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bugfix(uart): fix esp32 fifo_cnt bug

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When using DPort to read fifo, fifo_cnt is not credible, we need to calculate the real cnt based on the fifo read and write pointer. When using AHB to read FIFO, we can use fifo_cnt to indicate the data length in fifo.
This commit is contained in:
xiongyu 2020-05-29 22:09:36 +08:00
parent 1504fe5358
commit 27e6e8c485
2 changed files with 17 additions and 2 deletions
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3
components/driver/test/test_uart.c
View file

@ -292,7 +292,8 @@ TEST_CASE("uart tx with ringbuffer test", "[uart]")
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.flow_ctrl = UART_HW_FLOWCTRL_CTS_RTS,
.rx_flow_ctrl_thresh = 120,
.source_clk = UART_SCLK_APB,
};
TEST_ESP_OK(uart_param_config(uart_num, &uart_config));

16
components/soc/src/esp32/include/hal/uart_ll.h
View file

@ -238,7 +238,21 @@ static inline void uart_ll_txfifo_rst(uart_dev_t *hw)
*/
static inline uint32_t uart_ll_get_rxfifo_len(uart_dev_t *hw)
{
return hw->status.rxfifo_cnt;
uint32_t fifo_cnt = hw->status.rxfifo_cnt;
typeof(hw->mem_rx_status) rx_status = hw->mem_rx_status;
uint32_t len = 0;
// When using DPort to read fifo, fifo_cnt is not credible, we need to calculate the real cnt based on the fifo read and write pointer.
// When using AHB to read FIFO, we can use fifo_cnt to indicate the data length in fifo.
if (rx_status.wr_addr > rx_status.rd_addr) {
len = rx_status.wr_addr - rx_status.rd_addr;
} else if (rx_status.wr_addr < rx_status.rd_addr) {
len = (rx_status.wr_addr + 128) - rx_status.rd_addr;
} else {
len = fifo_cnt > 0 ? 128 : 0;
}
return len;
}
/**