int main(void)
{
boardConfig();
tickConfig( 1, 0 );
digitalConfig( 0, ENABLE_DIGITAL_IO );
uint8_t dutyCycle = 0; /* 0 a 255 */
analogConfig( ENABLE_ANALOG_INPUTS );
pwmConfig( 0, PWM_TIMERS_ENABLE );
pwmConfig( PWM0, PWM_OUTPUT_ENABLE );
pwmConfig( PWM7, PWM_OUTPUT_ENABLE );
pwmWrite( PWM7, 0 );
pwmWrite( PWM0, 0 );
while(1) {
dutyCycle = analogRead(AI1) / 4 ;
pwmWrite( PWM7, dutyCycle );
pwmWrite( PWM0, dutyCycle );
}
return 0 ;
}
/* normally the tone frequency should be 31 to 4978, refer to piches.h */
void tone(uint8_t pin, uint16_t frequency, unsigned long duration)
{
static struct rt_timer timer2, timer3;
rt_timer_t timer;
RT_ASSERT(frequency * 2 < UINT16_MAX);
if(pin < 2 || pin > 3)
return;
if (pin == 2)
{
timer = &timer2;
}
else if (pin == 3)
{
timer = &timer3;
}
rt_timer_stop(timer);
rt_timer_init(timer, "pwmkill",
pwm_shutdown, (void*) pin,
rt_tick_from_millisecond(duration),
RT_TIMER_FLAG_ONE_SHOT);
TIM_config(pin, frequency);
pwmConfig(pin, UINT8_MAX / 2);
rt_timer_start(timer);
}
void analogWrite(uint8_t pin, uint8_t value)
{
// We need to make sure the PWM output is enabled for those pins
// that support it, as we turn it off when digitally reading or
// writing with them. Also, make sure the pin is in output mode
// for consistenty with Wiring, which doesn't require a pinMode
// call for the analog output pins.
if(value == 0)
{
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
}
else if(value == 255)
{
pinMode(pin, OUTPUT);
digitalWrite(pin, HIGH);
}
else
{
pwmConfig(pin, value);
}
}
