stm32f4实现串口屏通信
时间: 2023-09-30 17:05:40 浏览: 63
实现stm32f4与串口屏的通信需要以下几个步骤:
1. 配置串口:首先需要配置stm32f4的串口通信,包括串口波特率、数据位、停止位和校验位等参数。
2. 初始化串口:使用HAL库或者底层驱动代码初始化串口,使串口能够正常工作。
3. 发送数据:使用串口发送数据给串口屏,可以使用printf函数或者HAL库提供的串口发送函数等。
4. 接收数据:接收串口屏返回的数据,可以使用HAL库提供的串口接收函数等。
5. 处理数据:根据串口屏返回的数据进行相应的处理,例如更新显示内容等。
以下是一个简单的示例代码,实现了stm32f4与串口屏的通信:
```c
#include <stdio.h>
#include "stm32f4xx.h"
#define LCD_WIDTH 320
#define LCD_HEIGHT 240
void init_uart(void);
void send_cmd(uint8_t cmd);
void send_data(uint8_t data);
void lcd_clear(void);
void lcd_draw_pixel(uint16_t x, uint16_t y, uint16_t color);
void lcd_draw_line(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color);
int main(void)
{
uint16_t i;
// 初始化串口
init_uart();
// 清屏
lcd_clear();
// 画线
lcd_draw_line(0, 0, LCD_WIDTH - 1, LCD_HEIGHT - 1, 0xFFFF);
lcd_draw_line(0, LCD_HEIGHT - 1, LCD_WIDTH - 1, 0, 0xFFFF);
while (1) {
// 等待串口屏返回数据
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
uint8_t data = USART_ReceiveData(USART2);
// 处理数据
switch (data) {
case 0x01: // 清屏
lcd_clear();
break;
case 0x02: // 画线
uint16_t x1, y1, x2, y2, color;
// 接收参数
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
x1 = USART_ReceiveData(USART2);
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
x1 |= USART_ReceiveData(USART2) << 8;
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
y1 = USART_ReceiveData(USART2);
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
y1 |= USART_ReceiveData(USART2) << 8;
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
x2 = USART_ReceiveData(USART2);
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
x2 |= USART_ReceiveData(USART2) << 8;
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
y2 = USART_ReceiveData(USART2);
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
y2 |= USART_ReceiveData(USART2) << 8;
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
color = USART_ReceiveData(USART2);
while (!USART_GetFlagStatus(USART2, USART_FLAG_RXNE));
color |= USART_ReceiveData(USART2) << 8;
// 画线
lcd_draw_line(x1, y1, x2, y2, color);
break;
default:
break;
}
}
}
void init_uart(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef USART_InitStruct;
// 使能USART2和GPIOA的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置PA2为TX和PA3为RX
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// 配置USART2
USART_InitStruct.USART_BaudRate = 115200;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART2, &USART_InitStruct);
// 使能USART2
USART_Cmd(USART2, ENABLE);
}
void send_cmd(uint8_t cmd)
{
while (!USART_GetFlagStatus(USART2, USART_FLAG_TXE));
USART_SendData(USART2, 0x00);
while (!USART_GetFlagStatus(USART2, USART_FLAG_TXE));
USART_SendData(USART2, cmd);
}
void send_data(uint8_t data)
{
while (!USART_GetFlagStatus(USART2, USART_FLAG_TXE));
USART_SendData(USART2, 0x01);
while (!USART_GetFlagStatus(USART2, USART_FLAG_TXE));
USART_SendData(USART2, data);
}
void lcd_clear(void)
{
send_cmd(0x01);
}
void lcd_draw_pixel(uint16_t x, uint16_t y, uint16_t color)
{
send_cmd(0x02);
send_data(x & 0xFF);
send_data((x >> 8) & 0xFF);
send_data(y & 0xFF);
send_data((y >> 8) & 0xFF);
send_data(color & 0xFF);
send_data((color >> 8) & 0xFF);
}
void lcd_draw_line(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
send_cmd(0x03);
send_data(x1 & 0xFF);
send_data((x1 >> 8) & 0xFF);
send_data(y1 & 0xFF);
send_data((y1 >> 8) & 0xFF);
send_data(x2 & 0xFF);
send_data((x2 >> 8) & 0xFF);
send_data(y2 & 0xFF);
send_data((y2 >> 8) & 0xFF);
send_data(color & 0xFF);
send_data((color >> 8) & 0xFF);
}
```
在上面的代码中,我们使用了USART2串口与串口屏通信,通过调用send_cmd和send_data两个函数来发送数据。lcd_clear、lcd_draw_pixel和lcd_draw_line三个函数分别对应串口屏的清屏、画点和画线指令。在主函数中,我们使用了一个while循环来等待串口屏返回数据,并根据数据进行相应的处理。
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