The series of patches fix bugs when using multiple serial ports at the same
time:
- The using rx ring buffer in DMA is inconsistent with its allocation.
- The serial port can't send and receive data when it's opened the second time
and the later if it switches to PIO when DMA channel is not
The series of patches fix bugs when using multiple serial ports at the same
time:
- The using rx ring buffer in DMA is inconsistent with its allocation.
- The serial port can't send and receive data when it's opened the second time
and the later if it switches to PIO when DMA channel is not
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