TMS570LC4357: TMS570LC43x MibSPI DMA example not working

Daniel_EE

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

I tried the example code for MIBSPIDMA, which works fine.

In this example it uses the MIBSPI1. I change it to MIBSPI3. I also configured MIBSPI using HALCOGEN ,but I don't see any change in RXDATA.

over 8 years ago

0 Daniel_EE over 8 years ago

Intellectual 670 points

I have attached my main.c file.

I used the existing example given from HALCOGEN. I used MibSPI3 instead of MibSPI1.

I also made few changes in the infinite loop. I am transferring data after every half a second.

I don't see any change in RXDATA. Can anyone point out what's wrong in my code?

I have one another question about the mibspiDmaConfig(mibspiREG3,0,14,15); I am assuming that this will configure DMA_CH0 with DMA_REQ 14 for the transmitter and 15 for the receiver. But I configured

dmaSetChEnable(DMA_CH0, DMA_HW);
dmaSetChEnable(DMA_CH1, DMA_HW);

So what about DMA_CH1? Do I need to configure DMA_CH1 just like DMA_CH0? 0624.example_mibspiDMA.c

0 Jan Cumps over 8 years ago in reply to Daniel_EE

Guru 15740 points

I had the same issue initial. Because the data is updated without CCS knowing it (in the background by DMA), it doesn't show the changed data.
The program works fine, the memory is correct, but the watch window doesn't update...
I'll have to re-check what I did in CCS to see the changed data.

0 Jan Cumps over 8 years ago in reply to Daniel_EE

Guru 15740 points

Ah, found it back:

Maybe you skipped over the same instructions as I did in my first attempt?

0 Daniel_EE over 8 years ago in reply to Jan Cumps

Intellectual 670 points

I tried the steps, you mentioned in video. I was able to get MibSPI working which I was able to get it working before. I disable the MibSPI1 driver from Halcogen and enable MibSPI3 driver and configured same as MibSPI1. But code does not work. I have attached my project if you can look at it.

Another issue I have is RXDATA updates only one time even If I transferring in while loop. Note: This also only work with MibSPI1.7282.SPIMaster.zip

0 Daniel_EE over 8 years ago in reply to Daniel_EE

Intellectual 670 points

I was able to resolve the issue about RXDATA being updated only once. It was actually the oneshot bit in DMACTRL register. But still I am struggling to enable MIBSPI3 DMA.

0 Chuck Davenport over 8 years ago in reply to Daniel_EE

TI__Guru 59540 points

Daniel,

Can you provide more details of what types of issues you are seeing in attempting DMA with MibSPI3? The steps should be the same for each of the modules with exception of the base addresses.

0 Daniel_EE over 8 years ago in reply to Chuck Davenport

Intellectual 670 points

The issue is RXDATA does not update. I configured MIBSPI3 same as MIBSPI1. With MIBSPI, it works just fine. I also configured MPU as mentioned in the example.

But still, I don't see the same behavior.

0 Chuck Davenport over 8 years ago in reply to Daniel_EE

TI__Guru 59540 points

Daniel,

In your prior posts you indicated that you were able to receive data. Was that only on MibSPI1 or were you also able to do so on MibSPI3 but not with DMA enabled? Just curious for my own clarification.

Also, are you using DMA for transferring data into the Tx buffer and for Rx? And also to confirm, are you using the module in standard SPI mode or in MibSPI (buffered) mode?

0 Daniel_EE over 8 years ago in reply to Chuck Davenport

Intellectual 670 points

I tried the example DMAwithMibSPi , which uses the MibSPI1, worked fine. I changed the given example to use MibSPI3 . For that I simply changed few things like DMA channel number and MibSPI configuration.But I kept the same settings for both.