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TMS320F28388D: Configuring gpio using Input Xbar registers

Part Number: TMS320F28388D

Hi,

Using Input Xbar registers, gpio pins are configured for each ecap mdoule.

When i use the below line of code, module is working 

gstrInputXbarRegs.INPUT13SELECT = u16EcapPin; (gpio selection as user-input)

When I configure ECCTL0.INPUTSEL using below lines by configuring GPAPUD and GPAQSEL2 registers, the module is not working

strECap7Regs.ECCTL0.bit.INPUTSEL = 13;

Is there any other configuration needed? How to use it?

Thanks,

Subha.