mrf24j40/examples/RX_only/RX_only.pde

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/**
* Example code for using a microchip mrf24j40 module to receive only
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* packets using plain 802.15.4
* Requirements: 3 pins for spi, 3 pins for reset, chip select and interrupt
* notifications
* This example file is considered to be in the public domain
* Originally written by Karl Palsson, karlp@tweak.net.au, March 2011
*/
#include <SPI.h>
#include <mrf24j.h>
const int pin_reset = 6;
const int pin_cs = 7;
const int pin_interrupt = 5;
Mrf24j mrf(pin_reset, pin_cs, pin_interrupt);
void setup() {
Serial.begin(9600);
mrf.set_pan(0xcafe);
// This is _our_ address
mrf.address16_write(0x6001);
mrf.set_channel(12);
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// uncomment if you want to receive any packet on this channel
// mrf.set_promiscuous(true);
attachInterrupt(0, interrupt_routine, CHANGE);
}
volatile uint8_t gotrx;
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void interrupt_routine() {
// read and clear from the radio
byte last_interrupt = mrf.read_short(MRF_INTSTAT);
if (last_interrupt & MRF_I_RXIF) {
gotrx = 1;
}
}
void loop() {
int tmp;
interrupts();
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if (gotrx) {
gotrx = 0;
noInterrupts();
mrf.rx_disable();
// read start of rxfifo
byte frame_length = mrf.read_long(0x300);
Serial.print("received a packet ");
Serial.print(frame_length, DEC);
Serial.println(" bytes long");
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Serial.println("Packet data:");
for (int i = 1; i <= frame_length; i++) {
tmp = mrf.read_long(0x300 + i);
Serial.print(tmp, HEX);
}
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Serial.print("\r\nLQI/RSSI=");
byte lqi = mrf.read_long(0x300 + frame_length + 1);
byte rssi = mrf.read_long(0x300 + frame_length + 2);
Serial.print(lqi, HEX);
Serial.println(rssi, HEX);
mrf.rx_enable();
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interrupts();
}
}