WS2812_Demo.cpp

Continuously cycle an RGB LED between bright and dim white

cmake_minimum_required(VERSION 3.12)
find_package(PropWare REQUIRED)
 
project(WS2812_Demo)
 
create_simple_executable(${PROJECT_NAME} WS2812_Demo.cpp)

 
#include <PropWare/hmi/output/ws2812.h>
 
using PropWare::Pin;
using PropWare::WS2812;
 
static const Pin::Mask    LED_TX_PIN_MASK = Pin::Mask::P0;
static const WS2812::Type LED_TYPE        = WS2812::Type::GRB;
static const unsigned int           MAX_BRIGHTNESS  = 0x0C0C0C;
 
int main() {
    const WS2812 led(LED_TX_PIN_MASK, LED_TYPE);
 
    const int delay = 40 * MILLISECOND;
    while (1) {
        unsigned int i;
 
        // Go bright
        for (i = 0; i < MAX_BRIGHTNESS; i += 0x010101) {
            led.send(i);
            waitcnt(delay + CNT);
        }
 
        // Go dim
        for (; i; i -= 0x010101) {
            led.send(i);
            waitcnt(delay + CNT);
        }
    }
}