In my previous post I explained how to control a RGB LED on NuttX, but at that time it doesn’t have brightness control.
Now I created a new driver that uses three PWM pins to control the LED intensive.
I posted the driver in the NuttX mailing list and Greg incorporated it on NuttX mainline (drivers/leds/rgbled.c).
A video worth more than 1 millions of words:
You can reproduce it just connection a RGB LED to STM32F4Discovery this way: Red pin connected to PE9, Green pin connected to PA1 and Blue pin connected to PB0 and compile NuttX with these commands:
$ cd nuttx $ cd tools $ ./configure.sh stm32f4discovery/rgbled $ cd .. $ make
Just write the nuttx.bin in your board and the LED fading will start after reset.
Alan C. Assis 