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mmarchetti / DirectIO

Fast, simple I/O library for Arduino
GNU Lesser General Public License v3.0
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Teensy 3.2/3.1 support #25

Open Synergyst opened 4 years ago

Synergyst commented 4 years ago

Hello,

I am curious about what would need to be done in order for me to add Teensy 3.2/3.1 support. I have a Teensy 3.2 I can test with, which has the same underlying hardware as the 3.1 aside from the 3.1 being 3.3v-only.

Kind regards.

mmarchetti commented 4 years ago

Hi,

Thanks for the question/interest! The main thing that is needed is a board definition file that maps Arduino pin numbers to ARM ports/pins.

The way these were created for most boards was to install the board support into Arduino, then run the gen_pins.py script. It reads the .h files for all the installed board types from Arduino, and creates the .h files needed by DirectIO. Presumably you would need to install something like Teensyduino (https://www.pjrc.com/teensy/td_download.html) in order for this to work. You probably need that anyway in order to compile and upload the code to the board.

Alternatively, you could create the .h file yourself based on the published pin mappings, and place it in the include/boards/avr directory.

The last step for the correct file to be used is to identify what compiler flag is used when targeting that board. From the source, it appears to be TEENSYDUINO. That has to be added like the other AVR boards here: https://github.com/mmarchetti/DirectIO/blob/master/include/ports_avr.h#L250 so the correct include file will automatically be selected for DirectIO to use.

Ping me if you have any questions/issues with getting this working.

mmarchetti commented 4 years ago

Correction, that would likely need to be in one of the ARM board subdirectories depending on which architecture flag is set during compilation. That is referenced here:

https://github.com/mmarchetti/DirectIO/blob/master/include/ports.h#L25-L34

Synergyst commented 4 years ago

image

I'm using Arduino IDE 1.8.10 on Windows. Am I doing something wrong perhaps?

mmarchetti commented 4 years ago

To find the installed packages, it has to be run against the path where the installed libraries live, which should be \Users\<username>\AppData\Local\Arduino18.

mmarchetti commented 4 years ago

OK, I tried this myself and haven't gotten gen_pins.py to work. Seems teensyduino doesn't install like the other board packages, and doesn't declare pins the same way in the header files. Your best bet might be to define the pin mapping manually. You just need to establish which pin numbers correspond to which port/pin on the microcontroller.

Synergyst commented 4 years ago

I was testing the library on the Teensy 3.2 to check if DirectIO compiled against the Teensy 3.x from a program I made for another AVR before I opened the issue. I don't need the direly need the library currently, but I'll probably get to mapping the ports, testing and then publishing any changes here if I end up really needing it for the Teensy 3.2/3.1.

It works great for the original AVR projects I needed and used it for though!