手册里这样写的。
Double-buffer type transactions: double buffer transfers using two memory pointers for
the memory (while the DMA is reading/writing from/to a buffer, the application can
write/read to/from the other buffer).
buffer应该是sram里的一片区域吧。
DMA对其中一块写数据的同时,CPU能同时访问另一块的数据? |