;
; Copyright (c) 2025 Daniel O'Connor
;

.program trigger
.define TRIGGER_IRQ 0

.wrap_target
; Wait for trigger to be low
    wait 0 pin 0
; Wait for rising edge
    wait 1 pin 0
; Signal other state machine
    irq nowait TRIGGER_IRQ
.wrap

% c-sdk {
static inline void trigger_program_init(PIO pio, uint sm, uint offset, uint pin, uint clkdiv) {
    pio_sm_config c = trigger_program_get_default_config(offset);

    // Configure SM input pin mapping to point to trigger pin
    sm_config_set_in_pins(&c, pin);
    // Set to input
    pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, false);
    // Connect this GPIO to this PIO block
    pio_gpio_init(pio, pin);

    sm_config_set_clkdiv(&c, clkdiv);

    // Load our configuration, and start the program from the beginning
    pio_sm_init(pio, sm, offset, &c);
    pio_sm_set_enabled(pio, sm, true);
}
%}