ARDUINO_SCL_PIN 27 // SCL signal pin ?

Question

Dear Members, 
 I saw at G:
RF5_SDK_17.0.2_d674dde\components\boards\pca10056.h 
 #define ARDUINO_SCL_PIN 27 // SCL signal pin 
 #define ARDUINO_SDA_PIN 26 // SDA signal pin 
 
 Does it mean SCL_PIN 27 = P0.27 ? 
 
 Thanks

awneil · Answer

It simply means that wherever in your 'C' source code you use ARDUINO_SCL_PIN, the preprocessor will replace it with 27; 
 similarly, wherever in your 'C' source code you use ARDUINO_SDA_PIN, the preprocessor will replace it with 26. 
 How the values 26 & 27 are interpreted depends on the context in which you use them - if you use them in places expecting them to be a pin number within P0, then that is what you'll get.

ARDUINO_SCL_PIN 27 // SCL signal pin ?

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