LPC MicrocontrollersのトピックRe: process dma data from adc

process dma data from adc

navidfanaee — Mon, 29 Jun 2020 09:24:48 GMT

hi all

i am working on a project dealing with transferring adc data via DMA. i need to know the the end of data address at destination buffer where i stopped conversion so i can put a flag for end of data. i also need to process data so i can extract some properties from the data. thanks in advance for your help.

Re: process dma data from adc

Sebastian_Del_Rio — Wed, 01 Jul 2020 18:33:41 GMT

Hi Navid, I hope you're doing well!

Could you please confirm which version of the LPC43xx are you using so I can provide the most accurate information?

Take care, best regards,

Sebastian

Re: process dma data from adc

navidfanaee — Sat, 04 Jul 2020 08:50:03 GMT

hi Sebastian

thank you for your consideration. it is LPC_Link2 evaluation board which has LPC 4370 on it.

Re: process dma data from adc

Sebastian_Del_Rio — Tue, 14 Jul 2020 21:05:35 GMT

Hi Naven,

Depending on the length of the DMA transmission, and the destination Address for the DMA transfer the ending address can be calculated, and a flag can be manually introduced to determine the end of a given transmission.

There's some code examples included in the LPC4370's LPC-Open package, namely, the DMA timertrig example:

<…lpcopen_3_02_keil_iar_lpclink2_4370\LPC43xx_18xx\prj_link4370\lpcxpresso\periph_dma_timertrig>

Please let me know if you need any more information.

Take care, best regards,

Sebastian

Re: process dma data from adc

navidfanaee — Wed, 15 Jul 2020 15:17:52 GMT

Hi sebastian

Thank you for your reply. I finally used LPC_GPDMA->ch[0].DES which is the address of the last converted data in the destination buffer.