File content as of revision 4:e4bfe9183f94:

#include "board.h"
#include "radio.h"

LowPowerTimer Radio::lpt;

void Radio::Sleep()
{
    radio.set_opmode(RF_OPMODE_SLEEP);
}

void Radio::Standby()
{
    radio.set_opmode(RF_OPMODE_STANDBY);
}

bool Radio::CheckRfFrequency(unsigned hz)
{
    return true;
}

void Radio::SetChannel(unsigned hz)
{
    radio.set_frf_MHz(hz / 1000000.0);
    MAC_PRINTF(" %uhz ", hz);
}

LowPowerTimeout TxTimeoutEvent;

void SX1272OnTimeoutIrq( void )
{
    Radio::radio.set_opmode(RF_OPMODE_STANDBY);
}

void Radio::SetTxContinuousWave(unsigned hz, int8_t dbm, unsigned timeout_us)
{
    Radio::SetChannel(hz);
    /* TODO: fsk enable, set regPacketConfig2.datamode */
    set_tx_dbm(dbm);
    TxTimeoutEvent.attach_us(SX1272OnTimeoutIrq, timeout_us);
    radio.set_opmode(RF_OPMODE_TRANSMITTER);
}

#define LORA_MAC_PRIVATE_SYNCWORD                   0x12
#define LORA_MAC_PUBLIC_SYNCWORD                    0x34
void Radio::SetPublicNetwork(bool en)
{
    radio.write_reg(REG_LR_SYNC_BYTE, en ? LORA_MAC_PUBLIC_SYNCWORD : LORA_MAC_PRIVATE_SYNCWORD);
}

uint32_t Radio::Random(void)
{
    uint32_t ret = 0;
    unsigned i;

    radio.set_opmode(RF_OPMODE_RECEIVER);
    for (i = 0; i < 32; i++) {
        uint32_t r;
        wait_us(3000);
        r = radio.read_reg(REG_LR_WIDEBAND_RSSI);
        r <<= ((i & 7) << 2);
        ret ^= r;
    }

    return ret;
}

void Radio::LoRaConfig(uint32_t bandwidth, uint8_t datarate, uint8_t coderate, uint16_t preambleLen, bool fixLen, bool crcOn)
{
    float sp;

    if (!radio.RegOpMode.bits.LongRangeMode) {
        lora.enable();
    }
    radio.write_reg(REG_LR_IRQFLAGSMASK, 0);
    
    MAC_PRINTF("sf%u bw%u ", datarate, bandwidth);
    lora.RegModemConfig2.sx1276bits.SpreadingFactor = datarate;
    if (radio.type == SX1276) {
        MAC_PRINTF("sx1276  ");
        lora.RegModemConfig2.sx1276bits.RxPayloadCrcOn = crcOn;
        lora.RegModemConfig.sx1276bits.ImplicitHeaderModeOn = fixLen;
        lora.RegModemConfig.sx1276bits.CodingRate = coderate;
        lora.RegModemConfig.sx1276bits.Bw = bandwidth + 7;
        lora.RegModemConfig3.octet = radio.read_reg(REG_LR_MODEMCONFIG3);
        sp = lora.get_symbol_period();
        if (sp > 16)
            lora.RegModemConfig3.sx1276bits.LowDataRateOptimize = 1;
        else
            lora.RegModemConfig3.sx1276bits.LowDataRateOptimize = 0;
        radio.write_reg(REG_LR_MODEMCONFIG3, lora.RegModemConfig3.octet);
    } else if (radio.type == SX1272) {
        lora.RegModemConfig.sx1272bits.RxPayloadCrcOn = crcOn;
        lora.RegModemConfig.sx1272bits.ImplicitHeaderModeOn = fixLen;
        lora.RegModemConfig.sx1272bits.CodingRate = coderate;
        lora.RegModemConfig.sx1272bits.Bw = bandwidth;
        if (lora.get_symbol_period() > 16)
            lora.RegModemConfig.sx1272bits.LowDataRateOptimize = 1;
        else
            lora.RegModemConfig.sx1272bits.LowDataRateOptimize = 0;
        MAC_PRINTF("sx1272  ");
    } else {
        MAC_PRINTF("\e[31msx127?\e[0m  ");
        return;
    }
    
    //printf(" {%02x %02x} ", lora.RegModemConfig.octet, lora.RegModemConfig2.octet);
    radio.write_reg(REG_LR_MODEMCONFIG, lora.RegModemConfig.octet);
    radio.write_reg(REG_LR_MODEMCONFIG2, lora.RegModemConfig2.octet);

    lora.RegPreamble = preambleLen;
    radio.write_u16(REG_LR_PREAMBLEMSB, lora.RegPreamble);
}

void Radio::SetRxConfig(
    RadioModems_t modem,
    uint32_t bandwidth,
    uint32_t datarate,
    uint8_t coderate,
    uint32_t bandwidthAfc,
    uint16_t preambleLen,
    uint16_t symbTimeout,
    bool fixLen,
    uint8_t payloadLen,
    bool crcOn,
    bool iqInverted)
{
    if (modem == MODEM_FSK) {
        if (radio.RegOpMode.bits.LongRangeMode)
            fsk.enable(false);
        /* TODO */
        //uint32_t bandwidthAfc,
    } else if (modem == MODEM_LORA) {
        uint16_t reg_u16;

        LoRaConfig(bandwidth, datarate, coderate, preambleLen, fixLen, crcOn);

        reg_u16 = radio.read_u16(REG_LR_MODEMCONFIG2);
        reg_u16 &= 0xfc00;
        reg_u16 |= symbTimeout;
        radio.write_u16(REG_LR_MODEMCONFIG2, reg_u16);
        //MAC_PRINTF("rxconf symbt %02x %02x mask:%02x\r\n", radio.read_reg(REG_LR_MODEMCONFIG2), radio.read_reg(REG_LR_MODEMCONFIG2+1), radio.read_reg(REG_LR_IRQFLAGSMASK));

        lora.invert_rx(iqInverted);
    }
}

void Radio::SetTxConfig(
        RadioModems_t modem,
        int8_t dbm,
        uint32_t fdev, 
        uint32_t bandwidth,
        uint32_t datarate,
        uint8_t coderate,
        uint16_t preambleLen,
        bool fixLen,
        bool crcOn,
        bool iqInverted)
{
    set_tx_dbm(dbm);

    if (modem == MODEM_FSK) {
        if (radio.RegOpMode.bits.LongRangeMode)
            fsk.enable(false);
        /* TODO */
    } else if (modem == MODEM_LORA) {
        LoRaConfig(bandwidth, datarate, coderate, preambleLen, fixLen, crcOn);

        lora.invert_tx(iqInverted);
    }
}

void Radio::SetRxMaxPayloadLength(RadioModems_t modem, uint8_t max)
{
    /* TODO fsk */
    radio.write_reg(REG_LR_RX_MAX_PAYLOADLENGTH, max);
}

const RadioEvents_t* RadioEvents;


#if 0
void dumpregs()
{
    unsigned i;
        //MAC_PRINTF("%02x) %02x\r\n", i, radio.read_reg(i));
    for (i = 0; i < 0x70; i++) {
        MAC_PRINTF("%02x) %02x\r\n", i, radio.read_reg(i));
    }
}
#endif /* if 0 */

volatile struct pe {
    uint8_t dio0 : 1;
    uint8_t dio1 : 1;
    uint8_t txing : 1;
} pinEvent;
volatile us_timestamp_t dio0at;

void
Radio::dio0UserContext()
{
    if (!pinEvent.txing) {
        lora.service();
        if (!lora.RegIrqFlags.bits.RxDone) {
            MAC_PRINTF("not-rxdone\r\n");
        } else if (RadioEvents->RxDone) {
            int8_t rssi;
            float snr = lora.RegPktSnrValue / 4.0;
            
            rssi = lora.get_pkt_rssi();
            if (snr < 0)
                rssi += snr;
            //MAC_PRINTF("rxdone snr:%.2f, rssi:%d\r\n", snr, rssi);
            RadioEvents->RxDone(radio.rx_buf, lora.RegRxNbBytes, rssi, snr, dio0at);
        }
    } 
}

void Radio::dio0isr()
{
    dio0at = lpt.read_us();
 
    if (pinEvent.txing) {
        /* TxDone handling requires low latency */
        if (RadioEvents->TxDone)
            RadioEvents->TxDone(dio0at);

        lora.service();
        pinEvent.txing = 0;
    } else
        pinEvent.dio0 = 1;
}

void Radio::dio1UserContext()
{
    lora.RegIrqFlags.octet = radio.read_reg(REG_LR_IRQFLAGS);

    MAC_PRINTF("\e[7mdio1:%02x\e[0m\r\n", lora.RegIrqFlags.octet);
    if (!lora.RegIrqFlags.bits.RxTimeout) {
        MAC_PRINTF("dio1-not-rxtimeout\r\n");
    } else if (RadioEvents->RxTimeout)
        RadioEvents->RxTimeout();
}

void Radio::dio1isr()
{
    pinEvent.dio1 = 1;
}

void Radio::Init(const RadioEvents_t* e)
{
    dio0.rise(dio0isr);
    dio1.rise(dio1isr);

    radio.rf_switch = rfsw_callback;
    boardInit();

    RadioEvents = e;
    lpt.start();
}

void Radio::Send(uint8_t size)
{
    if (radio.RegOpMode.bits.Mode == RF_OPMODE_SLEEP) {
        radio.set_opmode(RF_OPMODE_STANDBY);
        wait_us(1000);
    }
    //MAC_PRINTF("Radio::Send() dio:%u:%u opmode:%02x ", radio.dio0.read(), radio.dio1.read(), radio.read_reg(REG_OPMODE));
    lora.RegPayloadLength = size;
    radio.write_reg(REG_LR_PAYLOADLENGTH, lora.RegPayloadLength);
    lora.start_tx(size);
    pinEvent.txing = 1;
}

/*volatile RadioState_t state;

RadioState_t Radio::GetStatus()
{
    return state;
}*/

void Radio::Rx(unsigned timeout)
{
    if (timeout == 0)
        lora.start_rx(RF_OPMODE_RECEIVER);
    else
        lora.start_rx(RF_OPMODE_RECEIVER_SINGLE);

    pinEvent.txing = 0;

    MAC_PRINTF("start_rx ");
}


void Radio::ocp(uint8_t ma)
{
    if (ma < 130)
        radio.RegOcp.bits.OcpTrim = (ma - 45) / 5;
    else
        radio.RegOcp.bits.OcpTrim = (ma + 30) / 10;
    radio.write_reg(REG_OCP, radio.RegOcp.octet);
   
    radio.RegOcp.octet = radio.read_reg(REG_OCP);
    if (radio.RegOcp.bits.OcpTrim < 16)
        ma = 45 + (5 * radio.RegOcp.bits.OcpTrim);
    else if (radio.RegOcp.bits.OcpTrim < 28)
        ma = (10 * radio.RegOcp.bits.OcpTrim) - 30;
    else
        ma = 240;
    //MAC_PRINTF("Ocp: %dmA\r\n", ma); 
}


void Radio::PrintStatus()
{
    MAC_PRINTF("dio:%u:%u opmode:%02x ", radio.dio0.read(), radio.dio1.read(), radio.read_reg(REG_OPMODE));
    lora.RegIrqFlags.octet = radio.read_reg(REG_LR_IRQFLAGS);
    MAC_PRINTF("irqFlags:%02x\r\n", lora.RegIrqFlags.octet);
}

#ifdef DUTY_ENABLE
us_timestamp_t
Radio::TimeOnAir(RadioModems_t m, uint8_t pktLen)
{
    uint32_t airTime = 0;

    switch (m)
    {
    case MODEM_FSK:
        {
            /* TODO
            airTime = round( ( 8 * ( SX1272.Settings.Fsk.PreambleLen +
                                     ( ( SX1272Read( REG_SYNCCONFIG ) & ~RF_SYNCCONFIG_SYNCSIZE_MASK ) + 1 ) +
                                     ( ( SX1272.Settings.Fsk.FixLen == 0x01 ) ? 0.0 : 1.0 ) +
                                     ( ( ( SX1272Read( REG_PACKETCONFIG1 ) & ~RF_PACKETCONFIG1_ADDRSFILTERING_MASK ) != 0x00 ) ? 1.0 : 0 ) +
                                     pktLen +
                                     ( ( SX1272.Settings.Fsk.CrcOn == 0x01 ) ? 2.0 : 0 ) ) /
                                     SX1272.Settings.Fsk.Datarate ) * 1e3 );
                                     */
        }
        break;
    case MODEM_LORA:
        {
            double bw = 0.0;
            uint8_t fixLen, bandwidth, LowDatarateOptimize, coderate, crcOn ;
            if (radio.type == SX1276) {
                coderate = lora.RegModemConfig.sx1276bits.CodingRate;
                LowDatarateOptimize = lora.RegModemConfig3.sx1276bits.LowDataRateOptimize;
                fixLen = lora.RegModemConfig.sx1276bits.ImplicitHeaderModeOn;
                bandwidth = lora.RegModemConfig.sx1276bits.Bw - 7;
                crcOn = lora.RegModemConfig2.sx1276bits.RxPayloadCrcOn;
            } else if (radio.type == SX1272) {
                coderate = lora.RegModemConfig.sx1272bits.CodingRate;
                LowDatarateOptimize = lora.RegModemConfig.sx1272bits.LowDataRateOptimize;
                fixLen = lora.RegModemConfig.sx1272bits.ImplicitHeaderModeOn;
                bandwidth = lora.RegModemConfig.sx1272bits.Bw;
                crcOn = lora.RegModemConfig.sx1272bits.RxPayloadCrcOn;
            } else
                return 0;

            switch( bandwidth )
            {
            case 0: // 125 kHz
                bw = 125;//ms: 125e3;
                break;
            case 1: // 250 kHz
                bw = 250;//ms:250e3;
                break;
            case 2: // 500 kHz
                bw = 500;//ms:500e3;
                break;
            }

            // Symbol rate : time for one symbol (secs)
            double rs = bw / ( 1 << lora.RegModemConfig2.sx1276bits.SpreadingFactor );
            double ts = 1 / rs;
            // time of preamble
            double tPreamble;
            tPreamble = (lora.RegPreamble + 4.25 ) * ts;
            // Symbol length of payload and time
            double tmp = ceil( ( 8 * pktLen - 4 * lora.RegModemConfig2.sx1276bits.SpreadingFactor +
                                 28 + 16 * crcOn -
                                 ( fixLen ? 20 : 0 ) ) /
                                 ( double )( 4 * ( lora.RegModemConfig2.sx1276bits.SpreadingFactor -
                                 ( ( LowDatarateOptimize > 0 ) ? 2 : 0 ) ) ) ) *
                                 ( coderate + 4 );
            double nPayload = 8 + ( ( tmp > 0 ) ? tmp : 0 );
            double tPayload = nPayload * ts;
            // Time on air
            double tOnAir = tPreamble + tPayload;
            // return ms secs
            airTime = floor( tOnAir * 1e3 + 0.999 );
        }
        break;
    }
    return airTime;

}
#endif /* DUTY_ENABLE */

void Radio::UserContext()
{
    if (pinEvent.dio0) {
        dio0UserContext();
        pinEvent.dio0 = 0;
    }

    if (pinEvent.dio1) {
        dio1UserContext();
        pinEvent.dio1 = 0;
    }
}