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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 b52ed2d2a5
commit eea38d7698
1 changed files with 15 additions and 1 deletions
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16
components/soc/src/esp32/include/hal/uart_ll.h
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@ -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;
}
/**