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package sx127x
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import "github.com/soypat/lora"
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const (
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// 32MHz frequency for crystal oscillator is typical.
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fXOSC = 32_000_000
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// PLL uses a 19-bit sigma-delta modulator whose frequency resolution, constant over the whole frequency range, is given by
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fSTEP = fXOSC / (1 << 19)
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)
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const (
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// registers
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regFIFO = 0x00
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regOP_MODE = 0x01
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regFRF_MSB = 0x06
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regFRF_MID = 0x07
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regFRF_LSB = 0x08
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regPA_CONFIG = 0x09
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regPA_RAMP = 0x0a
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regOCP = 0x0b
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regLNA = 0x0c
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regFIFO_ADDR_PTR = 0x0d
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regFIFO_TX_BASE_ADDR = 0x0e
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regFIFO_RX_BASE_ADDR = 0x0f
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regFIFO_RX_CURRENT_ADDR = 0x10
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regIRQ_FLAGS_MASK = 0x11
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regIRQ_FLAGS = 0x12
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regRX_NB_BYTES = 0x13
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regPKT_SNR_VALUE = 0x19
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regPKT_RSSI_VALUE = 0x1a
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regRSSI_VALUE = 0x1b
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regMODEM_CONFIG_1 = 0x1d
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regMODEM_CONFIG_2 = 0x1e
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regSYMB_TIMEOUT_LSB = 0x1f
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regPREAMBLE_MSB = 0x20
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regPREAMBLE_LSB = 0x21
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regPAYLOAD_LENGTH = 0x22
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regMAX_PAYLOAD_LENGTH = 0x23
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regHOP_PERIOD = 0x24
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regMODEM_CONFIG_3 = 0x26
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regFREQ_ERROR_MSB = 0x28
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regFREQ_ERROR_MID = 0x29
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regFREQ_ERROR_LSB = 0x2a
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regRSSI_WIDEBAND = 0x2c
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regDETECTION_OPTIMIZE = 0x31
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regINVERTIQ = 0x33
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regDETECTION_THRESHOLD = 0x37
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regSYNC_WORD = 0x39
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regINVERTIQ2 = 0x3b
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regDIO_MAPPING_1 = 0x40
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regDIO_MAPPING_2 = 0x41
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regVERSION = 0x42
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regPA_DAC = 0x4d
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// PA config
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paBOOST = 0x80
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expectedVersion = 0x12
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// Bits masking the corresponding IRQs from the radio
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irqRXTOUT_MASK uint8 = 0x80
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irqRXDONE_MASK uint8 = 0x40
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irqCRCERR_MASK uint8 = 0x20
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irqHEADER_MASK uint8 = 0x10
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irqTXDONE_MASK uint8 = 0x08
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irqCDDONE_MASK uint8 = 0x04
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irqFHSSCH_MASK uint8 = 0x02
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irqCDDETD_MASK uint8 = 0x01
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// DIO function mappings D0D1D2D3
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mapDIO0_LORA_RXDONE uint8 = 0x00 // 00------
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mapDIO0_LORA_TXDONE uint8 = 0x40 // 01------
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mapDIO1_LORA_RXTOUT uint8 = 0x00 // --00----
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mapDIO1_LORA_NOP uint8 = 0x30 // --11----
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mapDIO2_LORA_NOP uint8 = 0xC0 // ----11--
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// SX127X_PAYLOAD_LENGTH uint8 = 0x40
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// Low Noise Amp
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lnaMAX_GAIN uint8 = 0x23
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lnaOFF_GAIN uint8 = 0x00
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lnaLOW_GAIN uint8 = 0x20
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// Bandwidth
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bw7_8 uint8 = 0x00
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bw10_4 uint8 = 0x01
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bw15_6 uint8 = 0x02
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bw20_8 uint8 = 0x03
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bw31_25 uint8 = 0x04
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bw41_7 uint8 = 0x05
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bw62_5 uint8 = 0x06
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bw125_0 uint8 = 0x07
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bw250_0 uint8 = 0x08
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bw500_0 uint8 = 0x09
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// Automatic gain control
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agcAUTO_OFF uint8 = 0x00
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agcAUTO_ON uint8 = 0x01
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publicSyncword = 0x34
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privateSyncword = 0x14
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)
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func bwReg(bandwidth lora.Frequency) (value byte) {
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switch {
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case bandwidth <= 7.8e3*lora.Hertz:
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value = bw7_8
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case bandwidth <= 10.4e3*lora.Hertz:
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value = bw10_4
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case bandwidth <= 15.6e3*lora.Hertz:
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value = bw15_6
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case bandwidth <= 20.8e3*lora.Hertz:
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value = bw20_8
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case bandwidth <= 31.25e3*lora.Hertz:
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value = bw31_25
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case bandwidth <= 41.7e3*lora.Hertz:
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value = bw41_7
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case bandwidth <= 62.5e3*lora.Hertz:
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value = bw62_5
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case bandwidth <= 125*lora.KiloHertz:
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value = bw125_0
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case bandwidth <= 250e3*lora.KiloHertz:
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value = bw250_0
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default:
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value = bw500_0
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}
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return value
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}
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// Operation modes.
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const (
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opmMASK uint8 = 0x07
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opmSLEEP uint8 = 0x00
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opmSTANDBY uint8 = 0x01
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opmFSTX uint8 = 0x02
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opmTX uint8 = 0x03
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opmFSRX uint8 = 0x04
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opmRX uint8 = 0x05
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opmRX_SINGLE uint8 = 0x06
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opmCAD uint8 = 0x07
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opmLORA uint8 = 0x80
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)
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// OpMode represents the available operation modes of the SX127x devices.
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type OpMode uint8
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// LoRa Operation modes.
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const (
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// Sleep mode will sleep goroutine for 15ms on SetOpmode call.
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OpSleep OpMode = iota
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// Standby mode is the default mode when waiting to operate.
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OpStandby
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// Frequency synthesis TX (FSTX)
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OpFSTx
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// Transmit (TX)
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OpTx
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// Frequency synthesis RX (FSRX)
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OpFSRx
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// Receive continuous (RXCONTINUOUS)
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OpRx
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// receive single (RXSINGLE)
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OpRxSingle
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// Channel activity detection (CAD)
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OpCAD
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opLoRaBit = OpMode(1 << 7)
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)
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func (op OpMode) String() (s string) {
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op = op &^ opLoRaBit
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switch op {
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case OpSleep:
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s = "sleep"
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case OpStandby:
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s = "standby"
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case OpFSTx:
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s = "fstx"
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case OpTx:
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s = "tx"
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case OpFSRx:
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s = "fsrx"
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case OpRx:
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s = "rx"
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case OpRxSingle:
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s = "rx-single"
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case OpCAD:
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s = "cad"
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default:
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s = "unknown"
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}
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return s
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}
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