Complete STM32 noobie here, I'm afraid.
I noticed in the rcc.[hc] code theres a handy dandy function that
looks ready to go to set 120MHz (which is the chip max - STM32F205RE if
memory serves, just slapped onto a breadboard; its working, I can blink
LEDs.)
rcc_clock_setup_hse_3v3 ( &hse_8mhz_3v3[CLOCK_3V3_120MHZ]);
The struct is populated in rcc.c.
Most of the documentation is missing at least for this module ..
list of function, check, but no idea if theres any setup required, how
well tested, order of oeprations, etc. But likely this is all obvious to
anyone with much on the metal ARM experience :)
Adding this line of code in place, the application (just a LED blinker
for testing sake) crashes. I've not set up a gdb server etc to trace into it so
I don't have any additional details I'm afraid :( (any tips on debugging Linux
gcc to STM32 are welcome ;) I've not hooked up any ftdi serial debuggers
etc/yadda/yadda :)
Question: are there any pre-req's for this function to work? I
know the lib works at least at some level, since blinking the LED via GPIO
function call is happy.
ie: Does the chip need to be running on an actual crystal or oscilator
to hit 120MHz, say? Or perhaps you cannot set PLL and such immediatley on
power up..
Or is it possible this is boilerplate code in libopencm3 and not well
tested (at least against bare chip, I'm betting most people are using the
eval or discovery boards for the STM32 chips, or well constructed pcbs.)
jeff
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