Hello,
I'm trying to connect an external EEPROM via SPI to a MPC5554. At the document "Qorivva Simple Cookbook “Hello World” Programs to Exercise Common Features on MPC5500 & MPC5600 Microcontrollers" I found an example code to perform a single transfer from DSPI_C to DSPI_D. This programm works very fine. But now I want to replace the DSPI_D on the MPC5554 with an external EEPROM.
Here is the code from the example with my ideas:
// no changes, because the master on the MPC5554 still sets the system clock
void initSysclk (void) {
FMPLL.SYNCR.R = 0x16080000;
while (FMPLL.SYNSR.B.LOCK != 1) {};
FMPLL.SYNCR.R = 0x16000000;
}
// also no changes, because DSPI_C is the master
void initDSPI_C(void) {
DSPI_C.MCR.R = 0x80010001; /* Configure DSPI_C as master */
DSPI_C.CTAR[0].R = 0x780A7727; /* Configure CTAR0 */
DSPI_C.MCR.B.HALT = 0x0; /* Exit HALT mode: go from STOPPED to RUNNING state*/
SIU.PCR[107].R = 0x0A00; /* MPC555x: Config pad as DSPI_C SOUT output */
SIU.PCR[108].R = 0x0900; /* MPC555x: Config pad as DSPI_C SIN input */
SIU.PCR[109].R = 0x0A00; /* MPC555x: Config pad as DSPI_C SCK output */
SIU.PCR[110].R = 0x0A00; /* MPC555x: Config pad as DSPI_C PCS0 output */
}
void initDSPI_D(void) {
// delete this funktion, because the external EEPROM just need hardwire signals SOUT, SIN, SCK and PCS0 from master
}
void ReadDataDSPI_D(void) {
// no ideas how to read from the slave
}
void ReadDataDSPI_C(void) {
// no ideas how to read from the slave
}
int main(void) {
initSysclk();
initDSPI_C();
initDSPI_D();
DSPI_D.PUSHR.R = 0x00001234;
DSPI_C.PUSHR.R = 0x08015678;
ReadDataDSPI_D(); /* Read data on slave DSPI */
ReadDataDSPI_C(); /* Read data on master DSPI */
while (1) {i++; } /* Wait forever */
}
It would be nice, if someone could help me.
Thanks and best regards
Flo
