kopia lustrzana https://github.com/oddwires/RP2040-code
36 wiersze
1.4 KiB
Plaintext
36 wiersze
1.4 KiB
Plaintext
.program pio_blink
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; Turn on LED for 1002 cycles and off for 1002 cycles.
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; Large delays are required to allow the State Machine to toggle at frequencies as low as 1Hz.
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; Note: Oscilloscope shows this runs about 2% fast indicating an issue with the cycle count.
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.wrap_target
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set pins, 1 ; Turn LED on
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set x,25
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; 2 cycles to this point
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label01:
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nop [19] ; 20 cycles
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nop [18] ; 19 cycles
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jmp x--, label01 ; 1 cycles
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; ; 2 + 25*(20+19+1) = 1002 cycles to this point
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; (restart cycle count)
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set pins, 0 ; Turn LED off
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set x,25
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; 2 cycles to this point
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label02:
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nop [19] ; 20 cycles
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nop [18] ; 19 cycles
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jmp x--, label02 ; 1 cycles
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; ; 2 + 25*(20+19+1) = 1002 cycles to this point
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.wrap ; Blink forever!
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% c-sdk {
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// this is a raw helper function for use by the user which sets up the GPIO output, and configures the SM to output on a particular pin
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void blink_program_init(PIO pio, uint sm, uint offset, uint pin) {
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pio_gpio_init(pio, pin);
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
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pio_sm_config c = pio_blink_program_get_default_config(offset);
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sm_config_set_set_pins(&c, pin, 1);
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pio_sm_init(pio, sm, offset, &c);
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}
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%}
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