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Code before Ben Eater version?

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Posted by Robbbates   (6 posts)  [Biography] bio
Date Wed 01 May 2024 03:03 AM (UTC)
Message
Would you happen to have the code before you implemented the serial with VIA? I'd like to implement a version using the UART, but there seems to be a lot of things changed in many places in the code, specifically using the serial_in_byte_received related function. It's hard to dig out what's trying to be done in each instance. I'd like to roll it back and then

Robb
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Posted by Nick Gammon   Australia  (23,016 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Wed 01 May 2024 05:29 AM (UTC)
Message
The original code can be found here: http://www.gammon.com.au/GPascal/source/

If you look at the code here:

https://github.com/nickgammon/G-Pascal/blob/3292b3938a9c83d360fb26d42783fa3207455a16/src/hardware.inc#L212

You can see the minor changes that are made for the emulator, which I used for a lot of testing.

You basically need to replace:


  • CHRIN - gets a character from serial (blocks)
  • write_char - writes a character to serial
  • GETIN - same as CHRIN
  • serial_available - (non-blocking) see if a character is available from serial


That's it!

In the emulator CHRIN was slightly different to GETIN. CHRIN read an entire line (it made typing a line of text easier) whereas GETIN read a single character.


Look for the ".if EMULATOR" directive.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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