hi everyone.I'm trying to index different GPIO ports and pins.  #define STEP1_HALF1_PORT GPIOA#define STEP2_HALF1_PORT GPIOB#define STEP3_HALF1_PORT GPIOA#define STEP4_HALF1_PORT GPIOC#define STEP5_HALF1_PORT GPIOBGPIO_TypeDef *Half1StepPortNum[5] = ...