xiongyu c9d9545310 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.
2020-06-15 12:22:33 +08:00
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2020-02-21 22:39:12 +08:00
2019-11-01 12:05:12 +08:00
2019-08-05 05:34:11 +00:00
2020-04-28 12:39:54 +08:00