blink_array.c

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/*
 * Copyright (C) 2022  Patrick Pedersen
 
 * 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 3 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 <https://www.gnu.org/licenses/>.
 * 
 */
 
#include <stm8s.h>
 
#include <ws2812.h>
 
#define N_LEDS 8                
#define DATA_PORT_BASE GPIOD_BaseAddress    
#define DATA_PINS {GPIO_PIN_4}          
#define RESET_TIME 30               
#define COLOR_ORDER grb             
 
#define WAIT_LOOPS 1000000
 
uint8_t pins[] = DATA_PINS;
ws2812_rgb leds[N_LEDS]; 
ws2812 ws2812_dev;
 
void init_16mhz_clk()
{
    CLK_DeInit();
    CLK_HSICmd(ENABLE);
    CLK_HSECmd(DISABLE);
    CLK_LSICmd(DISABLE);
    CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV1);
    CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV1);
    CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE);
}
 
void main()
{
    // Initialize clock to run at 16Mhz
    init_16mhz_clk();
 
    // Initialize WS2812 device struct
 
        ws2812_cfg cfg;
 
        cfg.pins            = pins;
        cfg.rst_time_us         = RESET_TIME;
        cfg.order           = COLOR_ORDER;
        cfg.n_dev           = sizeof(pins);
    cfg.port_baseaddr       = DATA_PORT_BASE;
 
    ws2812_config(&ws2812_dev, &cfg);
    
    // Blink strip
 
    while(1) {
        // Fill strip array with red
        for (unsigned int i = 0; i < N_LEDS; i++) {
            leds[i].r = 255;
            leds[i].g = 0;
            leds[i].b = 0;              
        }
 
        // Write to strip
        ws2812_prep_tx(&ws2812_dev);
        ws2812_tx(&ws2812_dev, leds, N_LEDS);
        ws2812_close_tx(&ws2812_dev);
 
        // Wait for some time
        for (unsigned long i = 0; i < WAIT_LOOPS; i++) {
            __asm__("nop");
        }
 
        // Fill strip array with black
        for (unsigned int i = 0; i < N_LEDS; i++) {
            leds[i].r = 0;
            leds[i].g = 0;
            leds[i].b = 0;              
        }
 
        // Wait for some time
        for (unsigned long i = 0; i < WAIT_LOOPS; i++) {
            __asm__("nop");
        }
    }
}
 
// See: https://community.st.com/s/question/0D50X00009XkhigSAB/what-is-the-purpose-of-define-usefullassert
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{ 
    while (TRUE)
    {
    }
}
#endif