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/*********************************************************************
This is an example for our Feather Bluefruit modules
Pick one up today in the adafruit shop!
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
MIT license, check LICENSE for more information
All text above, and the splash screen below must be included in
any redistribution
*********************************************************************/
/*
* This sketch use different Hardware PWMs for LED Blue and Red
* running with different frequency
* - PWM0 : clock/1 ~ 16Mhz
* - PWM1 : clock/16 ~ 1Mhz
*
* While LED RED looks solid, LED BLUE will blink while fading
* (due to its lower freq). Furthermore LED RED is inverted
* compared to LED BLUE (PWM2) --> They fade in opposite direction.
*/
#include <Arduino.h>
/**************************************************************************/
/*!
@brief The setup function runs once when reset the board
*/
/**************************************************************************/
void setup()
{
// Add LED RED to PWM0
HwPWM0.addPin( LED_RED );
// Add LED BLUE to PWM1
HwPWM1.addPin( LED_BLUE );
// Enable PWM modules with 15-bit resolutions(max) but different clock div
HwPWM0.begin();
HwPWM0.setResolution(15);
HwPWM0.setClockDiv(PWM_PRESCALER_PRESCALER_DIV_1); // freq = 16Mhz
HwPWM1.begin();
HwPWM1.setResolution(15);
HwPWM1.setClockDiv(PWM_PRESCALER_PRESCALER_DIV_16); // freq = 1Mhz
}
/**************************************************************************/
/*!
@brief The loop function runs over and over again forever
*/
/**************************************************************************/
void loop()
{
const int maxValue = bit(15) - 1;
// fade in from min to max
for (int fadeValue = 0 ; fadeValue <= maxValue; fadeValue += 1024)
{
// Write same value but inverted for Led Blue
HwPWM0.writePin(LED_RED, fadeValue, false);
HwPWM1.writePin(LED_BLUE, fadeValue, true);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
// fade out from max to min
for (int fadeValue = maxValue ; fadeValue >= 0; fadeValue -= 1024)
{
// Write same value but inverted for Led Blue
HwPWM0.writePin(LED_RED, fadeValue, false);
HwPWM1.writePin(LED_BLUE, fadeValue, true);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
}
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