Now I have jumper wired the following configuration.
1. SPI Ground, MOSI, MISO connected to both RFM12B's corresponding pins.
2. SPI nSelect0 connected to RFM12B #1.
3. SPI nSelect1 connected to RFM12B #2
4. Scope channel 1 to RFM12B #1 external mpu clock set to 2 MHz.
5. Scope Channel 2 to RFM12B #2 external mpu clock default 1 MHz.
Next step is to write the test function which does the following.
1. Create 2 WiringPi spi objects, one for each RFM12B
2. Set RFM12B #1 clock to 5 MHz.
3. Set RFM12B #2 clock to 10 MHz
.END
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