[fpc-devel] Specific RTL for embedded target

Georg Hieber georg at ghgrp.com
Thu Nov 12 16:19:55 CET 2015


what you are referring to is mostly not the RTL (which is a standardized 
set of routines necessary to "make pascal work"). but are device drivers 
that provide a link between the RTL and the underlying hardware, tasks 
that in a non - embedded environment are performed by the operating system.

An example: the procedure "write / writeln" is part of the RTL. it does 
all the formatting, calls conversion routines where necessary (from 
numerical formats to string), and so on - but finally passes the 
formatted sequence of characters to the operating system's file I/O, 
which forma an intermediate layer, and finally calls the appropriate 
device drivers (serial, console, disk, ....).

I completely agree with you that such a library would be highly 
desirable, but it is a different thing than the RTL.

One exception: string functions, these are part of the RTL. for the AVR, 
I am working on a unit system, that is mainly writen in assembler.

best regards,

Am 11.11.2015 um 18:06 schrieb Simon Ameis:
> Hello,
> does anyone work on a library (embedded RTL) for basic embedded
> microcontroller units (MCU) like AVR or ARM?
> I think, there should be a stable interface along different MCUs for
> accessing various hardware interfaces.
> * MCU compatible/optimized string functions
> * I2C
> * SPI
> * GPIO
> * Analog Inputs/Outputs
> * PWM
> * UART
> * Timer
> * Watchdog timers
> These topics are much more dependant on the individual MCU families. It
> would be great to have a cross MCU API though.
> * MCU setup
> * Power Management
> As there are some libraries out there on the net, they could inspire the
> design of the embedded RTL.
> Are there any concerns on translating one library as long as it has a
> less restrictive license than modified LGPL used by the default RTL
> (e.g. BSD license)?
> Kind Regards
> Simon Ameis
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