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Where is TWI_SCL_M ARDUINO_SCL_PIN defined?

I'm using SDK 15.3.0 example twi_scanner with Segger Embedded Studio. I do a search entire solution for TWI_SCL_M and the only location it shows up is in main under the twi_master_init function. I can't find where the file where the #define TWI_SCL_M is located to tell me what pin it is using.

I searched the forum and there seem to be hint of config.h files, but searching the entire SDK 15.3.0 folder didn't yield anything.


Can anyone help?

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