40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
.program TIMING
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.side_set 1 opt
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offStart:
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wait 0 irq 0 side 0 ; Wait for clock rising edge
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mov y, isr ; Wait time stored in ISR, Y register used as counter
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waitloop:
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jmp !y onStart ; When the timer runs out turn on the output pin and begin on time loop
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jmp y-- waitloop ; If the off time hasn't elapsed, keep looping
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onStart:
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mov y, osr side 1 ; On time stored in OSR, Y register used as a counter
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onloop:
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jmp !y offStart ; When the timer runs out turn off the output pin and wait for clock edge
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jmp y-- onloop ; If the on time hasn't yet elapsed, keep looping
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% c-sdk {
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static inline void TIMING_program_init(PIO pio, uint sm, uint offset, uint pin) {
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pio_sm_config c = TIMING_program_get_default_config(offset);
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// Map the state machine's OUT pin group to one pin, namely the `pin`
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// parameter to this function.
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sm_config_set_out_pins(&c, pin, 1);
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// Set this pin's GPIO function (connect PIO to the pad)
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pio_gpio_init(pio, pin);
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// Set the pin direction to output at the PIO
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
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sm_config_set_sideset_pins(&c, pin);
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// Load our configuration, and jump to the start of the program
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pio_sm_init(pio, sm, offset, &c);
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// Set the state machine running
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//pio_sm_set_enabled(pio, sm, true);
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}
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%} |