功能描述
通过mcu与esp01通过uart连接，通过at指令来创建socket连接，接收远端控制灯的指令，来实现灯亮，灭及闪烁；
开启两路串口，usart0（GPIO09-TX，GPIO10-RX）连接esp01，进行收发at指令，usart1（GPIO02-TX，GPIO03-RX）作为log输出口；
效果视频
https://www.bilibili.com/vide...
接线图
ps.电阻可以不接，直接EN和3.3V拉一根线也能起来；
有条件的话，可以选esp01s，不用接电阻。
代码流程介绍
uart0连接esp01，收发数据使用中断方式进行，接收数据检测到OK，ERROR等关键字以后关闭接收。
uart中断
void USART0_IRQHandler(void) {
if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE)) {
/* receive data */
rx_buffer[rx_count++] = usart_data_receive(USART0);
if(rx_count >= BUFFER_SIZE) {
usart_interrupt_disable(USART0, USART_INT_RBNE);
printf("rx buffer is full!!\n");
recv_flag = 0;
}
if(strstr((const char *)rx_buffer, "OK\r\n") ||
strstr((const char *)rx_buffer, "ERROR\r\n")
){
usart_interrupt_disable(USART0, USART_INT_RBNE);
recv_flag = 0;
}
else if(strstr((const char *)rx_buffer, "blink") ||
strstr((const char *)rx_buffer, "on") ||
strstr((const char *)rx_buffer, "off")
){
usart_interrupt_disable(USART0, USART_INT_RBNE);
recv_flag = 0;
}
}
if(RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_TBE)) {
/* transmit data */
usart_data_transmit(USART0, tx_buffer[tx_count++]);
if(tx_count >= BUFFER_SIZE) {
usart_interrupt_disable(USART0, USART_INT_TBE);
send_flag = 0;
}
if(tx_count >= send_len)
{
usart_interrupt_disable(USART0, USART_INT_TBE);
send_flag = 0;
send_len = 0;
}
}
}uart初始化：
/* enable COM GPIO clock */
rcu_periph_clock_enable(RCU_GPIOA);
/* connect port to USARTx_Tx */
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_9);
/* connect port to USARTx_Rx */
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_10);
/* configure USART Tx as alternate function push-pull */
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_9);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_9);
/* configure USART Rx as alternate function push-pull */
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_10);
/* enable USART clock */
rcu_periph_clock_enable(RCU_USART0);
/* USART configure */
usart_deinit(USART0);
usart_baudrate_set(USART0, 115200U);
usart_receive_config(USART0, USART_RECEIVE_ENABLE);
usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
usart_enable(USART0);
nvic_irq_enable(USART0_IRQn, 0, 0);LED初始化：
GPIO_InitTypeDef GPIO_InitStruct = {0};
/*GPIO Port Clock Enable */
rcu_periph_clock_enable(RCU_GPIOA);
/*Configure GPIO pin : PtPin PA8*/
GPIO_InitStruct.gpio_periph = GPIOA;
GPIO_InitStruct.mode = GPIO_MODE_OUTPUT;
GPIO_InitStruct.pin = GPIO_PIN_8;
GPIO_InitStruct.otype = GPIO_OTYPE_PP;
GPIO_InitStruct.speed = GPIO_OSPEED_50MHZ;
GPIO_InitStruct.pull_up_down = GPIO_PUPD_NONE;
gpio_mode_set(GPIO_InitStruct.gpio_periph,GPIO_InitStruct.mode,GPIO_InitStruct.pull_up_down,GPIO_InitStruct.pin);
/*Configure GPIO pin Output Level */
gpio_output_options_set(GPIO_InitStruct.gpio_periph,GPIO_InitStruct.otype,GPIO_InitStruct.speed,GPIO_InitStruct.pin);
GPIO_BC(GPIO_InitStruct.gpio_periph) = GPIO_InitStruct.pin;
/* EXTI interrupt init*/主程序代码：
int main(void)
{
e_at_state at_state = e_init;
/* enable DMA clock */
init();
led_flash(5);
while(1) {
switch (at_state)
{
case e_init:
sat("ATE0\r\n", "OK");
if(!sat("AT\r\n", "OK")){
led_on();
at_state = e_at_ok;
}
else{
delay_1ms(100);
led_off();
}
break;
case e_at_ok:
if(!sat("AT+CWJAP=\"testssid\",\"12345678\"\r\n", "WIFI GOT IP"))
{
at_state = e_wifi_ok;
}
else{
delay_1ms(100);
}
break;
case e_wifi_ok:
if(!sat("AT+CIFSR\r\n", "CIFSR:STAIP"))
{
at_state = e_sock_ok;
}
else
{
delay_1ms(100);
}
at_state = e_sock_ok;
break;
case e_sock_ok:
//close socket
sat("AT+CIPCLOSE\r\n", "OK");
//start a new socket
if(!sat("AT+CIPSTART=\"TCP\",\"192.168.1.36\",1314\r\n", "CONNECT"))
{
//sat("AT+CIPSEND=10","OK");
at_state = e_connect_ok;
}
else
{
delay_1ms(100);
}
break;
case e_connect_ok:
{
char at_resp[128] = {0};
wait_atrsp(at_resp);
if(strstr(at_resp,"on")){
printf("light on\n");
led_on();
}
else if(strstr(at_resp,"off")){
printf("light off\n");
led_off();
}
else if(strstr(at_resp, "blink"))
{
printf("buling buling\n");
led_flash(10);
}
else
{
printf("other cmd got:[%s]\r\n", at_resp);
}
}
break;
default:
printf("Get into other:%d\n",at_state);
break;
}
//delay_1ms(100);
}
}代码仓库地址
https://gitee.com/lyzcc/gd32-...
待改善
- usart接收数据采用关键字判断结束，效率较低；
- at指令接收没有超时，如果得不到期望结果会卡住；
- socket异常断开没有做处理；
- 后面可以接一个继电器控制插座或者台灯
- 因为esp01升级不到最新版本，无法支持mqtt，只能点对点控制玩玩了，支持mqtt就可以做更多事情；
- 异步中断处理usart_interrupt_flag_get不是很理解，正常接收或者发送完数据应该是可以退出，但是好像一直无法退出，不知道是使用的问题还是哪里出的问题，有经验的大神可以交流交流指导指导；
