Hello all
I've been trying to acces the values of radio power, but only with
partial success. What I did was create a modified version of the
Oscilloscope application that uses SerialAM components for
comunication, and uses the radio for listening only. I use some
another mote to send random messages.
I've tried to do two things:
1 - packet Rssi
When I receive a message I call CC2420Packet.getRssi and use that
value as if it were a sensor reading. This works, but I don't what is
the meaning of this value. Is it in dB? This value has a very small
variation (comparing to the range of values that an int8_t allows) as
I move the other mote further away from the base mote
2 - ADC sampling
In this variation, I wrote a component, RadioPowerC, to use as the Sensor.
According to the manual, the ADC's channel 0 is the one for sampling
the radio signal, so I wrote the components below to be wired to an
AdcReadClientC's Atm128config interface, but it doesn't work. What
happens is that when I increase the sampling frequency in the java GUI
the value I get also increases. I'm thinking (as I changed the channel
value just for testing and the same happened) that I have to turn
something on before reading, but I don't what it could be.
thanks in advance
Hugo Sousa
/************************ RadioPowerC ******************************/
generic configuration RadioPowerC() {
provides interface Read<uint16_t>;
}
implementation {
components RadioPowerDeviceP,
new AdcReadClientC() as Adc;
Read = Adc.Read;
Adc.Atm128AdcConfig -> RadioPowerDeviceP.Atm128AdcConfig;
}
/************************ RadioPowerDeviceP ******************************/
module RadioPowerDeviceP {
provides interface Atm128AdcConfig;
}
implementation {
async command uint8_t Atm128AdcConfig.getChannel() {
return 0; // radio sginal adc channel
}
async command uint8_t Atm128AdcConfig.getRefVoltage() { return
ATM128_ADC_VREF_OFF; }
async command uint8_t Atm128AdcConfig.getPrescaler() { return
ATM128_ADC_PRESCALE; }
}
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