Subversion Repositories eco32

;

; echo.s -- test the serial interface

;

        .set    sba,0xF0300000  ; serial base address

        add     $8,$0,sba        ; set serial base address

L1:

        ldw     $9,$8,0          ; load receiver status into $9

        and     $9,$9,1         ; check receiver ready

        beq     $9,$0,L1 ; loop while not ready

        ldw     $10,$8,4        ; load receiver data into $10

        add     $10,$10,0x5C

        and     $10,$10,0xFF

L2:

        ldw     $9,$8,8         ; load transmitter status into $9

        and     $9,$9,1         ; check transmitter ready

        beq     $9,$0,L2 ; loop while not ready

        stw     $10,$8,12       ; load char into transmitter data

        j       L1              ; all over again