Program a slot machine

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Arduino

I am trying to program a "one armed bandit" slot machine using the bare metal approach in Arduino. I am struggling with the "load credit part" The system’s orientation must change from flat to left and back to flat for the credit to increase by one and I don't want the credit to be able to go above 15. Then when the orientation goes from flat to right back to flat I want to be able to "take the winnings and set the credit back to 0.The reason I'm finding it so difficult is because I have never used the bare metal approach before and I cannot use PinMode or digitalWrite. The main part I am struggling with is getting the seven segment display to increment its displayed value by 1 each time a credit is "added" using the accelerometer. I am using a seven segment display is anyone able to help?

Any help is appreciated

What I have tried:

float AccX, AccY, AccZ;
float GyroX, GyroY, GyroZ;