[fpc-devel] ARM embedded for ATSAM

[Alfred]

Hello,

Intro.

After a long period of using C for writing firmware for Microchip PIC24 
and PIC32, I am now switching hardware and software.
For future projects, I will use:
* the Atmel/Microchip ATSAM series; these are Cortex M-0/3/4 MPU.
* FPC for writing the firmware.
First tests show a successful use of FPC on ATSAMD14 and ATSAMD21 and 
ATSAMCx.

Sidenote.

As abstraction-layer, I use the pxl library.
See : https://asphyre.net/products/pxl
This library allows me to use apps, that access hardware, transparent on 
nearly all platforms, including Ultibo.
Code using pxl will look like this:
const
   PinLED = 9;
var
   FGPIO : TCustomGPIO;
begin
   FGPIO := TMicroGPIO.Create; //<- for arm embedded on ATSAM.
   //FGPIO := TFastGPIO.Create; //<- for RPi running Linux.
   FGPIO.PinMode[PinLED] := TPinMode.Output;
   FGPIO.PinValue[PinLED] := TPinValue.High;
   FGPIO.Destroy;
end;

Question.

There are many different ATSAM processors. All with many different 
features and peripherals.
I would like to add (many of) them as embedded targets.

To prevent cluttering of directories, I propose to use small definition 
units, that use include and switches to make a (rough) differentiation 
between ATSAM-processors. The switches are used in the include-files to 
filter features.

************************************************
unit samd10c14;

{$define samd10c14}

interface

const
   FLASH_SIZE            = $4000; //* 16 kB */
   FLASH_PAGE_SIZE       = 64;
   FLASH_NB_OF_PAGES     = 256;
   FLASH_USER_PAGE_SIZE  = 64;
   HMCRAMC0_SIZE         = $1000; //* 4 kB */

{$i atmel/sam/sam-base.inc}
{$i atmel/sam/sam-irq.inc}
{$i atmel/sam/sam-ac.inc}
{$i atmel/sam/sam-adc.inc}
......
end;
************************************************
The {$define samd10c14} is used in the include-files to enable/disable 
features.
This allows for a very efficient re-use of code.

Would the above be acceptable to be included in FPC trunk ?
Or are there other (better) ways to add ATSAM embedded targets ?

Thanks for your advice.
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