Teensy 3.2 serial2 question..

[jim lee]

The pinout picture shows Serial2 can be 10 & 9 -or- 26 & 31. How can I select the 26 &31 set as opposed to the 9 & 10 set?

Thanks!

-jim lee

 

[thebigg]

If you look in HardwareSerial.h you will find the following

    virtual void setRX(uint8_t pin) { serial_set_rx(pin); }
    virtual void setTX(uint8_t pin, bool opendrain=false) { serial_set_tx(pin, opendrain); }

edit: copied from correct core

 

[jim lee]

That still seems to get in the way of the SPI port. (That likes to use pins 9 & 10 as chip select) Or maybe I'm doing it wrong?

 Serial2.setRX(26);
 Serial2.setTX(31);
 Serial2.begin(9600);

-jim lee

 

[defragster]

See here : https://forum.pjrc.com/index.php?th...etrx-function-in-teensy-4-0.69293/post-319768

try:

 Serial2.begin(9600);
 
 Serial2.setRX(26);
 Serial2.setTX(31);

 

[jim lee]

Thanks. But that isn't working either. I have pin 7 free and I can move move pin 8's wire to pin 6. This'll leave Serial3 free of anything. I think I'll try that for now.

-jim lee

 

[defragster]

Odd, linked post suggested old problem that should have gotten fixed - maybe it broke again since?

 

[PaulStoffregen]

Or maybe I'm doing it wrong?

Code in msg #3 should not interfere with SPI.

It's possible you might be doing something wrong. Impossible to say without seeing the code.

It's also possible you've found an obscure bug in the HardwareSerial or SPI code. No way to really investigate without a program to reproduce the issue.

 

[defragster]

Post linked in #4 was T_4.0 so could test there as well as T_3.2

No resolution or test results or fix notes after this 2023:

Maybe we have a bug with setRX() and begin() when selecting the XBAR pins?

Teensyduino: Using the UART (real serial) with Teensy on the Arduino IDE

www.pjrc.com

Seems a simple test - probably more than can be done here with mostly just a left hand that is usable

 

[jim lee]

Wait, I tried switching it over to serial3, nothing. So I removed the added serial device all together. Nothing. I'm sorry to have bothered you guys. I obviously have something else going on here. Maybe I cooked one of the SPI pins messing about? Who knows. It's time for me to do a lot of back tracking to see what I broke.

-jim lee