esp32s3串口协议

### ESP32-S3 UART Protocol Documentation For the ESP32-S3, configuring and using UART (Universal Asynchronous Receiver/Transmitter) is a common requirement for serial communication tasks. The UART interface allows data transmission between the microcontroller and other devices or systems over simple wiring. The configuration of UART on an ESP32-S3 can be done through the `UARTDriver` structure provided by the ESP-IDF framework[^1]. This setup involves initializing parameters such as baud rate, word length, stop bits, parity mode, etc., which are essential attributes defining how data should be transmitted across the line. Here's an example demonstrating initialization code written in C: ```c #include "driver/uart.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h" void uart_init(void){ const int uart_num = UART_NUM_1; const uart_config_t uart_config = { .baud_rate = 115200, .data_bits = UART_DATA_8_BITS, .parity = UART_PARITY_DISABLE, .stop_bits = UART_STOP_BITS_1, .flow_ctrl = UART_HW_FLOWCTRL_DISABLE }; // Configure UART parameters according to settings above. uart_param_config(uart_num, &uart_config); // Set UART pins based on your hardware connection. uart_set_pin(uart_num, TXD_PIN, RXD_PIN, RTS_PIN, CTS_PIN); } ``` This snippet initializes UART with specific configurations like setting up the baud rate at 115200 bps, choosing no parity bit, one stop bit, disabling flow control, and specifying pin numbers used for transmitting (`TXD_PIN`) and receiving (`RXD_PIN`) signals along with optional request-to-send (`RTS_PIN`) and clear-to-send (`CTS_PIN`) lines if needed. Additionally, sending strings via UART could look something similar to this function below: ```c void send_string(const char *str){ while(*str){ uart_write_bytes(UART_NUM_1, str++, 1); } } // Example usage within another task context might appear as follows: TaskHandle_t xHandle = NULL; void app_main(){ uart_init(); BaseType_t result = xTaskCreate(send_task,"send",configMINIMAL_STACK_SIZE,NULL,5,&xHandle); } static void send_task(void* arg){ while(1){ send_string("Hello from ESP32-S3!\r\n"); vTaskDelay(pdMS_TO_TICKS(1000)); } } ``` In these examples, messages get sent out periodically every second after establishing proper UART connections. Note that actual implementation details may vary depending upon project requirements and available resources.