Wangjialin 315aa1fcd8 Fix uart tx function block issue
To enable tx empty interrupt each time the tx ringbuffer get filled, so that tx function will not block if tx data length is larger than tx ringbuffer size.
Reported from customer of Audio team.
2017-04-12 16:57:37 +08:00
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2016-12-29 17:29:14 +08:00
2017-03-17 17:26:30 +08:00
2016-12-18 17:20:17 +08:00
2017-04-12 16:57:37 +08:00