mrf24j40/mrf24j.cpp

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/**
* mrf24j.cpp, Karl Palsson, 2011, karlp@tweak.net.au
* modifed bsd license / apache license
*/
#include "WProgram.h"
#include "mrf24j.h"
Mrf24j::Mrf24j(int pin_reset, int pin_chip_select, int pin_interrupt) {
_pin_reset = pin_reset;
_pin_cs = pin_chip_select;
_pin_int = pin_interrupt;
pinMode(_pin_reset, OUTPUT);
pinMode(_pin_cs, OUTPUT);
pinMode(_pin_int, INPUT);
SPI.begin();
// arguably should not be here...
reset();
init();
}
void Mrf24j::reset(void) {
digitalWrite(_pin_reset, LOW);
delay(10); // just my gut
digitalWrite(_pin_reset, HIGH);
delay(20); // from manual
}
byte Mrf24j::read_short(byte address) {
digitalWrite(_pin_cs, LOW);
// 0 top for short addressing, 0 bottom for read
SPI.transfer(address<<1 & 0b01111110);
byte ret = SPI.transfer(0x0);
digitalWrite(_pin_cs, HIGH);
return ret;
}
byte Mrf24j::read_long(word address) {
digitalWrite(_pin_cs, LOW);
byte ahigh = address >> 3;
byte alow = address << 5;
SPI.transfer(0x80 | ahigh); // high bit for long
SPI.transfer(alow);
byte ret = SPI.transfer(0);
digitalWrite(_pin_cs, HIGH);
return ret;
}
void Mrf24j::write_short(byte address, byte data) {
digitalWrite(_pin_cs, LOW);
// 0 for top address, 1 bottom for write
SPI.transfer((address<<1 & 0b01111110) | 0x01);
SPI.transfer(data);
digitalWrite(_pin_cs, HIGH);
}
void Mrf24j::write_long(word address, byte data) {
digitalWrite(_pin_cs, LOW);
byte ahigh = address >> 3;
byte alow = address << 5;
SPI.transfer(0x80 | ahigh); // high bit for long
SPI.transfer(alow | 0x10); // last bit for write
SPI.transfer(data);
digitalWrite(_pin_cs, HIGH);
}
word Mrf24j::get_pan(void) {
byte panh = read_short(MRF_PANIDH);
return panh << 8 | read_short(MRF_PANIDL);
}
void Mrf24j::set_pan(word panid) {
write_short(MRF_PANIDH, panid >> 8);
write_short(MRF_PANIDL, panid & 0xff);
}
void Mrf24j::address16_write(word address16) {
write_short(MRF_SADRH, address16 >> 8);
write_short(MRF_SADRL, address16 & 0xff);
}
word Mrf24j::address16_read(void) {
byte a16h = read_short(MRF_SADRH);
return a16h << 8 | read_short(MRF_SADRL);
}
/**
* Simple send 16, with acks, not much of anything.. assumes src16 and local pan only.
* @param data
*/
void Mrf24j::send16(word dest16, byte len, char * data) {
int i = 0;
write_long(i++, 9); // header length
write_long(i++, 9+2+len); //+2 is because module seems to ignore 2 bytes after the header?!
// 0 | pan compression | ack | no security | no data pending | data frame[3 bits]
write_long(i++, 0b01100001); // first byte of Frame Control
// 16 bit source, 802.15.4 (2003), 16 bit dest,
write_long(i++, 0b10001000); // second byte of frame control
write_long(i++, 1); // sequence number 1
word panid = get_pan();
write_long(i++, panid & 0xff); // dest panid
write_long(i++, panid >> 8);
write_long(i++, dest16 & 0xff); // dest16 low
write_long(i++, dest16 >> 8); // dest16 high
word src16 = address16_read();
write_long(i++, src16 & 0xff); // src16 low
write_long(i++, src16 >> 8); // src16 high
i+=2; // All testing seems to indicate that the next two bytes are ignored.
for (int q = 0; q < len; q++) {
write_long(i++, data[q]);
}
// ack on, and go!
write_short(MRF_TXNCON, (1<<MRF_TXNACKREQ | 1<<MRF_TXNTRIG));
}
void Mrf24j::set_interrupts(void) {
// interrupts for rx and tx normal complete
write_short(MRF_INTCON, 0b11110110);
}
/** use the 802.15.4 channel numbers..
*/
void Mrf24j::set_channel(byte channel) {
write_long(MRF_RFCON0, ((channel - 11) << 4) | 0x03));
}
void Mrf24j::init(void) {
/*
// Seems a bit ridiculous when I use reset pin anyway
write_short(MRF_SOFTRST, 0x7); // from manual
while (read_short(MRF_SOFTRST) & 0x7 != 0) {
; // wait for soft reset to finish
}
*/
write_short(MRF_PACON2, 0x98); // Initialize FIFOEN = 1 and TXONTS = 0x6.
write_short(MRF_TXSTBL, 0x95); // Initialize RFSTBL = 0x9.
write_long(MRF_RFCON0, 0x03); // Initialize RFOPT = 0x03.
write_long(MRF_RFCON1, 0x01); // Initialize VCOOPT = 0x02.
write_long(MRF_RFCON2, 0x80); // Enable PLL (PLLEN = 1).
write_long(MRF_RFCON6, 0x90); // Initialize TXFIL = 1 and 20MRECVR = 1.
write_long(MRF_RFCON7, 0x80); // Initialize SLPCLKSEL = 0x2 (100 kHz Internal oscillator).
write_long(MRF_RFCON8, 0x10); // Initialize RFVCO = 1.
write_long(MRF_SLPCON1, 0x21); // Initialize CLKOUTEN = 1 and SLPCLKDIV = 0x01.
// Configuration for nonbeacon-enabled devices (see Section 3.8 “Beacon-Enabled and
// Nonbeacon-Enabled Networks”):
write_short(MRF_BBREG2, 0x80); // Set CCA mode to ED
write_short(MRF_CCAEDTH, 0x60); // Set CCA ED threshold.
write_short(MRF_BBREG6, 0x40); // Set appended RSSI value to RXFIFO.
set_interrupts();
set_channel(12);
// max power is by default.. just leave it...
//Set transmitter power - See “REGISTER 2-62: RF CONTROL 3 REGISTER (ADDRESS: 0x203)”.
write_short(MRF_RFCTL, 0x04); // Reset RF state machine.
write_short(MRF_RFCTL, 0x00); // part 2
delay(1); // delay at least 192usec
}
void Mrf24j::set_promiscuous(boolean enabled) {
if (enabled) {
write_short(MRF_RXMCR, 0x01);
} else {
write_short(MRF_RXMCR, 0x00);
}
}