RE: How can I get an 8 MHz (PWM) signal out of a GPIO line?

Gil dePaula — Wed, 05 Mar 2014 18:03:51 GMT

Thanks Ole! I will use that example on GitHub.

This "Simple PWM" example (modified) came from a Nordic employee, including the lack of error checking on SD calls for the PPI, but he said it wasn't an "official Nordic example". :-)

In my real code I initialize the SD first.

Thanks again!

RE: How can I get an 8 MHz (PWM) signal out of a GPIO line?

Ole Morten — Wed, 05 Mar 2014 09:04:57 GMT

Have you seen this?

Beware of PAN item 33, that causes it to not be possible to get an 8 MHz clock out of first revision chips. On second revision chips this is however not a problem, and the example works as-is.

Edit: When I took a little closer look on your code, I see that you check call softdevice functions without checking error codes. That's a scary thing to do, especially when you haven't enabled the softdevice. No softdevice functions can be used when the softdevice is not enabled, and they all return 0x02, NRF_ERROR_SOFTDEVICE_NOT_ENABLED, meaning they have no effect. Lesson to be learned: Always check error codes when calling softdevice functions! :-)

Also, you seem to lack the shortcut to clear the timer on CC, i.e. a line similar to this.