lora同步字设置

据sx1302是否为public network，loragw_sx1302.c

int sx1302_lora_syncword(bool public, uint8_t lora_service_sf) {
    /* Multi-SF modem configuration */
    DEBUG_MSG("INFO: configuring LoRa (Multi-SF) SF5->SF6 with syncword PRIVATE (0x12)\n");
    lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH0_SF5_PEAK1_POS_SF5, 2);
    lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH1_SF5_PEAK2_POS_SF5, 4);
    lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH0_SF6_PEAK1_POS_SF6, 2);
    lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH1_SF6_PEAK2_POS_SF6, 4);
    if (public == true) {
        DEBUG_MSG("INFO: configuring LoRa (Multi-SF) SF7->SF12 with syncword PUBLIC (0x34)\n");
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH0_SF7TO12_PEAK1_POS_SF7TO12, 6);
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH1_SF7TO12_PEAK2_POS_SF7TO12, 8);
    } else {
        DEBUG_MSG("INFO: configuring LoRa (Multi-SF) SF7->SF12 with syncword PRIVATE (0x12)\n");
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH0_SF7TO12_PEAK1_POS_SF7TO12, 2);
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH1_SF7TO12_PEAK2_POS_SF7TO12, 4);
    }

    /* LoRa Service modem configuration */
    if ((public == false) || (lora_service_sf == DR_LORA_SF5) || (lora_service_sf == DR_LORA_SF6)) {
        DEBUG_PRINTF("INFO: configuring LoRa (Service) SF%u with syncword PRIVATE (0x12)\n", lora_service_sf);
        lgw_reg_w(SX1302_REG_RX_TOP_LORA_SERVICE_FSK_FRAME_SYNCH0_PEAK1_POS, 2);
        lgw_reg_w(SX1302_REG_RX_TOP_LORA_SERVICE_FSK_FRAME_SYNCH1_PEAK2_POS, 4);
    } else {
        DEBUG_PRINTF("INFO: configuring LoRa (Service) SF%u with syncword PUBLIC (0x34)\n", lora_service_sf);
        lgw_reg_w(SX1302_REG_RX_TOP_LORA_SERVICE_FSK_FRAME_SYNCH0_PEAK1_POS, 6);
        lgw_reg_w(SX1302_REG_RX_TOP_LORA_SERVICE_FSK_FRAME_SYNCH1_PEAK2_POS, 8);
    }

    return LGW_REG_SUCCESS;
}

其中设置代码为

if (public == true) {
        DEBUG_MSG("INFO: configuring LoRa (Multi-SF) SF7->SF12 with syncword PUBLIC (0x34)\n");
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH0_SF7TO12_PEAK1_POS_SF7TO12, 6);
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH1_SF7TO12_PEAK2_POS_SF7TO12, 8);
    } else {
        DEBUG_MSG("INFO: configuring LoRa (Multi-SF) SF7->SF12 with syncword PRIVATE (0x12)\n");
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH0_SF7TO12_PEAK1_POS_SF7TO12, 2);
        lgw_reg_w(SX1302_REG_RX_TOP_FRAME_SYNCH1_SF7TO12_PEAK2_POS_SF7TO12, 4);
    }

sx126x设置同步字相关代码

sx126x.h

/*!
 * Syncword for Private LoRa networks
 */
#define LORA_MAC_PRIVATE_SYNCWORD                   0x1424

/*!
 * Syncword for Public LoRa networks
 */
#define LORA_MAC_PUBLIC_SYNCWORD                    0x3444

radio.c

void RadioSetPublicNetwork( bool enable )
{
    RadioPublicNetwork.Current = RadioPublicNetwork.Previous = enable;

    RadioSetModem( MODEM_LORA );
    if( enable == true )
    {
        // Change LoRa modem SyncWord
        SX126xWriteRegister( REG_LR_SYNCWORD, ( LORA_MAC_PUBLIC_SYNCWORD >> 8 ) & 0xFF );
        SX126xWriteRegister( REG_LR_SYNCWORD + 1, LORA_MAC_PUBLIC_SYNCWORD & 0xFF );
    }
    else
    {
        // Change LoRa modem SyncWord
        SX126xWriteRegister( REG_LR_SYNCWORD, ( LORA_MAC_PRIVATE_SYNCWORD >> 8 ) & 0xFF );
        SX126xWriteRegister( REG_LR_SYNCWORD + 1, LORA_MAC_PRIVATE_SYNCWORD & 0xFF );
    }
}

public network    true设置同步字 0x34

                           false 0x12