kopia lustrzana https://github.com/stlink-org/stlink
40 wiersze
847 B
ArmAsm
40 wiersze
847 B
ArmAsm
.global start
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.syntax unified
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@ Adapted from stm32f4.s
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@ STM32L4's flash controller expects double-word writes, has the flash
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@ controller mapped in a different location with the registers we care about
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@ moved down from the base address, and has BSY moved to bit 16 of SR.
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@ r0 = source
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@ r1 = target
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@ r2 = wordcount
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@ r3 = flash_base
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@ r4 = temp
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@ r5 = temp
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start:
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ldr r3, flash_base
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next:
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cbz r2, done
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ldr r4, [r0] /* copy doubleword from source to target */
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ldr r5, [r0, #4]
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str r4, [r1]
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str r5, [r1, #4]
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wait:
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ldrh r4, [r3, #0x12] /* high half of status register */
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tst r4, #1 /* BSY = bit 16 */
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bne wait
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add r0, #8
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add r1, #8
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sub r2, #1
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b next
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done:
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bkpt
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.align 2
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flash_base:
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.word 0x40022000
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