Hmmm, it seems that my post body has disappeared upon posting and an unexpected error.
I shall try again and be more brief in case it timed out.
SYSCON->FLEXFRGXCTRL[0] = SYSCON_FLEXFRG0CTRL_MULT(18) | SYSCON_FLEXFRG0CTRL_DIV(255);
SYSCON clock is 12Mhz (FRO12Mhz), I expect the above to give me 18/256 divisor, so 1.0703125, or 12.84375Mhz, is the correct?
If I call CLOCK_GetFlexCommClkFreq(0) I get 631578, why is this? This does not seem correct.
If I don't configure FLEXFRGXCTRL (use default values), I get 12000000, which is the expected value.
If I setup FC0 as USART, and set USART0->BRG to 12 then I can communicate happily at 57600 which suggests that my maths is correct? (although I might be off by 1 somewhere?)
