Well the timing of the CPU clock affects the timing of the AHB and APB clocks but they aren't 1 for 1. One of the things that has bitten me a couple times is that APB1 and APB2 have different clocks and setting baud rates for USARTS on them needs to know which clock to use.
On Wed, Jan 15, 2014 at 9:53 AM, skeezix <[email protected]> wrote: > On Wed, 15 Jan 2014, Frank Duignan wrote: > > # There are a number of options available to Tim2 - A good read of the > reference guide is required. Alternatively, if you just want a periodic > interrupt why not use systick - it is > # much simpler (doesn't even require ack'ing the irq) > > For the project in question I need pretty high speed and very > accurate timings; this sample is just to get things in hand .. objective > complete I guess.. learned a nasty :) > > Last thing I need to sort out is.. although setting to 120MHz, the > timings actually feel half that.. so probably some scaling or something in > the timer; once I get that wrinkle out, I'm in the busines. > > Porting over a basic VGA display and sprite/character-set library > from avr8 to stm32. The avr8 jhust wasn't fast enough to keep resolution > and colour up, nor had enough RAM for a framebuffer. The STM32 F2 and F4 > are far more beefy and can handle bit banging various video protocols no > problem.. as long as you can keep your timing straight :) > > jeff > > -- > If everyone would put barbecue sauce on their food, there would be no war. > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > _______________________________________________ > libopencm3-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libopencm3-devel ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ libopencm3-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libopencm3-devel
