Wangjialin a6b3be6734 Update UART driver
1. fix bug in ringbuffer.c:
    When return an dummy item, free_ptr might exceed rd_ptr, so the write_ptr would overwrite rd_ptr in this case.
2. Delete UART tx task in buffer mode. UART ISR will copy the data from tx buffer to fifo.
2016-11-04 02:48:25 +08:00
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2016-11-04 02:48:25 +08:00
2016-09-19 17:33:21 +08:00
2016-10-24 15:57:23 +08:00
2016-10-24 15:57:23 +08:00
2016-11-04 02:48:25 +08:00