_GPIOF
#define PCM1_IN _GPIOF(0)
#define PCM1_CLK _GPIOF(1)
#define PCM1_SYNC _GPIOF(2)
#define PCM1_OUT _GPIOF(3)
#define UART3_RX _GPIOF(4)
#define UART3_TX _GPIOF(5)
#define UART3_RTSB _GPIOF(6)
#define UART3_CTSB _GPIOF(7)
#define NUM_GPIOS (_GPIOF(7) + 1)