[fpc-devel] STM32F407 fun

[Andrew Haines]

On 03/19/2016 07:36 AM, Michael Ring wrote:

> Re-reading your initial mail I am kind of wondering what you actually did ?
>
> When using -WpSTM32F407VG you will automagially use stm32f407xx.pp unit
> which is the correct one for your chip and also stack should be correct
> as ram size is set to 128MB.
>

First off thanks for looking at this. I'm not sure where you are getting 128MB...?

> How/why did you use STM32F429 unit for the chip?

There was no entry in fpc for STM32F407VG. I added
+      (controllertypestr:'STM32F407VG';     controllerunitstr:'STM32F429';        cputype:cpu_armv7em; fputype:fpu_soft; flashbase:$08000000; flashsize:$00080000; srambase:$20000000; sramsize:$00020000),

>
> Michael

>> Am 19.03.16 um 12:36 schrieb Michael Ring:
>>/Are you sure about RAM? I checked in cpuinfo, it is set to 128MB, this />>/matches what is written in the user manual, (Page 70) />>//>>/http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00037051.pdf 
/>>//>>

On the first page of that link under memories it says:

Up to 192+4 Kbytes of SRAM including 64-
Kbyte of CCM (core coupled memory) data
RAM.

Looking in the C header file stm32f4xx.h I find:
#define CCMDATARAM_BASE       ((uint32_t)0x10000000) /*!< CCM(core coupled memory) data RAM(64 KB) base address in the alias region  */
#define SRAM1_BASE            ((uint32_t)0x20000000) /*!< SRAM1(112 KB) base address in the alias region                             */
#define SRAM2_BASE            ((uint32_t)0x2001C000) /*!< SRAM2(16 KB) base address in the alias region                              */

So starting from SRAM1_BASE there is 128kB of contiguous memory.

1024 * 128 = $20000

Looking at http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00071990.pdf for STM32F429VG is says:
  Up to 256+4 KB of SRAM including 64-KB
of CCM (core coupled memory) data RAM

I couldn't find a specific header for the *29 chip but I'm assuming the extra 64kB memory it has is in that block so there is 192kB of memory. This matches the define for the *29 chip:
(controllertypestr:'STM32F429XG';     controllerunitstr:'STM32F429';        cputype:cpu_armv7em; fputype:fpu_soft; flashbase:$08000000; flashsize:$00100000; srambase:$20000000; sramsize:$00030000),

1024 * 192 = $30000

  
//>>/or are the last 16k for some special use? Could not find a hint while />>/quickly searching through the manual. />>//>>/Michael />>

I attached the changes I made to include the stm32f407vg chip in fpc.



Andrew


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