96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/*
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* APA102 lib V1.0a
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*
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* Controls APA102 RGB-LEDs
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* Author: Mikkel (Duckle29 on github)
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*
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* Dec 22th, 2017 v1.0a Initial Version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "apa102.h"
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "debug.h"
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// Setleds for standard RGB
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void inline apa102_setleds(LED_TYPE *ledarray, uint16_t leds) { apa102_setleds_pin(ledarray, leds, _BV(RGB_DI_PIN & 0xF), _BV(RGB_CLK_PIN & 0xF)); }
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void static inline apa102_setleds_pin(LED_TYPE *ledarray, uint16_t leds, uint8_t pinmask_DI, uint8_t pinmask_CLK) {
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setPinOutput(RGB_DI_PIN);
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setPinOutput(RGB_CLK_PIN);
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apa102_send_array((uint8_t *)ledarray, leds)
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}
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void apa102_send_array(uint8_t *data, uint16_t leds) { // Data is struct of 3 bytes. RGB - leds is number of leds in data
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apa102_start_frame();
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while (leds--) {
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apa102_send_frame(0xFF000000 | (data->b << 16) | (data->g << 8) | data->r);
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data++;
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}
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apa102_end_frame(leds);
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}
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void apa102_send_frame(uint32_t frame) {
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for (uint32_t i = 0xFF; i > 0;) {
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apa102_send_byte(frame & i);
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i = i << 8;
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}
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}
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void apa102_start_frame() { apa102_send_frame(0); }
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void apa102_end_frame(uint16_t leds) {
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// This function has been taken from: https://github.com/pololu/apa102-arduino/blob/master/APA102.h
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// and adapted. The code is MIT licensed. I think thats compatible?
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// We need to send some more bytes to ensure that all the LEDs in the
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// chain see their new color and start displaying it.
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//
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// The data stream seen by the last LED in the chain will be delayed by
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// (count - 1) clock edges, because each LED before it inverts the clock
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// line and delays the data by one clock edge. Therefore, to make sure
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// the last LED actually receives the data we wrote, the number of extra
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// edges we send at the end of the frame must be at least (count - 1).
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// For the APA102C, that is sufficient.
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//
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// The SK9822 only updates after it sees 32 zero bits followed by one more
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// rising edge. To avoid having the update time depend on the color of
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// the last LED, we send a dummy 0xFF byte. (Unfortunately, this means
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// that partial updates of the beginning of an LED strip are not possible;
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// the LED after the last one you are trying to update will be black.)
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// After that, to ensure that the last LED in the chain sees 32 zero bits
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// and a rising edge, we need to send at least 65 + (count - 1) edges. It
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// is sufficent and simpler to just send (5 + count/16) bytes of zeros.
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//
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// We are ignoring the specification for the end frame in the APA102/SK9822
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// datasheets because it does not actually ensure that all the LEDs will
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// start displaying their new colors right away.
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apa102_send_byte(0xFF);
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for (uint16_t i = 0; i < 5 + leds / 16; i++) {
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apa102_send_byte(0);
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}
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}
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void apa102_send_byte(uint8_t byte) {
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uint8_t i;
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for (i = 0; i < 8; i++) {
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writePin(RGB_DI_PIN, !!(byte & (1 << (7 - i))));
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writePinHigh(RGB_CLK_PIN);
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}
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}
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