What's Remap ePWMs for DMA access (Requires silicon revision A and above) means?

hello everyone,im doing code generation with c2000 devices,

when I make the model of 28377d to relocated 28335,im facing this choise :Remap ePWMs for DMA access (Requires silicon revision A and above)

whether i need to choise it? does there anyone have the same doubt？

Answer 1

[Venkatesh Chilapur]

Hi Xu,

You find DMA configuration under hardware Implementation pane:

[Xu Liu]

that's the point,it's very kind of you ,thanks.i guess i need to study harder.

[Xu Liu]

it looks like you are quite good at 335,i wonder whether use DMA could be better for my project? as i know DMA seems a enrich function for data transfer and reducing cpu time, so if its so useful, whether just choise this function with my work is better?

Answer 2

[Venkatesh Chilapur]

Hi Xu,

From device data sheet if the silicon version is >='A' then we have the following details.

"By default, ePWM and HRPWM registers are mapped to Peripheral Frame 1 (PF1). Table 6-4 shows this

configuration. To re-map the registers to Peripheral Frame 3 (PF3) to enable DMA access, bit 0 (MAPEPWM) of

MAPCNF register (address 0x702E) must be set to 1. Table 6-5 shows the remapped configuration" of section 6.2.3.

So to use DMA with ePWM module we need to enable the re-map.

HTH,

Regards,

Venkatesh C

[Xu Liu]

Hi Venkatesh

Thank you very much for your answer！

Another question is that I haven't seen dma module, is embedded coder automatically optimized for use?