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EK-TM4C1294XL: Slave SSI with uDMA ping-pong mode and flash program

Nicolas SERRANO
Prodigy 40 points
Part Number: EK-TM4C1294XL

Hello,

I have a full working code with Slave SSI and uDMA in ping-pong mode to get data from an ADC.

Now I want to store the data into the internal Flash.

But when I try to program data to the internal flash with the FlashProgram API while the uDMA is in progress, the interrupt handler of the DMA is called in loop with the IRQ DMARX but DMA mode doesn't indicate any completed DMA.

Could someone give me any advice?

Is there any restrictions to use uDMA in ping-pong mode while programming the internal flash?

Regards,

Nicolas

  • 0
    TI__Guru**** 191186 points
    Hi Nicolas,
    Why do you want to store data in internal flash instead of EEprom? The internal flash is non-volatile and you will need to erase the flash if you want to change the data. The internal flash is normally for storing your program image.
  • 0 in reply to Charles Tsai
    Prodigy 40 points

    Hi Charles,

    I want to use the internal FLASH because the EEPROM is too small, only 6kB.

    I have a data rate of 2bits at 8MHz and I need to record as much as possible.

    Nicolas

  • 0 in reply to Nicolas SERRANO
    Prodigy 40 points

    Hello,

    I tried to run all my code from SRAM, but ISR of SSI for DMA RX doesn't seem to run.

    Any idea?

    Nicolas

  • 0 in reply to Nicolas SERRANO
    TI__Guru**** 191186 points
    Hi Nocolas,
    Can you elaborate the purpose of running code from SRAM? You would need to copy the code from flash to SRAM, wouldn't you? When you said the ISR of SSI for DMA RX does not seem to run, do you mean the ISR was never entered? If this is the case, then you will want to check if the DMA has completed the transfer. In order for the DMA to transfer, it needs to receive a DMA request from the SSI module. Is the RXDMAE (Receive DMA enable) bit set in the SSIDMACTL register?
  • 0 in reply to Charles Tsai
    Prodigy 40 points

    Hi Charles,

    To avoid flash access when running software during the log of data into the flash, I try to run all the software application from SRAM. Currently, I use the debugger, so I expect there is no need to copy application from flash to SRAM. I just change the "ccs.cmd" file to map all sections to SRAM.

    When I put all sections into the SRAM, the ISR for RX DMA of SSI peripheral is never entered. I double checked the RXDMAE bit and it is well set to 1.

    But if I keep the sections ".intvecs" into the FLASH, no problem with the ISR...

    Nicolas

  • 0 in reply to Nicolas SERRANO
    TI__Guru**** 191186 points

    Hi Nicolas,
    Yes, you need to have the intvecs at 0x0. After you erase the flash and load the code the address 0x0 and 0x4 are all F's if you didn't have the .intvecs mapped to 0x0, right?