37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
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void send_byte(io_pin_t data_pin, io_pin_t clock_pin, uint8_t byte) {
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for (int i = 7; i >= 0; i--) {
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if (byte & _BV(i)) {
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(*data_pin.port) |= _BV(data_pin.pin);
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} else {
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(*data_pin.port) &= ~(_BV(data_pin.pin));
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}
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(*clock_pin.port) |= _BV(clock_pin.pin);
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(*clock_pin.port) &= ~(_BV(clock_pin.pin));
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}
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}
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void send_start(io_pin_t data_pin, io_pin_t clock_pin) {
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send_byte(data_pin, clock_pin, 0);
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send_byte(data_pin, clock_pin, 0);
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send_byte(data_pin, clock_pin, 0);
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send_byte(data_pin, clock_pin, 0);
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}
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void send_term(io_pin_t data_pin, io_pin_t clock_pin) {
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send_byte(data_pin, clock_pin, 0xff);
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send_byte(data_pin, clock_pin, 0xff);
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send_byte(data_pin, clock_pin, 0xff);
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send_byte(data_pin, clock_pin, 0xff);
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}
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void send_pixels(io_pin_t data_pin, io_pin_t clock_pin, rgb_t * pixels, uint8_t count) {
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send_start(data_pin, clock_pin);
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for (uint8_t i = 0; i < count; i++) {
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send_byte(data_pin, clock_pin, 0xe0 + pixels[i].brightness);
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send_byte(data_pin, clock_pin, pixels[i].r);
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send_byte(data_pin, clock_pin, pixels[i].b);
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send_byte(data_pin, clock_pin, pixels[i].g);
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}
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send_term(data_pin, clock_pin);
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}
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