ESP32 Forum

Posted: **Sat Apr 15, 2023 9:16 am**

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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,
        .source_clk = UART_SCLK_DEFAULT
    };
    uart_param_config(UART_NUM_1, &uart_config);
    uart_set_pin(UART_NUM_1, GPIO_NUM_7, GPIO_NUM_6, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    uart_driver_install(UART_NUM_1, 16, 0, 0, NULL, 0);
    
    char* send_check = "AT\r\n";
    uart_write_bytes(UART_NUM_1, send_check, strlen(send_check));
    char recv_check[128];
    uart_read_bytes(UART_NUM_1, &recv_check, 128, 100);
    ESP_LOGI(TAG, "dataIn:%s", &recv_check);

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这是我根据example写出来的代码,但是会报错

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[0;31mE (253) uart: uart_driver_install(1562): uart rx buffer length error[0m
[0;31mE (253) uart: uart_write_bytes(1244): uart driver error[0m
[0;31mE (263) uart: uart_read_bytes(1281): uart driver error[0m
[0;32mI (263) scan: dataIn:[0m

GeSHi © Codebox Plus Extension

根据报错,uart_driver_install的缓存大小已经从16设置到128,都是如此,请问原因在哪

Posted: **Tue Apr 18, 2023 9:00 am**

你应该把 rx_buffer_size 配置为比 FIFO 值 128 要大，一般建议1024.
这个是软件的Buffer值，也就是UART收到数据会先先从FIFO缓存到这个buffer里面，然后你read的时候可以取出来

Posted: **Thu May 04, 2023 5:12 am**

好的,我试试看,谢谢

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