Stm32 st7793屏幕驱动
时间: 2023-06-26 10:04:31 浏览: 559
ST7793是一款高性能的液晶显示控制器,可用于驱动TFT-LCD屏幕。要在STM32上使用ST7793屏幕,您可以使用STM32的外部总线接口(例如SPI或FSMC)来与ST7793进行通信。
以下是ST7793屏幕的一些基本特性:
- 分辨率:240x320
- 颜色深度:18位(262K色)
- 控制接口:SPI或8080并行接口
- 工作电压:2.5V至3.6V
- 工作温度:-20°C至70°C
下面是一个简单的示例代码,演示如何使用STM32的SPI总线与ST7793屏幕进行通信。请注意,具体的代码实现可能因硬件平台和库的选择而有所不同。
```c
#include "stm32f10x.h"
#include "stm32f10x_spi.h"
// 定义ST7793的命令和寄存器地址
#define ST7793_CMD_SWRESET 0x01
#define ST7793_CMD_SLPOUT 0x11
#define ST7793_CMD_COLMOD 0x3A
#define ST7793_CMD_MADCTL 0x36
#define ST7793_CMD_CASET 0x2A
#define ST7793_CMD_RASET 0x2B
#define ST7793_CMD_RAMWR 0x2C
#define ST7793_MADCTL_MY 0x80
#define ST7793_MADCTL_MX 0x40
#define ST7793_MADCTL_MV 0x20
#define ST7793_MADCTL_RGB 0x00
#define ST7793_MADCTL_BGR 0x08
#define ST7793_MADCTL_ML 0x10
#define ST7793_MADCTL_MH 0x04
// 初始化SPI总线
void init_spi(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
// 发送一个字节到SPI总线
void spi_send_byte(uint8_t data)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
;
SPI_I2S_SendData(SPI1, data);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
;
SPI_I2S_ReceiveData(SPI1);
}
// 发送一个命令字节到ST7793
void st7793_send_cmd(uint8_t cmd)
{
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
spi_send_byte(cmd);
GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
// 发送一个数据字节到ST7793
void st7793_send_data(uint8_t data)
{
GPIO_SetBits(GPIOA, GPIO_Pin_4);
spi_send_byte(data);
}
// 初始化ST7793屏幕
void st7793_init(void)
{
// 复位ST7793
st7793_send_cmd(ST7793_CMD_SWRESET);
delay_ms(5);
// 退出休眠模式
st7793_send_cmd(ST7793_CMD_SLPOUT);
delay_ms(5);
// 设置颜色模式为18位
st7793_send_cmd(ST7793_CMD_COLMOD);
st7793_send_data(0x06);
// 设置扫描方向为从左到右、从上到下
st7793_send_cmd(ST7793_CMD_MADCTL);
st7793_send_data(ST7793_MADCTL_MY | ST7793_MADCTL_BGR);
// 设置RAM地址范围
st7793_send_cmd(ST7793_CMD_CASET);
st7793_send_data(0x00);
st7793_send_data(0x00);
st7793_send_data(0x00);
st7793_send_data(0xEF);
st7793_send_cmd(ST7793_CMD_RASET);
st7793_send_data(0x00);
st7793_send_data(0x00);
st7793_send_data(0x01);
st7793_send_data(0x3F);
// 打开RAM写入模式
st7793_send_cmd(ST7793_CMD_RAMWR);
}
// 在ST7793屏幕上绘制一个像素点
void st7793_draw_pixel(uint16_t x, uint16_t y, uint16_t color)
{
st7793_send_cmd(ST7793_CMD_CASET);
st7793_send_data(x >> 8);
st7793_send_data(x & 0xFF);
st7793_send_data((x + 1) >> 8);
st7793_send_data((x + 1) & 0xFF);
st7793_send_cmd(ST7793_CMD_RASET);
st7793_send_data(y >> 8);
st7793_send_data(y & 0xFF);
st7793_send_data((y + 1) >> 8);
st7793_send_data((y + 1) & 0xFF);
st7793_send_cmd(ST7793_CMD_RAMWR);
st7793_send_data(color >> 8);
st7793_send_data(color & 0xFF);
}
```
这只是一个简单的示例代码,您需要根据自己的具体情况进行修改。此外,还需要连接ST7793屏幕和STM32控制器,并使用适当的电平转换器将它们连接起来。
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