c5504 DMA not working if using bootloader

Howard Wang

c5504 DMA data transfer is working with JTAG ICD. If loading same code with TI bootloader, DMA is NOT working anymore.

All other logical such as trigger GPIO in a forever loop is OK.

Did same test with CSL example under DMA folder (csl_dma_IntcExample.c) and the result is same. To be able to know if code is running, GPIO set and reset are added into the example code.

over 14 years ago

0 Hyun Kim over 14 years ago

TI__Genius 14965 points

Hi,

Do you use external memory for your DMA?

Regards,

Hyun

0 Howard Wang over 14 years ago in reply to Hyun Kim

Prodigy 235 points

Hi Hyun,

Both cases are tested. Results are same.

The CSL example as I mentioned is using internal memory. We always using CSL example as reference whenever there is a problem in our applications.

For this case, it looks like bootloader did something special during the initialization. After application is loaded, the setting is not 100% changed back even application did some initialization. What is missing?

In CSL example, there is not much initialization code except DMA config. In our application, we did set everything during power up time. Anyway, results are same. DMA is NOT working. Please help.

Thanks,

Howard

0 Hyun Kim over 14 years ago in reply to Howard Wang

TI__Genius 14965 points

Hi,

Have you followed this steps:http://processors.wiki.ti.com/index.php/C5515_Boot-Image_Programmer?

Regards,

Hyun

0 Pratap Reddy M V over 14 years ago in reply to Hyun Kim

Expert 2605 points

Hi,

Check if the information in the below post is useful

http://e2e.ti.com/support/dsp/tms320c5000_power-efficient_dsps/f/109/p/110194/391408.aspx#391408

Pratap

0 Howard Wang over 14 years ago in reply to Pratap Reddy M V

Prodigy 235 points

Hi,

Thanks for those information. A few things to confirme as followings:

1. Bootloader is working OK with our application except DMA. All other functions are tested and passed.

2. DSP chip used is c5504. Pratap's post is a useful hint. We will do more tests.

Thanks,

Howard

0 Howard Wang over 14 years ago in reply to Howard Wang

Prodigy 235 points

Hi,

Following two lines added:

ICR= 0x20E;

asm(" idle");

Then reading ISTR (idle status register) back to make sure mport is enabled.

DMA is still not working. Please help.

Thanks,

Howard

0 Howard Wang over 14 years ago in reply to Howard Wang

Prodigy 235 points

Hi,

Additional tests:

1. With emulator connected, reset CPU. Run application without loading program (ti booloader will load app automatically). DMA is not working

2. After step 1 the program is running, then loading symbols only, DMA works immediately

Why? Bootloader has completed the operation. Application is running. Loading symbols of program made DMA working OK.

Is there enough hints to see why DMA is not working? Please help.

Thanks,

Howard

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c5504 DMA not working if using bootloader