37 lines
1.1 KiB
Text
37 lines
1.1 KiB
Text
.program matrix
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; INPUT: repeated bit pattern
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; 0000_0100_0000_1000_0001_0000_0010_0000_0100_0000_1000_0001_0000_0000_0000_0000
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; So, like: 0x0408_1020, 0x4081_0000
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set x, 7
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loop:
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pull ifempty [31]
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; Assert the column pins
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out pins, 8 [31]
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; Read the row pins
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in pins, 5 [31]
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jmp x--, loop [31]
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; Output the two missing bits and push
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in null, 2 [31]
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push [31]
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% c-sdk {
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static inline void matrix_program_init(PIO pio, uint sm, uint offset, uint pin) {
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pio_sm_config c = matrix_program_get_default_config(offset);
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// The row inputs start at the pin base
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sm_config_set_in_pins(&c, pin);
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// The 6 output bits come after the 5 input bits
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sm_config_set_out_pins(&c, pin + 5, 6);
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// Set up the pins for PIO
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for(int i = 0; i < 11; i++)
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pio_gpio_init(pio, pin + i);
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// Set the pin directions
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 5, false);
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pio_sm_set_consecutive_pindirs(pio, sm, pin + 5, 6, true);
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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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%}
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