12Programming Model
12 – 9
{code starts here}
{load interrupt vector addresses}
JUMP restarter; NOP; NOP; NOP; {restart interrupt}
RTI; NOP; NOP; NOP; {IRQ2 interrupt}
RTI; NOP; NOP; NOP; {HIP write interrupt}
RTI; NOP; NOP; NOP; {HIP read interrupt}
RTI; NOP; NOP; NOP; {SPORT0 transmit int}
JUMP fir_start; NOP; NOP; NOP; {SPORT0 receive int}
RTI; NOP; NOP; NOP; {SPORT1 transmit int}
RTI; NOP; NOP; NOP; {SPORT1 receive int}
RTI; NOP; NOP; NOP; {TIMER interrupt}
{initializations}
restarter: L0=%data_buffer; {setup circular buffer length}
L4=%coefficient; {setup circular buffer length}
M0=1; {modify=1 for increment through buffers}
M4=1;
I0=^data_buffer; {point to data start}
I4=^coefficient; {point to coeff start}
CNTR=%data_buffer;
DO clear UNTIL CE; {clear data buffer}
clear: DM(I0,M0)=0;
{set up memory-mapped control registers}
AX0=191;
DM(0x3FF4)=AX0; {set up divide value for 8KHz RFS}
AX0=3;
DM(0x3FF5)=AX0; {1.536MHz internal serial clock}
AX0=0x69B7;
DM(0x3FF6)=AX0; {multichannel disabled}
{internally generated serial clock}
{receive frame sync required}
{receive width 0}
{transmit frame sync required}
{transmit width 0}
{int transmit frame sync disabled}
{int receive frame sync enabled}
{u-law companding}
{8 bit words}
AX0=0x7000;
DM(0x3FFE)=AX0; {DM wait states: }
{ 0x3400-0x37FF 7 waits}
{ all else 0 waits}
AX0=0x1000;
DM(0x3FFF)=AX0; {SPORT0 enabled}
{boot from boot page 0}
{0 PM waits}
{0 boot memory waits}
ICNTL = 0x00;
IMASK = 0x0018; {enable SPORT0 interrupt only}
mainloop: IDLE; {wait for interrupt}
JUMP mainloop;
.ENDMOD;
Listing 12.1 Program Example Listing (Setup & Main Loop Routine)
C
D
E
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