147 lines
4.3 KiB
C
147 lines
4.3 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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#include <stdint.h> // Standard Integer Types
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#include <stdio.h> // Standard IO facilities
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#include <stdlib.h> // General utilities
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#include <stdbool.h> // Boolean
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#include <string.h> // Strings
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#include <avr/io.h> // AVR device-specific IO definitions
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#include <util/delay.h> // Convenience functions for busy-wait delay loops
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#include <avr/interrupt.h> // Interrupts
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#include <avr/wdt.h> // Watchdog timer handling
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#include <avr/pgmspace.h> // Program Space Utilities
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#include <avr/sleep.h> // Power Management and Sleep Modes
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#include "main.h" // main definitions
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#include "uart.h" // basic UART functions
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#include "ws2812b.h" // to control WS2812B LEDs
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/* global variables */
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volatile uint8_t uart_in[4]; // input from USART, enough space for RGB values
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volatile uint8_t uart_in_i = 0; // UART input index
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const uint8_t channels[] = {11,8,11,11,8,11}; // the number of LEDs for each channel
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/* flags, set in the interrupts and handled in the main program */
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volatile bool uart_flag = false; // data on UART has been received
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/* switch off LED */
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void led_off(void)
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{
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LED_PORT &= ~(1<<LED_IO); // remove power to LED
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}
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/* switch on LED */
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void led_on(void)
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{
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LED_PORT |= (1<<LED_IO); // provide power to LED
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}
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/* toggle LED */
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void led_toggle(void)
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{
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LED_PIN |= (1<<LED_IO);
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}
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/* disable watchdog when booting */
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void wdt_init(void) __attribute__((naked)) __attribute__((section(".init3")));
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void wdt_init(void)
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{
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MCUSR = 0;
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wdt_disable();
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return;
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}
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/* receive UART input */
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ISR(USART_RX_vect) { /* UART receive interrupt */
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if (uart_in_i<sizeof(uart_in)) {
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uart_in[uart_in_i] = getchar(); // save current character
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uart_in_i++; // got to next one
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uart_flag = true; // warm main programm
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}
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}
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/* initialize GPIO */
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void io_init(void)
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{
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/* use UART as terminal */
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uart_init();
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stdout = &uart_output;
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stdin = &uart_input;
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/* gpio */
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/* LED */
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LED_DDR |= (1<<LED_IO); // LED is driven by pin (set as output)
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led_off();
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sei(); /* enable interrupts */
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/* WS2812B LEDs */
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ws2812b_init();
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ws2812b_off();
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ws2812b_show();
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}
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int main(void)
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{
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bool header = false; // has the atmolight message header been received
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uint8_t channel = 0; // the current channel
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uint8_t channel_led = 0; // the current LED on the current channel
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io_init(); // initialize IOs
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led_on();
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printf(PSTR("welcome to the CuVoodoo ScreenLight\n"));
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led_off();
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while (true) { // endless loop for micro-controller
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while (uart_flag) {
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uart_flag = false;
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if (!header) { // wait until atmolight header
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if (((uart_in_i==1) && !(uart_in[0]==0xff)) ||
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((uart_in_i==2) && !(uart_in[1]==0x00)) ||
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((uart_in_i==3) && !(uart_in[2]==0x00)) ||
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((uart_in_i==4) && !(uart_in[3]==3*60))) { // verify atmolight header
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led_on(); // indicate something is wrong
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uart_in_i = 0; // reset if start sequence is not detected
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} else if (uart_in_i==4) { // atmolight header received
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led_off(); // remove error indication
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header = true; // remember header has been received
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uart_in_i = 0; // reset to get values
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}
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} else { // receiving color values
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if (uart_in_i>=3) { // RGB color values received
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ws2812b_set_led_color(channel,channel_led,uart_in[0],uart_in[1],uart_in[2]); // set LED color
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channel_led++; // go the next LED
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if (channel_led>=channels[channel]) { // all LEDs of channel have been set
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channel++; // got to next channel
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channel_led = 0; // restart from first LED
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}
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if (channel>=sizeof(channels)) { // all LEDs have been set
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channel = 0; // restart from first channel
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header = false; // wait for header
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ws2812b_show(); // show the new colors
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}
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uart_in_i = 0; // get next color
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}
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}
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}
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}
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return 0;
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}
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