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| -rwxr-xr-x | drivers/avr/apa102.c | 101 | ||||
| -rwxr-xr-x | drivers/avr/apa102.h | 46 |
2 files changed, 147 insertions, 0 deletions
diff --git a/drivers/avr/apa102.c b/drivers/avr/apa102.c new file mode 100755 index 000000000..55a0d5777 --- /dev/null +++ b/drivers/avr/apa102.c @@ -0,0 +1,101 @@ +/* +* APA102 lib V1.0a +* +* Controls APA102 RGB-LEDs +* Author: Mikkel (Duckle29 on github) +* +* Dec 22th, 2017 v1.0a Initial Version +* +* This program is free software: you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation, either version 2 of the License, or +* (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "apa102.h" +#include <avr/interrupt.h> +#include <avr/io.h> +#include <util/delay.h> +#include "debug.h" + +// Setleds for standard RGB +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)); +} + +void static inline apa102_setleds_pin(LED_TYPE *ledarray, uint16_t leds, uint8_t pinmask_DI, uint8_t pinmask_CLK){ + pinMode(RGB_DI_PIN, PinDirectionOutput); + pinMode(RGB_CLK_PIN, PinDirectionOutput); + + apa102_send_array((uint8_t*)ledarray,leds) +} + +void apa102_send_array(uint8_t *data, uint16_t leds){ // Data is struct of 3 bytes. RGB - leds is number of leds in data + apa102_start_frame(); + while(leds--){ + apa102_send_frame(0xFF000000 | (data->b << 16) | (data->g << 8) | data->r); + data++; + } + apa102_end_frame(leds); +} + +void apa102_send_frame(uint32_t frame){ + for(uint32_t i=0xFF; i>0;){ + apa102_send_byte(frame & i); + i = i << 8; + } +} + +void apa102_start_frame(){ + apa102_send_frame(0); +} + +void apa102_end_frame(uint16_t leds) +{ + // This function has been taken from: https://github.com/pololu/apa102-arduino/blob/master/APA102.h + // and adapted. The code is MIT licensed. I think thats compatible? + + // We need to send some more bytes to ensure that all the LEDs in the + // chain see their new color and start displaying it. + // + // The data stream seen by the last LED in the chain will be delayed by + // (count - 1) clock edges, because each LED before it inverts the clock + // line and delays the data by one clock edge. Therefore, to make sure + // the last LED actually receives the data we wrote, the number of extra + // edges we send at the end of the frame must be at least (count - 1). + // For the APA102C, that is sufficient. + // + // The SK9822 only updates after it sees 32 zero bits followed by one more + // rising edge. To avoid having the update time depend on the color of + // the last LED, we send a dummy 0xFF byte. (Unfortunately, this means + // that partial updates of the beginning of an LED strip are not possible; + // the LED after the last one you are trying to update will be black.) + // After that, to ensure that the last LED in the chain sees 32 zero bits + // and a rising edge, we need to send at least 65 + (count - 1) edges. It + // is sufficent and simpler to just send (5 + count/16) bytes of zeros. + // + // We are ignoring the specification for the end frame in the APA102/SK9822 + // datasheets because it does not actually ensure that all the LEDs will + // start displaying their new colors right away. + + apa102_send_byte(0xFF); + for (uint16_t i = 0; i < 5 + leds / 16; i++){ + apa102_send_byte(0); + } +} + +void apa102_send_byte(uint8_t byte){ + uint8_t i; + for (i = 0; i < 8; i++){ + digitalWrite(RGB_DI_PIN, !!(byte & (1 << (7-i))); + digitalWrite(RGB_CLK_PIN, PinLevelHigh); + } +} diff --git a/drivers/avr/apa102.h b/drivers/avr/apa102.h new file mode 100755 index 000000000..e7d7c3684 --- /dev/null +++ b/drivers/avr/apa102.h @@ -0,0 +1,46 @@ +/* + * light weight WS2812 lib include + * + * Version 2.3 - Nev 29th 2015 + * Author: Tim (cpldcpu@gmail.com) + * + * Please do not change this file! All configuration is handled in "ws2812_config.h" + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#pragma once + +#include <avr/io.h> +#include <avr/interrupt.h> + +#include "rgblight_types.h" + + +/* User Interface + * + * Input: + * ledarray: An array of GRB data describing the LED colors + * number_of_leds: The number of LEDs to write + * pinmask (optional): Bitmask describing the output bin. e.g. _BV(PB0) + * + * The functions will perform the following actions: + * - Set the data-out pin as output + * - Send out the LED data + * - Wait 50�s to reset the LEDs + */ + +void apa102_setleds (LED_TYPE *ledarray, uint16_t number_of_leds); +void apa102_setleds_pin (LED_TYPE *ledarray, uint16_t number_of_leds,uint8_t pinmask); +void apa102_setleds_rgbw(LED_TYPE *ledarray, uint16_t number_of_leds); |