Arduino Due libraries (official and 3rd party)

Hardware Arduino Due
73

randomvibe:
Library: pwm01.h
Description: A clean alternate approach for setting up unique PWM frequencies from within a sketch, for any or all PWM pins. The trick is to utilize the two PWM clocks (CLKA & CLKB) provided by the SAM3X8E chip.

I wrote and enclosed a library (pwm01.h). It includes 4 user functions to: 1) setup PWM resolution, 2) setup PWM pin, frequency & pick clock, 3) write duty cycle, and 4) stop PWM. See example code for usage:

#include "C:\Programs\arduino-1.5.1r2\hardware\arduino\sam\libraries\Pwm01\pwm01.h"

void setup()
{
   uint32_t  pwm_duty = 32767;
   uint32_t  pwm_freq1 = 2;  
   uint32_t  pwm_freq2 = 5000;

// Set PWM Resolution
   pwm_set_resolution(16);

// Setup PWM Once (Up to two unique frequencies allowed
   //-----------------------------------------------------    
   pwm_setup( 6, pwm_freq1, 1);  // Pin 6 freq set to "pwm_freq1" on clock A
   pwm_setup( 7, pwm_freq2, 2);  // Pin 7 freq set to "pwm_freq2" on clock B
   pwm_setup( 8, pwm_freq2, 2);  // Pin 8 freq set to "pwm_freq2" on clock B
   pwm_setup( 9, pwm_freq2, 2);  // Pin 9 freq set to "pwm_freq2" on clock B
     
   // Write PWM Duty Cycle Anytime After PWM Setup
   //-----------------------------------------------------    
   pwm_write_duty( 6, pwm_duty );  // 50% duty cycle on Pin 6
   pwm_write_duty( 7, pwm_duty );  // 50% duty cycle on Pin 7
   pwm_write_duty( 8, pwm_duty );  // 50% duty cycle on Pin 8
   pwm_write_duty( 9, pwm_duty );  // 50% duty cycle on Pin 9

delay(30000);  // 30sec Delay; PWM signal will still stream
       
   // Force PWM Stop On All Pins
   //-----------------------------    
   pwm_stop( 6 );
   pwm_stop( 7 );
   pwm_stop( 8 );
   pwm_stop( 9 );
}

void loop()
{  
}





The pwm01.h library and example code were tested in IDE 1.5.1r2. Additional notes on this library:
- Applies to Arduino-Due board, PWM pins 6, 7, 8 & 9.
- Libary Does not operate on the TIO pins.
- Unique frequencies set via PWM Clock-A ("CLKA") and Clock-B ("CLKB")
Therefore, up to two unique frequencies allowed.
- Set max duty cycle counts (pwm_max_duty_Ncount) equal to 255 per Arduino approach. 
This value is best SUITED for low frequency applications (2hz to 40,000hz) such as
PWM motor drivers, 38khz infrared transmitters, etc.
- Future library versions will address high frequency applications.
- Arduino's "wiring_analog.c" function was very helpful in this effort.

Have you updated this library recently to accommodate higher frequencies? I am in need of 250kHz+ for a senior design project. I am new to Arduino, and my background is EE...I am not the best with programming.

If anyone has been able to use this code or another library to get HF PWM please let me know! Any help is appreciated.

Thanks!