porklib: Simple library for programming Arduino in C
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avr-lib/examples/sipo_pwm_74xx4094_595/sipo_pwm_config.h

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/* Config for SIPO PWM */
// --- PWM pin aliases ---
// Store signal
#define SPWM_STR D2
// Shift/clock signal
#define SPWM_CLK D3
// Data signal
#define SPWM_DATA D4
// --- Other settings ---
// Number of PWM levels (color depth)
#define SPWM_COLOR_DEPTH 256
// Number of SIPO channels
#define SPWM_CHANNELS 24
// Invert outputs (for Common Anode LEDs)
#define SPWM_INVERT 1