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micropython/examples/asmled.py

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examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
# flash LED #1 using inline assembler
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
# this version is overly verbose and uses word stores
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
@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
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
str(r2, [r1, 0])
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
# delay for a bit
movw(r4, 5599900 & 0xffff)
movt(r4, (5599900 >> 16) & 0xffff)
label(delay_on)
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
sub(r4, r4, 1)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
cmp(r4, 0)
bgt(delay_on)
# turn LED off
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
str(r3, [r1, 0])
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
# delay for a bit
movw(r4, 5599900 & 0xffff)
movt(r4, (5599900 >> 16) & 0xffff)
label(delay_off)
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
sub(r4, r4, 1)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
cmp(r4, 0)
bgt(delay_off)
# loop r0 times
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
sub(r0, r0, 1)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
# flash LED #2 using inline assembler
# this version uses half-word sortes, and the convenience assembler operation 'movwt'
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
@micropython.asm_thumb
def flash_led_v2(r0):
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
# 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)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
b(loop_entry)
label(loop1)
# turn LED on
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
strh(r2, [r1, stm.GPIO_BSRRL])
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
# delay for a bit
movwt(r4, 5599900)
label(delay_on)
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
sub(r4, r4, 1)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
cmp(r4, 0)
bgt(delay_on)
# turn LED off
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
strh(r2, [r1, stm.GPIO_BSRRH])
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
# delay for a bit
movwt(r4, 5599900)
label(delay_off)
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
sub(r4, r4, 1)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
cmp(r4, 0)
bgt(delay_off)
# loop r0 times
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
sub(r0, r0, 1)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
label(loop_entry)
cmp(r0, 0)
bgt(loop1)
py: Big improvements to inline assembler. Improved the Thumb assembler back end. Added many more Thumb instructions to the inline assembler. Improved parsing of assembler instructions and arguments. Assembler functions can now be passed the address of any object that supports the buffer protocol (to get the address of the buffer). Added an example of how to sum numbers from an array in assembler.
2014-04-13 00:30:32 +01:00
flash_led(5)
examples: Add example script to flash an LED using inline assembler.
2014-04-12 18:27:23 +01:00
flash_led_v2(5)