topic Re: kl16 dma with enable circular in Kinetis Microcontrollers

kl16 dma with enable circular

yourchoochoo — Tue, 18 Dec 2018 12:15:08 GMT

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].

Re: kl16 dma with enable circular

mjbcswitzerland — Tue, 18 Dec 2018 21:46:55 GMT

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