Keyboard.write writing ASCII integer value as a String

Question

I have the following code:

#include <SoftwareSerial.h>
#include <Keyboard.h>

SoftwareSerial ttySerial(10, 11); // RX, TX
void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Native USB only
  }

  Serial.println("Serial Initialized");

  //Set the data rate for the SoftwareSerial port
  ttySerial.begin(115200);
  ttySerial.println("tty Initialized");

  Keyboard.begin();
}

void loop() 
{
  while (ttySerial.available())
    //Serial.write();
    Keyboard.write(ttySerial.read());

//    if (Serial.available())
//      ttySerial.write(Serial.read());
}

my problem is that ttySerial.read() is an int and I thought that the Keyboard.write method could hand integer arguments: Keyboard.write(32) should write "< space >" not "32".

Any ideas what is going on?

i do not see Keyboard.write(32) in your code ... what are you doing to send byte 32 to the sketch? — jsotola
– jsotola, Commented Mar 4, 2020 at 2:46
@jsotola thats because I am writing byte 32 to the RX Pin using SoftwareSerial. The ttySerial.read() is where I recover that and want it to be written using Keyboard.write. Simply put ttySerial.read() == byte 32 (but can also take on the form of other bytes) — Sterling Butters
– Sterling Butters, Commented Mar 4, 2020 at 2:53
And what is the problem? Is this program misbehaving? If so, what it it doing? What behavior do you expect instead? — Edgar Bonet
– Edgar Bonet, Commented Mar 4, 2020 at 12:47
you could use parseInt. or send bytes not text. what is the sender? send ' ' not "32" — Juraj
– Juraj ♦, Commented Mar 4, 2020 at 15:48
You can send arbitrary data with a JavaScript buffer. For instance, both Buffer.from([32]) and Buffer.from(' ') will give you a buffer holding a single byte with the numeric value 32. — Edgar Bonet
– Edgar Bonet, Commented Mar 4, 2020 at 17:34

Delta_G · Accepted Answer · 2020-03-05 02:45:58Z

-1

write will treat an int as a number and assume you want it converted to ascii. Try casting that to char:

Keyboard.write((char)ttySerial.read());

The print class treats char variables as if they are already ascii codes.

answered Mar 5, 2020 at 2:45

Delta_G

3,3912 gold badges13 silver badges24 bronze badges

Are you saying I should try Keyboard.print(...)? Or .write as you have?

Sterling Butters
– Sterling Butters

2020-03-05 02:58:10 +00:00
Commented Mar 5, 2020 at 2:58
I'm saying that either way you have to feed it a char if it is an ascii code. And yeah, I'd probably use print there.

Delta_G
– Delta_G

2020-03-05 03:12:23 +00:00
Commented Mar 5, 2020 at 3:12
Well I tried (char)... at one point but the behavior still wasn't write but I didn't do it using .print not sure if that would make the difference - I'll have to try it out next week but I'll let you know

Sterling Butters
– Sterling Butters

2020-03-05 03:30:35 +00:00
Commented Mar 5, 2020 at 3:30
Delta_G, read the comments please

Juraj
– Juraj ♦

2020-03-05 05:05:33 +00:00
Commented Mar 5, 2020 at 5:05

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