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https://opencores.org/ocsvn/eco32/eco32/trunk
Subversion Repositories eco32
[/] [eco32/] [tags/] [eco32-0.23/] [hwtests/] [xcptest/] [serial.s] - Rev 248
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; ; serial.s -- the serial line interface ; ;*************************************************************** .set ser0base,0xF0300000 ; serial line 0 base address .set ser1base,0xF0301000 ; serial line 1 base address .export serinit ; initialize serial interface .export ser0inchk ; line 0 input check .export ser0in ; line 0 input .export ser0outchk ; line 0 output check .export ser0out ; line 0 output .export ser1inchk ; line 1 input check .export ser1in ; line 1 input .export ser1outchk ; line 1 output check .export ser1out ; line 1 output ;*************************************************************** .code .align 4 serinit: jr $31 ;*************************************************************** .code .align 4 ser0inchk: add $8,$0,ser0base ldw $2,$8,0 and $2,$2,1 jr $31 ser0in: add $8,$0,ser0base ser0in1: ldw $9,$8,0 and $9,$9,1 beq $9,$0,ser0in1 ldw $2,$8,4 jr $31 ser0outchk: add $8,$0,ser0base ldw $2,$8,8 and $2,$2,1 jr $31 ser0out: add $8,$0,ser0base ser0out1: ldw $9,$8,8 and $9,$9,1 beq $9,$0,ser0out1 stw $4,$8,12 jr $31 ;*************************************************************** .code .align 4 ser1inchk: add $8,$0,ser1base ldw $2,$8,0 and $2,$2,1 jr $31 ser1in: add $8,$0,ser1base ser1in1: ldw $9,$8,0 and $9,$9,1 beq $9,$0,ser1in1 ldw $2,$8,4 jr $31 ser1outchk: add $8,$0,ser1base ldw $2,$8,8 and $2,$2,1 jr $31 ser1out: add $8,$0,ser1base ser1out1: ldw $9,$8,8 and $9,$9,1 beq $9,$0,ser1out1 stw $4,$8,12 jr $31
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