SPI slave with DMAX

ajay kathi

Other Parts Discussed in Thread: SPRC223

Hi,

I want to use SPI0 as slave and it has to use DMAX for data transfer.To test this i connected SPI1 with SPI0 on EVM-C6727 board.I configured SPI1 as master

and SPI0 as slave.I observed SPI0 is able to receive data whatever i send through SPI1 with out dmax.

Then i introdused DMAX to transfer SPIOBUF register contents to one internal buffer(dmaxDest).

I configured DMAX with lopriority EVENT-13 and parameter entry -0 .But internal buffer(dmaxDest) is not updating ,only SPIOBUF contents are changing when i try to

send 16-bit word from SPI1.

I do not know what was missing in DMAX configuration.I am sharing the code

/* Variable to check the Transfer Complete Interrupt generated */

Uint32 dmaxTcValue = TC_PASS;

/* Interrupt handle */
CSL_IntcHandle hIntc;
CSL_IntcEventEnableState eventStat;
CSL_IntcDispatcherContext intcDispatcherContext;

/* DMAX */
CSL_DmaxObj dmaxEvent;
CSL_DmaxHandle hDmax;
CSL_DmaxHwSetup hwSetupDmax;
CSL_DmaxGPTransferEventSetup gpxfrEventSetup;
CSL_DmaxGPXFRParameterSetup gpxfrParameterSetup;

/* Data buffers */
Uint32 dmaxDest;
/* status variable */
CSL_Status status=CSL_SOK;

void main(void)
{

CSL_intcSetVectorPtr (ISTP_VECTOR_VALUE);
/* Initialize DMAX CSL module */
status = CSL_dmaxInit (NULL);

if (status != CSL_SOK) {
return status;
}

/*Relocating Interrupt Vector Table */
CSL_intcSetVectorPtr (ISTP_VECTOR_VALUE);

/* Low Priority Event1 */
//dmaxEvent.eventUid = CSL_DMAX_LOPRIORITY_EVENT1_UID;
dmaxEvent.eventUid = CSL_DMAX_LOPRIORITY_SPI0RX_UID;

/* Low Priority Parameter entry0 */
dmaxEvent.paramUid = CSL_DMAX_LOPRIORITY_PARAMETERENTRY0_UID;

/* DMAX Handle by calling CSL_dmaxOpen Call */
hDmax = CSL_dmaxOpen (&dmaxEvent, CSL_DMAX, NULL, &status);

if (status != CSL_SOK || (hDmax == (CSL_DmaxHandle) CSL_DMAX_BADHANDLE)) {
status = CSL_ESYS_BADHANDLE;
return status;
}

hDmax->regs->DELPR = 0x2000;
hDmax->regs->LoPriorityEventTable.EVENT13 = 0x302A0A2;
hDmax->regs->LoMaxParam->WORD0 = (unsigned int)&dmaxDest;
hDmax->regs->LoMaxParam->WORD1 = (unsigned int)&dmaxDest;
hDmax->regs->LoMaxParam->WORD2 = SPIBUFSIZE;
hDmax->regs->LoMaxParam->WORD3 = SPIBUFSIZE;
hDmax->regs->LoMaxParam->WORD4 = (unsigned int)&dmaxDest;
hDmax->regs->LoMaxParam->WORD5 = (unsigned int)&dmaxDest;
hDmax->regs->LoMaxParam->WORD6 = (unsigned int)&dmaxDest;
hDmax->regs->LoMaxParam->WORD7 = (unsigned int)&dmaxDest;

hDmax->regs->DEPR = 0x2000;
hDmax->regs->DEER = 0x2000;

}

please help me regarding this

Thanks & Regards,

Ajay Reddy.

over 15 years ago

0 TimHarron over 15 years ago

TI__Mastermind 18130 points

Please see this thread as I think it may help you overcome your hurdle:

http://e2e.ti.com/forums/p/906/2734.aspx#2734

0 ajay reddy over 15 years ago in reply to TimHarron

Prodigy 50 points

Thank you TimHarron,

I got solution from the same link what ever you sent to me.

Thanks & Regards,

Ajay Reddy.

0 Pan Kim over 14 years ago in reply to TimHarron

Prodigy 30 points

Why this link is failured? http://e2e.ti.com/forums/p/906/2734.aspx#2734 And i find there has any error on dMax serviced to SPI slave too:

1) CSL_dmaxHwSetup() can not well configure SPI dMax and will generate error code "-67" meaning fault etype.

2) CSL_dmaxHwSetupSpiParam() quoted by before function is missed to set ESIZE of SPI element size.

Commnet: CSL_dmaxHwSetup() and CSL_dmaxHwSetupSpiParam() is extracted from sprc223 -> csl_672x_src_03_00_09_00.zip

Do there have new info on about dMax and SPI ?

0 RickyZhang over 13 years ago in reply to TimHarron

Prodigy 100 points

Hi, Tim

I can't open the webpage http://e2e.ti.com/forums/p/906/2734.aspx#2734, it's redirected to another page.

Could you recall the solution on the original page, or could you give some advice on this not-updating problem? I'm struggling here...

Thanks,

Ricky

0 Rahul Prabhu over 13 years ago in reply to RickyZhang

TI__Guru** 116170 points

Ricky,

Tim was perhaps refering to this thread:

http://e2e.ti.com/support/dsp/tms320c6000_high_performance_dsps/f/115/p/12203/47540.aspx#47540

Regards,

Rahul

0 RickyZhang over 13 years ago in reply to Rahul Prabhu

Prodigy 100 points

Rahul,

Thanks! I add the code given by Balachandra in that thread and it works. The dMAX can transmit data from SPIBUF to destination address properly now.

But I got another problem. To test SPI slave transfer, I plug two lines to SPI0_CLK and SPI0_SIMO on PADK, and use a signal generator send CLK and data to C6727.

The SPI clocking mode I used is POLARITY=1, PHASE=1. When I send 16-bit word 0x5AA5, what I receive in SPIBUF is 0x2D52. That is,

5AA5: 01011010 10100101
2D52: 00101101 01010010

so a '0' is improperly sampled at the beginning of each 16-bit word.

I watched the SPI_CLK and SPI_SIMO signal out of signal generator , and they are in right format.

Could you give some advice on my problem?

Thanks,

Ricky

0 Rahul Prabhu over 13 years ago in reply to RickyZhang

TI__Guru** 116170 points

Ricky,

Could you further describe your setup. Is this 3 pin mode ? If not, are you driving enable or chip select? What is the clock speed?

Have you tried any other Polarity and phase settings? Can you capture the waveforms of the first transfer and post it here.

Regards,

Rahul

0 RickyZhang over 13 years ago in reply to Rahul Prabhu

Prodigy 100 points

Rahul,

Thanks for your replies, I change to another clocking mode and everything seems fine. I'll look into the previous mode to find out what was wrong.

Thanks again,

Ricky

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SPI slave with DMAX