# MMIO 验证程序：写 LED 寄存器（0x0000_1000）-> 读回 -> 字节写 -> 再读回。
# 期望 LED 输出顺序（共 4 次，见同目录 mmio_test.expected）：
#   ① 12345678  sw 0x12345678
#   ② 12345678  lw 读回后再 print
#   ③ ffffffff  sw 0xffffffff
#   ④ ffff7fff  sb 0x7f 覆盖 led[15:8] 后读回
# 用法：python tools/rv_asm.py testbench/programs/mmio_test.asm <仿真工作目录>/risc-v-benchmark_ccab.hex
    lui   t0, 0x1               # t0 = LED_ADDR = 0x00001000

    lui   t1, 0x12345
    addi  t1, t1, 0x678         # t1 = 0x12345678
    sw    t1, 0(t0)             # ① MMIO 写 LED
    lw    a0, 0(t0)             # MMIO 读回
    print                       # ② 应为 12345678

    addi  t2, zero, -1          # t2 = 0xffffffff
    sw    t2, 0(t0)             # ③ 应为 ffffffff

    addi  t3, zero, 0x7f
    sb    t3, 1(t0)             # 字节写：led[15:8] = 0x7f
    lw    a0, 0(t0)             # 读回
    print                       # ④ 应为 ffff7fff

    halt