82 lines
1.5 KiB
Python
82 lines
1.5 KiB
Python
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# flash LED #1 using inline assembler
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@micropython.asm_thumb
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def flash_led(r0):
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movw(r1, (stm.GPIOA + stm.GPIO_BSRRL) & 0xffff)
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movt(r1, ((stm.GPIOA + stm.GPIO_BSRRL) >> 16) & 0x7fff)
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movw(r2, 1 << 13)
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movt(r2, 0)
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movw(r3, 0)
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movt(r3, 1 << 13)
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b(loop_entry)
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label(loop1)
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# turn LED on
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str(r2, r1, 0)
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# delay for a bit
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movw(r4, 5599900 & 0xffff)
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movt(r4, (5599900 >> 16) & 0xffff)
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label(delay_on)
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subs(r4, r4, 1)
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cmp(r4, 0)
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bgt(delay_on)
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# turn LED off
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str(r3, r1, 0)
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# delay for a bit
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movw(r4, 5599900 & 0xffff)
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movt(r4, (5599900 >> 16) & 0xffff)
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label(delay_off)
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subs(r4, r4, 1)
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cmp(r4, 0)
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bgt(delay_off)
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# loop r0 times
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subs(r0, r0, 1)
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label(loop_entry)
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cmp(r0, 0)
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bgt(loop1)
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# flash LED #1 using inline assembler
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# this version uses the convenience assembler operation 'movwt'
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@micropython.asm_thumb
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def flash_led_v2(r0):
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movwt(r1, stm.GPIOA + stm.GPIO_BSRRL)
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movwt(r2, 1 << 13)
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movwt(r3, 1 << (16 + 13))
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b(loop_entry)
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label(loop1)
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# turn LED on
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str(r2, r1, 0)
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# delay for a bit
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movwt(r4, 5599900)
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label(delay_on)
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subs(r4, r4, 1)
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cmp(r4, 0)
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bgt(delay_on)
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# turn LED off
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str(r3, r1, 0)
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# delay for a bit
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movwt(r4, 5599900)
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label(delay_off)
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subs(r4, r4, 1)
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cmp(r4, 0)
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bgt(delay_off)
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# loop r0 times
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subs(r0, r0, 1)
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label(loop_entry)
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cmp(r0, 0)
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bgt(loop1)
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flash_led_v2(5)
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