Porting SPI Driver to Keil RL-ARM System: Send

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Porting SPI Driver to Keil RL-ARM System: Send

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tfrauenrath
Contributor III

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.Send Library Routine

This is the original NXP Send:

/* Send and receive a byte on SPI interface. */

static U8 Send (U8 outb) {

  SSPDR = outb;

  while (!(SSPSR & RNE)); /* Wait if RNE cleared, Rx FIFO is empty. */

  return (SSPDR);

}

This my first trial for the Kinetis Send:

/*--------------------------- Send ------------------------------------------*/

static U8 Send (U8 outb)

{/* Write and Read a byte on SPI interface. */

unsigned char tmp;

SPI2->PUSHR = (SPI_PUSHR_PCS(2) || outb);

while ((SPI2->SR & SPI_SR_TFFF_MASK) == 0) {};

while ((SPI2->SR & SPI_SR_RFDF_MASK) == 0) {};

tmp = SPI2->POPR;

SPI2->SR = (SPI_SR_TFFF_MASK || (SPI2->SR & SPI_SR_RFDF_MASK));

return (tmp); // return read byte   

}

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






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