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The comments are not up to date, so don't pay to much attention to them!

I initalise the module like this:

void init_radio(char pause)
{
char freq_reg_76;
char freq_reg_77;

switch (master_station) //first decide the frequency based on ma ...

Looks resolved now - the RFM22b datasheet from Hope doesn't say (or I didn't notice) that the clear RX/TX FIFO is a double write - set '1' and then set '0'. It appears in an application note from SI. ...

Hi Dan,

I have just produced some code using an RFM22 module and a PIC16f687 to control it. Everything is fine except the use of the FIFO and what happens to the payoad - it sounds exactly like you ...