kl16 dma with enable circular

[yourchoochoo]

Hi,

I use KL16  DMA  for uart transfer .

When i use DMA, i enable  DMOD (Destination Address Modulo) ，and set circular buffer size 16 bytes(DMOD writed 0000) ，.

After  uart  trans  16  bytes,  receive_buffer will  lost the last data(receive_buffer[15]), and  BCR value  is right.

The same  thing happens when DMOD be set to 0010.Will lost receive_buffer[31].

[mjbcswitzerland · Accepted solution]

Hi Yi

Ensure that the memory that you are receiving the data to is also modulo aligned. That is, if you use modulo 16 make sure that it starts on a boundary that is divisible by 16; eg. 0x20000000, 0x20000010, 0x20000020, etc. when in SRAM.

Regards

Mark