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83 lines
1.4 KiB
83 lines
1.4 KiB
#include <avr/io.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "sipo_pwm.h"
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#include "iopins.h"
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#include "sipo_pwm_config.h"
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/* -------- SIPO PWM MODULE ---------- */
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/** Buffer for sending bits to SIPO */
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bool _buff[SPWM_CHANNELS];
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uint8_t spwm_levels[SPWM_CHANNELS];
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/** Send _buff to SIPO */
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void _send_buffer()
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{
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for (int8_t i = SPWM_CHANNELS - 1; i >= 0; i--)
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{
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#if (SPWM_INVERT)
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set_pin(SPWM_DATA, !_buff[i]); /* Common anode */
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#else
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set_pin(SPWM_DATA, _buff[i]); /* Common cathode */
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#endif
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// send a CLK pulse
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pin_high(SPWM_CLK);
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pin_low(SPWM_CLK);
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}
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// send a STR pulse
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pin_high(SPWM_STR);
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pin_low(SPWM_STR);
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}
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void spwm_init()
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{
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// Pin directions
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as_output(SPWM_CLK);
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as_output(SPWM_STR);
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as_output(SPWM_DATA);
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// Initial states
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pin_low(SPWM_CLK);
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pin_low(SPWM_STR);
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}
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/**
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* Display PWM channels.
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* This could be called in a Timer ISR.
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*/
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void spwm_send()
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{
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// Set all bits to 1 (if their PWM level is 0, set to 0)
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for (uint8_t bit = 0; bit < SPWM_CHANNELS; bit++)
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{
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_buff[bit] = (bool) spwm_levels[bit];
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}
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// Show initial state
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_send_buffer();
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// For each PWM level...
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for (uint16_t pwm = 0; pwm < SPWM_COLOR_DEPTH; pwm++)
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{
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// Turn OFF bits that are below the level
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for (uint8_t bit = 0; bit < SPWM_CHANNELS; bit++)
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{
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if (spwm_levels[bit] < pwm)
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{
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_buff[bit] = 0;
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}
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}
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// And show...
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_send_buffer();
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}
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}
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