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

2 vues (au cours des 30 derniers jours)
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?

Réponse acceptée

Venkatesh Chilapur
Venkatesh Chilapur le 4 Juil 2019
Hi Xu,
You find DMA configuration under hardware Implementation pane:
Capture.JPG
  2 commentaires
Xu Liu
Xu Liu le 4 Juil 2019
that's the point,it's very kind of you ,thanks.i guess i need to study harder.
Xu Liu
Xu Liu le 4 Juil 2019
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?

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Plus de réponses (1)

Venkatesh Chilapur
Venkatesh Chilapur le 4 Juil 2019
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
  1 commentaire
Xu Liu
Xu Liu le 4 Juil 2019
Thank you very much for your answer!
Another question is that I haven't seen dma module, is embedded coder automatically optimized for use?

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