xiongyu f75088d40d bugfix(uart): fix esp32 uart fifo_cnt bug ...

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.

2020-06-03 12:29:06 +08:00

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