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/* |
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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){ |
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apa102_setleds_pin(ledarray,leds, _BV(RGB_DI_PIN & 0xF), _BV(RGB_CLK_PIN & 0xF)); |
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} |
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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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pinMode(RGB_DI_PIN, PinDirectionOutput); |
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pinMode(RGB_CLK_PIN, PinDirectionOutput); |
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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(){ |
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apa102_send_frame(0); |
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} |
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void apa102_end_frame(uint16_t leds) |
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{ |
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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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digitalWrite(RGB_DI_PIN, !!(byte & (1 << (7-i))); |
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digitalWrite(RGB_CLK_PIN, PinLevelHigh); |
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} |
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} |