353 lines
12 KiB
C
353 lines
12 KiB
C
/* 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 3 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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*/
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/** @file main.c
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@author King Kévin <kingkevin@cuvoodoo.info>
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@date 2016
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@brief show the time on a LED strip
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The LED strip consists of 60 WS2812b LEDs.
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The time is read from a DS1307 RTC module.
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdio.h> // standard I/O facilities
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#include <stdlib.h> // standard utilities
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#include <unistd.h> // standard streams
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#include <errno.h> // error number utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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#include <libopencm3/cm3/nvic.h> // interrupt utilities
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#include <libopencm3/stm32/exti.h> // external interrupt utilities
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/* own libraries */
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#include "global.h" // board definitions
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#include "usart.h" // USART utilities
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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#include "led_ws2812b.h" // WS2812b LEDs utilities
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#include "rtc_ds1307.h" // Real Time Clock DS1307 utilities
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/** @defgroup main_flags flag set in interrupts to be processed in main task
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@{
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*/
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volatile bool button_flag = false; /**< flag set if board user button has been pressed */
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/** @} */
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/** the number of ticks in one second
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* @note the other values are derived from this value @ref main_ticks
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*/
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#define TICKS_PER_SECOND 255
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/** @defgroup main_ticks ticks per time units
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* @note I have to use type variables because defines would be stored in signed integers, leading to an overflow it later calculations
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* @{
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*/
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/** number of ticks in one second */
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const uint32_t ticks_second = TICKS_PER_SECOND;
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/** number of ticks in one minute */
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const uint32_t ticks_minute = 60*TICKS_PER_SECOND;
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/** number of ticks in one hour */
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const uint32_t ticks_hour = 60*60*TICKS_PER_SECOND;
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/** number of ticks in one midday (12 hours) */
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const uint32_t ticks_midday = 12*60*60*TICKS_PER_SECOND;
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/** @} */
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/** RGB values for the WS2812b clock LEDs */
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uint8_t clock_leds[WS2812B_LEDS*3] = {0};
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/** @brief default printf output */
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int _write(int file, char *ptr, int len)
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{
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int i;
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if (file == STDOUT_FILENO || file == STDERR_FILENO) {
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for (i = 0; i < len; i++) {
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if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
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usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
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cdcacm_putchar('\r'); // a second line feed doesn't break the display
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}
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usart_putchar_nonblocking(ptr[i]); // send byte over USART
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cdcacm_putchar(ptr[i]); // send byte over USB
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}
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return i;
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}
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errno = EIO;
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return -1;
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}
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/** @brief switch on board LED */
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void led_on(void)
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{
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#ifdef SYSTEM_BOARD
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gpio_clear(LED_PORT, LED_PIN);
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#elif MAPLE_MINI
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gpio_set(LED_PORT, LED_PIN);
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#endif
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}
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/** @brief switch off board LED */
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void led_off(void)
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{
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#ifdef SYSTEM_BOARD
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gpio_set(LED_PORT, LED_PIN);
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#elif MAPLE_MINI
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gpio_clear(LED_PORT, LED_PIN);
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#endif
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}
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/** @brief toggle board LED */
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void led_toggle(void)
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{
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gpio_toggle(LED_PORT, LED_PIN);
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}
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/* switch off all clock LEDs */
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static void clock_clear(void)
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{
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// set all colors of all LEDs to 0
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for (uint16_t i=0; i<LENGTH(clock_leds); i++) {
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clock_leds[i] = 0;
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}
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}
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/* set hours mark on clock LEDs */
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static void clock_hours(void)
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{
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for (uint8_t hour=0; hour<12; hour++) {
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uint16_t led = WS2812B_LEDS/12*hour;
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clock_leds[led*3+0] = 0xff;
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clock_leds[led*3+1] = 0xff;
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clock_leds[led*3+2] = 0xff;
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}
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}
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/* show time on LED clock
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* show hours and minutes progress as full arcs
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* show second position as marker
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* the brightness of the LED shows the progress of the unit
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* hours are blue, minutes green, seconds red */
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static void clock_show_time(uint32_t time)
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{
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uint32_t led_hour = (WS2812B_LEDS*(255*(uint64_t)(time%ticks_midday)))/ticks_midday; // scale to LED brightnesses for hours
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uint32_t led_minute = (WS2812B_LEDS*(255*(uint64_t)(time%ticks_hour)))/ticks_hour; // scale to LED brightnesses for minutes
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if (led_hour>=WS2812B_LEDS*255 || led_minute>=WS2812B_LEDS*255) { // a calculation error occurred
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return;
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}
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// show hours and minutes on LEDs
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if (led_hour>led_minute) {
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// show hours in blue (and clear other LEDs)
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for (uint16_t led=0; led<WS2812B_LEDS; led++) {
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clock_leds[led*3+0] = 0;
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clock_leds[led*3+1] = 0;
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if (led_hour>=0xff) { // full hours
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clock_leds[led*3+2] = 0xff;
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} else { // running hours
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clock_leds[led*3+2] = led_hour;
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}
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led_hour -= clock_leds[led*3+2];
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}
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// show minutes in green (override hours)
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for (uint16_t led=0; led<WS2812B_LEDS && led_minute>0; led++) {
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clock_leds[led*3+0] = 0;
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if (led_minute>=0xff) { // full minutes
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clock_leds[led*3+1] = 0xff;
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} else { // running minutes
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clock_leds[led*3+1] = led_minute;
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}
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led_minute -= clock_leds[led*3+1];
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clock_leds[led*3+2] = 0;
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}
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} else {
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// show minutes in green (and clear other LEDs)
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for (uint16_t led=0; led<WS2812B_LEDS; led++) {
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clock_leds[led*3+0] = 0;
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if (led_minute>=0xff) { // full minutes
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clock_leds[led*3+1] = 0xff;
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} else { // running minutes
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clock_leds[led*3+1] = led_minute;
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}
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led_minute -= clock_leds[led*3+1];
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clock_leds[led*3+2] = 0;
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}
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// show hours in blue (override minutes)
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for (uint16_t led=0; led<WS2812B_LEDS && led_hour>0; led++) {
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clock_leds[led*3+0] = 0;
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clock_leds[led*3+1] = 0;
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if (led_hour>=0xff) { // full hours
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clock_leds[led*3+2] = 0xff;
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} else { // running hours
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clock_leds[led*3+2] = led_hour;
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}
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led_hour -= clock_leds[led*3+2];
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}
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}
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// don't show seconds on full minute (better for first time setting, barely visible else)
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if (time%ticks_minute==0) {
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return;
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}
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uint16_t led_second = (WS2812B_LEDS*(time%ticks_minute))/ticks_minute; // get LED for seconds
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uint8_t brightness_second = (255*(time%ticks_second))/ticks_second; // get brightness for seconds
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// set second LED
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clock_leds[led_second*3+0] = brightness_second;
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clock_leds[led_second*3+1] = 0;
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clock_leds[led_second*3+2] = 0;
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// set previous LED
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clock_leds[((led_second-1)%WS2812B_LEDS)*3+0] = 0xff-brightness_second;
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clock_leds[((led_second-1)%WS2812B_LEDS)*3+1] = 0;
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clock_leds[((led_second-1)%WS2812B_LEDS)*3+2] = 0;
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}
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/* set the LEDs */
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static void leds_set(void)
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{
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for (uint16_t i=0; i<LENGTH(clock_leds)/3; i++) {
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ws2812b_set_rgb(i,clock_leds[i*3+0],clock_leds[i*3+1],clock_leds[i*3+2]);
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}
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}
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/** @brief program entry point
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* this is the firmware function started by the micro-controller
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*/
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int main(void)
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{
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SCB_VTOR = (uint32_t) 0x08002000; // relocate vector table because of the bootloader
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rcc_clock_setup_in_hse_8mhz_out_72mhz(); // use 8 MHz high speed external clock to generate 72 MHz internal clock
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usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (for printing)
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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// setup LED
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rcc_periph_clock_enable(LED_RCC); // enable clock for LED
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gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'
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led_off(); // switch off LED to indicate setup started
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// setup button
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#if defined(BUTTON_RCC) && defined(BUTTON_PORT) && defined(BUTTON_PIN) && defined(BUTTON_EXTI) && defined(BUTTON_IRQ)
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rcc_periph_clock_enable(BUTTON_RCC); // enable clock for button
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gpio_set_mode(BUTTON_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, BUTTON_PIN); // set button pin to input
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rcc_periph_clock_enable(RCC_AFIO); // enable alternate function clock for external interrupt
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exti_select_source(BUTTON_EXTI, BUTTON_PORT); // mask external interrupt of this pin only for this port
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exti_set_trigger(BUTTON_EXTI, EXTI_TRIGGER_BOTH); // trigger on both edge
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exti_enable_request(BUTTON_EXTI); // enable external interrupt
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nvic_enable_irq(BUTTON_IRQ); // enable interrupt
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#endif
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// setup WS2812b LEDs
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ws2812b_setup(); // setup WS2812b LEDs
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clock_hours(); // show hour markers
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clock_clear(); // clear all LEDs
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leds_set(); // set the colors of all LEDs
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ws2812b_transmit(); // transmit set color
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// setup RTC module
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rtc_setup(); // setup RTC module
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printf("welcome to the CuVoodoo LED clock\n"); // print welcome message
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led_on(); // switch on LED to indicate setup completed
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uint32_t time = 0; // the time to display
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uint32_t current_time = 6*ticks_hour+45*ticks_minute+15*ticks_second+ticks_second/4;
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printf("setting current time\n");
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while (time<current_time) {
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if (time+ticks_hour<=current_time) { // first set hours
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time += ticks_hour; // increment hours
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} else if (time+ticks_minute<=current_time) { // second set minutes
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time += ticks_minute; // increment minutes
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} else if (time+ticks_minute<=current_time) { // third set seconds
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time += ticks_second; // increment seconds
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} else { // finally set time
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time = current_time;
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}
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clock_show_time(time); // set time (progress)
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leds_set(); // set the colors of all LEDs
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ws2812b_transmit(); // transmit set color
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// delay some time
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for (uint32_t i=0; i<400000; i++) {
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__asm__("nop");
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}
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}
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printf("it is now %02lu:%02lu:%02lu\n", time/ticks_hour, (time%ticks_hour)/ticks_minute, (time%ticks_minute)/ticks_second);
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// test RTC
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uint16_t* rtc_time = rtc_read_time();
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printf("RTC full time %04d-%02d-%02d %02d:%02d:%02d\n", rtc_time[6], rtc_time[5], rtc_time[4], rtc_time[2], rtc_time[1], rtc_time[0]);
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printf("RTC oscillator: ");
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if (rtc_oscillator_disabled()) {
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printf("disbaled\n");
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} else {
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printf("enabled\n");
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}
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//rtc_write_time(0,52,9,4,23,3,2016);
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//rtc_oscillator_enable();
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printf("input commands\n");
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bool action = false; // if an action has been performed don't go to sleep
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button_flag = false; // reset button flag
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char c; // to store received character
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bool char_flag = false; // a new character has been received
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/* toggle the LED with every transmitted character */
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while (true) { // infinite loop
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while (usart_received) { // echo every received character
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action = true; // action has been performed
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led_toggle(); // toggle LED
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c = usart_getchar(); // store receive character
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char_flag = true; // notify character has been received
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}
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while (cdcacm_received) { // echo every received character
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action = true; // action has been performed
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led_toggle(); // toggle LED
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c = usart_getchar(); // store receive character
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char_flag = true; // notify character has been received
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}
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while (char_flag) {
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char_flag = false; // reset flag
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action = true; // action has been performed
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printf("%c",c); // echo receive character
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printf("%02lu:%02lu\n", time/ticks_hour, (time%ticks_hour)/ticks_minute);
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clock_show_time(time); // set time
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time += ticks_minute; // increment time
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leds_set(); // set the colors of all LEDs
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ws2812b_transmit(); // transmit set color
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}
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while (button_flag) {
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button_flag = false; // reset flag
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action = true; // action has been performed
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led_toggle(); // toggle LED
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}
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// go to sleep if nothing had to be done, else recheck for activity
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if (action) {
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action = false;
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} else {
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__WFI(); // go to sleep
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}
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}
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return 0;
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}
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#if defined(BUTTON_ISR) && defined(BUTTON_EXTI)
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void BUTTON_ISR(void)
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{
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exti_reset_request(BUTTON_EXTI); // reset interrupt
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button_flag = true; // perform button action
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}
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#endif
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