CCS/MSP430I2041: What is the correct method of selecting DCO operation in external resistor mode?

Part Number:MSP430I2041

Tool/software: Code Composer Studio

I am using the MSP430i2041 installed in a MSP-TS430RHB32A - 32-pin Target Development Board, and i would like to use the DCO in external resistor mode.

I am working with the blink program for test purposes.

I have added the file "low_level_init.c" in the project file list of my CCS V7-3 workspace (see attached image)

i have inserted the line "CSCTL0 = DCOR;"  into the "low_level_init.c" file as follows:

        /* Calibrate DCO */
        CSIRFCAL = *(TLV_address_for_parse + TLV_CAL_CSIRFCAL);
        CSIRTCAL = *(TLV_address_for_parse + TLV_CAL_CSIRTCAL);
        CSCTL0 = DCOR;
        CSERFCAL = *(TLV_address_for_parse + TLV_CAL_CSERFCAL);
        CSERTCAL = *(TLV_address_for_parse + TLV_CAL_CSERTCAL);

my two specific questions are:

1) is the above code snippet sufficient to program the MSP430 to use the external DCO resistor, or do i need additional code?

2) will the CCS compiler-linker build automatically create .obj and  include my modified "low_level_init.c", or do i need to flag this in an option panel somewhere?

thanks

Jack