TMS570LS1224: TMS570LS1224: MibSPI3 TX using DMA not working (urgent help needed)

Adarsh GN

Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN, TMS570LS3137

Tool/software:

Hi,

I’m working on the TMS570LS1224 LaunchPad and trying to implement MibSPI3 transmit using DMA (TX-only). I’ve successfully implemented MibSPI3 without DMA, but DMA TX is not working despite trying several approaches. There is no GUI support for MibSPI DMA in HALCoGen (v04.07.01), so I’ve manually configured DMA via code. It will be very helpful if you support with DMA RX also. i will attach the screen shoot of logic analyzer also for reference.

uint16_t tx_data[10] = {0xAA01, 0xAA02, 0xAA03, 0xAA04, 0xAA05,
                        0xAA06, 0xAA07, 0xAA08, 0xAA09, 0xAA0A};

g_dmaCTRL g_dmaCTRLPKT_TX;

void dmaSetupForMibspi3_Tx()
{
    g_dmaCTRLPKT_TX.SADD      = (uint32_t)tx_data;
    g_dmaCTRLPKT_TX.DADD      = (uint32_t)&(mibspiRAM3->tx[0].data);
    g_dmaCTRLPKT_TX.CHCTRL    = 0;
    g_dmaCTRLPKT_TX.FRCNT     = 1;
    g_dmaCTRLPKT_TX.ELCNT     = 10;
    g_dmaCTRLPKT_TX.ELDOFFSET = 2;
    g_dmaCTRLPKT_TX.ELSOFFSET = 0;
    g_dmaCTRLPKT_TX.FRDOFFSET = 0;
    g_dmaCTRLPKT_TX.PORTASGN  = 0U;
    g_dmaCTRLPKT_TX.RDSIZE    = ACCESS_16_BIT;
    g_dmaCTRLPKT_TX.WRSIZE    = ACCESS_16_BIT;
    g_dmaCTRLPKT_TX.TTYPE     = BLOCK_TRANSFER;  // tried FRAME_TRANSFER too
    g_dmaCTRLPKT_TX.ADDMODERD = ADDR_INC1;
    g_dmaCTRLPKT_TX.ADDMODEWR = ADDR_FIXED;
    g_dmaCTRLPKT_TX.AUTOINIT  = AUTOINIT_OFF;

    dmaSetCtrlPacket(DMA_CH0, g_dmaCTRLPKT_TX);
}

int main(void)
{
    mibspiInit();
    gioInit();

    dmaSetupForMibspi3_Tx();
    dmaEnable();
    dmaReqAssign(DMA_CH0, 14); // MibSPI3_TX = DMA_REQ14
    dmaSetChEnable(DMA_CH0, DMA_SW);

//    mibspiSetData(mibspiREG3, 0, tx_data);  // for trying with out DMA 

    mibspiTransfer(mibspiREG3, 0); 

    while(!(mibspiIsTransferComplete(mibspiREG3, 0)));

    while(1);
}

Without DMA :

With DMA:

Setup:

MibSPI3 is initialized using HALCoGen

DMA is manually initialized in code (see below)

I'm using DMA Channel 0 and DMA Request Line 14 for MibSPI3_TX

Issue:

DMA transfer never seems to take place.

Data is not moved to mibspiRAM3->tx[], and MOSI pin shows no activity.

Without DMA (mibspiSetData()), the transfer works fine.

1 month ago

0 jagadish gundavarapu 1 month ago

TI__Guru 69891 points

Hi Adarsh,

Thanks for contacting us!

First i will suggest you to refer below video tutorial on MibSPI DMA:

(+) [FAQ] TMS570LC4357: Examples and Demos available for Hercules Controllers (E.g. TMS570x, RM57x and RM46x etc) - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

And also, we do have one MibSPI DMA example in HALCoGen:

If you refer these two, hopefully this should solve your problem, if not then i will debug your issue further.

--
Thanks & regards,
Jagadish.

0 Adarsh GN 1 month ago in reply to jagadish gundavarapu

Prodigy 25 points

Hi Jagadish,

Thank you for your reply.

I have already gone through all the forum posts related to MibSPI DMA, but I haven’t been able to identify what’s wrong with my code.

I am working with the TMS570LS1224, where MibSPI3 TX is mapped to DMAREQ14 and RX to . For now, I am only trying to implement TX using DMA.

I have tried all possible combinations and configurations, but unfortunately, I am not getting the desired output. As shown in the screenshots I uploaded earlier, MibSPI3 transmission works perfectly without DMA. However, when I attempt to use DMA for TX, it does not work.

Could you please help me identify what might be going wrong?

Best regards,
Adarsh G N

#define DMA_CHANNEL_TX     DMA_CH0
#define MIBSPI3_TX_REQLINE 14
#define TG0_LENGTH         10

uint16_t tx_data[TG0_LENGTH] = {0xAA01, 0xAA02, 0xAA03, 0xAA04, 0xAA05,0xAA06, 0xAA07, 0xAA08, 0xAA09, 0xAA0A};

g_dmaCTRL g_dmaCTRLPKT_TX;

void dmaSetupForMibspi3_Tx()
{
    g_dmaCTRLPKT_TX.SADD      = (uint32_t)tx_data;
    g_dmaCTRLPKT_TX.DADD      = (uint32_t)&(mibspiRAM3->tx[0].data);
    g_dmaCTRLPKT_TX.CHCTRL    = 0;
    g_dmaCTRLPKT_TX.FRCNT     = 1;
    g_dmaCTRLPKT_TX.ELCNT     = 10;
    g_dmaCTRLPKT_TX.ELDOFFSET = 2;                  // tried 4 and 0 
    g_dmaCTRLPKT_TX.ELSOFFSET = 0;
    g_dmaCTRLPKT_TX.FRDOFFSET = 0;
    g_dmaCTRLPKT_TX.PORTASGN  = 0U;
    g_dmaCTRLPKT_TX.RDSIZE    = ACCESS_16_BIT;
    g_dmaCTRLPKT_TX.WRSIZE    = ACCESS_16_BIT;
    g_dmaCTRLPKT_TX.TTYPE     = BLOCK_TRANSFER;  // tried FRAME_TRANSFER too
    g_dmaCTRLPKT_TX.ADDMODERD = ADDR_INC1;
    g_dmaCTRLPKT_TX.ADDMODEWR = ADDR_FIXED;
    g_dmaCTRLPKT_TX.AUTOINIT  = AUTOINIT_OFF;   //tried AUTOINIT_On too

    dmaSetCtrlPacket(DMA_CH0, g_dmaCTRLPKT_TX);
}

void mibspi3_DMA_configure(void)
{
    uint8 bufid  = TG0_LENGTH - 1;

    mibspiREG3->DMACTRL[0] = (uint32)0;                         // Clear before setting
    mibspiREG3->DMACTRL[0] |= (uint32)(1 << 31);                // ONESHOT = 1
    mibspiREG3->DMACTRL[0] |= (uint32)(14 << 16);               // TXDMA_MAP = 14 (MibSPI3 TX)
    mibspiREG3->DMACTRL[0] |= (uint32)(1 << 14);                // TXDMAENA = 1
    mibspiREG3->DMACTRL[0] |= (uint32)(1 << 13);                // NOBRK = 1
    mibspiREG3->DMACTRL[0] |= (uint32)(bufid << 9);             // ICOUNT = TG0_LENGTH - 1
}

int main(void)
{
    mibspiInit();
    gioInit();
	dmaReqAssign(DMA_CH0, MIBSPI3_TX_REQLINE); // MibSPI3_TX = DMA_REQ14
	
    dmaSetupForMibspi3_Tx();

    dmaEnable();
    
    dmaSetChEnable(DMA_CH0, DMA_SW);
	
	mibspi3_DMA_configure();

//    mibspiSetData(mibspiREG3, 0, tx_data);  // for trying with out DMA 

    mibspiTransfer(mibspiREG3, 0); 

    while(!(mibspiIsTransferComplete(mibspiREG3, 0)));

    while(1);
	// I will be verifying the data in Logic analyzer so i am not using mibspiGetData();
}