ransmit data from slave ADUC845 device don't work. In first trasmition master read 0xAA 0xFF 0xFF 0xFF and in next trasmition 0xFF 0xFF 0xFF 0xFF. Data on SPI readed via logic analyzer simultaneously. Master receieved correctly.
How do i correctly trasmiting?
ORG 00h
JMP main
ORG 3Bh ;SPI interrupt
XCH A, SPIDAT
RETI
main:
MOV PLLCON, #01h ;f core = 6,29MHz, max for 3V ADUC845 device
MOV PCON, #10h ;ALE -> OFF
MOV CFG845, #01h ;use internal XRAM
MOV SP, #80h ;stack to indirectly adressed memory
MOV SPICON , #0Ch ;SPI Mode 3, Slave
MOV IEIP2, #11h ;SPI interrupt enabled with high priority
SETB IE_EA ;interrupts enabled
SETB SPICON_SPE ;SPI -> ON
MOV SPIDAT, #0AAh
loop:
MOV A, #55h
JMP loop
