RF2500T and i2c

Hi,

You could use the USCI I2C lines if you do NOT want to use the RF chip because the I2C clock line (P3.2) is also connected to the CC2500. You could not use them both at the same time, however since that line is connected. You could use a software I2C with free GPIOs if you need an alternate solution, however. The following application note shows how this can be implemented: http://focus.ti.com/mcu/docs/mcusupporttechdocsc.tsp?sectionId=96&tabId=1502&abstractName=slaa330

Edit: I suppose I didn't really address your question: As mentioned above, on the eZ430-RF2500 development board the I2C clock line (P3.2) is also connected to the CC2500 chip. It turns out you have to add P3DIR |= 0x0F before P3SEL |= 0x06 in order to disable the CC2500. Once this is done the I2C clock line works correctly. Depending on how often you need to switch back and forth, this option may work for you.