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 parse-bytecode

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asmled.py

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# flash LED #1 using inline assembler

# this version is overly verbose and uses word stores

@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)