Ron,
On one of my Arduino projects I finally gave up on SoftwareSerial on an Uno and
went to a Mega so I could have several real serial ports. As I recall, there
are a total of 4 available (don't remember the pin nos.). Something like ...
Serial.
Serial1.
Serial2.
Serial3.
Example for the first 2 hardware ports on a Mega:
void setup() {
// initialize both serial ports:
Serial.begin(9600);
Serial1.begin(9600);
}
Thereafter I had no serial issues. I realize that you have probably already
tried this, but I offer this small thing from my experience.
Good Luck,
Bob
-----Original Message-----
From: M100 [mailto:[email protected]] On Behalf Of Ron Lauzon
Sent: Tuesday, November 28, 2017 5:53 PM
To: [email protected]
Subject: Re: [M100] Tandy 102 Text question
I'm using pins 62 and 63. I am using an Arduino Mega (left over from a
previous project that needed more memory and the standard Arduino Uno). Those
are were the only available pins that would support the
RS-232 shifter.
I'm making the assumption based on the fact that the Arduino is faster. But
it's just an assumption. But I did do a SAVE "COM:98N1E"
in my testing and more than 80 bytes were sent to the Arduino.
For debugging right now, all characters that enter the Arduino are echoed out
the USB/Serial. So I can see everything that arrives on the serial connection.
On Tue, Nov 28, 2017 at 5:46 PM, Fugu ME100 <[email protected]> wrote:
> Which pins are you using for the software serial port? It should be
> able to run up to at least 57600bps on the Ardruino.
>
> How do you know the 102 stops sending? Could the Arduino stop receiving?
>
>
> I assume at the moment you are just reading in on the Software Serial
> port and passing it out on the USB port to make sure everything works OK?
>
> On 28/11/17, 2:07 PM, "M100 on behalf of Ron Lauzon"
> <[email protected] on behalf of [email protected]> wrote:
>
>>Here's the setup I'm going to talk about:
>>Tandy 102, serial cable to my Arduino with an RS-232 shifter. I'm
>>using the SoftwareSerial library to interface the RS-232 shifter to
>>the Arduino via the Arduino's TX/RX pins - as opposed to using the USB
>>cable.
>>
>>Software-wise, this is pretty simple. I'm just writing a text file in
>>the Text app and saving it to COM:98N1E
>>
>>Here's my frustration. No matter what I do, the 102 stops sending
>>after about 80 bytes.
>>
>>The only way I could get it to work was to reduce the speed to 300 BPS
>>(and, of course, saving to COM:38N1E).
>>
>>Keep in mind that this is the 102 sending to the Arduino. I find it
>>difficult to believe that the Arduino couldn't keep up. And when I
>>tried other BPS, it stopped in exactly the same place: at 80 bytes.
>>
>>The 102 never showed an error message. Everything looked like it
>>worked fine on that end. But the rest of the text file never appeared
>>on the Arduino side.
>>
>>The Arduino set up doesn't support hardware flow control. So I
>>thought that enableing XON/XOFF would make sure that the 102 didn't do
>>that (No, I didn't see any XON/XOFF characters on the Arduino side
>>either).
>>
>>
>>Is there some sort of strangeness in the 102 that turns some sort of
>>hardware flow-control on for speeds > 300 BPS? Or did I miss setting
>>something?
>>
>>If there was a problem with one side keeping up, I expected to see
>>dropped characters, not communications just stopping after 80 bytes.
>>
>>
>>--
>>Ron Lauzon - rlauzon at acm dot org
>> Homepage:
>>https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwebpages.
>>charter.net%2Frlauzon%2F&data=02%7C01%7Cb4me100%40hotmail.com%7C1da1d8
>>f1ef
>>344c75fb9108d536ac9c19%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C63
>>6475
>>037326050935&sdata=s6klg5s%2Bx65YTwdo%2Ba2WAWUb%2FJrU6SzRhRuIb8QbeC8%3
>>D&re
>>served=0
>> Weblog:
>>https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fronsa
>>part
>>ment.blogspot.com%2F&data=02%7C01%7Cb4me100%40hotmail.com%7C1da1d8f1ef
>>344c
>>75fb9108d536ac9c19%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475
>>0373
>>26050935&sdata=Uwa%2FOhydNv0Uof2cL%2Fpt2jMXOKEuWQwPqAf%2FQ%2FZyPYE%3D&
>>rese
>>rved=0
>>
>>TRS-80 Pocket Computer 2 - TRS-80 Pocket Computer 4 - TRS-80 Model
>>100/102 Some people like to work on old cars. But old computers are
>>cheaper and don't require a big garage.
>
>
--
Ron Lauzon - rlauzon at acm dot org
Homepage: http://webpages.charter.net/rlauzon/
Weblog: http://ronsapartment.blogspot.com/
TRS-80 Pocket Computer 2 - TRS-80 Pocket Computer 4 - TRS-80 Model 100/102 Some
people like to work on old cars. But old computers are cheaper and don't
require a big garage.
