237 lines
4.8 KiB
C
237 lines
4.8 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2011 Piotr Esden-Tempski <piotr@esden.net>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* This example is implementing the protocol of ZJ168 addressable LED
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* strips. These strips use the LPD6803 controller. You may be able to
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* find the datasheet here:
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* http://www.adafruit.com/datasheets/LPD6803.pdf
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*/
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#include <stdlib.h>
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#include <libopencm3/stm32/f1/rcc.h>
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#include <libopencm3/stm32/f1/gpio.h>
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#define SPI_BANK GPIOB
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#define SCLK_PIN GPIO13
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#define MOSI_PIN GPIO15
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#define SMALL_DELAY_VALUE 0
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#define COLOR_COUNT 50
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#define SCLK(VAL) \
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if (VAL) { \
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gpio_set(SPI_BANK, SCLK_PIN); \
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} else { \
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gpio_clear(SPI_BANK, SCLK_PIN); \
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}
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#define MOSI(VAL) \
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if (VAL) { \
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gpio_set(SPI_BANK, MOSI_PIN); \
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} else { \
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gpio_clear(SPI_BANK, MOSI_PIN); \
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}
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#define SMALL_DELAY() { \
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int j; \
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for (j = 0; j < SMALL_DELAY_VALUE; j++) \
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__asm__("nop"); \
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}
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struct color {
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u8 r;
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u8 g;
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u8 b;
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};
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/* Set STM32 to 72 MHz. */
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void clock_setup(void)
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{
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rcc_clock_setup_in_hse_8mhz_out_72mhz();
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/* Enable GPIOB and GPIOC clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
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}
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void gpio_setup(void)
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{
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/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
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/* Set GPIO13 (in GPIO port B) to 'output push-pull'. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
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/* Set GPIO15 (in GPIO port B) to 'output push-pull'. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
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}
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void send_colors(struct color *colors, int count)
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{
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int i, k;
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/* Initialize SPI pins. */
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SCLK(0);
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MOSI(0);
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/* Start frame */
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for (i = 0; i < 32; i++) {
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SCLK(1);
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SMALL_DELAY();
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SCLK(0);
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SMALL_DELAY();
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}
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/* Color cell output */
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for (k = 0; k < count; k++) {
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/* Start bit */
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MOSI(1);
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SCLK(1);
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SMALL_DELAY();
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SCLK(0);
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SMALL_DELAY();
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/* Blue */
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for (i = 0; i < 5; i++) {
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MOSI(((colors[k].b & ((1 << 4) >> i)) != 0));
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SCLK(1);
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SMALL_DELAY();
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SCLK(0);
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SMALL_DELAY();
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}
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/* Red */
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for (i = 0; i < 5; i++) {
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MOSI(((colors[k].r & ((1 << 4) >> i)) != 0));
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SCLK(1);
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SMALL_DELAY();
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SCLK(0);
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SMALL_DELAY();
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}
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/* Green */
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for (i = 0; i < 5; i++) {
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MOSI(((colors[k].g & ((1 << 4) >> i)) != 0));
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SCLK(1);
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SMALL_DELAY();
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SCLK(0);
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SMALL_DELAY();
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}
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}
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/* End frame */
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MOSI(0);
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for (k = 0; k < count; k++) {
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SCLK(1);
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SMALL_DELAY();
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SCLK(0);
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SMALL_DELAY();
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}
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}
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void reset_colors(struct color *colors, int count)
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{
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int i;
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for (i = 0; i < count; i++) {
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colors[i].r = 0;
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colors[i].g = 0;
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colors[i].b = 0;
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}
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}
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void init_colors(struct color *colors, int count)
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{
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colors[0].r = 0x1F;
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colors[0].g = 0;
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colors[0].b = 0;
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colors[1].r = 0;
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colors[1].g = 0x1F;
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colors[1].b = 0;
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colors[2].r = 0;
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colors[2].g = 0;
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colors[2].b = 0x1F;
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count = count;
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}
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void step_colors(struct color *colors, int count)
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{
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int i;
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struct color tmp_color1;
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struct color tmp_color2;
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#if 0
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/* Random blinking. */
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for (i = 0; i < count; i++) {
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colors[i].r = rand() & 0x01;
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colors[i].g = rand() & 0x01;
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colors[i].b = rand() & 0x01;
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}
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#endif
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/* Generate next colors. */
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tmp_color1.r = colors[0].r;
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tmp_color1.g = colors[0].g;
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tmp_color1.b = colors[0].b;
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colors[0].r = colors[count - 1].r;
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colors[0].g = colors[count - 1].g;
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colors[0].b = colors[count - 1].b;
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for (i = 1; i < count; i++) {
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tmp_color2.r = colors[i].r;
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tmp_color2.g = colors[i].g;
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tmp_color2.b = colors[i].b;
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colors[i].r = tmp_color1.r;
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colors[i].g = tmp_color1.g;
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colors[i].b = tmp_color1.b;
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tmp_color1.r = tmp_color2.r;
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tmp_color1.g = tmp_color2.g;
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tmp_color1.b = tmp_color2.b;
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}
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}
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int main(void)
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{
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int i;
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struct color colors[COLOR_COUNT];
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clock_setup();
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gpio_setup();
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reset_colors(colors, COLOR_COUNT);
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init_colors(colors, COLOR_COUNT);
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while (1) {
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gpio_toggle(GPIOC, GPIO12); /* LED on/off */
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send_colors(colors, COLOR_COUNT);
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step_colors(colors, COLOR_COUNT);
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for (i = 0; i < 1000000; i++) /* Wait a bit. */
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__asm__("nop");
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}
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return 0;
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}
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