Porting SPI Driver to Keil RL-ARM System: SendBuf

tfrauenrath — Wed, 03 Jul 2013 13:55:30 GMT

My task is to port a NXP SPI driver delivered with Keil RL-ARM to my Kinetis K60 system. Finlay I want to talk to SD cards in SPI mode. I do this step by step. My next task is the Send routine.

RL-ARM User's Guide: spi.SendBuf Library Routine

This is the original NXP Send:

static BOOL SendBuf (U8 *buf, U32 sz) {
  /* Send buffer to SPI interface. */
  U32 i;

  for (i = 0; i < sz; i++) {
  SSPDR = buf[i];
  /* Wait if Tx FIFO is full. */
  while (!(SSPSR & TNF));
  SSPDR;
  }
  /* Wait until Tx finished, drain Rx FIFO. */
  while (SSPSR & (BSY | RNE)) {
  SSPDR;
  }
  return (__TRUE);
}

This my first trial for the Kinetis SendBuf:

/*--------------------------- SendBuf ---------------------------------------*/
static BOOL SendBuf (U8 *buf, U32 sz) 
{/* Send buffer to SPI interface. */
U32 i;    

for (i = 0; i < sz; i++) 
 {
    SPI2->PUSHR = (SPI_PUSHR_PCS(2) || buf[i]);
  while ((SPI2->SR & SPI_SR_TFFF_MASK) == 0) {};
  while ((SPI2->SR & SPI_SR_RFDF_MASK) == 0) {};
  }
SPI2->SR = (SPI_SR_TFFF_MASK || (SPI2->SR & SPI_SR_RFDF_MASK));         
return (__TRUE);
}

Do you think this is applicable for SD card access via SPI?

I will discuss the other routines in other threads because of a better overview. I will post the final driver, because Keil provides only samples for SDHC mode for memory cards for the Kinetis system.

Thank you

topic Porting SPI Driver to Keil RL-ARM System: SendBuf in Kinetis Microcontrollers

Porting SPI Driver to Keil RL-ARM System: SendBuf