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[/] [eco32/] [tags/] [eco32-0.23/] [simtest/] [rom/] [rom06.s] - Rev 25
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; ; rom06.s -- "crossed" echo with two terminals, polled ; .set tba0,0xF0300000 ; terminal base address 0 .set tba1,0xF0301000 ; terminal base address 1 add $8,$0,tba0 ; set $8 to terminal base address 0 add $9,$0,tba1 ; set $9 to terminal base address 1 L1: ldw $10,$8,0 ; load receiver status into $10 and $10,$10,1 ; check receiver ready beq $10,$0,L3 ; not ready - check other terminal ldw $11,$8,4 ; load receiver data into $11 L2: ldw $10,$9,8 ; load transmitter status into $10 and $10,$10,1 ; check transmitter ready beq $10,$0,L2 ; loop while not ready stw $11,$9,12 ; load char into transmitter data L3: ldw $10,$9,0 ; load receiver status into $10 and $10,$10,1 ; check receiver ready beq $10,$0,L1 ; not ready - check other terminal ldw $11,$9,4 ; load receiver data into $11 L4: ldw $10,$8,8 ; load transmitter status into $10 and $10,$10,1 ; check transmitter ready beq $10,$0,L4 ; loop while not ready stw $11,$8,12 ; load char into transmitter data j L1 ; all over again
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