topic Re: DMAMUX_CHCFG Source for SPI0 transmit/receive in Vybrid Processors

DMAMUX_CHCFG Source for SPI0 transmit/receive

MehmetAliIpin — Tue, 11 Feb 2014 09:40:37 GMT

Dear community,

I am trying to establish a slave SPI0 interface with DMA0 with DMAMUX2. When I write the DMAMUX_CHCFG_SOURCE(13) to the DMAMUX0_CHCFG2 I get all

DOE,

DAE,

SOE,

SAE

error bits of DMA0 Error status registere are set.

DMAMUX0_CHCFG2 = DMAMUX_CHCFG_SOURCE(13) | DMAMUX_CHCFG_ENBL_MASK;

I am using the number 13 because of table 8-2 of ref. manual.

How can I tell the DMAMUX unit that I will connect it SPI0 transmit/receive?

Thanks and best regards

Mehmet Ali Ipin

Re: DMAMUX_CHCFG Source for SPI0 transmit/receive

karina_valencia — Wed, 12 Feb 2014 17:55:11 GMT

timesyssupport can you help with this case?

Re: DMAMUX_CHCFG Source for SPI0 transmit/receive

timesyssupport — Wed, 12 Feb 2014 21:00:15 GMT

Hello Mehmet,

Have you followed both notes in section 22.3.1 in the Vybrid reference manual? I am unsure if your code:

DMAMUX0_CHCFG2 = DMAMUX_CHCFG_SOURCE(13) | DMAMUX_CHCFG_ENBL_MASK;

will work due to the note, "Before changing the trigger or source settings, a DMA channel must be disabled via the CHCFGn[ENBL] bit.". Try disabling the CHCFGn[ENBL] bit, set the source, then enable the CHCFGn[ENBL] bit.

Thanks,

Timesys Support

Re: DMAMUX_CHCFG Source for SPI0 transmit/receive

MehmetAliIpin — Thu, 13 Feb 2014 06:46:56 GMT

Dear Timesys support,

Thank you very much,

Now I can transmit with SPI0 DMA channel.