If people want to use the pinName or pinNumber for pinMode(), digitalWrite(), digitalRead() based on the schematics, the setting will fail. Also using a standard blink sketch will fail with NO Blink happening :

void setup() { Serial.begin(115200); pinMode(46, OUTPUT); } void loop() { digitalWrite(46, HIGH); // turn the LED on (HIGH is the voltage level) Serial.println("low"); delay(1000); // wait for a second digitalWrite(46, LOW); // turn the LED off by making the voltage LOW Serial.println("high"); delay(1000); // wait for a second } 

Root cause
Only the 4 external available GPIO's are defined.

Solution
The solution is to extend the 'variantPinStates' structure in the ../../variant/edge/config/pins.cpp. This will allow that ALL the connected GPIO's on the edge can be addressed. I have created a pull request for that.(#465)

Next to that the ../../cores/mbed-os/targets/TARGET_Ambiq_Micro/TARGET_Apollo3/TARGET_SFE_EDGE/PinNames.h needs to be adjusted. Attached in the updated file.
PinNames.zip

regards,
Paul