93 lines
2.6 KiB
Plaintext
93 lines
2.6 KiB
Plaintext
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/**
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* Example code for using a microchip mrf24j40 module to send and receive
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* packets using plain 802.15.4
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* Requirements: 3 pins for spi, 3 pins for reset, chip select and interrupt
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* notifications
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* This example file is considered to be in the public domain
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* Originally written by Karl Palsson, karlp@tweak.net.au, March 2011
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*/
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#include <SPI.h>
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#include <mrf24j.h>
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const int pin_reset = 6;
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const int pin_cs = 7;
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const int pin_interrupt = 5;
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Mrf24j mrf(pin_reset, pin_cs, pin_interrupt);
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long last_time;
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long tx_interval = 1000;
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void setup() {
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Serial.begin(9600);
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Serial.println("Starting to reset and startup...");
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mrf.mrf_pan_write(0xcafe);
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mrf.mrf_address16_write(0x6001);
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attachInterrupt(0, interrupt_routine, CHANGE);
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last_time = millis();
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}
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volatile uint8_t gotrx;
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volatile uint8_t txok;
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volatile uint8_t last_interrupt;
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void interrupt_routine() {
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// read and clear from the radio
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last_interrupt = mrf.mrf_read_short(MRF_INTSTAT);
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if (last_interrupt & MRF_I_RXIF) {
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gotrx = 1;
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}
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if (last_interrupt & MRF_I_TXNIF) {
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txok = 1;
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}
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}
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void loop() {
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//mrf.mrf_write_short(MRF_RXMCR, 0x01); // promiscuous!
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int tmp;
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interrupts();
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unsigned long current_time = millis();
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if (current_time - last_time > tx_interval) {
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last_time = current_time;
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Serial.println("txxxing...");
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mrf.mrf_send16(0x4202, 4, "abcd");
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}
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if (txok) {
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txok = 0;
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Serial.print("tx went ok:");
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tmp = mrf.mrf_read_short(MRF_TXSTAT);
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Serial.print(tmp);
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if (!(tmp & ~(1<<TXNSTAT))) { // 1 = failed
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Serial.print("...And we got an ACK");
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} else {
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Serial.print("retried ");
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Serial.print(tmp >> 6, HEX);
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}
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Serial.println();
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}
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if (gotrx) {
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gotrx = 0;
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noInterrupts();
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mrf.mrf_write_short(MRF_BBREG1, 0x04); // RXDECINV - disable receiver
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byte frame_length = mrf.mrf_read_long(0x300); // read start of rxfifo
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Serial.print("received a packet ");Serial.print(frame_length, DEC);Serial.println(" bytes long");
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Serial.println("Packet data:");
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for (int i = 1; i <= frame_length; i++) {
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tmp = mrf.mrf_read_long(0x300 + i);
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Serial.print(tmp, HEX);
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}
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Serial.print("\r\nLQI/RSSI=");
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byte lqi = mrf.mrf_read_long(0x300 + frame_length + 1);
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byte rssi = mrf.mrf_read_long(0x300 + frame_length + 2);
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Serial.print(lqi, HEX);
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Serial.println(rssi, HEX);
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mrf.mrf_write_short(MRF_BBREG1, 0x00); // RXDECINV - enable receiver
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interrupts();
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}
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}
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