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
