Servo lib conflict with UART libs

[Zoom]

Hi,

There seems to be a conflict with the UART libs and the sevo lib. Is it because they both use ISRs?

How do we work around this?

Thanks,
Colin

[DavidEGrayson]

Hello, Colin.

I am not aware of any conflict between those two libraries. Are you using the official Wixel SDK or some fork of it? Why do you think there is a conflict?

–David

[Zoom]

Thanks for looking at it David. It’s the standard SDK.

If I #include <servo.h> in wireless_serial.c I get this:

?ASlink-Warning-Undefined Global ‘_ISR_T1’ referenced by module 'wireless_serial’
make: *** [apps/wireless_serial/wireless_serial.hex] Error 1

And if I #include <uart1.h> in test_servos.c I get this:

?ASlink-Warning-Undefined Global ‘_ISR_URX1’ referenced by module ‘test_servos’

?ASlink-Warning-Undefined Global ‘_ISR_UTX1’ referenced by module 'test_servos’
make: *** [apps/test_servos/test_servos.hex] Error 1

[DavidEGrayson]

If you get an “ASlink-Warning-Undefined Global” when trying to include a library, it just means that the linker was never told to link that library into your app. You can specify which libraries get linked in by adding an options.mk file to your app. See pololu.github.com/wixel-sdk/ for details or just look at the options.mk files for some of the other apps.

–David

[Zoom]

Thanks David. I would have never figured this out by myself. Even though the doc clearly says:

If your app doesn’t use the default set of libraries defined in libraries/libs.mk, you can specify which libraries your app uses by creating a file called options.mk in your app directory and defining a GNU Make variable in it called APP_LIBS that contains a list of the file names of the libraries your app uses, separated by spaces. See apps/test_board/options.mk for an example.

Colin