Comments on: RF12 configuration in EEPROM

By: José Xavier

José Xavier — Thu, 28 May 2009 20:27:31 +0000

It’s still not working but now the connections are ok

By: jcw

jcw — Thu, 28 May 2009 15:43:42 +0000

OOPS, your’right. MOSI means “Master Out Slave In”, so MOSI on MPU goes to SDI on Radio, and so on.

Thank you – I’ve edited the page to correct this mistake: http://jeelab.equi4.com/2008/12/11/good-rf-with-rfm12b/

By: José Xavier

José Xavier — Sat, 23 May 2009 22:29:27 +0000

I’m continue with the debuging process.

I think that information is wrong:

* MOSI (MCU) –> SDO (RFM)
* MISO (MCU) SCK (RFM)
* SS (MCU) –> nSEL (RFM)
* PD2 (MCU) SDI (RFM)
* MISO (MCU) <– SDO (RFM)
Can you confirm it?

I tried a very simple code, if you have a free time it's very important to me if you can give a look at my code: http://paginas.fe.up.pt/~ee06091/rfm12_test.zip

By: José Xavier

José Xavier — Sat, 23 May 2009 12:30:57 +0000

I connected a led in the IRQ line of xmit and recv and the led never blinks, it’s always off, so the IRQ line is always on and never go out from while (digitalRead(RFM_IRQ)) :S

By: jcw

jcw — Sat, 23 May 2009 08:01:33 +0000

That’s correct behavior. You’re waiting for something to happen, but at this point the receiver is off until something is sent out.

If you don’t have scope or logic analyzer, try connecting a led with a 4K7 resistor from +3.3V to the IRQ line. Then you should be able to “see” the interrupts (I’ve not tried this myself).

By: José Xavier

José Xavier — Sat, 23 May 2009 00:23:49 +0000

I try this http://jeelab.equi4.com/2008/12/11/good-rf-with-rfm12b/ and i saw that the program never go out from [code]void rf12_send(uint8_t data) {
Serial.println("ENTROU");
while (digitalRead(RFM_IRQ))
Serial.println("!");
;
rf12_xfer(0xB800 + data);
ChkSum += data;
}[/code] the while, i have in the shell always a !, any sugestion?

Thanks for all

By: jcw

jcw — Tue, 19 May 2009 21:20:09 +0000

(“only man” … well, even if that were true, that doesn’t make me the HopeRF tech support guy)

But seriously, you’re asking questions I wouldn’t know how to answer. I use the settings as currently present in the RF12 driver code, I don’t even know what some of these settings mean, sorry. Check, recheck, and simplify – that’s all I can give you as advice. I hope you can figure it out that way.

By: José Xavier

José Xavier — Tue, 19 May 2009 21:08:51 +0000

Hi again, sorry for my questions but you are the only man that i know that is working on it. What are the value that i must define in configuration for the load capacitor? In the datasheet i have values from 8,5 to 16pf

By: José Xavier

José Xavier — Mon, 18 May 2009 20:54:03 +0000

Hi, it’s still not working. I already solder the antena but i have the same resulta, i can configure it but anything else :S
the PD2 in an arduino is the pin 2 digital, right?

Any ideia?! :(

By: jcw

jcw — Sat, 16 May 2009 01:15:03 +0000

I don’t know. Look up the RFM12 specs. Look around on this blog. Here’s an example: http://jeelab.equi4.com/2009/04/19/production/ – i.e. 1 wire connected to 1 pin.

Best of luck.