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wireless.transceiver.cc1101.spin
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wireless.transceiver.cc1101.spin
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{
----------------------------------------------------------------------------------------------------
Filename: wireless.transceiver.cc1101.spin
Description: Driver for the CC1101 ISM-band transceiver
Author: Jesse Burt
Started: Mar 25, 2019
Updated: Sep 20, 2024
Copyright (c) 2024 - See end of file for terms of use.
----------------------------------------------------------------------------------------------------
}
CON
' -- User-modifiable constants
{
Do not adjust these here. Instead, override them using the constant override feature in the
parent object.
Example CC1101-App.spin:
OBJ
cc1101: "wireless.transceiver.cc1101" | PPB = 30_000
' or
cc1101: "wireless.transceiver.cc1101" | F_XOSC = 25_999_220
NOTE:
If the actual resulting frequency synthesized by the chip is lower than the value
set/returned by e.g., carrier_freq(), PPB should be set to a positive number.
If it's higher, however, PPB should be a negative number.
}
PPB = 0 ' parts-per-billion (PPB/1000 = PPM)
{ crystal freq: adjust from nominal 26MHz: calculate offset using PPB figure }
F_XOSC = round(26_000_000-(26_000_000 * (float(PPB) / float(1_000_000_000))))
{ SPI }
CS = 0
SCK = 1
MOSI = 2
MISO = 3
RST = 4
SPI_FREQ = 1_000_000
' --
TWO13 = 1 << 13 ' 2^13
TWO14 = 1 << 14 ' 2^14
TWO16 = 1 << 16 ' 2^16
TWO17 = 1 << 17 ' 2^17
TWO18 = 1 << 18 ' 2^18
TWO20 = 1 << 20 ' 2^20
TWO28 = 1 << 28 ' 2^28
U64SCALE = 1_000_000_000 ' Unsigned math scale
U64_FREQ_RES = round((float(F_XOSC) / float(TWO16))*1_000_000)
CHANSPC_RES = round((float(F_XOSC) / float(TWO18))*1_000_000)
' Auto-calibration state
NEVER = 0
IDLE_RXTX = 1
RXTX_IDLE = 2
RXTX_IDLE4 = 3
' RXOff states
RXOFF_IDLE = 0
RXOFF_FSTXON = 1
RXOFF_TX = 2
RXOFF_RX = 3
' TXOff states
TXOFF_IDLE = 0
TXOFF_FSTXON = 1
TXOFF_TX = 2
TXOFF_RX = 3
' Modulation formats
FSK2 = %000
GFSK = %001
ASKOOK = %011
FSK4 = %100
MSK = %111
' CC1101 I/O pin output signals
TRIG_RXTHRESH = $00
TRIG_RXTHRESH_END_PKT = $01
TRIG_RXOVERFLOW = $04
TRIG_TXUNDERFLOW = $05
TRIG_SYNCWORD_TXRX = $06
TRIG_PREAMBLE_QUALITY = $08
TRIG_CARRIER = $0E
IO_CHIP_RDYn = $29
IO_XOSC_STABLE = $2B
IO_HI_Z = $2E
IO_CLK_XODIV1 = $30
IO_CLK_XODIV192 = $3F
' Packet Length configuration modes
PKTLEN_FIXED = 0
PKTLEN_VAR = 1
PKTLEN_INF = 2
' Syncword qualifier modes
SYNCMODE_NONE = 0
SYNCMODE_1516 = 1
SYNCMODE_1616 = 2
SYNCMODE_3032 = 3
SYNCMODE_CS_ONLY = 4
SYNCMODE_1516_CS = 5
SYNCMODE_1616_CS = 6
SYNCMODE_3032_CS = 7
' Address check modes
ADRCHK_NONE = 0
ADRCHK_CHK_NO_BCAST = 1
ADRCHK_CHK_00_BCAST = 2
ADRCHK_CHK_00_FF_BCAST = 3
' AGC modes
AGC_NORMAL = %00
AGC_FREEZE_ON_SYNC = %01
AGC_FREEZE_A_AUTO_D = %10
AGC_OFF = %11
VAR
byte _CS
byte _status
OBJ
{ SPI? }
{ decide: Bytecode SPI engine, or PASM? Default is PASM if BC isn't specified }
#ifdef CC1101_SPI_BC
spi: "com.spi.25khz.nocog" ' BC SPI engine
#else
spi: "com.spi.1mhz" ' PASM SPI engine
#endif
core: "core.con.cc1101" ' HW-specific constants
time: "time" ' timekeeping methods
u64: "math.unsigned64" ' unsigned 64-bit math
PUB null()
' This is not a top-level object
PUB start(): status
' Start the driver using default I/O settings
return startx(CS, SCK, MOSI, MISO)
PUB startx(CS_PIN, SCK_PIN, MOSI_PIN, MISO_PIN): status
' Start the driver with custom I/O settings
' CS_PIN: Chip Select (0..31)
' SCK_PIN: Serial Clock (0..31)
' MOSI_PIN: Master-Out Slave-In (0..31)
' MISO_PIN: Master-In Slave-Out (0..31)
' Returns:
' cog ID+1 of SPI engine on success (= calling cog ID+1, if the bytecode SPI engine is used)
' 0 on failure
if ( lookdown(CS_PIN: 0..31) and lookdown(SCK_PIN: 0..31) and ...
lookdown(MOSI_PIN: 0..31) and lookdown(MISO_PIN: 0..31) )
if ( status := spi.init(SCK_PIN, MOSI_PIN, MISO_PIN, core.SPI_MODE) )
time.usleep(core.T_POR)
_CS := CS_PIN
outa[_CS] := 1
dira[_CS] := 1
if ( lookdown(dev_id(): $04, $14..$FE) )
reset()
return
' if this point is reached, something above failed
' Double check I/O pin assignments, connections, power
' Lastly - make sure you have at least one free core/cog
return FALSE
PUB stop()
' Stop the driver
spi.deinit()
_CS := _status := 0
PUB defaults()
' Factory default settings
' This is what _would_ be called:
{
node_addr($00)
addr_check(ADRCHK_NONE)
payld_status_ena(TRUE)
carrier_freq(800_000_000)
channel(0)
crc_auto_flush_ena(FALSE)
crc_check_ena(TRUE)
data_rate(115_200)
dc_block_ena(TRUE)
freq_dev(47_607)
fec_ena(FALSE)
gpio0(IO_CLK_XODIV192)
gpio1(IO_HI_Z)
gpio2(IO_CHIP_RDYn)
interm_freq(380_859)
manchester_enc(FALSE)
modulation(FSK2)
payld_len(255)
payld_len_cfg(PKTLEN_VAR)
preamble_len(2)
preamble_qual(0)
rx_bw(203)
rx_fifo_thresh(32)
syncwd_mode(SYNCMODE_1616)
set_syncwd($D391)
data_whiten_ena(TRUE)
}
' but to save code space, just call reset(), instead
reset()
PUB preset_fixed_pkt_len()
' Like preset_robust1(), but sets packet length config mode to fixed-length
preset_robust1()
payld_len_cfg(PKTLEN_FIXED)
PUB preset_robust1()
' Like defaults, but with some basic improvements in robustness:
' * check/filter address field in payload (2nd byte), ignore broadcast address
' * perform oscillator auto-cal when transitioning from idle to RX or TX
' * reject packets with a bad CRC (i.e., flush from receive buffer)
' * turn off oscillator output on GPIO0 (GDO0)
reset()
addr_check(ADRCHK_CHK_NO_BCAST)
auto_cal_mode(IDLE_RXTX)
crc_auto_flush_ena(TRUE)
gpio0(IO_HI_Z)
PUB addr_check(mode=-2): curr_mode
' Enable address checking/matching/filtering
' Valid values:
' *ADRCHK_NONE (0): No address check
' ADRCHK_CHK_NO_BCAST (1): Check address, but ignore broadcast addresses
' ADRCHK_CHK_00_BCAST (2): Check address, and also respond to $00 broadcast address
' ADRCHK_CHK_00_FF_BCAST (3): Check address, and also respond to both $00 and $FF broadcast addresses
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.PKTCTRL1, 1, @curr_mode)
case mode
0..3:
mode := mode & core.ADR_CHK_BITS
mode := ((curr_mode & core.ADR_CHK_MASK) | mode) & core.PKTCTRL1_MASK
writereg(core.PKTCTRL1, 1, @mode)
other:
return curr_mode & core.ADR_CHK_BITS
PUB after_rx(next_state=-2): curr_set
' Defines the state the radio transitions to after a packet is successfully received
' Valid values:
' *RXOFF_IDLE (0) - Idle state
' RXOFF_FSTXON (1) - Turn frequency synth on and ready at TX freq. To transmit, call TX
' RXOFF_TX (2) - Start sending preamble
' RXOFF_RX (3) - Wait for more packets
' Any other value polls the chip and returns the current setting
curr_set := 0
readreg(core.MCSM1, 1, @curr_set)
case next_state
0..3:
next_state := next_state << core.RXOFF_MODE
next_state := ((curr_set & core.RXOFF_MODE_MASK) | next_state)
writereg(core.MCSM1, 1, @next_state)
other:
return (curr_set >> core.RXOFF_MODE) & core.RXOFF_MODE_BITS
PUB after_tx(next_state=-2): curr_set
' Defines the state the radio transitions to after a packet is successfully transmitted
' Valid values:
' *TXOFF_IDLE (0) - Idle state
' TXOFF_FSTXON (1) - Turn frequency synth on and ready at TX freq. To transmit, call TX
' TXOFF_TX (2) - Start sending preamble
' TXOFF_RX (3) - Wait for packets (RX)
' Any other value polls the chip and returns the current setting
curr_set := 0
readreg(core.MCSM1, 1, @curr_set)
case next_state
0..3:
next_state := next_state << core.TXOFF_MODE
next_state := ((curr_set & core.TXOFF_MODE_MASK) | next_state)
writereg(core.MCSM1, 1, @next_state)
other:
return (curr_set >> core.TXOFF_MODE) & core.TXOFF_MODE_BITS
PUB agc_filt_len(len=-2): curr_len
' For 2FSK, 4FSK, MSK, set averaging length for amplitude from the channel filter, in samples
' For OOK/ASK, set decision boundary for reception
' Valid values:
' FSK/MSK OOK/ASK
' Samples decision boundary
' 8 4dB
' 16 8dB
' 32 12dB
' 64 16dB
' Any other value polls the chip and returns the current setting
curr_len := 0
readreg(core.AGCCTRL0, 1, @curr_len)
case len
8, 16, 32, 64:
len := lookdownz(len: 8, 16, 32, 64) & core.FILT_LEN_BITS
len := ((curr_len & core.FILT_LEN_MASK) | len) & core.AGCCTRL0_MASK
writereg(core.AGCCTRL0, 1, @len)
other:
curr_len := curr_len & core.FILT_LEN_BITS
return lookupz(curr_len: 8, 16, 32, 64)
PUB agc_mode(mode=-2): curr_mode
' Set AGC mode
' Valid values:
' *AGC_NORMAL (0): Always adjust gain when required
' AGC_FREEZE_ON_SYNC (1): Gain setting is frozen when a sync word has been found
' AGC_FREEZE_A_AUTO_D (2): Freeze analog gain, but autmatically adjust digital gain
' AGC_OFF (3): Freeze both analog and digital gain settings
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.AGCCTRL0, 1, @curr_mode)
case mode
AGC_NORMAL, AGC_FREEZE_ON_SYNC, AGC_FREEZE_A_AUTO_D, AGC_OFF:
mode <<= core.AGC_FREEZE
mode := ((curr_mode & core.AGC_FREEZE_MASK) | mode) & core.AGCCTRL0_MASK
writereg(core.AGCCTRL0, 1, @mode)
other:
return (curr_mode >> core.AGC_FREEZE) & core.AGC_FREEZE_BITS
PUB auto_cal_mode(mode=-2): curr_mode
' When to perform auto-calibration
' Valid values:
' *NEVER (0) - Never (manually calibrate)
' IDLE_RXTX (1) - When transitioning from IDLE to RX/TX
' RXTX_IDLE (2) - When transitioning from RX/TX to IDLE
' RXTX_IDLE4 (3) - Every 4th time mode transitioning from RX/TX to IDLE (power-saving)
curr_mode := 0
readreg(core.MCSM0, 1, @curr_mode)
case mode
NEVER, IDLE_RXTX, RXTX_IDLE, RXTX_IDLE4:
mode := mode << core.FS_AUTOCAL
mode := ((curr_mode & core.FS_AUTOCAL_MASK) | mode)
writereg(core.MCSM0, 1, @mode)
other:
return (curr_mode >> core.FS_AUTOCAL) & core.FS_AUTOCAL_BITS
PUB cal_freq_synth()
' Calibrate the frequency synthesizer
writereg(core.CS_SCAL, 0, 0)
PUB carrier_freq(freq=-2): curr_freq
' Set carrier/center frequency, in Hz
' Valid values:
' 300_000_000..348_000_000, 387_000_000..464_000_000, 779_000_000..928_000_000
' Default value: Approx 800_000_000
' Any other value polls the chip and returns the current setting
' NOTE: The actual set frequency has a resolution of fXOSC/2^16 (i.e., approx 397Hz)
case freq
300_000_000..348_000_000, 387_000_000..464_000_000, 779_000_000..928_000_000:
freq := u64.multdiv(F_XOSC, U64SCALE, freq)
freq := u64.multdiv(TWO16, U64SCALE, freq)
writereg(core.FREQ2, 3, @freq)
other:
curr_freq := 0
readreg(core.FREQ2, 3, @curr_freq)
return u64.multdiv(curr_freq, U64_FREQ_RES, 1_000_000)
PUB carrier_sense_thresh(thresh=-2): curr_thr
' Set relative change threshold for asserting carrier sense, in dB
' Valid values:
' *0: Disabled
' 6: 6dB increase in RSSI
' 10: 10dB increase in RSSI
' 14: 14dB increase in RSSI
' Any other value polls the chip and returns the current setting
curr_thr := 0
readreg(core.AGCCTRL1, 1, @curr_thr)
case thresh
0, 6, 10, 14:
thresh := lookdownz(thresh: 0, 6, 10, 14) << core.CSENSE_REL_THR
thresh := ((curr_thr & core.CSENSE_REL_THR_MASK) | thresh) & core.AGCCTRL1_MASK
writereg(core.AGCCTRL1, 1, @thresh)
other:
curr_thr := (curr_thr >> core.CSENSE_REL_THR) & core.CSENSE_REL_THR_BITS
return lookupz(curr_thr: 0, 6, 10, 14)
PUB carrier_sense_abs_thresh(thresh=-2): curr_thr
' Set absolute change threshold for asserting carrier sense, in dB
' Valid values:
' %0000..%1111
' Default value: %0000
' Any other value polls the chip and returns the current setting
curr_thr := 0
readreg(core.AGCCTRL1, 1, @curr_thr)
case thresh
%0000..%1111:
thresh := thresh & core.CSENSE_ABS_THR_BITS
thresh := ((curr_thr & core.CSENSE_ABS_THR_MASK) | thresh) & core.AGCCTRL1_MASK
writereg(core.AGCCTRL1, 1, @thresh)
other:
return curr_thr & core.CSENSE_ABS_THR_BITS
PUB channel(number=-2): curr_chan
' Set channel number
' Valid values: 0..255
' Default value: 0
' Any other value polls the chip and returns the current setting
' NOTE: Resulting frequency = (channel number * channel spacing) + base freq
case number
0..255:
number &= core.CHANNR_MASK
writereg(core.CHANNR, 1, @number)
other:
curr_chan := 0
readreg(core.CHANNR, 1, @curr_chan)
return curr_chan
PUB channel_spacing(width=-2): curr_wid | chanspc_e, chanspc_m
' Set channel spacing, in Hz
' Valid values: 25_390..405_456 (default: 199_951)
' Any other value polls the chip and returns the current setting
case width
25_390..405_456:
repeat chanspc_e from 0 to 3
chanspc_m := (width / (99 * (1 << chanspc_e)) - 256)
if ( (chanspc_m => 0) and (chanspc_m < 256) )
quit
width.byte[0] &= core.CHANSPC_E_MASK
width.byte[0] |= chanspc_e
width.byte[1] := chanspc_m
writereg(core.MDMCFG1, 2, @width)
other:
longfill(@chanspc_e, 0, 2)
curr_wid := 0
readreg(core.MDMCFG1, 2, @curr_wid)
chanspc_e := curr_wid.byte[0] & core.CHANSPC_E_BITS
chanspc_m := curr_wid.byte[1]
curr_wid := (256 + chanspc_m) * (1 << chanspc_e)
return u64.multdiv(CHANSPC_RES, curr_wid, 1_000_000)
PUB crc_check_ena(mode=-2): curr_mode
' Enable CRC calc (TX mode) and check (RX mode)
' Valid values:
' *TRUE (-1 or 1)
' FALSE (0)
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.PKTCTRL0, 1, @curr_mode)
case ||(mode)
0, 1:
mode := ||(mode) << core.CRC_EN
mode := ((curr_mode & core.CRC_EN_MASK) | mode) & core.PKTCTRL0_MASK
writereg(core.PKTCTRL0, 1, @mode)
other:
return ((curr_mode >> core.CRC_EN) & %1) == 1
PUB crc_auto_flush_ena(mode=-2): curr_mode
' Enable automatic flush of RX FIFO when CRC check fails
' Valid values:
' TRUE (-1 or 1)
' *FALSE (0)
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.PKTCTRL1, 1, @curr_mode)
case ||(mode)
0, 1:
mode := ||(mode) << core.CRC_AUTOFLUSH
mode := ((curr_mode & core.CRC_AUTOFLUSH_MASK) | mode) & core.PKTCTRL1_MASK
writereg(core.PKTCTRL1, 1, @mode)
other:
return ((curr_mode >> core.CRC_AUTOFLUSH) & %1) == 1
PUB data_rate(rate=-2): curr_rate | curr_exp, curr_mant, e, m
' Set on-air data rate, in bps
' Valid values: 600..500_000
' Default value: 115_051
' Any other value polls the chip and returns the current setting
longfill(@curr_exp, 0, 4)
readreg(core.MDMCFG4, 1, @curr_exp)
readreg(core.MDMCFG3, 1, @curr_mant)
case rate
600..500_000:
e := >|( u64.multdiv(rate, TWO20, F_XOSC) )-1
m := (u64.multdiv( rate, ...
TWO28, ...
u64.multdiv(F_XOSC, ...
(1 << e), ...
1_000) ...
)-256_000) / 1_000
if ( m > 255 ) ' mantissa overflow?
m := 0 ' clear and carry it into the exponent
e := (e + 1) <# $0E
e |= (curr_exp & core.DRATE_E_MASK)
writereg(core.MDMCFG4, 1, @e)
writereg(core.MDMCFG3, 1, @m)
other:
curr_exp &= core.DRATE_E_BITS
curr_rate := u64.multdiv( (256+curr_mant) * (1 << curr_exp), U64SCALE, TWO28)
return u64.multdiv(curr_rate, F_XOSC, U64SCALE)
PUB data_whiten_ena(mode=-2): curr_mode
' Enable data whitening
' Valid values: *TRUE (-1 or 1), FALSE (0)
' Any other value polls the chip and returns the current setting
' NOTE: Applies to all data, except the preamble and sync word.
curr_mode := 0
readreg(core.PKTCTRL0, 1, @curr_mode)
case ||(mode)
0, 1:
mode := ||(mode) << core.WHITE_DATA
mode := ((curr_mode & core.WHITE_DATA_MASK) | mode)
writereg(core.PKTCTRL0, 1, @mode)
other:
return ((curr_mode >> core.WHITE_DATA) & %1) == 1
PUB dc_block_ena(mode=-2): curr_mode
' Enable digital DC blocking filter (before demod)
' Valid values: *TRUE (-1 or 1), FALSE
' Any other value polls the chip and returns the current setting
' NOTE: Enable for better sensitivity (default).
' Disable for optimizing current usage. Only for data rates 250kBaud and lower
curr_mode := 0
readreg(core.MDMCFG2, 1, @curr_mode)
case mode := ||(mode)
0, 1:
mode := ((mode ^ 1) << core.DCFILT_OFF)
mode := ((curr_mode & core.DCFILT_OFF_MASK) | mode)
writereg(core.MDMCFG2, 1, @mode)
other:
return (((curr_mode >> core.DCFILT_OFF) & %1) ^ 1) == 1
PUB dev_id(): id
' Chip version number
' Returns: $04 (Rev. E), $14 (Rev. I)
' NOTE: Datasheet states this value is subject to change without notice
id := 0
readreg(core.VERSION, 1, @id)
PUB dvga_gain(gain=-255): curr_gain
' Set Digital Variable Gain Amplifier gain maximum level
' Valid values:
' *0 - Highest gain setting
' -1 - Highest gain setting-1
' -2 - Highest gain setting-2
' -3 - Highest gain setting-3
' Any other value polls the chip and returns the current setting
curr_gain := 0
readreg(core.AGCCTRL2, 1, @curr_gain)
case gain
-3..0:
gain := ||(gain) << core.MAX_DVGA_GAIN
gain := ((curr_gain & core.MAX_DVGA_GAIN_MASK) | gain)
writereg(core.AGCCTRL2, 1, @gain)
other:
curr_gain := (curr_gain >> core.MAX_DVGA_GAIN) & core.MAX_DVGA_GAIN_BITS
return curr_gain * -1
PUB fec_ena(mode=-2): curr_mode
' Enable forward error correction with interleaving
' Valid values: TRUE (-1 or 1), *FALSE (0)
' Any other value polls the chip and returns the current setting
' NOTE: Only supported when payld_len_cfg() == PKTLEN_FIXED
curr_mode := 0
readreg(core.MDMCFG1, 1, @curr_mode)
case ||(mode)
0, 1:
mode := ||(mode) << core.FEC_EN
mode := ((curr_mode & core.FEC_EN_MASK) | mode) & core.MDMCFG1_MASK
writereg(core.MDMCFG1, 1, @mode)
other:
return ((curr_mode >> core.FEC_EN) & %1) == 1
PUB fifo_rx_bytes(): nr_bytes
' Returns number of bytes in RX FIFO
' NOTE: The MSB indicates if the RX FIFO has overflowed.
nr_bytes := 0
readreg(core.RXBYTES, 1, @nr_bytes)
PUB fifo_tx_bytes(): nr_bytes
' Returns number of bytes in TX FIFO
' NOTE: The MSB indicates if the TX FIFO is underflowed.
nr_bytes := 0
readreg(core.TXBYTES, 1, @nr_bytes)
PUB flush_rx()
' Flush receive FIFO/buffer
writereg(core.CS_SFRX, 0, 0)
PUB flush_tx()
' Flush transmit FIFO/buffer
writereg(core.CS_SFTX, 0, 0)
PUB freq_dev(freq=-2): curr_freq | tmp, deviat_m, deviat_e, tmp_m
' Set frequency deviation from carrier, in Hz
' Valid values:
' 1_586..380_859 (default: 47_607)
' NOTE: This setting has no effect when Modulation format is ASK/OOK.
' NOTE: This setting applies to both TX and RX roles. When role is RX, setting must be
' approximately correct for reliable demodulation.
' Any other value polls the chip and returns the current setting
case freq
1_587..380_859:
deviat_e := u64.multdiv(freq, TWO14, F_XOSC)
deviat_e := >|(deviat_e)-1
tmp_m := F_XOSC * (1 << deviat_e)
deviat_m := u64.multdiv(freq, TWO17, tmp_m)
freq := (deviat_e << core.DEVIAT_E) | deviat_m
freq &= core.DEVIATN_MASK
writereg(core.DEVIATN, 1, @freq)
other:
longfill(@tmp, 0, 4)
readreg(core.DEVIATN, 1, @tmp)
deviat_m := tmp & core.DEVIAT_M_BITS
deviat_e := (tmp >> core.DEVIAT_E) & core.DEVIAT_E_BITS
return F_XOSC / TWO17 * (8 + deviat_m) * (1 << deviat_e)
PUB freq_synth_ena()
' Enable frequency synthesizer and calibrate
writereg(core.CS_SFSTXON, 0, 0)
PUB gpio0(mode=-2): curr_mode 'XXX review: consolidation with other like methods? (API change)
' Configure test signal output on GDO0 pin
' Valid values: $00..$0F, $16..$17, $1B..$1D, $24..$39, $41, $43, $46..$3F (default: $3f)
' (see IO_* constants near top of this file)
' Any other value polls the chip and returns the current setting
' NOTE: The default setting is IO_CLK_XODIV192, which outputs the CC1101's XO clock,
' divided by 192 on the pin.
' TI recommends the clock outputs be disabled when the radio is active, for best performance.
' Only one IO pin at a time can be configured as a clock output.
curr_mode := 0
readreg(core.IOCFG0, 1, @curr_mode)
case mode
$00..$0F, $16..$17, $1B..$1D, $24..$27, $29, $2B, $2E..$3F:
mode &= core.GDO0_CFG_BITS
mode := ((curr_mode & core.GDO0_CFG_MASK) | mode)
writereg(core.IOCFG0, 1, @mode)
other:
return curr_mode & core.GDO0_CFG_BITS
PUB gpio1(mode=-2): curr_mode
' Configure test signal output on GDO1 pin
' Valid values: $00..$0F, $16..$17, $1B..$1D, $24..$39, $41, $43, $46..$3F
' Any other value polls the chip and returns the current setting
' NOTE: This pin is shared with the SPI signal SO, and is valid only when CS is high.
' NOTE: The default setting is IO_HI_Z ($2E): Hi-Z/High-impedance/Tri-state
curr_mode := 0
readreg(core.IOCFG1, 1, @curr_mode)
case mode
$00..$0F, $16..$17, $1B..$1D, $24..$27, $29, $2B, $2E..$3F:
mode &= core.GDO1_CFG_BITS
mode := ((curr_mode & core.GDO1_CFG_MASK) | mode)
writereg(core.IOCFG1, 1, @mode)
other:
return curr_mode & core.GDO1_CFG_BITS
PUB gpio2(mode=-2): curr_mode
' Configure test signal output on GDO2 pin
' Valid values: $00..$0F, $16..$17, $1B..$1D, $24..$39, $41, $43, $46..$3F
' Any other value polls the chip and returns the current setting
' NOTE: The default setting is IO_CHIP_RDYn ($29)
curr_mode := 0
readreg(core.IOCFG2, 1, @curr_mode)
case mode
$00..$0F, $16..$17, $1B..$1D, $24..$27, $29, $2B, $2E..$3F:
mode &= core.GDO2_CFG_BITS
mode := ((curr_mode & core.GDO2_CFG_MASK) | mode)
writereg(core.IOCFG2, 1, @mode)
other:
return curr_mode & core.GDO2_CFG_BITS
PUB idle()
' Change chip state to IDLE
writereg(core.CS_SIDLE, 0, 0)
PUB interm_freq(freq=-2): curr_freq
' Intermediate Frequency (IF), in Hz
' Valid values: 25_390..787_109 (default: 380_859; rounded to the nearest value)
' Default value: 380_859
' Any other value polls the chip and returns the current setting
case freq
25_390..787_109:
freq := 1024 / (F_XOSC/freq)
writereg(core.FSCTRL1, 1, @freq)
other:
curr_freq := 0
readreg(core.FSCTRL1, 1, @curr_freq)
return curr_freq * (F_XOSC / 1024)
PUB last_crc_good(): flag
' Flag indicating CRC of last reception matched
' Returns: TRUE (-1) if comparison matched, FALSE (0) otherwise
readreg(core.LQI, 1, @flag)
return ((flag >> core.CRC_OK) & %1) == 1
PUB lna_gain(gain=-255): curr_gain
' Set maximum LNA+LNA2 gain (relative to maximum possible gain)
' Valid values:
' *0 - Maximum possible LNA+LNA2 gain
' -2 - ~2.6dBm below maximum
' -6 - ~6.1dBm below maximum
' -7 - ~7.4dBm below maximum
' -9 - ~9.2dBm below maximum
' -11 - ~11.5dBm below maximum
' -14 - ~14.6dBm below maximum
' -17 - ~17.1dBm below maximum
' Any other value polls the chip and returns the current setting
curr_gain := 0
readreg(core.AGCCTRL2, 1, @curr_gain)
case gain
0, -2, -6, -7, -9, -11, -14, -17:
gain := lookdownz(gain: 0, -2, -6, -7, -9, -11, -14, -17) << core.MAX_LNA_GAIN
gain := ((curr_gain & core.MAX_LNA_GAIN_MASK) | gain)
writereg(core.AGCCTRL2, 1, @gain)
other:
curr_gain := (curr_gain >> core.MAX_LNA_GAIN) & core.MAX_LNA_GAIN_BITS
return lookupz(curr_gain: 0, -2, -6, -7, -9, -11, -14, -17)
PUB magn_target(val=-2): curr_val
' Set target value for averaged amplitude from digital channel filter, in dB
' Valid values:
' 24, 27, 30, *33, 36, 38, 40, 42
' Any other value polls the chip and returns the current setting
curr_val := 0
readreg(core.AGCCTRL2, 1, @curr_val)
case val
24, 27, 30, 33, 36, 38, 40, 42:
val := lookdownz(val: 24, 27, 30, 33, 36, 38, 40, 42) & core.MAGN_TARGET_BITS
val := ((curr_val & core.MAGN_TARGET_MASK) | val)
writereg(core.AGCCTRL2, 1, @val)
other:
curr_val := curr_val & core.MAGN_TARGET_BITS
return lookupz(curr_val: 24, 27, 30, 33, 36, 38, 40, 42)
PUB manchest_enc_ena(mode=-2): curr_mode
' Enable Manchester encoding/decoding
' Valid values: TRUE (-1 or 1), *FALSE (0)
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.MDMCFG2, 1, @curr_mode)
case ||(mode)
0, 1:
mode := ||(mode) << core.MANCHST_EN
mode := ((curr_mode & core.MANCHST_EN_MASK) | mode)
writereg(core.MDMCFG2, 1, @mode)
other:
return ((curr_mode >> core.MANCHST_EN) & %1) == 1
PUB modulation(mode=-2): curr_mode
' Set modulation of transmitted (TX) or expected (RX) signal
' Valid values:
' *FSK2 (%000): 2-level or binary Frequency Shift-Keyed
' GFSK (%001): Gaussian FSK
' ASKOOK (%011): Amplitude Shift-Keyed or On Off-Keyed
' FSK4 (%100): 4-level FSK
' MSK (%111): Minimum Shift-Keyed
' Any other value polls the chip and returns the current setting
' NOTE: MSK supported only when data_rate() is greater than 26_000
curr_mode := 0
readreg(core.MDMCFG2, 1, @curr_mode)
case mode
FSK2, GFSK, ASKOOK, FSK4, MSK:
mode := mode << core.MOD_FORMAT
mode := ((curr_mode & core.MOD_FORMAT_MASK) | mode)
writereg(core.MDMCFG2, 1, @mode)
other:
return (curr_mode >> core.MOD_FORMAT) & core.MOD_FORMAT_BITS
PUB node_addr(addr=-2): curr_addr
' Set address used for packet filtration
' Valid values: $00..$FF (000-255)
' Default value: $00
' Any other value polls the chip and returns the current setting
' NOTE: $00 and $FF can be used as broadcast addresses.
case addr
$00..$FF:
addr &= core.ADDR_MASK
writereg(core.ADDR, 1, @addr)
other:
curr_addr := 0
readreg(core.ADDR, 1, @curr_addr)
return curr_addr
PUB pa_read(ptr_buff)
' Read PA table into ptr_buff
' NOTE: ptr_buff must be at least 8 bytes in length
readreg(core.PATABLE | core.BURST, 8, ptr_buff)
PUB part_num(): pn
' Part number of device
' Returns: $00
readreg(core.PARTNUM, 1, @pn)
PUB pa_write(ptr_buff)
' Write 8-byte PA table from ptr_buff
' NOTE: Table will be written starting at index 0 from the LSB of ptr_buff
writereg(core.PATABLE | core.BURST, 8, ptr_buff)
PUB payld_len(length=-2): curr_len
' Set payload length, when using fixed payload length mode,
' or maximum payload length when using variable payload length mode.
' Valid values: 1..*255
' Any other value polls the chip and returns the current setting
case length
1..255:
length &= core.PKTLEN_MASK
writereg(core.PKTLEN, 1, @length)
other:
curr_len := 0
readreg(core.PKTLEN, 1, @curr_len)
return curr_len & core.PKTLEN_MASK
PUB payld_len_cfg(mode=-2): curr_mode
' Set payload length mode
' Valid values:
' PKTLEN_FIXED (0): Fixed payload length mode. Payload length is set by payld_len()
' PKTLEN_VAR (1): Variable payload length mode. Payload length is set by first byte of
' payload data (default)
' PKTLEN_INF (2): Infinite payload length mode.
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.PKTCTRL0, 1, @curr_mode)
case mode
0..2:
mode := ((curr_mode & core.LEN_CFG_MASK) | mode)
writereg(core.PKTCTRL0, 1, @mode)
other:
return curr_mode & core.LEN_CFG_BITS
PUB payld_status_ena(mode=-2): curr_mode
' Append status bytes to packet payload (RSSI, LQI, CRC OK)
' Valid values:
' *TRUE (-1 or 1)
' FALSE (0)
' Any other value polls the chip and returns the current setting
curr_mode := 0
readreg(core.PKTCTRL1, 1, @curr_mode)
case ||(mode)
0, 1:
mode := ||(mode) << core.APPEND_STATUS
mode := ((curr_mode & core.APPEND_STATUS_MASK) | mode) & core.PKTCTRL1_MASK
writereg(core.PKTCTRL1, 1, @mode)
other:
return ((curr_mode >> core.APPEND_STATUS) & %1) == 1
PUB pll_locked(): flag
' Flag indicating PLL is locked
' Returns: TRUE (-1) if locked, FALSE otherwise
readreg(core.FSCAL1, 1, @flag)
return (flag <> $3F)
PUB preamble_len(len=-2): curr_len
' Set number of preamble bytes
' Valid values: 2, 3, *4, 6, 8, 12, 16, 24
' Any other value polls the chip and returns the current setting
curr_len := 0
readreg(core.MDMCFG1, 1, @curr_len)
case len
2, 3, 4, 6, 8, 12, 16, 24:
len := (lookdownz(len: 2, 3, 4, 6, 8, 12, 16, 24)) << core.NUM_PREAMBLE
len := ((curr_len & core.NUM_PREAMBLE_MASK) | len)
writereg(core.MDMCFG1, 1, @len)
other:
curr_len := (curr_len >> core.NUM_PREAMBLE) & core.NUM_PREAMBLE_BITS
return lookupz(curr_len: 2, 3, 4, 6, 8, 12, 16, 24)
PUB preamble_quality_thresh(thresh=-2): curr_thr
' Set Preamble quality estimator threshold
' Valid values: *0, 4, 8, 12, 16, 20, 24, 28
' NOTE: If 0, the sync word is always accepted.
' Any other value polls the chip and returns the current setting
curr_thr := 0
readreg(core.PKTCTRL1, 1, @curr_thr)
case thresh
0, 4, 8, 12, 16, 20, 24, 28:
thresh := lookdownz(thresh: 0, 4, 8, 12, 16, 20, 24, 28) << core.PQT
thresh := ((curr_thr & core.PQT_MASK) | thresh) & core.PKTCTRL1_MASK
writereg(core.PKTCTRL1, 1, @thresh)
other:
curr_thr := ((curr_thr >> core.PQT) & core.PQT_BITS)
return lookupz(curr_thr: 0, 4, 8, 12, 16, 20, 24, 28)
PUB reset()
' Reset the chip
writereg(core.CS_SRES, 0, 0)
time.msleep(5)
PUB rssi(): level
' Received Signal Strength Indicator
' Returns: Signal strength seen by transceiver, in dBm
level := 0
readreg(core.RSSI, 1, @level)
level := (~level / 2) - 74
PUB rx_bandwidth = rx_bw
PUB rx_bw(width=-2): curr_wid
' Set receiver channel filter bandwidth, in kHz
' Valid values: 812, 650, 541, 464, 406, 325, 270, 232, 203, 162, 135, 116, 102, 81, 68, 58
' (default: 203)
' Any other value polls the chip and returns the current setting
curr_wid := 0
readreg(core.MDMCFG4, 1, @curr_wid)
case width
812, 650, 541, 464, 406, 325, 270, 232, 203, 162, 135, 116, 102, 81, 68, 58:
width := (lookdown(width: 812, 650, 541, 464, 406, 325, 270, 232, 203, 162, 135, ...
116, 102, 81, 68, 58)-1) << core.CHANBW
width := ((curr_wid & core.CHANBW_MASK) | width)
writereg(core.MDMCFG4, 1, @width)
other:
curr_wid := ((curr_wid >> core.CHANBW) & core.CHANBW_BITS)+1
return lookup(curr_wid: 812, 650, 541, 464, 406, 325, 270, 232, 203, 162, 135, 116, ...
102, 81, 68, 58)
PUB rx_fifo_thresh(thresh=-2): curr_thr
' Set receive FIFO thresh, in bytes
' The threshold is exceeded when the number of bytes in the FIFO is greater
' than or equal to this value.
' Valid values: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64 (default: 32)
' Any other value polls the chip and returns the current setting
' NOTE: This affects the TX FIFO, inversely
curr_thr := 0
readreg(core.FIFOTHR, 1, @curr_thr)
case thresh
4..64:
thresh := (thresh / 4) - 1
thresh := ((curr_thr & core.FIFO_THR_MASK) | thresh) & core.FIFOTHR_MASK
writereg(core.FIFOTHR, 1, @thresh)
other:
return ((curr_thr & core.FIFO_THR_BITS) + 1) * 4
PUB rx_mode()
' Change chip state to RX (receive)
writereg(core.CS_SRX, 0, 0)
PUB rx_payld(nr_bytes, ptr_buff)
' Read data queued in the RX FIFO
' nr_bytes Valid values: 1..64
' Any other value is ignored
' NOTE: Ensure buffer at address ptr_buff is at least as big as the number of bytes you're reading
readreg(core.FIFO, nr_bytes, ptr_buff)
PUB sleep()
' Power down chip
writereg(core.CS_SPWD, 0, 0)