mbed: 4 PwmOut crashes

[Raphael]

Hi everyone,

I am using the Arch BLE running firmware version 221 (most current one). Whenever I create more than 3 PwmOut objects (from the mbed library), the MCU just hangs and nothing happens any more. I tried different pins and once I create any 4 such objects, it will freeze. With 3 it works without trouble. Why is that? Is that a limitation of mbed or of the nRF51 SDK?

[ovrebekk]

3 is the maximum number of PWM channels you can achieve with a single TIMER module in the nRF51. Without knowing the mBed implementation intimately I will assume that they only assign a single TIMER module to the PWM functionality, and that this is what is causing you issues when trying to create more than 3 PWM objects.