【GD32F310开发板试用】GD32F310连接ESP8266实现远程灯控制（双串口）

通过mcu与esp01通过uart连接，通过at指令来创建socket连接，接收远程控制灯的指令，实现灯亮、灭、闪；
打开两个串口，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；

ps.电阻不能直接连接EN和3.3V拉一根线也能起来；
有条件的话，可以选esp01s，无电阻。

uart0连接esp01、采用中断方式收发数据，检测接收数据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);
    }
}

https://gitee.com/lyzcc/gd32-…