Cannot change system speed for STM32F746IG

Posted on July 06, 2016 at 08:42

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!

Thanks