Wire library for A-Star 328PB broken with version 5.0.0

[jacky4566]

Looks like the latest changes broke some of the the TWI I2C linking.

Steps to reproduce:

• New Sketch with Polulu A-star 328PB @ 3.3V, 8 MHz
• #include <Wire.h>
• compile

Error: "'TWSR' undeclared" and other references missing.

[DavidEGrayson]

Thank you for reporting this issue to us. As a workound for now, I recommend adding the following line to the A-Star boards.txt to define the things that the Wire library uses:

a-star328PB.build.extra_flags=-DTWBR=TWBR0 -DTWSR=TWSR0 -DTWAR=TWAR0 -DTWDR=TWDR0 -DTWCR=TWCR0 -DTWAMR=TWAMR0 -DTWI_vect=TWI0_vect

You can add that line anywhere in boards.txt. If you are using Windows and installed the A-Star package in the usual way, that file should be in:

C:\Users\[username]\AppData\Local\Arduino15\packages\pololu-a-star\hardware\avr\5.0.0

We will look into fixing this in a more permanent way. Please let me know if you have any further questions.

[DavidEGrayson]

The latest version (5.1.0) fixes the Wire library and the SPI library, and it also adds menus in the Arduino IDE so you can select which buses those libraries use.