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Problem with TMS570 SCI Multi-Buffer Mode

jinus zhang
Intellectual 340 points

Hello everyone,

I am using SCI1 with DMA + Multi-Buffer(8bytes)  mode . Since i have about 100 bytes data to receive every 100ms. Because the data size is not a multiple of 8, i can not get complete frame every time.

My questions:

1.  I want to know if there is a flag in register that indicate howmany bytes left in the buffer? I did not find in the user guide. 

2.  How to clear the buffer?

3.  I try to directly read  LINRD0 and LINRD1  registers when receiving completed, but it seems the data is still there when receiving the next frame of data. Why?

Thanks!