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35 lines
728 B
ArmAsm
35 lines
728 B
ArmAsm
/* ARM Thumb Assembler code */
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// arm-none-eabi-gcc -Wa,-amhls=opt_bytes_write.lst -c opt_bytes_write.S
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#define FLASH_CR_OPTPG 0x0010
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#define FLASH_SR_BSY 0x0001
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#define FLASH_SR_OFFSET 0x0c
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#define FLASH_CR_OFFSET 0x10
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.cpu cortex-m0
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.thumb
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ldr r0, .OPTION_BYTES
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ldr r1, .TARGET_ADDR
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ldr r2, .FLASH_BASE_ADDR
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mov r3, #FLASH_CR_OPTPG
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mov r4, #FLASH_SR_BSY
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str r3, [r2, #FLASH_CR_OFFSET]
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strh r0, [r1]
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1: ldr r0, [r2, #FLASH_SR_OFFSET]
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tst r0, r4
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bne 1b
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add r1, #2
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mov r0, #255
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strh r0, [r1]
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2: ldr r0, [r2, #FLASH_SR_OFFSET]
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tst r0, r4
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bne 2b
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mov r0, #0
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str r0, [r2, #FLASH_CR_OFFSET]
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bkpt #0x00
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.align 2
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.FLASH_BASE_ADDR: .word 0x40022000
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.TARGET_ADDR: .word 0x1FFFF800
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.OPTION_BYTES: .word 0x00000000
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