MQX Lite systick

davidsherman — Thu, 23 Oct 2014 18:55:59 GMT

I am using a KE06 with an external 48 MHz oscillator. There is presently a bug in Processor Expert that makes it non-functional when configuring for the FBELP oscillator mode, so I have disabled the code it generates and wrote my own. I know the core clock is running at 48 MHz because the CAN and other modules are running at the correct frequency. However, I have discovered that although MQX Lite is configured for a 5 millisecond systick, it is actually running at 10 milliseconds. I looked at where it initializes the systick clock, and the counter value does correspond to a 48 MHz clock, but is it possible it's physically connected to the 24 MHz bus clock?

Re: MQX Lite systick

davidsherman — Fri, 24 Oct 2014 14:44:05 GMT

Never mind, I found it. The ICS_C2 defaulted to divide by 2, so the core clock was actually 24 MHz. The CAN worked because it was using the external clock, not the ICS output. I found that the Systick is using the core clock, not the bus clock.

topic MQX Lite systick in CodeWarrior Development Tools

MQX Lite systick

Re: MQX Lite systick