R: STM32F107 on STM3210C-EVAL

["Gian Maria" <g_giacomello at yahoo dot it>]

I agree with you for HSE configuration, for my opinion this type of settings
that are not common to all STM32 must be put under specific EVB.
Connectivity line is a little bit different respect other STM32.
For my tests I have implemented a new option like

        cdl_option CYGHWR_HAL_CORTEXM_STM32_CLOCK_HCLK_DIV2 {
            display         "HCLK divider 2"
            flavor          data
            default_value   5
            legal_values    { 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 }
        }

And made a restriction in the EVB to set the right value
 
    requires      { CYGHWR_HAL_CORTEXM_STM32_CLOCK_PLL_DIV2 == 5}


In this way I can control the configuration, but I don't have to modify much
the original cdl.

My idea is to make STM3210C-EVAL running with eCos and RedBoot when all is
working I want to upload it, but I'm at the beginning and I have to study a
lot of eCos platform so I don't have a date.

Best regards Gian



-----Messaggio originale-----
Da: ecos-devel-owner@ecos.sourceware.org
[mailto:ecos-devel-owner@ecos.sourceware.org] Per conto di jerzy dyrda
Inviato: lunedì 28 marzo 2011 12:47
A: ecos-devel@ecos.sourceware.org; Gian Maria
Oggetto: Re: STM32F107 on STM3210C-EVAL

Hello all,

On Monday 28 March 2011 11:51:45 qber_@poczta.onet.pl wrote:
(...)
> There is only one thing left - the RCC differences. In RM there is a
> seperate section about RCC config for CL. But at the first look it seems
> that registers are compatible.
RCC registers are extended to support 2 extra PPL's with appropriate divider
and multiplier.
Main differences is that source of PLL clock it isn't anymore taken directly
from HSE or HSE/2 clock 
but it's introduced new divider PREDIV1 thus PLLSRC bit in RCC_CFGR register
has partially 
different meaning. And another issue is external crystal. It value is 25MHz
not 8 MHz like in 
STM3210E what causes need of using second PLL to produce CPU 72MHz.

HSE == 25MHz   /  PREDIV2 == 5 -> 5MHz   *  PLLMUL2 == 8 ->  
40MHz / PREDIV1 == 5 -> 8MHz * PLLMUL == 9 -> 72MHz = SYSCLK

It's looks ugly but above method it's used in ST source code for STM3210C
evaluation board.

Best regards
jerzy