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We tried to link 2 DE2 boards together each connected to a seperate desktop computer. The goal was to write something in the Altera monitor terminal on one desktop and have it show up in the terminal of the other.
The code we ended up with didn't work and I'd be thankful if someone could read through it and see why it doesn't. This was the code used: .text .global _start _start: movia sp, 0x007FFFFC # Max stack value movia r6, 0x10001000 # Default address for the data register of JTAG movia r7, 0x10001010 # Default address for the data register of the serial port .macro PUSH reg subi sp, sp, 4 stw \reg, 0(sp) .endm .macro POP reg ldw \reg, 0(sp) addi sp, sp, 4 .endm MAIN_LOOP: call READ_JTAG call READ_SERIAL br MAIN_LOOP READ_JTAG: # Read data from the JTAG port ldwio r4, 0(r6) andi r8, r4, 0x8000 beq r8, r0, END_PUT andi r5, r4, 0x00ff PUSH r31 call WRITE_JTAG call WRITE_SERIAL POP r31 ret WRITE_JTAG: # Write data to the JTAG port ldwio r4, 4(r6) andhi r4, r4, 0xffff beq r4, r0, END_PUT stwio r5, 0(r6) ret READ_SERIAL:# Read data from the serial port ldwio r3, 0(r7) andi r8, r3, 0x8000 beq r8, r0, END_PUT andi r5, r3, 0x00ff PUSH r31 call WRITE_JTAG POP r31 ret WRITE_SERIAL: # Write data to the serial port ldwio r3, 4(r7) andhi r3, r3, 0xffff beq r3, r0, END_PUT stwio r5, 0(r7) ret END_PUT: ret .endLink Copied
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