ch32v003记录2，串口通信例程
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#include “ch32v00x.h”
#include <stdio.h>
/* 发送一个字符 */
void uart_putc(char ch)
{
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
USART_SendData(USART1, ch);
}
/* 接收一个字符（阻塞） */
char uart_getc(void)
{
while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
return (char)USART_ReceiveData(USART1);
}
/* UART 初始化 */
void uart_init(uint32_t baudrate)
{
GPIO_InitTypeDef GPIO_InitStructure = {0};
USART_InitTypeDef USART_InitStructure = {0};
/* ① 使能外设时钟 */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1, ENABLE); /* ② 配置 GPIO： * PD5 — USART1_TX (复用推挽输出, 10MHz) * PD6 — USART1_RX (浮空输入) */ // TX — PD5 pin8 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOD, &GPIO_InitStructure); // RX — PD6 pin1 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOD, &GPIO_InitStructure); /* ③ 配置 USART1 参数 */ USART_InitStructure.USART_BaudRate = baudrate; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, &USART_InitStructure); /* ④ 使能 USART1 */ USART_Cmd(USART1, ENABLE);}
/* 主函数 */
int main(void)
{
uint8_t rx_buf[5];
/* 系统时钟默认 HSI 24MHz，如有需要可另行配置 */ SystemInit(); uart_init(115200); printf("CH32V003J4M6 UART Test——Hello!\r\n"); printf("waiting 5 bytes...\r\n"); while (1) { for (int i = 0; i < 5; i++) { rx_buf[i] = uart_getc(); } printf("Recv 5 bytes: "); for (int i = 0; i < 5; i++) { uart_putc(rx_buf[i]); } printf("\r\n"); }}
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pin1.和pin8，要注意的是叫tx和rx的互换