35 lines
911 B
Plaintext
35 lines
911 B
Plaintext
;
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; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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;
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; SPDX-License-Identifier: BSD-3-Clause
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;
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; SET pin 0 should be mapped to your LED GPIO
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.program blink
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pull block
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out y, 32
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.wrap_target
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mov x, y
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set pins, 1 ; Turn LED on
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lp1:
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jmp x-- lp1 ; Delay for (x + 1) cycles, x is a 32 bit number
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mov x, y
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set pins, 0 ; Turn LED off
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lp2:
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jmp x-- lp2 ; Delay for the same number of cycles again
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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 = 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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