TMS570LC4357: SPI

john young

Intellectual 500 points

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Using :Launchpad TMS570lc43x /RM57Lx, Launchpad XL2

configured, in halcogen:

SPI

basically only SPI1...just want to run that spi bus..

Setup:

MIBSPI1CLK = pin f18 = Booster pak 2 pin j5- 7

MIBSPI1NCS[0] = pin R2 = Booster pak 2 pin j6-3

MIBSPI1SIMO[0] = pin F19 = Booster pak 2 pin j6- 6

MIBSPI1SOMI[0] = pin G18 = Booster pak 2 pin j6-7

set all other NCS pins to GPIO (in halcogen)..only NCS[0]SPI based.

made sure no conflicts in PINMUX....

run code..using this funtion: uint32 spiTransmitAndReceiveData(spiBASE_t *spi, spiDAT1_t *dataconfig_t, uint32 blocksize, uint16 * srcbuff, uint16 * destbuff)

run code.

se clk, data...no CS....??????

checking registers while running....

(i.e. DAT1)...I see bit 28=1, I see CSNR = 0x37...(which is confusing based on Table 28-25 in SPNU563A, Herc Ref manual.....why are that many /cs activated for one transfer????)

anyway.....confused...

just trying to do a "simple" send spi data..

Any thoughts/insight/help appreciated.

per SOP, apprectiate any and all responses...

cheers

over 3 years ago

0 QJ Wang over 3 years ago

TI__Guru**** 198766 points

Hi John,

If CS0 is used to select the SPI device, the CSNR should be 0x3E or 0xFE.

What is the value of dataconfig_t in your code?

dataconfig1_t.CS_HOLD = FALSE;
dataconfig1_t.WDEL = FALSE;
dataconfig1_t.DFSEL = SPI_FMT_0;
dataconfig1_t.CSNR = 0xFE;

0 john young over 3 years ago

Intellectual 500 points

ok...

checked that CNSR value...it wasnt 3E or FE...it was x37....

I'm guessing based on Halcogen setup...(?)......

i then forced the CSNR to 3E in the function (uint32 spiTransmitAndReceiveData(spiBASE_t *spi, spiDAT1_t *dataconfig_t, uint32 blocksize, uint16 * srcbuff, uint16 * destbuff)...just as a test...

still no /CS at R2?...

I tried various settings for CSNR similarly (i.e. based on table in ref manual)..i probed all CS attached to SPI 1...nothing....?

heres how I did that (testing)

uint32 spiTransmitAndReceiveData(spiBASE_t *spi, spiDAT1_t *dataconfig_t, uint32 blocksize, uint16 * srcbuff, uint16 * destbuff)
{
uint16 Tx_Data;
uint32 Chip_Select_Hold = (dataconfig_t->CS_HOLD) ? 0x10000000U : 0U;
uint32 WDelay = (dataconfig_t->WDEL) ? 0x04000000U : 0U;
SPIDATAFMT_t DataFormat = dataconfig_t->DFSEL;
uint8 ChipSelect = dataconfig_t->CSNR;
ChipSelect = 0x3EU;

again, I see clock, dataout, etc....but no cs

I am sure I am missing something simple...but cant figure out what it is...?

All i'm doing is trying to write out the spi port, in a while loop..just to see things happen.

apprecaite your expertise and help in this....per SOP.

thank you very very much