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→SPI Interface Pins
[[Fichier:ENG-CANSAT-RFM69HCW-SPI.png|240px]]
[[Fichier:ENG-CANSAT-RFM69HCW-SPI.png|240px]]
{{ambox|text=All the pins (except extra GPIOs) are wired thought a level shifter. This means that logical level (3.3 or 5V) will be compatible with the voltage applied on Vin!}}
* '''MISO''': Master In Slave Out. This pin is used to send data from the radio (the slave) to the micro controller (the master).
* '''MOSI''': Master Out Slave In. This pin is used by the micro controller to send data to the radio.
* '''SCK''': Clock signal used to synchronise bits exchanges between the Master and the Slave.
* '''CS''': This is the '''C'''hip '''S'''elect. Place it to LOW level to initiate transaction with the radio module. The CS pin make sense when several slaves (eg: radio module + LCD display) are present on the SPI bus.
* '''RST''': The '''reset''' pin of the radio module. Set it to LOW to reset the radio module.
* '''G0''': This is the GPIO 0 pin of the radio module. This pin has a special interruption function attached to it because it act as '''IRQ''' (Interrupt Request) pin. The radio module manipulate it to send to notification toward the micro controller. This pin is in 3.3V logic.
== Antenna Slot ==
== Antenna Slot ==