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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-05-23 Chushicheng the first version
*/
#include "drv_spi.h"
#include "drv_st7796.h"
#define LOG_TAG "drv.st7796"
#include <drv_log.h>
#ifndef ST7796_LCD_IPS_PANEL
#define ST7796_LCD_IPS_PANEL 1
#else
#define ST7796_LCD_IPS_PANEL 0
#endif
#define ST7796_INIT_SEQ_NAME(x) st7796_init_seq_##x##_480_320
#if ST7796_LCD_IPS_PANEL
#define ST7796_LCD_INIT_SEQ ST7796_INIT_SEQ_NAME(ips)
#else
#define ST7796_LCD_INIT_SEQ ST7796_INIT_SEQ_NAME(tft)
#endif
static st7796_t lcd_spi_obj;
static rt_err_t _st7796_init_seq(st7796_lcd_t *lcd);
static rt_err_t _st7796_window(st7796_lcd_t *lcd, rt_uint16_t x_start, rt_uint16_t x_end, rt_uint16_t y_start, rt_uint16_t y_end);
static rt_err_t _st7796_reset(st7796_lcd_t *lcd);
static rt_err_t st7796_lcd_load(st7796_lcd_t *lcd, void *data, rt_uint16_t x_start, rt_uint16_t x_end, rt_uint16_t y_start, rt_uint16_t y_end);
static rt_err_t st7796_lcd_sleep(st7796_lcd_t *lcd, rt_uint8_t sleep_mode);
static rt_err_t st7796_lcd_display(st7796_lcd_t *lcd, rt_uint8_t display_on);
static rt_err_t st7796_lcd_config(st7796_lcd_t *lcd, st7796_config_t *config);
void lcd_load(rt_uint16_t x_start, rt_uint16_t x_end, rt_uint16_t y_start, rt_uint16_t y_end, void *data);
static rt_uint8_t st7796_init_seq_tft_480_320[] =
{
0x01, 0xF0, 0xC3, /* Enable command part 1 */
0x01, 0xF0, 0x96, /* Enable command part 2*/
0x08, 0xE8, 0x40, 0x82, 0x07, 0x18, 0x27, 0x0A, 0xB6, 0x33, /* DOCA */
0x01, 0xC5, 0x27, /* VCOM control */
0x01, 0xC2, 0xA7, /* Power control 3 */
0x0E, 0xE0, 0xF0, 0x01, 0x06, 0x0F, 0x12, 0x1D, 0x36, 0x54, 0x44, 0x0C, 0x18, 0x16, 0x13, 0x15, /* PGC */
0x0E, 0xE1, 0xF0, 0x01, 0x05, 0x0A, 0x0B, 0x07, 0x32, 0x44, 0x44, 0x0C, 0x18, 0x17, 0x13, 0x16, /* NGC */
0x01, 0xF0, 0x3C, /* Disable command part 1 */
0x01, 0xF0, 0x69, /* Disable command part 2 */
};
static rt_uint8_t st7796_init_seq_ips_480_320[] =
{
0x01, 0xF0, 0xC3, /* Enable command part 1 */
0x01, 0xF0, 0x96, /* Enable command part 2 */
0x01, 0xB4, 0x01, /* Display inversion */
0x02, 0xB1, 0x80, 0x10, /* Frame rate control 1 */
0x04, 0xB5, 0x1F, 0x50, 0x00, 0x20, /* Blanking porch control */
0x03, 0xB6, 0x8A, 0x07, 0x3B, /* Display function control */
0x02, 0xC0, 0x80, 0x64, /* Power control 1 */
0x01, 0xC1, 0x13, /* Power control 2 */
0x01, 0xC2, 0xA7, /* Power control 3 */
0x01, 0xC5, 0x09, /* VCOM control */
0x08, 0xE8, 0x40, 0x8A, 0x00, 0x00, 0x29, 0x19, 0xA5, 0x33, /* DOCA */
0x0E, 0xE0, 0xF0, 0x06, 0x0B, 0x07, 0x06, 0x05, 0x2E, 0x33, 0x47, 0x3A, 0x17, 0x16, 0x2E, 0x31, /* PGC */
0x0E, 0xE1, 0xF0, 0x09, 0x0D, 0x09, 0x08, 0x23, 0x2E, 0x33, 0x46, 0x38, 0x13, 0x13, 0x2C, 0x32, /* NGC */
0x01, 0xF0, 0x3C, /* Disable command part 1 */
0x01, 0xF0, 0x69, /* Disable command part 2 */
};
static rt_err_t _st7796_init_seq(st7796_lcd_t *lcd)
{
rt_uint16_t i = 0;
while (i < sizeof(ST7796_LCD_INIT_SEQ))
{
if (lcd->cb.write_cmd_cb(lcd->user_data, &ST7796_LCD_INIT_SEQ[i + 1], ST7796_LCD_INIT_SEQ[i] + 1) != RT_EOK)
{
return -RT_ERROR;
};
i += ST7796_LCD_INIT_SEQ[i] + 2;
}
return RT_EOK;
}
static rt_err_t _st7796_window(st7796_lcd_t *lcd, rt_uint16_t x_start, rt_uint16_t x_end, rt_uint16_t y_start, rt_uint16_t y_end)
{
rt_uint16_t real_x_start, real_x_end, real_y_start, real_y_end;
rt_uint16_t x_offset, y_offset;
switch (lcd->config.direction)
{
case ST7796_DIR_0:
x_offset = 0;
y_offset = 0;
break;
case ST7796_DIR_90:
x_offset = 0;
y_offset = 0;
break;
case ST7796_DIR_180:
x_offset = 320;
y_offset = 480;
break;
case ST7796_DIR_270:
x_offset = 480;
y_offset = 320;
break;
default:
x_offset = 0;
y_offset = 0;
}
real_x_start = x_start + x_offset;
real_x_end = x_end + x_offset;
real_y_start = y_start + y_offset;
real_y_end = y_end + y_offset;
rt_uint8_t tx_buf[5] = {0x2A, ((rt_uint8_t)(real_x_start >> 0x08U) & 0xFFU), (real_x_start & 0xFFU),
((rt_uint8_t)(real_x_end >> 0x08U) & 0xFFU), (real_x_end & 0xFFU)};
if (lcd->cb.write_cmd_cb(lcd->user_data, tx_buf, 0x05) != RT_EOK)
{
return -RT_ERROR;
}
tx_buf[0] = 0x2B;
tx_buf[1] = ((rt_uint8_t)(real_y_start >> 0x08U) & 0xFFU);
tx_buf[2] = (real_y_start & 0xFFU);
tx_buf[3] = ((rt_uint8_t)(real_y_end >> 0x08U) & 0xFFU);
tx_buf[4] = (real_y_end & 0xFFU);
if (lcd->cb.write_cmd_cb(lcd->user_data, tx_buf, 0x05) != RT_EOK)
{
return -RT_ERROR;
}
return RT_EOK;
}
static rt_err_t _st7796_reset(st7796_lcd_t *lcd)
{
return lcd->cb.reset_cb(lcd->user_data);
}
static rt_err_t lcd_impl_reset(void *handle)
{
rt_pin_write(BSP_LCD_RST_PIN, PIN_LOW);
rt_thread_mdelay(50);
rt_pin_write(BSP_LCD_RST_PIN, PIN_HIGH);
rt_thread_mdelay(50);
return RT_EOK;
}
static rt_err_t st7796_lcd_init(st7796_lcd_t *lcd)
{
if (_st7796_reset(lcd) != RT_EOK) return -RT_ERROR;
if (_st7796_init_seq(lcd) != RT_EOK) return -RT_ERROR;
if (st7796_lcd_config(lcd, &lcd->config) != RT_EOK) return -RT_ERROR;
if (st7796_lcd_sleep(lcd, 0) != RT_EOK) return -RT_ERROR;
if (st7796_lcd_display(lcd, 1) != RT_EOK) return -RT_ERROR;
return RT_EOK;
}
static rt_err_t st7796_lcd_load(st7796_lcd_t *lcd, void *data, rt_uint16_t x_start, rt_uint16_t x_end, rt_uint16_t y_start, rt_uint16_t y_end)
{
rt_uint32_t pixel_count = (y_end - y_start + 1) * (x_end - x_start + 1);
rt_uint32_t data_len = 0;
switch (lcd->config.pix_fmt)
{
case ST7796_RGB444:
data_len = pixel_count * 3 / 2;
break;
case ST7796_RGB565:
data_len = pixel_count * 2;
break;
case ST7796_RGB666:
case ST7796_RGB888:
data_len = pixel_count * 3;
break;
default:
data_len = pixel_count;
break;
}
/* Set cursor */
if (_st7796_window(lcd, x_start, x_end, y_start, y_end) != RT_EOK)
{
return -RT_ERROR;
}
rt_uint8_t command = 0x2C; /* Memory Write */
if (lcd->cb.write_cmd_cb(lcd->user_data, &command, 0x01) != RT_EOK)
{
return -RT_ERROR;
}
/* Write pixel data */
if (lcd->cb.write_data_cb(lcd->user_data, data, data_len) != RT_EOK)
{
return -RT_ERROR;
}
return RT_EOK;
}
void lcd_load(rt_uint16_t x_start, rt_uint16_t x_end, rt_uint16_t y_start, rt_uint16_t y_end, void *data)
{
st7796_t *lcd_obj = (st7796_t *)rt_device_find("lcd");
st7796_lcd_load(&lcd_obj->st7796, data, x_start, x_end, y_start, y_end);
}
static rt_err_t st7796_lcd_sleep(st7796_lcd_t *lcd, rt_uint8_t sleep_mode)
{
/* Write SLPIN or SLPOUT command */
rt_uint8_t command = sleep_mode ? 0x10 : 0x11;
return lcd->cb.write_cmd_cb(lcd->user_data, &command, 0x01);
}
static rt_err_t st7796_lcd_display(st7796_lcd_t *lcd, rt_uint8_t display_on)
{
/* write display_on command */
rt_uint8_t command = display_on ? 0x29 : 0x28;
if (lcd->cb.write_cmd_cb(lcd->user_data, &command, 0x01) != RT_EOK)
{
return -RT_ERROR;
}
if ((lcd->cb.backlight_cb != NULL) && (lcd->cb.backlight_cb(lcd->user_data, display_on) != RT_EOK))
{
return -RT_ERROR;
}
return RT_EOK;
}
static rt_err_t st7796_lcd_config(st7796_lcd_t *lcd, st7796_config_t *config)
{
lcd->config.direction = config->direction;
/* Write inversion command */
rt_uint8_t command[2] = {config->inversion ? 0x20 : 0x21, 0x00};
if (lcd->cb.write_cmd_cb(lcd->user_data, command, 0x01) != RT_EOK)
{
return -RT_ERROR;
}
lcd->config.inversion = config->inversion;
command[0] = 0x3A;
command[1] = config->pix_fmt;
if (lcd->cb.write_cmd_cb(lcd->user_data, command, 0x02) != RT_EOK)
{
return -RT_ERROR;
}
lcd->config.pix_fmt = config->pix_fmt;
command[0] = 0x36;
command[1] = config->direction;
if (!config->bgr_mode)
{
command[1] &= ~0x08U;
}
if (config->mirrored)
{
/* Invert X or Y bit */
if (config->direction == ST7796_DIR_90 || config->direction == ST7796_DIR_270)
{
command[1] ^= 0x80U;
}
else
{
command[1] ^= 0x40U;
}
}
return lcd->cb.write_cmd_cb(lcd->user_data, command, 0x02);
}
static rt_err_t lcd_impl_write_cmd(void *handle, rt_uint8_t *cmd, rt_uint8_t len)
{
st7796_t *nxp_lcd = (st7796_t*)handle;
rt_pin_write(BSP_LCD_DC_PIN, PIN_LOW);
rt_spi_send(nxp_lcd->spi_dev, cmd, 1);
if (len > 1)
{
rt_pin_write(BSP_LCD_DC_PIN, PIN_HIGH);
rt_spi_send(nxp_lcd->spi_dev, &cmd[1], len-1);
}
return RT_EOK;
}
static rt_err_t lcd_impl_write_data(void *handle, void *data, rt_uint32_t len)
{
st7796_t *nxp_lcd = (st7796_t*)handle;
rt_pin_write(BSP_LCD_DC_PIN, PIN_HIGH);
rt_spi_send(nxp_lcd->spi_dev, data, len);
return RT_EOK;
}
int drv_st7796_init(void)
{
rt_pin_mode(BSP_LCD_RST_PIN, PIN_MODE_OUTPUT);
rt_pin_mode(BSP_LCD_DC_PIN, PIN_MODE_OUTPUT);
rt_pin_write(BSP_LCD_RST_PIN, PIN_HIGH);
lcd_spi_obj.st7796.config.direction = ST7796_DIR_90;
lcd_spi_obj.st7796.config.pix_fmt = ST7796_RGB565;
lcd_spi_obj.st7796.config.bgr_mode = 1;
lcd_spi_obj.st7796.config.inversion = 0;
lcd_spi_obj.st7796.config.mirrored = 1;
lcd_spi_obj.st7796.cb.reset_cb = lcd_impl_reset;
lcd_spi_obj.st7796.cb.write_cmd_cb = lcd_impl_write_cmd;
lcd_spi_obj.st7796.cb.write_data_cb = lcd_impl_write_data;
lcd_spi_obj.st7796.user_data = lcd_spi_obj.parent.user_data = &lcd_spi_obj;
rt_hw_spi_device_attach(BSP_LCD_SPI_BUS, LCD_DEVICE_NAME, BSP_LCD_CS_PIN);
lcd_spi_obj.spi_dev = (struct rt_spi_device *)rt_device_find(LCD_DEVICE_NAME);
if (!lcd_spi_obj.spi_dev)
{
LOG_E("lcd init run failed! can't find %s device!", LCD_DEVICE_NAME);
return -RT_ERROR;
}
struct rt_spi_configuration cfg;
cfg.data_width = 8;
cfg.mode = RT_SPI_MODE_0 | RT_SPI_MSB; /* SPI Compatible: Mode 0 and Mode 3 */
cfg.max_hz = 10 * 1000 * 1000; /* 10M */
rt_spi_configure(lcd_spi_obj.spi_dev, &cfg);
st7796_lcd_init(&lcd_spi_obj.st7796);
rt_device_register(&lcd_spi_obj.parent, "lcd", RT_DEVICE_FLAG_RDWR);
return RT_EOK;
}
INIT_ENV_EXPORT(drv_st7796_init);
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