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Merge branch 'bugfix/fix_uart_read_bug_when_using_dual_core_v3.2' into 'release/v3.2'

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driver(uart): fixed uart read error bug when using dual core (backport v3.2)

See merge request idf/esp-idf!3813
This commit is contained in:
Jiang Jiang Jian 2018-12-07 10:35:17 +08:00
commit 4f805d558c
1 changed files with 29 additions and 13 deletions
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42
components/driver/uart.c
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@ -875,6 +875,7 @@ static void uart_rx_intr_handler_default(void *param)
//If we fail to push data to ring buffer, we will have to stash the data, and send next time.
//Mainly for applications that uses flow control or small ring buffer.
if(pdFALSE == xRingbufferSendFromISR(p_uart->rx_ring_buf, p_uart->rx_data_buf, p_uart->rx_stash_len, &HPTaskAwoken)) {
p_uart->rx_buffer_full_flg = true;
uart_disable_intr_mask(uart_num, UART_RXFIFO_TOUT_INT_ENA_M | UART_RXFIFO_FULL_INT_ENA_M);
if (uart_event.type == UART_PATTERN_DET) {
if (rx_fifo_len < pat_num) {
@ -893,7 +894,6 @@ static void uart_rx_intr_handler_default(void *param)
}
}
uart_event.type = UART_BUFFER_FULL;
p_uart->rx_buffer_full_flg = true;
} else {
UART_ENTER_CRITICAL_ISR(&uart_spinlock[uart_num]);
if (uart_intr_status & UART_AT_CMD_CHAR_DET_INT_ST_M) {
@ -1164,6 +1164,22 @@ int uart_write_bytes_with_break(uart_port_t uart_num, const char* src, size_t si
return uart_tx_all(uart_num, src, size, 1, brk_len);
}
static bool uart_check_buf_full(uart_port_t uart_num)
{
if(p_uart_obj[uart_num]->rx_buffer_full_flg) {
BaseType_t res = xRingbufferSend(p_uart_obj[uart_num]->rx_ring_buf, p_uart_obj[uart_num]->rx_data_buf, p_uart_obj[uart_num]->rx_stash_len, 1);
if(res == pdTRUE) {
UART_ENTER_CRITICAL(&uart_spinlock[uart_num]);
p_uart_obj[uart_num]->rx_buffered_len += p_uart_obj[uart_num]->rx_stash_len;
p_uart_obj[uart_num]->rx_buffer_full_flg = false;
UART_EXIT_CRITICAL(&uart_spinlock[uart_num]);
uart_enable_rx_intr(p_uart_obj[uart_num]->uart_num);
return true;
}
}
return false;
}
int uart_read_bytes(uart_port_t uart_num, uint8_t* buf, uint32_t length, TickType_t ticks_to_wait)
{
UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", (-1));
@ -1184,8 +1200,17 @@ int uart_read_bytes(uart_port_t uart_num, uint8_t* buf, uint32_t length, TickTyp
p_uart_obj[uart_num]->rx_ptr = data;
p_uart_obj[uart_num]->rx_cur_remain = size;
} else {
xSemaphoreGive(p_uart_obj[uart_num]->rx_mux);
return copy_len;
//When using dual cores, `rx_buffer_full_flg` may read and write on different cores at same time,
//which may lose synchronization. So we also need to call `uart_check_buf_full` once when ringbuffer is empty
//to solve the possible asynchronous issues.
if(uart_check_buf_full(uart_num)) {
//This condition will never be true if `uart_read_bytes`
//and `uart_rx_intr_handler_default` are scheduled on the same core.
continue;
} else {
xSemaphoreGive(p_uart_obj[uart_num]->rx_mux);
return copy_len;
}
}
}
if(p_uart_obj[uart_num]->rx_cur_remain > length) {
@ -1206,16 +1231,7 @@ int uart_read_bytes(uart_port_t uart_num, uint8_t* buf, uint32_t length, TickTyp
vRingbufferReturnItem(p_uart_obj[uart_num]->rx_ring_buf, p_uart_obj[uart_num]->rx_head_ptr);
p_uart_obj[uart_num]->rx_head_ptr = NULL;
p_uart_obj[uart_num]->rx_ptr = NULL;
if(p_uart_obj[uart_num]->rx_buffer_full_flg) {
BaseType_t res = xRingbufferSend(p_uart_obj[uart_num]->rx_ring_buf, p_uart_obj[uart_num]->rx_data_buf, p_uart_obj[uart_num]->rx_stash_len, 1);
if(res == pdTRUE) {
UART_ENTER_CRITICAL(&uart_spinlock[uart_num]);
p_uart_obj[uart_num]->rx_buffered_len += p_uart_obj[uart_num]->rx_stash_len;
p_uart_obj[uart_num]->rx_buffer_full_flg = false;
UART_EXIT_CRITICAL(&uart_spinlock[uart_num]);
uart_enable_rx_intr(p_uart_obj[uart_num]->uart_num);
}
}
uart_check_buf_full(uart_num);
}
}