kopia lustrzana https://github.com/stlink-org/stlink
50 wiersze
711 B
ArmAsm
50 wiersze
711 B
ArmAsm
.syntax unified
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.text
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/*
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* Arguments:
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* r0 - source memory ptr
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* r1 - target memory ptr
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* r2 - count of bytes
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* r3 - flash register offset
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*/
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.global copy
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copy:
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ldr r12, flash_base
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ldr r10, flash_off_sr
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add r10, r10, r12
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loop:
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# copy 4 bytes
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ldr r4, [r0]
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str r4, [r1]
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# increment address
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add r0, r0, #4
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add r1, r1, #4
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# memory barrier
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dsb sy
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wait:
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# get FLASH_SR
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ldrh r4, [r10]
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# wait until BUSY flag is reset
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tst r4, #0x1
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bne wait
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# loop if count > 0
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subs r2, r2, #4
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bgt loop
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exit:
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bkpt
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.align 2
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flash_base:
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.word 0x40023c00
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flash_off_sr:
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.word 0x0e
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