我使用IDF5.1編譯Uart example中的 uart_echo_example_main.c ，傳送Uart資料，S3回傳剛剛傳送的資料，但是我回傳的資料中，byte 1 跟其他byte 都會有一個間隔，如下圖所示，請問要如何解決？
左圖為確定讀取的資料長度為 5 , 右圖為echo時回應 5個 byte
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#define ECHO_TEST_RXD (36)
#define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
#define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)
#define ECHO_UART_PORT_NUM (CONFIG_EXAMPLE_UART_PORT_NUM)
#define ECHO_UART_BAUD_RATE (CONFIG_EXAMPLE_UART_BAUD_RATE)
#define ECHO_TASK_STACK_SIZE (CONFIG_EXAMPLE_TASK_STACK_SIZE)
static const char *TAG = "UART TEST";
#define BUF_SIZE (1024)
static void echo_task(void *arg)
{
/* Configure parameters of an UART driver,
* communication pins and install the driver */
uart_config_t uart_config = {
.baud_rate = ECHO_UART_BAUD_RATE,
.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,
};
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 * 2, 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 - 1), 20 / portTICK_PERIOD_MS);
// Write data back to the UART
uart_write_bytes(ECHO_UART_PORT_NUM, (const char *) data, len);
if (len) {
ESP_LOGI(TAG, "len: %d", len);
data[len] = '\0';
ESP_LOGI(TAG, "Recv str: %s", (char *) data);
}
}
}
void app_main(void)
{
xTaskCreate(echo_task, "uart_echo_task", ECHO_TASK_STACK_SIZE, NULL, 10, NULL);
}