SERIN confusion on receiving a string of characters.

[CuriousOne]

Hello.
I want to do the following -
receive the data from serial port, and after code for enter is received, write next characters received into an array, and display that text on screen (8 characters total) when enter received again.

Something like this:

User presses enter and then types HELLO and enter again
and my screen displays HELLO.
If user typed in more than 8 characters before pressing the enter, just last 8 characters he entered are displayed.
As I understand, I need SERIN for this, and it should look like this:

edk:
SERIN PORTB.6,2,[13],textline[0],textline[1],textline[2],textline[3],textline[4],textline[5],textline[6],textline[7]
pause 100
gosub deka 'array to screen decoder
goto edk

I have USB2SERIAL converter TXD pin connected to PORTB.6 via 22k resistor, as PBP manual says.
Trying to send some characters via teraterm, but get nothing written into array.
I checked usb2serial adapter and it is working.

What I'm doing wrong?

[Ioannis]

Since you don't show rest of the code, only guessing I can make.

1. Try to short tx-rx of the USB converter to make sure it is working
2. The 22K maybe too large. Try a 4K7
3. The array textline needs to be filled with 8 characters before serin exits. If you type less then it just waits there forever
4. Serin will hang if the voltage input is not correct. Even if you add timeout....!
5. Are you sure your display subroutine is OK?

Ioannis

[HenrikOlsson]

What sort of USB-to-serial is this?
The fact that you're using a 22k resistor indicates the converter is an "USB-to-RS232" converter which means you should use N9600 (Mode 6) when the RS232-signal is connected (via resistor) to the PIC. Your code, on the other hand, uses T9600 (Mode 2) indicating that the converter is "USB-to-UART" in which case the resistor isn't really needed. Also, make sure you have the GND of the converter connected to GND of PIC and - obviously - that you have selected the correct baudrate in whatever terminal program you're using.

As usual, get the basics going first BEFORE you try to fill arrays, using wait characters, timeouts and so on.

[CuriousOne]

Decoder routine and other code works fine. I'll check other things too later. I already tried setting mode 6, no difference.

The USB<>Serial converter is common one, based on CH340 chip.

[CuriousOne]

Issue solved.
While manual says "Pin is automatically made an input."
In fact it does not, so I made that pin an input via TRIS register and now (mode 6) works fine.

Now how to change above code, so it displays text immediately after pressing the enter, not waiting for 8 characters to fill in?

[Ioannis]

Page 211 of the manual for the SERIN2 command

Use STR ArrayVar\n{\c} where the c is the 13 (enter).

Ioannis