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fix(uart): tx write bytes fails to use non-default tx fifo empty threshold

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Users may see tx write bytes fails to feed data into tx fifo in time
even if the tx fifo empty threshold has been set to a large value.
This commit is contained in:
Song Ruo Jing
2026-02-13 18:54:38 +08:00
parent 715395a164
commit 370f885c59
2 changed files with 11 additions and 8 deletions
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components/esp_driver_uart/src/uart.c
+6 -3
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@@ -697,11 +697,14 @@ esp_err_t uart_disable_tx_intr(uart_port_t uart_num)
esp_err_t uart_enable_tx_intr(uart_port_t uart_num, int enable, int thresh)
{
(void)enable;
ESP_RETURN_ON_FALSE((uart_num < UART_NUM_MAX), ESP_FAIL, UART_TAG, "uart_num error");
ESP_RETURN_ON_FALSE((thresh < UART_HW_FIFO_LEN(uart_num)), ESP_FAIL, UART_TAG, "empty intr threshold error");
uart_hal_clr_intsts_mask(&(uart_context[uart_num].hal), UART_INTR_TXFIFO_EMPTY);
UART_ENTER_CRITICAL(&(uart_context[uart_num].spinlock));
uart_hal_set_txfifo_empty_thr(&(uart_context[uart_num].hal), thresh);
if (thresh != -1) {
uart_hal_set_txfifo_empty_thr(&(uart_context[uart_num].hal), thresh);
}
uart_hal_ena_intr_mask(&(uart_context[uart_num].hal), UART_INTR_TXFIFO_EMPTY);
UART_EXIT_CRITICAL(&(uart_context[uart_num].spinlock));
return ESP_OK;
@@ -1661,7 +1664,7 @@ static int uart_tx_all(uart_port_t uart_num, const char *src, size_t size, bool
xRingbufferSend(p_uart_obj[uart_num]->tx_ring_buf, (void *)(src + offset), send_size, portMAX_DELAY);
size -= send_size;
offset += send_size;
uart_enable_tx_intr(uart_num, 1, UART_THRESHOLD_NUM(uart_num, UART_EMPTY_THRESH_DEFAULT));
uart_enable_tx_intr(uart_num, 1, -1);
}
}
} else {
@@ -1671,7 +1674,7 @@ static int uart_tx_all(uart_port_t uart_num, const char *src, size_t size, bool
uint32_t sent = uart_enable_tx_write_fifo(uart_num, (const uint8_t *) src, size);
if (sent < size) {
p_uart_obj[uart_num]->tx_waiting_fifo = true;
uart_enable_tx_intr(uart_num, 1, UART_THRESHOLD_NUM(uart_num, UART_EMPTY_THRESH_DEFAULT));
uart_enable_tx_intr(uart_num, 1, -1);
}
size -= sent;
src += sent;