overrun serial errors \ VOGONS

overrun serial errors

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First post, by mike_canada

Posted on 2021-01-30, 04:43

mike_canada Offline

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Rank: Member
Posts: 107
Joined: 2019-07-30, 02:00

I'm using DOSBOX 0.74 for Linux.

I made an application in QuickBasic and assembly that sends out a chunk of data at 57Kbps to hardware connected to the serial port. Yes I own an internal authentic UART in my computer and linux can access it perfectly fine.

As I send out and expect data in return, the linux console window I executed DOSBOX from gave me the following responses:

1DOSBox version 0.74
2Copyright 2002-2010 DOSBox Team, published under GNU GPL.
3---
4CONFIG:Loading primary settings from config file /root/.dosbox/dosbox-0.74.conf
5MIXER:Got different values from SDL: freq 11025, blocksize 352
6MIDI:Opened device:none
7Serial1: Opening ttyS0
8Serial2: Connected to 127.0.0.1
9Serial3: Connected to 127.0.0.1
10DOS keyboard layout loaded with main language code US for layout us
11MAPPER: Loading mapper settings from /root/.dosbox/mapper-0.74.map
12Serial1: Errors: Framing 0, Parity 0, Overrun RX:2 (IF0:0), TX:0, Break 0
13Serial1: Errors: Framing 0, Parity 0, Overrun RX:2 (IF0:0), TX:0, Break 0
14Serial1: Errors: Framing 0, Parity 0, Overrun RX:2 (IF0:0), TX:0, Break 0
15Serial1: Errors: Framing 0, Parity 0, Overrun RX:58 (IF0:0), TX:0, Break 0

But the ones that concern me are the Serial1 Errors.

This is my dosbox config for the serial ports:

1serial1=directserial realport:ttyS0 transparent:1 txdelay:1 rxdelay:1
2serial3=nullmodem server:127.0.0.1 port:8000 transparent:1 txdelay:1
3serial2=nullmodem server:127.0.0.1 port:8001 transparent:1
4serial4=disabled

The first one is the one I use in my application. Serial3 and Serial2 are for other debugging purposes of which one helps make a network run in DOSBOX. I have other code for the networking that is executed before-hand. I should make that as a post in itself.

So anyways, I tried various settings for my real serial port.

I tried these three lines separately:

1serial1=directserial realport:ttyS0 transparent:1 txdelay:1
2serial1=directserial realport:ttyS0 transparent:1 txdelay:1 rxdelay:1 
3serial1=directserial realport:ttyS0 transparent:1
4serial1=directserial realport:ttyS0

and /dev/ttyS0 is my serial port for linux.

and everytime I do I/O with the serial port, I keep getting the overrun errors.

Is there a way to fix this? Maybe there's something I can do at the linux level that I'm currently not aware of? Or maybe there's a way in DOSBOX to fix this?

Any idea?

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