examples/asmled.py · caimouse/MicroPython

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MicroPython

examples

asmled.py

asmled.py 1.64 KB

# 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)

一键复制编辑原始数据按行查看历史

caimouse 提交于 2019年12月06日 21:19 +08:00 . 1.9

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85

# 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)