43 lines
587 B
ArmAsm
43 lines
587 B
ArmAsm
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_start:
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ldr r0, _flashbase
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ldr r1, _addr
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mov r2, pc
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add r2, #(_data - . - 2)
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ldr r3, _size
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ldr r5, _flash_write_cmd
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_next:
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cbz r3, _done
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@ Write address to FMA
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str r1, [r0]
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@ Write data to FMD
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ldr r4, [r2]
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str r4, [r0, #4]
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@ Write WRITE bit to FMC
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str r5, [r0, #8]
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_wait: @ Wait for WRITE bit to clear
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ldr r4, [r0, #8]
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mov r6, #1
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tst r4, r6
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bne _wait
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sub r3, #1
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add r1, #4
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add r2, #4
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b _next
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_done:
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bkpt
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@.align 4
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.org 0x28
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_flashbase:
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.word 0x400FD000
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_flash_write_cmd:
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.word 0xA4420001
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_addr:
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.word 0
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_size:
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.word 4
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_data:
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.string "Hello World!\n\0\0\0"
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