Hi,

I am trying to interface and SD card with 89C51ED2 using the SPI interface. I have set the microcontroller in master mode. According to SPI spec, first I need to send 0xff for 74 clock cycles. However, the SPIF bit (in SPSTA register) does not seem to get cleared.

I have the following code to send/rcv a byte:
char SPI_byte(char c) {
char rcv;

SPDAT = c;
while(!SPIF_SET());
rcv = SPDAT;

return rcv;
}

The code loops forever in the while. I have the following setting:
Master, mode 0, Fosc clock/128

Any suggestions ?

thanks,
-siddharth