MOV SPCTL,#40H ;Enable SPI slave mode and standby
MOV SPSTAT,#0C0H ;Clear interrupt flag
LOOP:
JB KEY,SKIP ;Wait for the key to trigger
MOV SPCTL,#50H ;Enable SPI master mode
CLR SS ;Pull down the slave SS pin
MOV SPDAT,#5AH ;Send test data
JNB KEY,$ ;Wait for the keys to be released
SKIP:
MOV A,SPSTAT
JNB ACC.7,LOOP
MOV SPSTAT,#0C0H ;Clear interrupt flag
MOV A,SPCTL
JB ACC.4,MASTER
SLAVE:
MOV SPDAT,SPDAT ;Transmit the received data back to the master
CPL LED
JMP LOOP
MASTER:
SETB SS ;Pull up the SS pin of the slave
MOV SPCTL,#40H ;Reset to slave and standby
CPL LED
JMP LOOP
END
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