mirror of
https://github.com/WangXuan95/USTC-RVSoC.git
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31 lines
1.3 KiB
ArmAsm
31 lines
1.3 KiB
ArmAsm
.org 0x0
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.global _start
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_start:
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# 第一步：令t0寄存器=0x00030000，即user_uart外设的地址
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or t0, zero,zero # t0 清零
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lui t0, 0x00030 # t0 寄存器的高20bit=0x00020
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# 第二步：将hello!逐个字符写入user_uart外设，即打印hello!到uart
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print_hello:
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ori t1, zero, 0x068 # t1='h'的ASCII码
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sb t1, (t0) # t1写入t0地址
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ori t1, zero, 0x065 # t1='e'的ASCII码
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sb t1, (t0) # t1写入t0地址
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ori t1, zero, 0x06c # t1='l'的ASCII码
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sb t1, (t0) # t1写入t0地址
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ori t1, zero, 0x06c # t1='l'的ASCII码
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sb t1, (t0) # t1写入t0地址
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ori t1, zero, 0x06f # t1='o'的ASCII码
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sb t1, (t0) # t1写入t0地址
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ori t1, zero, 0x021 # t1='!'的ASCII码
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sb t1, (t0) # t1写入t0地址
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ori t1, zero, 0x00a # t1='\n'的ASCII码
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sb t1, (t0) # t1写入t0地址
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# 第三步：延时，通过大空循环的方式
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lui t2, 0x00200 # t2 = 0x00800000
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big_loop:
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addi t2, t2, -1 # t2 = t2-1
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bne t2, zero, big_loop # if t2!=0, jmp to big_loop
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jal zero, print_hello # 大循环结束，跳到print_hello，重复打印
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