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CCS/TMS320F28379D: GPIO

Part Number: TMS320F28379D

Tool/software: Code Composer Studio

Hi 

I appreciate if someone can help me how the mapping of GPIOs work in CCS. For example, there is :

GpioCtrlRegs.GPAGMUX1.bit.GPIO0 = 0 ; // 0|0=GPIO 0|1=EPWM1A 0|2=rsvd 0|3=rsvd
GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;  // 1|0=GPIO 1|1=rsvd 1|2=SDAA 1|3=rsvd
                                                                 // 2|0=GPIO 2|1=rsvd 2|2=rsvd 2|3=rsvd
                                                                 // 3|0=GPIO 3|1=rsvd 3|2=rsvd 3|3=rsvd

what does  "|" means here?