mrf24j40/examples/RX_only/RX_only.pde

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2011-03-13 19:28:44 +00:00
/**
* Example code for using a microchip mrf24j40 module in receive mode only
* 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);
// uncomment if you want to receive any packet on this channel
// mrf.set_promiscuous(true);
attachInterrupt(0, interrupt_routine, CHANGE);
interrupts();
}
volatile byte gotrx;
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;
if (gotrx) {
gotrx = 0;
noInterrupts();
mrf.write_short(MRF_BBREG1, 0x04); // RXDECINV - disable receiver
byte frame_length = mrf.read_long(0x300); // read start of rxfifo
Serial.print("received a packet ");Serial.print(frame_length, DEC);Serial.println(" bytes long");
Serial.println("Packet data:");
for (int i = 1; i <= frame_length; i++) {
tmp = mrf.read_long(0x300 + i);
Serial.print(tmp, HEX);
}
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.write_short(MRF_BBREG1, 0x00); // RXDECINV - enable receiver
interrupts();
}
}