Hi Peng, > For my experiment, the RF transmission power control is important. And the > battery voltage may drop all the way as the time elapses, I'm wondering > whether the transmission power can be inflected by the battery drop? or it > doesn't matter in a certain voltage range. I know there is a voltage > regulator in the RF230 can provide 1.8v power, but why the RF230 has the > Battery monitoring function and the threshold can set in different level? > Does this mean the power supply is essential to RF230. And I want to know > the default TinyOS RF230 driver use > this function and how the MCU handle this interruption?
The RF230 driver does not use the bettery monitor at all, does not enable it so the MCU will not gt any interrupts. You can see the initialization code in the RF230LayerP.nc file. As far as I can see, the battery monitor is completely external to the radio chip, it is something extra for the MCA to use. The RF230 has its own voltage regulator and the battery monitor does not affect that. I assume that the voltage regulator works completely fine in a certian voltage range, altohugh I heard someone reporting tat the RF230 transmission rate is significantly worse for very low and very high voltages. Miklos _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
