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C6748有关UPP中DMA配置的问题请教

Upp接一个12bit的ADC,总数据量为1MB,在设置line count 和byte count的时候,是如何设置这两个值的,因为总的数据量是这两个值的乘积,而这两个值的搭配可以是多种的组合,例如line =2*1024,byte = 512,总的数据量就是1MB,那么line也可以为1024,byte为1024,总的数据量还是1MB,那么是根据什么来调整这两个值的大小的?