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Cannot change system speed for STM32F746IG

Question asked by du_toit.jurie on Jul 6, 2016
Latest reply on Jul 6, 2016 by Clive One
I designed a PCB and I am programming the STM32F746IG via a FT2232D chip.  I have the 4 x JTAG signals connected to the STM32.

I generate code with MXCube, it compiles, but when I run it, Crossworks goes into an enless loop giving me gives me "Stopped by Vector Catch".  I have pin pointed it to the function : main.c -> SystemClock_Config(void) -> "if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)" -> "__HAL_RCC_PLL_ENABLE();" (just after the call to "WRITE_REG(...)")

I also used MXCube to generate a Keil MDK V5 project, it compiled, but the same happened in the Keil development environment.

How do one change the clock frequency of the PLL to 216MHz?

Please advise!