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micropython/examples/asmled.py
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# flash LED #1 using inline assembler | |
# this version is overly verbose and uses word stores | |
# | |
# ruff: noqa: F821 - @asm_thumb decorator adds names to function scope | |
@micropython.asm_thumb | |
def flash_led(r0): | |
movw(r1, (stm.GPIOA + stm.GPIO_BSRRL) & 0xFFFF) | |
movt(r1, ((stm.GPIOA + stm.GPIO_BSRRL) >> 16) & 0x7FFF) | |
movw(r2, 1 << 13) | |
movt(r2, 0) | |
movw(r3, 0) | |
movt(r3, 1 << 13) | |
b(loop_entry) | |
label(loop1) | |
# turn LED on | |
str(r2, [r1, 0]) | |
# delay for a bit | |
movw(r4, 5599900 & 0xFFFF) | |
movt(r4, (5599900 >> 16) & 0xFFFF) | |
label(delay_on) | |
sub(r4, r4, 1) | |
cmp(r4, 0) | |
bgt(delay_on) | |
# turn LED off | |
str(r3, [r1, 0]) | |
# delay for a bit | |
movw(r4, 5599900 & 0xFFFF) | |
movt(r4, (5599900 >> 16) & 0xFFFF) | |
label(delay_off) | |
sub(r4, r4, 1) | |
cmp(r4, 0) | |
bgt(delay_off) | |
# loop r0 times | |
sub(r0, r0, 1) | |
label(loop_entry) | |
cmp(r0, 0) | |
bgt(loop1) | |
# flash LED #2 using inline assembler | |
# this version uses half-word sortes, and the convenience assembler operation 'movwt' | |
@micropython.asm_thumb | |
def flash_led_v2(r0): | |
# get the GPIOA address in r1 | |
movwt(r1, stm.GPIOA) | |
# get the bit mask for PA14 (the pin LED #2 is on) | |
movw(r2, 1 << 14) | |
b(loop_entry) | |
label(loop1) | |
# turn LED on | |
strh(r2, [r1, stm.GPIO_BSRRL]) | |
# delay for a bit | |
movwt(r4, 5599900) | |
label(delay_on) | |
sub(r4, r4, 1) | |
cmp(r4, 0) | |
bgt(delay_on) | |
# turn LED off | |
strh(r2, [r1, stm.GPIO_BSRRH]) | |
# delay for a bit | |
movwt(r4, 5599900) | |
label(delay_off) | |
sub(r4, r4, 1) | |
cmp(r4, 0) | |
bgt(delay_off) | |
# loop r0 times | |
sub(r0, r0, 1) | |
label(loop_entry) | |
cmp(r0, 0) | |
bgt(loop1) | |
flash_led(5) | |
flash_led_v2(5) |