CONFIG_LCD_ST7735_SPIMODE SPIDEV_MODE0
#endif
/* SPI frequency */
#ifndef CONFIG_LCD_ST7735_FREQUENCY
# define CONFIG_LCD_ST7735_FREQUENCY 3000000
#endif
/* Check contrast selection */
#if !defined(CONFIG_LCD_MAXCONTRAST)
# define CONFIG_LCD_MAXCONTRAST 1
#endif
/* Check power setting */
#if !defined(CONFIG_LCD_MAXPOWER) || CONFIG_LCD_MAXPOWER < 1
# define CONFIG_LCD_MAXPOWER 1
#endif
#if CONFIG_LCD_MAXPOWER > 255
# error "CONFIG_LCD_MAXPOWER must be less than 256 to fit in uint8_t"
#endif
/* Check orientation */
#if defined(CONFIG_LCD_PORTRAIT)
# if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE) ||\
defined(CONFIG_LCD_RPORTRAIT)
# error "Cannot define both portrait and any other orientations"
# endif
#elif defined(CONFIG_LCD_RPORTRAIT)
# if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
# error "Cannot define both rportrait and any other orientations"
# endif
#elif defined(CONFIG_LCD_LANDSCAPE)
# ifdef CONFIG_LCD_RLANDSCAPE
# error "Cannot define both landscape and any other orientations"
# endif
#elif !defined(CONFIG_LCD_RLANDSCAPE)
# define CONFIG_LCD_LANDSCAPE 1
#endif
/* Display Resolution */
#ifdef CONFIG_LCD_ST7735_GM00
# define CONFIG_ST7735_XRES 132
# define CONFIG_ST7735_YRES 162
# define ST7735_LUT_SIZE 162
#else
# define CONFIG_ST7735_XRES 128
# define CONFIG_ST7735_YRES 160
# define ST7735_LUT_SIZE 160
#endif
#if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
# define ST7735_XRES CONFIG_ST7735_YRES
# define ST7735_YRES CONFIG_ST7735_XRES
#else
# define ST7735_XRES CONFIG_ST7735_XRES
# define ST7735_YRES CONFIG_ST7735_YRES
#endif
/* Color depth and format */
#ifdef CONFIG_LCD_ST7735_BPP
# if (CONFIG_LCD_ST7735_BPP == 12)
# define ST7735_BPP 12
# define ST7735_COLORFMT FB_FMT_RGB12_444
# define ST7735_BYTESPP 2
# elif (CONFIG_LCD_ST7735_BPP == 16)
# define ST7735_BPP 16
# define ST7735_COLORFMT FB_FMT_RGB16_565
# define ST7735_BYTESPP 2
# elif (CONFIG_LCD_ST7735_BPP == 18)
# define ST7735_BPP 18
# define ST7735_COLORFMT FB_FMT_RGB16_666
# define ST7735_BYTESPP 3
# else
# define ST7735_BPP 16
# define ST7735_COLORFMT FB_FMT_RGB16_565
# define ST7735_BYTESPP 2
# warning "Invalid color depth. Falling back to 16bpp"
# endif
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure describes the state of this driver */
struct st7735_dev_s
{
/* Publicly visible device structure */
struct lcd_dev_s dev;
/* Private LCD-specific information follows */
FAR struct spi_dev_s *spi; /* SPI device */
uint8_t bpp; /* Selected color depth */
uint8_t power; /* Current power setting */
/* This is working memory allocated by the LCD driver for each LCD device
* and for each color plane. This memory will hold one raster line of data.
* The size of the allocated run buffer must therefore be at least
* (bpp * xres / 8). Actual alignment of the buffer must conform to the
* bitwidth of the underlying pixel type.
*
* If there are multiple planes, they may share the same working buffer
* because different planes will not be operate on concurrently. However,
* if there are multiple LCD devices, they must each have unique run
* buffers.
*/
uint16_t runbuffer[ST7735_LUT_SIZE];
};
/****************************************************************************
* Private Function Protototypes
****************************************************************************/
/* Misc. Helpers */
static void st7735_select(FAR struct spi_dev_s *spi, int bits);
static void st7735_deselect(FAR struct spi_dev_s *spi);
static inline void st7735_sendcmd(FAR struct st7735_dev_s *dev, uint8_t cmd);
static void st7735_sleep(FAR struct st7735_dev_s *dev, bool sleep);
static void st7735_display(FAR struct st7735_dev_s *dev, bool on);
static void st7735_setarea(FAR struct st7735_dev_s *dev,
uint16_t x0, uint16_t y0,
uint16_t x1, uint16_t y1);
static void st7735_bpp(FAR struct st7735_dev_s *dev, int bpp);
static void st7735_wrram(FAR struct st7735_dev_s *dev,
FAR const uint16_t *buff, size_t size);
static void st7735_rdram(FAR struct st7735_dev_s *dev,
FAR uint16_t *buff, size_t size);
static void st7735_fill(FAR struct st7735_dev_s *dev, uint16_t color);
/* LCD Data Transfer Methods */
static int st7735_putrun(fb_coord_t row, fb_coord_t col,
FAR const uint8_t *buffer, size_t npixels);
#ifndef CONFIG_LCD_NOGETRUN
static int st7735_getrun(fb_coord_t row, fb_coord_t col,
FAR uint8_t *buffer, size_t npixels);
#endif
/* LCD Configuration */
static int st7735_getvideoinfo(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo);
static int st7735_getplaneinfo(FAR struct lcd_dev_s *dev,
unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo);
/* LCD Specific Controls */
static int st7735_getpower(FAR struct lcd_dev_s *dev);
static int st7735_setpower(FAR struct lcd_dev_s *dev, int power);
static int st7735_getcontrast(FAR struct lcd_dev_s *dev);
static int st7735_setcontrast(FAR struct lcd_dev_s *dev,
unsigned int contrast);
/****************************************************************************
* Private Data
****************************************************************************/
static struct st7735_dev_s g_lcddev;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: st7735_select
*
* Description:
* Select the SPI, locking and re-configuring if necessary
*
* Input Parameters:
* spi - Reference to the SPI driver structure
* bits - Number of SPI bits
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void st7735_select(FAR struct spi_dev_s *spi, int bits)
{
/* Select ST7735 chip (locking the SPI bus in case there are multiple
* devices competing for the SPI bus
*/
SPI_LOCK(spi, true);
SPI_SELECT(spi, SPIDEV_DISPLAY(0), true);
/* Now make sure that the SPI bus is configured for the ST7735 (it
* might have gotten configured for a different device while unlocked)
*/
SPI_SETMODE(spi, CONFIG_LCD_ST7735_SPIMODE);
SPI_SETBITS(spi, bits);
SPI_SETFREQUENCY(spi, CONFIG_LCD_ST7735_FREQUENCY);
}
/****************************************************************************
* Name: st7735_deselect
*
* Description:
* De-select the SPI
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void st7735_deselect(FAR struct spi_dev_s *spi)
{
/* De-select ST7735 chip and relinquish the SPI bus. */
SPI_SELECT(spi, SPIDEV_DISPLAY(0), false);
SPI_LOCK(spi, false);
}
/****************************************************************************
* Name: st7735_sendcmd
*
* Description:
* Send a command to the driver.
*
****************************************************************************/
static inline void st7735_sendcmd(FAR struct st7735_dev_s *dev, uint8_t cmd)
{
st7735_select(dev->spi, 8);
SPI_CMDDATA(dev->spi, SPIDEV_DISPLAY(0), true);
SPI_SEND(dev->spi, cmd);
SPI_CMDDATA(dev->spi, SPIDEV_DISPLAY(0), false);
st7735_deselect(dev->spi);
}
/****************************************************************************
* Name: st7735_sleep
*
* Description:
* Sleep or wake up the driver.
*
****************************************************************************/
static void st7735_sleep(FAR struct st7735_dev_s *dev, bool sleep)
{
st7735_sendcmd(dev, sleep ? ST7735_SLPIN : ST7735_SLPOUT);
up_mdelay(120);
}
/****************************************************************************
* Name: st7735_display
*
* Description:
* Turn on or off the display.
*
****************************************************************************/
static void st7735_display(FAR struct st7735_dev_s *dev, bool on)
{
st7735_sendcmd(dev, on ? ST7735_DISPON : ST7735_DISPOFF);
}
/****************************************************************************
* Name: st7735_setarea
*
* Description:
* Set the rectangular area for an upcomming read or write from RAM.
*
****************************************************************************/
static void st7735_setarea(FAR struct st7735_dev_s *dev,
uint16_t x0, uint16_t y0,
uint16_t x1, uint16_t y1)
{
/* Set row address */
st7735_sendcmd(dev, ST7735_RASET);
st7735_select(dev->spi, 16);
SPI_SEND(dev->spi, y0);
SPI_SEND(dev->spi, y1);
st7735_deselect(dev->spi);
/* Set column address */
st7735_sendcmd(dev, ST7735_CASET);
st7735_select(dev->spi, 16);
SPI_SEND(dev->spi, x0);
SPI_SEND(dev->spi, x1);
st7735_deselect(dev->spi);
}
/****************************************************************************
* Name: st7735_bpp
*
* Description:
* Set the color depth of the device.
*
****************************************************************************/
static void st7735_bpp(FAR struct st7735_dev_s *dev, int bpp)
{
uint8_t depth;
/* Don't send any command if the depth hasn't changed. */
if (dev->bpp != bpp)
{
/* REVISIT: Works only for 12 and 16 bpp! */
depth = bpp >> 2 | 1;
st7735_sendcmd(dev, ST7735_COLMOD);
st7735_select(dev->spi, 8);
SPI_SEND(dev->spi, depth);
st7735_deselect(dev->spi);
/* Cache the new BPP */
dev->bpp = bpp;
}
}
/****************************************************************************
* Name: st7735_wrram
*
* Description:
* Write to the driver's RAM.
*
****************************************************************************/
static void st7735_wrram(FAR struct st7735_dev_s *dev,
FAR const uint16_t *buff, size_t size)
{
st7735_sendcmd(dev, ST7735_RAMWR);
st7735_select(dev->spi, ST7735_BYTESPP * 8);
SPI_SNDBLOCK(dev->spi, buff, size);
st7735_deselect(dev->spi);
}
/****************************************************************************
* Name: st7735_rdram
*
* Description:
* Read from the driver's RAM.
*
****************************************************************************/
static void st7735_rdram(FAR struct st7735_dev_s *dev,
FAR uint16_t *buff, size_t size)
{
st7735_sendcmd(dev, ST7735_RAMRD);
st7735_select(dev->spi, ST7735_BYTESPP * 8);
SPI_RECVBLOCK(dev->spi, buff, size);
st7735_deselect(dev->spi);
}
/****************************************************************************
* Name: st7735_fill
*
* Description:
* Fill the display with the specified color.
*
****************************************************************************/
static void st7735_fill(FAR struct st7735_dev_s *dev, uint16_t color)
{
int i;
st7735_setarea(dev, 0, 0, ST7735_XRES - 1, ST7735_YRES - 1);
st7735_sendcmd(dev, ST7735_RAMWR);
st7735_select(dev->spi, ST7735_BYTESPP * 8);
for (i = 0; i < ST7735_XRES * ST7735_YRES; i++)
{
SPI_SEND(dev->spi, color);
}
st7735_deselect(dev->spi);
}
/****************************************************************************
* Name: st7735_putrun
*
* Description:
* This method can be used to write a partial raster line to the LCD:
*
* row - Starting row to write to (range: 0 <= row < yres)
* col - Starting column to write to (range: 0 <= col <= xres-npixels)
* buffer - The buffer containing the run to be written to the LCD
* npixels - The number of pixels to write to the LCD
* (range: 0 < npixels <= xres-col)
*
****************************************************************************/
static int st7735_putrun(fb_coord_t row, fb_coord_t col,
FAR const uint8_t *buffer, size_t npixels)
{
FAR struct st7735_dev_s *priv = &g_lcddev;
FAR const uint16_t *src = (FAR const uint16_t *)buffer;
ginfo("row: %d col: %d npixels: %d\n", row, col, npixels);
DEBUGASSERT(buffer && ((uintptr_t)buffer & 1) == 0);
st7735_setarea(priv, col, row, col + npixels - 1, row);
st7735_wrram(priv, src, npixels);
return OK;
}
/****************************************************************************
* Name: st7735_getrun
*
* Description:
* This method can be used to read a partial raster line from the LCD:
*
* row - Starting row to read from (range: 0 <= row < yres)
* col - Starting column to read read (range: 0 <= col <= xres-npixels)
* buffer - The buffer in which to return the run read from the LCD
* npixels - The number of pixels to read from the LCD
* (range: 0 < npixels <= xres-col)
*
****************************************************************************/
#ifndef CONFIG_LCD_NOGETRUN
static int st7735_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
size_t npixels)
{
FAR struct st7735_dev_s *priv = &g_lcddev;
FAR uint16_t *dest = (FAR uint16_t *)buffer;
ginfo("row: %d col: %d npixels: %d\n", row, col, npixels);
DEBUGASSERT(buffer && ((uintptr_t)buffer & 1) == 0);
st7735_setarea(priv, col, row, col + npixels - 1, row);
st7735_rdram(priv, dest, npixels);
return OK;
}
#endif
/****************************************************************************
* Name: st7735_getvideoinfo
*
* Description:
* Get information about the LCD video controller configuration.
*
****************************************************************************/
static int st7735_getvideoinfo(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo)
{
DEBUGASSERT(dev && vinfo);
lcdinfo("fmt: %d xres: %d yres: %d nplanes: 1\n",
ST7735_COLORFMT, ST7735_XRES, ST7735_YRES);
vinfo->fmt = ST7735_COLORFMT; /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */
vinfo->xres = ST7735_XRES; /* Horizontal resolution in pixel columns */
vinfo->yres = ST7735_YRES; /* Vertical resolution in pixel rows */
vinfo->nplanes = 1; /* Number of color planes supported */
return OK;
}
/****************************************************************************
* Name: st7735_getplaneinfo
*
* Description:
* Get information about the configuration of each LCD color plane.
*
****************************************************************************/
static int st7735_getplaneinfo(FAR struct lcd_dev_s *dev,
unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo)
{
FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev;
DEBUGASSERT(dev && pinfo && planeno == 0);
lcdinfo("planeno: %d bpp: %d\n", planeno, ST7735_BPP);
pinfo->putrun = st7735_putrun; /* Put a run into LCD memory */
#ifndef CONFIG_LCD_NOGETRUN
pinfo->getrun = st7735_getrun; /* Get a run from LCD memory */
#endif
pinfo->buffer = (FAR uint8_t *)priv->runbuffer; /* Run scratch buffer */
pinfo->bpp = priv->bpp; /* Bits-per-pixel */
return OK;
}
/****************************************************************************
* Name: st7735_getpower
****************************************************************************/
static int st7735_getpower(FAR struct lcd_dev_s *dev)
{
FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev;
lcdinfo("power: %d\n", priv->power);
return priv->power;
}
/****************************************************************************
* Name: st7735_setpower
****************************************************************************/
static int st7735_setpower(FAR struct lcd_dev_s *dev, int power)
{
FAR struct st7735_dev_s *priv = (FAR struct st7735_dev_s *)dev;
lcdinfo("power: %d\n", power);
DEBUGASSERT((unsigned)power <= CONFIG_LCD_MAXPOWER);
/* Set new power level */
if (power > 0)
{
/* Turn on the display */
st7735_display(priv, true);
/* Save the power */
priv->power = power;
}
else
{
/* Turn off the display */
st7735_display(priv, false);
/* Save the power */
priv->power = 0;
}
return OK;
}
/****************************************************************************
* Name: st7735_getcontrast
*
* Description:
* Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
*
****************************************************************************/
static int st7735_getcontrast(FAR struct lcd_dev_s *dev)
{
lcdinfo("Not implemented\n");
return -ENOSYS;
}
/****************************************************************************
* Name: st7735_setcontrast
*
* Description:
* Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
*
****************************************************************************/
static int st7735_setcontrast(FAR struct lcd_dev_s *dev,
unsigned int contrast)
{
lcdinfo("contrast: %d\n", contrast);
return -ENOSYS;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: st7735_initialize
*
* Description:
* Initialize the ST7735 video hardware. The initial state of the
* LCD is fully initialized, display memory cleared, and the LCD ready
* to use, but with the power setting at 0 (full off == sleep mode).
*
* Returned Value:
*
* On success, this function returns a reference to the LCD object for
* the specified LCD. NULL is returned on any failure.
*
****************************************************************************/
FAR struct lcd_dev_s *st7735_lcdinitialize(FAR struct spi_dev_s *spi)
{
FAR struct st7735_dev_s *priv = &g_lcddev;
/* Initialize the driver data structure */
priv->dev.getvideoinfo = st7735_getvideoinfo;
priv->dev.getplaneinfo = st7735_getplaneinfo;
priv->dev.getpower = st7735_getpower;
priv->dev.setpower = st7735_setpower;
priv->dev.getcontrast = st7735_getcontrast;
priv->dev.setcontrast = st7735_setcontrast;
priv->spi = spi;
/* Init the hardware and clear the display */
st7735_sleep(priv, false);
st7735_bpp(priv, ST7735_BPP);
st7735_display(priv, true);
st7735_fill(priv, 0xffff);
return &priv->dev;
}
#endif /* CONFIG_LCD_ST7735 */
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