On Mon, 8 Jun 2020, Christo Crause via fpc-devel wrote:
Thank you Michael and Jonas for your help and suggestions. I think I ended
up merging your suggestions, which does work for my corner case. If anyone
is interested this change can be viewed here:
https://github.com/ccrause/freepascal/commit/b28ab72ed07f11677493d5d0e37ee451d2313323
I must admit that I was thoroughly confused by the apparent lack of
semantic difference in use between InOutFunc and FlushFunc of TextRec
structure.
Could you please submit a patch with this modification to the bugtracker ?
We don't as a rule follow up on such things in github.
Michael.
Best wishes,
Christo
On Mon, Jun 8, 2020 at 9:58 PM Jonas Maebe <jo...@freepascal.org> wrote:
On 07/06/2020 19:16, Christo Crause via fpc-devel wrote:
I want to change the _haltproc for freertos ESP controllers to use
normal write/writeln functionality to send information to standard
output. On these targets the output is typically buffered serial
provided by the OS. Text output written just prior to setting the cpu
to sleep doesn't get sent, hence a flush is needed to complete data
transmission before putting the cpu to sleep. Looking at
consoleio.OpenIO there doesn't seem to be a convenient way to provide a
flush helper function. Also the RTL Flush procedure calls InOutFunc and
not FlushFunc.
What is the proper way to hook a flush helper function into the existing
RTL infrastructure?
The flushfunc is called from fpc_write_end and fpc_writeln_end. Those
helpers are automatically called after all of the individual write
operations from a write(ln) statement have been processed. So if you
implement/assign flushfunc and make it call your OS flush function, it
should work fine.
Jonas
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