RF69_compat.cpp

#include <JeeLib.h>
#include <avr/eeprom.h>
#include <avr/sleep.h>
#include <util/crc16.h>

volatile uint16_t rf69_crc;
volatile uint8_t rf69_buf[72];

static byte nodeid; // only used in the easyPoll code

// same as in RF12
#define RETRIES     8               // stop retrying after 8 times
#define RETRY_MS    1000            // resend packet every second until ack'ed

// same as in RF12
static uint8_t ezInterval;          // number of seconds between transmits
static uint8_t ezSendBuf[RF12_MAXDATA]; // data to send
static char ezSendLen;              // number of bytes to send
static uint8_t ezPending;           // remaining number of retries
static long ezNextSend[2];          // when was last retry [0] or data [1] sent

// void rf69_set_cs (uint8_t pin) {
// }

// void rf69_spiInit () {
// }

uint8_t rf69_initialize (uint8_t id, uint8_t band, uint8_t group, uint16_t off) {
    uint8_t freq = 0;
    switch (band) {
        case RF12_433MHZ: freq = 43; break;
        case RF12_868MHZ: freq = 86; break;
        case RF12_915MHZ: freq = 90; break;
    }
    RF69::setFrequency(freq * 10000000L + band * 2500L * off);
    RF69::group = group;
    RF69::node = id & RF12_HDR_MASK;
    delay(20); // needed to make RFM69 work properly on power-up
    if (RF69::node != 0)
        attachInterrupt(0, RF69::interrupt_compat, RISING);
    else
        detachInterrupt(0);
    RF69::configure_compat();
    return nodeid = id;
}

// same code as rf12_config(Silent), just calling rf69_initialize() instead
uint8_t rf69_configSilent () {
    uint16_t crc = ~0;
    for (uint8_t i = 0; i < RF12_EEPROM_SIZE; ++i) {
        byte e = eeprom_read_byte(RF12_EEPROM_ADDR + i);
        crc = _crc16_update(crc, e);
    }
    if (crc || eeprom_read_byte(RF12_EEPROM_ADDR + 2) != RF12_EEPROM_VERSION)
        return 0;
        
    uint8_t nodeId = 0, group = 0;   
    uint16_t frequency = 0;  
     
    nodeId = eeprom_read_byte(RF12_EEPROM_ADDR + 0);
    group  = eeprom_read_byte(RF12_EEPROM_ADDR + 1);
    frequency = eeprom_read_word((uint16_t*) (RF12_EEPROM_ADDR + 4));
    
    rf69_initialize(nodeId, nodeId >> 6, group, frequency);
    return nodeId & RF12_HDR_MASK;
}

/// @deprecated Please switch over to rf12_configSilent() and rf12_configDump().
uint8_t rf69_config (uint8_t show) {
    uint8_t id = rf69_configSilent();
    if (show)
        rf12_configDump();
    return id;
}

uint8_t rf69_recvDone () {
    rf69_crc = RF69::recvDone_compat((uint8_t*) rf69_buf);
    return rf69_crc != ~0;
}

uint8_t rf69_canSend () {
    return RF69::canSend();
}

// void rf69_sendStart (uint8_t hdr) {
// }

void rf69_sendStart (uint8_t hdr, const void* ptr, uint8_t len) {
    RF69::sendStart_compat(hdr, ptr, len);
}

// void rf69_sendStart (uint8_t hdr, const void* ptr, uint8_t len, uint8_t sync) {
// }

void rf69_sendNow (uint8_t hdr, const void* ptr, uint8_t len) {
    while (!rf69_canSend())
        rf69_recvDone();
    rf69_sendStart(hdr, ptr, len);
}

void rf69_sendWait (uint8_t mode) {
    while (RF69::sending())
        if (mode) {
            set_sleep_mode(mode == 3 ? SLEEP_MODE_PWR_DOWN :
#ifdef SLEEP_MODE_STANDBY
                           mode == 2 ? SLEEP_MODE_STANDBY :
#endif
                                       SLEEP_MODE_IDLE);
            sleep_mode();
        }
}

void rf69_onOff (uint8_t value) {
    // TODO: not yet implemented
}

void rf69_sleep (char n) {
    RF69::sleep(n == RF12_SLEEP);
}

// char rf69_lowbat () {
// }

// same as in RF12
void rf69_easyInit (uint8_t secs) {
    ezInterval = secs;
}

// same as in RF12, but with rf69_* calls i.s.o. rf12_*
char rf69_easyPoll () {
    if (rf69_recvDone() && rf12_crc == 0) {
        byte myAddr = nodeid & RF12_HDR_MASK;
        if (rf12_hdr == (RF12_HDR_CTL | RF12_HDR_DST | myAddr)) {
            ezPending = 0;
            ezNextSend[0] = 0; // flags succesful packet send
            if (rf12_len > 0)
                return 1;
        }
    }
    if (ezPending > 0) {
        byte newData = ezPending == RETRIES;
        long now = millis();
        if (now >= ezNextSend[newData] && rf69_canSend()) {
            ezNextSend[0] = now + RETRY_MS;
            if (newData)
                ezNextSend[1] = now +
                    (ezInterval > 0 ? 1000L * ezInterval
                                    : (nodeid >> 6) == RF12_868MHZ ?
                                            13 * (ezSendLen + 10) : 100);
            rf69_sendStart(RF12_HDR_ACK, ezSendBuf, ezSendLen);
            --ezPending;
        }
    }
    return ezPending ? -1 : 0;
}

// same as in RF12
char rf69_easySend (const void* data, uint8_t size) {
    if (data != 0 && size != 0) {
        if (ezNextSend[0] == 0 && size == ezSendLen &&
                                    memcmp(ezSendBuf, data, size) == 0)
            return 0;
        memcpy(ezSendBuf, data, size);
        ezSendLen = size;
    }
    ezPending = RETRIES;
    return 1;
}

void rf69_encrypt (const uint8_t*) {
    // TODO: not yet implemented
}

uint16_t rf69_control (uint16_t cmd) {
    // the RF69's API is different: use top 8 bits as reg + w/r flag, and
    // bottom 8 bits as the value to store, result is only 8 bits, not 16
    return RF69::control(cmd >> 8, cmd);
}