是否是在light sleep模式下，ESP32 C3的串口接收不能正常工作？

ESP32 C3, IDF 4.3.1版本， exampleswifipower_save这个例程，加上一个UART接收功能，发现UART数据接收不正常，收不到正确数据（但发UART数据可以）

测试程序如下：


// check if power save/light sleep will affect uart or not

static void uart_task(void *arg)

{

    /* Configure parameters of an UART driver,

     * communication pins and install the driver */

    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_APB,

    };

    int intr_alloc_flags = 0;



#if CONFIG_UART_ISR_IN_IRAM

    intr_alloc_flags = ESP_INTR_FLAG_IRAM;

#endif



    ESP_ERROR_CHECK(uart_driver_install(ECHO_UART_PORT_NUM, BUF_SIZE * 4, 0, 0, NULL, intr_alloc_flags));

    ESP_ERROR_CHECK(uart_param_config(ECHO_UART_PORT_NUM, &uart_config));

    ESP_ERROR_CHECK(uart_set_pin(ECHO_UART_PORT_NUM, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS));



    // Configure a temporary buffer for the incoming data

    uint8_t *data = (uint8_t *) malloc(BUF_SIZE);



    while (1) {

        // Read data from the UART

        int len = uart_read_bytes(ECHO_UART_PORT_NUM, data, BUF_SIZE, 20 / portTICK_RATE_MS);



        if(len > 0) //         // Write data back to the UART

            uart_write_bytes(ECHO_UART_PORT_NUM, (const char *) data, BUF_SIZE);

                        

         vTaskDelay(20 / portTICK_PERIOD_MS);  // every uart command gap 8ms

        data[0] = 0;

    }

        

    free(data);

}



void app_main(void)

{

    // Initialize NVS

    esp_err_t ret = nvs_flash_init();

    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {

        ESP_ERROR_CHECK(nvs_flash_erase());

        ret = nvs_flash_init();

    }

    ESP_ERROR_CHECK( ret );

        

#if CONFIG_PM_ENABLE

    // Configure dynamic frequency scaling:

    // maximum and minimum frequencies are set in sdkconfig,

    // automatic light sleep is enabled if tickless idle support is enabled.

    esp_pm_config_esp32c3_t pm_config = {

            .max_freq_mhz = CONFIG_EXAMPLE_MAX_CPU_FREQ_MHZ,

            .min_freq_mhz = CONFIG_EXAMPLE_MIN_CPU_FREQ_MHZ,

#if CONFIG_FREERTOS_USE_TICKLESS_IDLE  // note ,if enabled this (pw saving), uart will fail to work correctly

            .light_sleep_enable = true

#endif

    };

    ESP_ERROR_CHECK( esp_pm_configure(&pm_config) );

#endif // CONFIG_PM_ENABLE



    initialise_wifi();

        

    xTaskCreate(uart_task, "uart_rev_task", ECHO_TASK_STACK_SIZE, NULL, 10, NULL);  // configMAX_PRIORITIES - 0



    wifi_power_save();

}



当在menuconfig中disable power saving后，串口才能接收正常。

请问，是否是在light sleep 模式下， C3的串口接收不能正常工作？