Merge pull request #2190 from arduino/Pedromsousalima/Giga/PWMexception

[MKC-1832] MicroPython update examples with GIGA exception

content/micropython/01.basics/05.digital-analog-pins/digital-analog-pins.md

@@ -123,6 +123,8 @@ As a result, you can simulate a specific voltage written to a pin. In the exampl
 
 For this, we need to import `PWM` and `Pin` from the `machine` module.
 
+### Coding with PWM
+
 ```python
 from machine import Pin, PWM, ADC
 
@@ -134,3 +136,36 @@ pwm.freq(1000)
 while True:
     pwm.duty_u16(duty)
 ```
+In this example:
+
+- `Pin(15)` is attached to PWM
+- `duty` is set at 3000
+- `freq` is set at 1 Hz
+
+### PWM on the GIGA R1
+
+On STM32 boards like the [Arduino GIGA R1 WiFi](https://store.arduino.cc/products/giga-r1-wifi), PWM is handled differently. You need to use the `Timer` class along with the `Pin` class from the `pyb` module.
+
+Here's the correct code that works on these boards:
+
+```python
+from pyb import Pin, Timer
+
+p = Pin('A13')  # Replace 'A13' with your desired PWM-capable pin
+tim = Timer(2, freq=1000)
+ch = tim.channel(1, Timer.PWM, pin=p)
+ch.pulse_width_percent(25)
+```
+
+In this example:
+
+- `p` is a `Pin` object initialized on pin `'A13'`. This pin is set up for PWM output.
+- `tim` is a `Timer` object initialized with timer number 2 and a frequency of 1000 Hz.
+- `ch` is a PWM channel created on timer 2, channel 1, and is associated with pin `p`.
+- `ch.pulse_width_percent(25)` sets the duty cycle of the PWM signal to 25%.
+- `'A13'` is marked as **DAC1** on the GIGA R1 WiFi
+
+
+
+- Pin names and timer configurations, may vary between different STM32 boards. For more information, check out the [GIGA R1 MicroPython Guide](https://docs.arduino.cc/tutorials/giga-r1-wifi/giga-micropython/).
+