DualPWM_Demo.cpp

Drive two PWM waves on GPIO pins with varying duty cycles. Duty will vary from 0% up to 100% in 12.5% increments.

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

 
#include <PropWare/gpio/dualpwm.h>
 
using PropWare::DualPWM;
using PropWare::Runnable;
using PropWare::Port;
 
static const unsigned int         PWM_FREQUENCY = 20000;
static const PropWare::Port::Mask MASK_1        = Port::P0;
static const PropWare::Port::Mask MASK_2        = Port::P1;
 
int main () {
    static uint32_t       stack[48];
    volatile unsigned int leftDuty;
    volatile unsigned int rightDuty;
 
    const DualPWM pwmController(PWM_FREQUENCY, MASK_1, MASK_2, &leftDuty, &rightDuty, stack);
    Runnable::invoke(pwmController);
 
    while (1) {
        for (unsigned int i = 0; i <= DualPWM::MAX_DUTY; i += DualPWM::MAX_DUTY / 8) {
            leftDuty  = i;
            rightDuty = DualPWM::MAX_DUTY - i;
            waitcnt(CNT + MILLISECOND);
        }
    }
}