typedef enum { STM32_PORT_A, STM32_PORT_B, STM32_PORT_C, STM32_PORT_D, STM32_PORT_E, STM32_PORT_F, STM32_PORT_G, STM32_PORT_H, STM32_PORT_I } STM32_PORT_t;
STM32_PORT_t enumerates the STM32 ports for the STM32F1 implementation, by name.