spi.avr contains assembler code for a target (ATMEL AVR).

What needs to be defined (example settings):
 
.equ    MISO_PORTDIR = DDRB
.equ    MISO_PIN  = 6

nSPIDebugState:  .BYTE 1
nSPIDebug_AdrL:  .BYTE 1
nSPIDebug_AdrH:  .BYTE 1

Jump to _isr_SPI on SPI interrupt.

