Diff: radio/radio_sx127x.cpp

Revision:

8:5a5ea7cc946f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/radio/radio_sx127x.cpp	Wed May 23 10:20:07 2018 -0700
@@ -0,0 +1,453 @@
+#include "radio.h"
+#ifdef SX127x_H 
+#include "board.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 (RadioEvents->RxTimeout)
+        RadioEvents->RxTimeout();
+
+    radio.write_reg(REG_LR_IRQFLAGS, 0x80); // ensure RxTimeout is cleared
+}
+
+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();
+}
+
+int Radio::Send(uint8_t size, timestamp_t maxListenTime, timestamp_t channelFreeTime, int rssiThresh)
+{
+    if (radio.RegOpMode.bits.Mode == RF_OPMODE_SLEEP) {
+        radio.set_opmode(RF_OPMODE_STANDBY);
+        wait_us(1000);
+    }
+    radio.write_reg(REG_LR_IRQFLAGS, 0x08); // ensure TxDone is cleared
+    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);
+
+    if (maxListenTime > 0) {
+        int rssi;
+        us_timestamp_t startAt, chFreeAt, now;
+        lora.start_rx(RF_OPMODE_RECEIVER);
+        startAt = lpt.read_us();
+Lstart:
+        do {
+            now = lpt.read_us();
+            if ((now - startAt) > maxListenTime) {
+                return -1;
+            }
+            rssi = lora.get_current_rssi();
+        } while (rssi > rssiThresh);
+        chFreeAt = lpt.read_us();
+        do {
+            now = lpt.read_us();
+            rssi = lora.get_current_rssi();
+            if (rssi > rssiThresh) {
+                goto Lstart;
+            }
+        } while ((now - chFreeAt) < channelFreeTime);
+    }
+
+    lora.start_tx(size);
+    pinEvent.txing = 1;
+
+    return 0;
+}
+
+void Radio::Rx(unsigned timeout)
+{
+    if (timeout == 0) {
+        lora.start_rx(RF_OPMODE_RECEIVER);
+        MAC_PRINTF("startRxC ");
+    } else {
+        lora.RegIrqFlags.octet = radio.read_reg(REG_LR_IRQFLAGS);   // yyy tmp remove
+        lora.start_rx(RF_OPMODE_RECEIVER_SINGLE);
+        MAC_PRINTF("startRxS:%02x ", lora.RegIrqFlags.octet);
+    }
+
+    pinEvent.txing = 0;
+
+}
+
+
+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()
+{
+#ifdef MAC_DEBUG
+    radio.RegOpMode.octet = radio.read_reg(REG_OPMODE);
+    switch (radio.RegOpMode.bits.Mode) {
+        case RF_OPMODE_SLEEP: MAC_PRINTF("SLEEP "); break;
+        case RF_OPMODE_STANDBY: MAC_PRINTF("STBY "); break;
+        case RF_OPMODE_SYNTHESIZER_TX: MAC_PRINTF("FSTX "); break;
+        case RF_OPMODE_TRANSMITTER: MAC_PRINTF("TX "); break;
+        case RF_OPMODE_SYNTHESIZER_RX: MAC_PRINTF("FSRX "); break;
+        case RF_OPMODE_RECEIVER: MAC_PRINTF("RXC "); break;
+        case RF_OPMODE_RECEIVER_SINGLE: MAC_PRINTF("RXS "); break;
+        case RF_OPMODE_CAD: MAC_PRINTF("CAD "); break;
+    }
+
+    MAC_PRINTF("dio:%u:%u opmode:%02x %.2fMHz sf%ubw%u ", radio.dio0.read(), radio.dio1.read(), radio.RegOpMode.octet, radio.get_frf_MHz(), lora.getSf(), lora.getBw());
+    lora.RegIrqFlags.octet = radio.read_reg(REG_LR_IRQFLAGS);
+    MAC_PRINTF("irqFlags:%02x\r\n", lora.RegIrqFlags.octet);
+#endif /* MAC_DEBUG */
+}
+
+#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;
+    }
+}
+#endif /* ..SX127x_H */
+