Tim,
I posted an earlier E2E post where I implemented a similar demo as you are doing but using a different MSP430 and a CC1120. I believe you should be able to look at my code (posted on E2E) to see what I did.
http://e2e.ti.com/support/low_power_rf/f/155/p/165695/696059.aspx#696059
Regards,
/TA