xiongyu 27e6e8c485
bugfix(uart): fix esp32 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.
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xiongyu
27e6e8c485