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12
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1 ;
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2 ; Copyright (c) 2025 Daniel O'Connor
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3 ;
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4
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5 .program trigger
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6 .define TRIGGER_IRQ 0
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7
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8 .wrap_target
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9 ; Wait for trigger to be low
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10 wait 0 pin 0
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11 ; Wait for rising edge
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12 wait 1 pin 0
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13 ; Signal other state machine
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14 irq nowait TRIGGER_IRQ
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15 .wrap
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16
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17 % c-sdk {
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18 static inline void trigger_program_init(PIO pio, uint sm, uint offset, uint pin, uint clkdiv) {
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19 pio_sm_config c = trigger_program_get_default_config(offset);
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20
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21 // Configure SM input pin mapping to point to trigger pin
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22 sm_config_set_in_pins(&c, pin);
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23 // Set to input
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24 pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, false);
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25 // Connect this GPIO to this PIO block
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26 pio_gpio_init(pio, pin);
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27
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28 sm_config_set_clkdiv(&c, clkdiv);
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29
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30 // Load our configuration, and start the program from the beginning
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31 pio_sm_init(pio, sm, offset, &c);
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32 pio_sm_set_enabled(pio, sm, true);
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33 }
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34 %}
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