-
Notifications
You must be signed in to change notification settings - Fork 1
/
sx1276.lua
624 lines (551 loc) · 15.1 KB
/
sx1276.lua
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
-- Ehanced by Jakub Mazurek @jayu in 2021
-- The MIT License (MIT)
--
-- Copyright (c) 2016 Jaap Braam
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in all
-- copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-- SOFTWARE.
--
-- Author: Jaap Braam
REG_FIFO = 0x00
REG_OP_MODE = 0x01
REG_FRF_MSB = 0x06
REG_FRF_MID = 0x07
REG_FRF_LSB = 0x08
REG_PA_CONFIG = 0x09
REG_OCP = 0x0b
REG_LNA = 0x0c
REG_FIFO_ADDR_PTR = 0x0d
REG_FIFO_TX_BASE_ADDR = 0x0e
REG_FIFO_RX_BASE_ADDR = 0x0f
REG_FIFO_RX_CURRENT_ADDR = 0x10
REG_IRQ_FLAGS = 0x12
REG_RX_NB_BYTES = 0x13
REG_PKT_SNR_VALUE = 0x19
REG_PKT_RSSI_VALUE = 0x1a
REG_RSSI_VALUE = 0x1b
REG_MODEM_CONFIG_1 = 0x1d
REG_MODEM_CONFIG_2 = 0x1e
REG_PREAMBLE_MSB = 0x20
REG_PREAMBLE_LSB = 0x21
REG_PAYLOAD_LENGTH = 0x22
REG_MODEM_CONFIG_3 = 0x26
REG_FREQ_ERROR_MSB = 0x28
REG_FREQ_ERROR_MID = 0x29
REG_FREQ_ERROR_LSB = 0x2a
REG_RSSI_WIDEBAND = 0x2c
REG_DETECTION_OPTIMIZE = 0x31
REG_INVERTIQ = 0x33
REG_DETECTION_THRESHOLD = 0x37
REG_SYNC_WORD = 0x39
REG_INVERTIQ2 = 0x3b
REG_DIO_MAPPING_1 = 0x40
REG_VERSION = 0x42
REG_PA_DAC = 0x4d
-- modes
MODE_LONG_RANGE_MODE = 0x80
MODE_SLEEP = 0x00
MODE_STDBY = 0x01
MODE_TX = 0x03
MODE_RX_CONTINUOUS = 0x05
MODE_RX_SINGLE = 0x06
-- PA config
PA_BOOST = 0x80
-- IRQ masks
IRQ_TX_DONE_MASK = 0x08
IRQ_PAYLOAD_CRC_ERROR_MASK = 0x20
IRQ_RX_DONE_MASK = 0x40
RF_MID_BAND_THRESHOLD = 525E6
RSSI_OFFSET_HF_PORT = 157
RSSI_OFFSET_LF_PORT = 164
MAX_PKT_LENGTH = 255
local now = tmr.now
local gpiowrite = gpio.write
local spisend = spi.send
local spirecv = spi.recv
local bor = bit.bor
local band = bit.band
local bnot = bit.bnot
local delay = tmr.delay
local byte = string.byte
local rtcepoch2cal = rtctime.epoch2cal
local rtcget = rtctime.get
local function padBase64(s)
local p = 4 - (#s % 4)
return s .. string.rep("=", p % 4)
end
local MC1 = {
BW125 = 0x70,
BW250 = 0x80,
BW500 = 0x90,
BW150 = 0x00
}
MC1["4/5"] = 0x02
MC1["4/6"] = 0x04
MC1["4/7"] = 0x06
MC1["4/8"] = 0x08
local MC2 = {
FSK = 0x00,
SF6 = 0x60,
SF7 = 0x70,
SF8 = 0x80,
SF9 = 0x90,
SF10 = 0xA0,
SF11 = 0xB0,
SF12 = 0xC0
}
local function getName(table, value, mask)
for k, v in pairs(table) do
if bit.band(value, mask) == v then
return k
end
end
return "?"
end
local M = {
rxnb = 0,
rxok = 0,
rxto = 0,
txnb = 0
}
local _nss = 0
local _dio0 = 1
local _dio1 = 2
local _freq = 868100000
local _sf = MC2.SF7
local _bw = MC1.BW125
local _cr = "4/5"
local _scanner = function()
print("no scanner active")
end
local function read(addr)
gpiowrite(_nss, 0)
spisend(1, addr)
local b = spirecv(1, 1)
gpiowrite(_nss, 1)
return byte(b)
end
local function readBuffer(addr, len)
gpiowrite(_nss, 0)
spisend(1, addr)
local buf = spirecv(1, len)
gpiowrite(_nss, 1)
return buf
end
local function write(addr, value)
gpiowrite(_nss, 0)
spisend(1, addr + 0x80, value)
gpiowrite(_nss, 1)
end
local function idle()
write(REG_OP_MODE, bor(MODE_LONG_RANGE_MODE, MODE_STDBY))
end
local function pktData()
-- local FIFO_RX_CURRENT_ADDR=0x10
-- local RX_NB_BYTES=0x13
-- local FIFO_ADDR_PTR=0x0D
-- local FIFO=0x00
local curr = read(0x10)
local count = read(0x13)
write(0x0D, curr)
return readBuffer(0x00, count) or ""
end
local tmst = 0
local function rxDone()
-- local IRQ_FLAGS=0x12
-- local RxDone=0x40
-- local tmst=now()
local pkt = {}
pkt.tmst = tmst
-- clear rxDone
write(0x12, 0x40)
-- message counter
M.rxnb = M.rxnb + 1
-- CRC
local irqflags = read(0x12)
if band(irqflags, 0x20) == 0x20 then
write(0x12, 0x20)
pkt.stat = -1
else
local rhc = read(0x1C)
if band(rhc, 0x40) == 0x40 then
pkt.stat = 1
else
pkt.stat = 0
end
end
if pkt.stat ~= -1 then
local hopch = read(0x1C)
pkt.chan = band(hopch, 0x1F) -- pktChan()
pkt.rfch = 1
pkt.modu = "LORA"
local freq = (125000 * read(0x08) / 2 ^ 11) + (125000 * read(0x07) / 2 ^ 3) + (125000 * read(0x06) * 2 ^ 5) -- pktFreq() -- in Hz
pkt.freq = string.format("%0d.%03d", freq / 1000000, ((freq + 500) / 1000) % 1000)
local rssi = read(0x1A)
pkt.rssi = -157 + rssi
-- pktRssi()
local snr = read(0x19)
if snr > 127 then
snr = -(band(bnot(snr), 0xFF) + 1)
end
pkt.lsnr = snr / 4 -- pktLsnr()
local mc1 = read(0x1D)
local mc2 = read(0x1E)
pkt.datr = getName(MC2, mc2, 0xF0) .. getName(MC1, mc1, 0xF0) -- pktDatr()
pkt.codr = getName(MC1, mc1, 0x0E) -- pktCodr()
pkt.data = pktData()
pkt.size = #pkt.data
-- message ok counter
M.rxok = M.rxok + 1
-- callback
M.rxpk(pkt)
end
end
local function setFreq(freqHz)
-- local FRF_MSB=0x06
-- local FRF_MID=0x07
-- local FRF_LSB=0x08
-- keep resolution for integer version
-- frf = (freqHz*2^19)/32000000
-- frf = (freqHz*2^14)/1000000
-- frf = (freqHz/1000*2^14)/1000
-- frf = (freqHz/1000*2^11)/125
local frf = (freqHz / 1000 * 2 ^ 11) / 125
local frfMsb = frf / 2 ^ 16
local frfMid = frf / 2 ^ 8 % 256
local frfLsb = frf % 256
write(0x06, frfMsb)
write(0x07, frfMid)
write(0x08, frfLsb)
-- print(string.format("%0d.%06d Mhz %02X %02X %02X ",freqHz/1000000,freqHz%1000000,frfMsb,frfMid,frfLsb))
end
local function old_setPower(power)
local pac
if power > 17 then
pac = 0x8F -- 17dbm
elseif power < -3 then
pac = 0x20 -- -3dbm
elseif power <= 12 then
pac = 0x20 + power + 3 -- -3dbm .. 12dbm
else
pac = 0x80 + power - 2 -- 13dbm .. 16dbm
end
write(REG_PA_CONFIG, pac)
end
local function setOCP(mA)
local ocpTrim = 27
if (mA <= 120) then
ocpTrim = (mA - 45) / 5
elseif (mA <= 240) then
ocpTrim = (mA + 30) / 10
end
write(REG_OCP, bor(0x20, band(0x1F, ocpTrim)))
end
local function setPower(level)
-- PA BOOST
if (level > 17) then
if (level > 20) then
level = 20
end
-- subtract 3 from level, so 18 - 20 maps to 15 - 17
level = level - 3
-- High Power +20 dBm Operation (Semtech SX1276/77/78/79 5.4.3.)
write(REG_PA_DAC, 0x87)
setOCP(140)
else
if (level < 2) then
level = 2
end
-- Default value PA_HF/LF or +17dBm
write(REG_PA_DAC, 0x84)
setOCP(100)
end
write(REG_PA_CONFIG, bor(PA_BOOST, (level - 2)))
end
local function setRate(sf, bw, cr, crc, iiq, power)
-- local SF10=0xA0
-- local SF11=0xB0
-- local SF12=0xC0
-- local PA_CONFIG=0x09
-- local MODEM_CONFIG1=0x1D
-- local MODEM_CONFIG2=0x1E
-- local MODEM_CONFIG3=0x26
-- local SYMB_TIMEOUT_LSB=0x1F
-- local INVERT_IQ=0x33
local mc1 = bor(bw, cr)
local mc2 = bor(sf, crc)
-- local mc3=0x04
local mc3 = 0x00 -- no AGC
if (sf == 0xB0 or sf == 0xC0) then
mc3 = 0x08
end -- MC2.SF11=0xB0, MC2.SF12=0xC0
local stl = 0x08
if (sf == 0xA0 or sf == 0xB0 or sf == 0xC0) then
stl = 0x05
end
setPower(power)
write(0x1D, mc1)
write(0x1E, mc2)
write(0x26, mc3)
write(0x1F, stl)
write(0x33, iiq)
end
local function setChannel(freq, sf, cr)
-- local HOP_PERIOD=0x24
-- local FIFO_ADDR_PTR=0x0D
-- local FIFO_RX_BASE_AD=0x0F
-- local CR4_5=0x02
-- local CRC_ON=0x04
if (cr == nil) then
cr = "4/5"
end
setFreq(freq)
setRate(sf, _bw, MC1[cr], 0x04, 0x27, 14) -- CR4/5=0x02, CRC_ON=0x04
write(0x24, 0x00)
write(0x0D, read(0x0F))
end
function M.setChannel(freq, sf, cr)
_freq = freq
_sf = MC2[sf]
_cr = cr
setChannel(_freq, _sf, _cr)
end
local function txBuffer(data)
-- local FIFO_ADDR_PTR=0x0D
-- local FIFO_TX_BASE_AD=0x0E
-- local PAYLOAD_LENGTH=0x22
-- local FIFO=0x00
write(0x0D, read(0x0E))
write(0x22, #data)
write(0x00, data)
end
local state = 0
local cadSF = 0
local function transmitPkt(freq, sf, bw, cr, crc, iiq, powe, data)
print("Transmit pkt")
state = 3 -- tx
-- PREPARATION TO SEND
idle()
setFreq(freq)
setRate(sf, bw, cr, crc, iiq, powe)
-- reset FIFO address and paload length
write(REG_FIFO_TX_BASE_ADDR, 0)
write(REG_FIFO_ADDR_PTR, 0)
write(REG_PAYLOAD_LENGTH, 0)
write(REG_FIFO, data)
write(REG_PAYLOAD_LENGTH, #data)
write(REG_DIO_MAPPING_1, 0x40) -- DIO_MAPPING_1=0x40
gpio.mode(_dio0, gpio.INT)
gpio.trig(
_dio0,
"up",
function()
-- clear TxDone
write(REG_IRQ_FLAGS, 0xFF)
print("TxDone", node.heap())
idle()
_scanner()
end
)
write(REG_OP_MODE, bor(MODE_LONG_RANGE_MODE, MODE_TX))
M.txnb = M.txnb + 1
end
local function dio1handler()
-- local IRQ_FLAGS=0x12
-- local DIO_MAPPING_1=0x40
if state == 0 or state == 1 then -- CAD_DETECTED
write(0x01, 0x86) -- RX_SINGLE
write(0x12, 0xFF) -- clear interrupt flags
state = 2
write(0x40, 0x03) -- DIO0 RxDone, DIO1 RxTimeout, DIO3 None
delay(256)
local rssi = read(0x1B)
if rssi < 40 then
_scanner()
end
elseif state == 2 then -- RX_TIMEOUT
local rssi = read(0x1B)
M.rxto = M.rxto + 1
_scanner()
end
end
local function dio0handler()
-- local OP_MODE=0x01
-- local IRQ_FLAGS=0x12
-- local MODEM_CONFIG3=0x26
-- local DIO_MAPPING_1=0x40
-- local OPMODE_CAD=0x07
tmst = now()
-- CadDone
if state == 1 then
if cadSF < 0xC0 then -- try next SF
cadSF = cadSF + 0x10 -- next SF
write(0x1E, cadSF) -- set next SF
if cadSF == 0xB4 then
write(0x26, 0x0C) -- ModemConfig3: LowDataRateOptimize on
end
if cadSF == 0xA4 then
write(0x1F, 0x05) -- RegSymbolTimeoutLSB: SymbolTimeout 5
end
write(0x01, 0x87) -- set mode LoRa CAD
write(0x12, 0xFF) -- clear interrupt flags
delay(256)
local rssi = read(0x1B)
if rssi < 40 then
_scanner()
end
else
_scanner() -- restart scanner
end
elseif state == 0 then
write(0x01, 0x87) -- set mode LoRa CAD
write(0x12, 0xFF) -- clear interrupt flags
delay(256)
local rssi = read(0x1B)
if rssi > 42 then
state = 1 -- CAD
else
-- hop()
end
elseif state == 2 then
local flags = read(0x12)
if band(flags, 0x40) == 0x40 then
-- RxDone
rxDone() -- handle message received
_scanner() -- restart scanner
end
end
end
local function allSf()
-- local RegOpMode=0x01
-- local OPMODE_SLEEP=0x00
-- local OPMODE_RX=0x05
-- local DIO_MAPPING_1=0x40
write(0x01, 0x81) -- set mode LoRa standby
write(0x39, 0x34) -- syncword LoRaWan
setChannel(_freq, _sf, _cr) -- channel settings in LoRa mode
cadSF = _sf + 0x04 -- reset SF hopper
gpio.mode(_dio0, gpio.INT)
gpio.trig(_dio0, "up", dio0handler)
gpio.mode(_dio1, gpio.INT)
gpio.trig(_dio1, "up", dio1handler)
write(0x40, 0xA3) -- DIO0 CadDone, DIO1 None, DIO3 None
-- start
write(0x01, 0x87) -- set mode LoRa CAD
state = 0 -- RSSI detect
write(0x12, 0xFF) -- clear interrupt flags
delay(256)
local rssi = read(0x1B)
if rssi > 42 then
state = 1 -- CAD
end
end
local function singleSf()
write(0x01, 0x81) -- set mode LoRa standby
write(0x39, 0x34) -- syncword LoRaWan
setChannel(_freq, _sf, _cr) -- channel settings in LoRa mode
gpio.mode(_dio0, gpio.INT)
gpio.trig(
_dio0,
"up",
function()
tmst = now()
rxDone()
print("RX done", node.heap())
write(0x12, 0xFF) -- clear interrupt flags
end
)
write(0x40, 0x03) -- DIO0 RxDone, DIO1 RxTimeout, DIO3 None
write(0x01, 0x85) -- set mode LoRa rxContinuous
end
function M.rxpk(pkg)
end
local txTimer = tmr.create()
function M.txpk(pkt)
print("M.txpk")
local freq = pkt.freq
local sf = MC2[pkt.datr:sub(1, -6)]
local bw = MC1[pkt.datr:sub(-5)]
local cr = MC1[pkt.codr]
-- local crc = 0x00 -- crc disabled...
local crc = 0x04 -- crc enabled...
local iiq = 0x27
if pkt.ipol == true then
iiq = 0x40
end
local powe = pkt.powe
local data = pkt.data
local size = string.len(pkt.data)
-- encoder.fromBase64(padBase64(pkt.data)):sub(1, size)
-- trigger transmitPkt 30ms before the message has to be sent.
-- a large margin is necessary because the ESP's timing is 'not so precise'
transmitPkt(freq, sf, bw, cr, crc, iiq, powe, data, size)
end
local function sxInit()
-- local VERSION=0x42
-- local OPMODE_SLEEP=0x00
-- local SYNC_WORD=0x39
-- local LNA=0x0C
-- local MAX_PAYLOAD_LENGTH=0x23
-- local PAYLOAD_LENGTH=0x22
-- local PREAMBLE_LSB=0x21
-- local PA_RAMP=0x0A
-- local PA_DAC=0x5A
-- local LNA_MAX_GAIN=0x23
local version = read(0x42)
if (version ~= 0x12) then
print("Unknown radio: ", version)
end
print("version", version)
write(0x01, 0x80)
write(0x39, 0x34)
write(0x0C, 0x23)
write(0x22, 0x40)
write(0x21, 0x08)
write(0x0A, bor(band(read(0x0A), 0xF0), 0x08)) -- set PA ramp-up time 50 uSec
write(0x5A, bor(read(0x5A), 0x04))
write(0x37, 0x0A) -- detection threshold
end
local function init(nss, dio0, dio1, freq, sf, bw, cr)
--
node.setcpufreq(node.CPU160MHZ)
-- setup SPI
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 3)
_nss = nss
gpio.mode(_nss, gpio.OUTPUT)
-- init radio
sxInit()
-- setup handlers
_dio0 = dio0
_dio1 = dio1
_freq = freq
_cr = cr
_bw = MC1[bw]
if (sf == "ALL") then
_sf = MC2["SF7"]
_scanner = allSf
print("start allSF detector")
else
_sf = MC2[sf]
_scanner = singleSf
print("start singleSF detector on", sf)
end
_scanner()
return M
end
return init