One question of TMDX470MF066HDK SPI2 data transfer

Legend Chang

I am using TMDX470MF066HDK eval board and try to use SPI for I2C control. I just write a 2 word length in buff and send it out. But I always watched 128 bit length data and clock from SPI2 pins. My source code as below:

 unsigned short SPI_data[2];
	    
 for (i = 0 ; i <2 ; i++ )
 {
 SPI_data[i]= 0xAA;
 };

 spiSetData ( spiREG3 , 0 , SPI_data );
 spiTransfer( spiREG3 , 0);

the green part is the waveform of SIMO and the red part is clock.

over 14 years ago

0 Legend Chang over 14 years ago

Prodigy 130 points

how do I send the 2 word only , not including the other (128 - 32) bits?

0 Haixiao Weng over 14 years ago in reply to Legend Chang

TI__Genius 13810 points

Sounds like you configure the wrong length of the transfer group 0 (TG)).

Please find the spi init routine, look for sth like:

/** - inialise transfer groups */

spiREG2->TGCTRL[0] = (1 << 30)

/* oneshot */

| (1 << 29)

/* pcurrent reset */

| (TRG_ALWAYS << 20)

/* trigger event */

| (TRG_DISABLED << 16)

/* trigger source */

| (0 << 8);

/* start buffer */

spiREG2->TGCTRL[1] = (1 << 30)

/* oneshot */

| (0 << 29)

/* pcurrent reset */

| (TRG_ALWAYS << 20)

/* trigger event */

| (TRG_DISABLED << 16)

/* trigger source */

| (8 << 8);

/* start buffer */

And please modify the red font into |2<<8)

Regards,

Haixiao

0 Legend Chang over 14 years ago in reply to Haixiao Weng

Prodigy 130 points

Haixiao,

Thanks, it works.

Legend

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One question of TMDX470MF066HDK SPI2 data transfer