Is there an alternative way to change a GPIO state without using TI's bit field structure?
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I am using the eZdsp F28335 development board with Code Composer Studio v3.3 along with the auto-code generation of MATLAB Simulink.

Essentially, I am looking for an alternative way to write this code below, but without using the bit field structure:
 
GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0;
 
I want to find an alternative because I have run into problems with integrating code into Matlab Simulink with respect to auto-code generation for CCS v3.3. So, for my application, I want to use some code to continually read a position register on an external RDC board, and this code is contained inside of an "S-Function Builder" block in Simulink. The problem occurs when I build the project, and it says that I can't use the EALLOW, EDIS, or bit structure commands because it cannot recognize them. I'm not sure why this is the case, because code using bit field stuctures works in Simulink blocks like 'System Start' and 'Model Source'

Thanks for the help!