Arduino DUE pwm pins

[s1stemdev]

Hello. I bought arduino due few days ago. Datasheet says that DUE has pwm on 2-13 pins. But it's written on the pins 22-53 that there are pwm too. Are that pins works with pwm?

[paulpaulson]

Hello s1stemdev

Welcome to the best Arduino forum ever.

Give them a try and code a test programm simply.

[flashko]

@s1stemdev

Are that pins works with pwm?

You have a defined macro digitalPinHasPWM ( n ) ) that tells you whether the particular pin has PWM or not. Try this program.

void setup ()
{
   Serial.begin ( 115200 );
   for ( byte n = 0; n < NUM_DIGITAL_PINS; n ++ )
   {
     Serial.print ( n );
     Serial.print ( "    " );
     Serial.println ( digitalPinHasPWM ( n ) );
   }
}

void loop ()
{
   ;
}

[s1stemdev]

Thanks. Only pins 2-13 has pwm. But why does it say on pins 22-53 that they support PWM?

[paulpaulson]

@s1stemdev

But why does it say

Who ?

[steveisnoob]

Check out an Arduino Due pinout diagram. The ATSAM3X8E MCU has far more than 12 pins supporting PWM operation. Actually, just the dedicated PWM controller has 8 channels each having 2 outputs for a total 16 PWM pins. Then, there are numerous timer outputs which also support PWM operation.

If you really want to delve into it, download the datasheet, and compare it to a pinout diagram, then match the MCU pins to Arduino pins. Fair warning though; the datasheet is almost 1500 pages long, and pin functions aren't listed pin 1 to pin 144. (Yes, the MCU has 144 pins total, it's a QFP144 package.) Oh, and also, there are two pairs of pins that are tied together on the board. Check my post history if you want to explore that rabbit hole.