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16
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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 ctrl
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6 .define TRIGGER_IRQ 0
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7 ; Assert all 0s
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8 mov pins, null
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9 ; Wait for start trigger and clear IRQ
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10 wait 1 irq TRIGGER_IRQ
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11 .wrap_target
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12 out pins 8
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13 nop
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14 out pins 8
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15 nop
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16 out pins 8
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17 nop
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18 out pins 8
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19 nop
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20 .wrap
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21
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22 % c-sdk {
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23 static inline void ctrl_program_init(PIO pio, uint sm, uint offset, uint pin, uint clkdiv) {
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24 pio_sm_config c = dac_program_get_default_config(offset);
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25
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26 // Set the OUT base pin to the provided `pin` parameter.
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27 // Note: We only need 6 pins but pull a byte at a time to make
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28 // generating the data simpler
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29 sm_config_set_out_pins(&c, pin, 6);
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30 // Set the pin directions to output at the PIO
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31 pio_sm_set_consecutive_pindirs(pio, sm, pin, 6, true);
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32 // Connect these GPIOs to this PIO block
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33 for (int i = 0; i < 6; i++)
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34 pio_gpio_init(pio, pin + i);
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35
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36 sm_config_set_out_shift(
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37 &c,
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38 true, // Shift-to-right
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39 true, // Autopull enabled
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40 32 // Autopull threshold (bits!)
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41 );
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42
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43 // We only send, so disable the RX FIFO to make the TX FIFO deeper.
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44 sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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45
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46 sm_config_set_clkdiv(&c, clkdiv);
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47
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48 // Load our configuration, and start the program from the beginning
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49 pio_sm_init(pio, sm, offset, &c);
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50 pio_sm_set_enabled(pio, sm, true);
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51 }
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52 %}
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