lora_line_repeater - repeat message down a chain, adding to the payloa…

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wayne roberts / Mbed OS lora_line_repeater

repeat message down a chain, adding to the payload at each repeating device

radio chip selection

Radio chip driver is not included, because options are available.
If you're using SX1272 or SX1276, then import sx127x driver into your program.
if you're using SX1261 or SX1262, then import sx126x driver into your program.
if you're using SX1280, then import sx1280 driver into your program.
If you're using NAmote72 or Murata discovery, then you must import only sx127x driver.

/media/uploads/dudmuck/chain.png

network architecture

UNIT 0x00 transmitting only device: mandatory.
UNIT 0x01: repeating device
Uni-directional network: Each unit can only receive message from UNIT_ID - 1 (previous unit)
UINT n receiving only device LAST_UNIT: mandatory; prints payload onto UART.

configuration

Each device in the network is uniquely identified by:

UNIT_ID: ID byte designating address of this device.
UNIT_LAST: If defined, this device prints payload onto serial port instead of re-transmitting payload.

All devices in network must be configured identically with the following:

TX_INTERVAL_US: how often to take measurement and send to UNIT_ID+1 (time of complete cycle).
MAX_TX_LENGTH: Maximum size of payload, in bytes. Payload is sent in fragments when exceeds this value; aka size of each fragment.
TXRX_PADDING_US : Time allotted for RX-TX turnaround and CPU overhead
MAX_TX_ATTEMPTS: Count of transmit retries permitted
SPREADING_FACTOR LoRa configuration of datarate
CF_MHZ : Operating radio frequency

Duration of retry interval is auto-calculated from LoRa modem configuration (bandwidth/sf) and MAX_TX_LENGTH.
Take care that TX_INTERVAL_US value is appropriate relative to total retry interval (interval * MAX_TX_ATTEMPTS)

main.cpp@0:d88677306896, 2018-06-13 (annotated)

Committer:: Wayne Roberts
Date:: Wed Jun 13 17:49:58 2018 -0700
Revision:: 0:d88677306896
Child:: 1:7dbf0926e146

initial commit

Who changed what in which revision?

User	Revision	Line number	New contents of line
Wayne Roberts	0:d88677306896	1	#include "radio.h"
Wayne Roberts	0:d88677306896	2
Wayne Roberts	0:d88677306896	3	#define UNIT_ID 0x01 /* 0x00: first unit */
Wayne Roberts	0:d88677306896	4	//#define UNIT_LAST
Wayne Roberts	0:d88677306896	5
Wayne Roberts	0:d88677306896	6	// test large sample, large pkt size #define N_SMP 10
Wayne Roberts	0:d88677306896	7	typedef struct __attribute__((__packed__)) msg {
Wayne Roberts	0:d88677306896	8	uint8_t unit_id;
Wayne Roberts	0:d88677306896	9	uint8_t flags;
Wayne Roberts	0:d88677306896	10	uint16_t sample;
Wayne Roberts	0:d88677306896	11
Wayne Roberts	0:d88677306896	12	#ifdef N_SMP
Wayne Roberts	0:d88677306896	13	uint16_t samples[N_SMP];
Wayne Roberts	0:d88677306896	14	#endif
Wayne Roberts	0:d88677306896	15	} message_t;
Wayne Roberts	0:d88677306896	16
Wayne Roberts	0:d88677306896	17	#define TX_INTERVAL_US 5000000
Wayne Roberts	0:d88677306896	18	#define MAX_TX_LENGTH 64
Wayne Roberts	0:d88677306896	19	#define TXRX_PADDING_US 10000
Wayne Roberts	0:d88677306896	20	#define MAX_TX_ATTEMPTS 4
Wayne Roberts	0:d88677306896	21	#define SPREADING_FACTOR 9
Wayne Roberts	0:d88677306896	22	#define CF_MHZ 917.6
Wayne Roberts	0:d88677306896	23
Wayne Roberts	0:d88677306896	24	#define EXPECTED_LENGTH (UNIT_ID * sizeof(message_t))
Wayne Roberts	0:d88677306896	25	//#define MEASURED_MAX_ERR (TX_INTERVAL_US / 4000) // +/-100ppm allowance
Wayne Roberts	0:d88677306896	26	#define MEASURED_MAX_ERR (TX_INTERVAL_US / 300) // +/-Xppm allowance
Wayne Roberts	0:d88677306896	27
Wayne Roberts	0:d88677306896	28	#if defined(SX127x_H)
Wayne Roberts	0:d88677306896	29	#define RX_STARTUP_US 1500
Wayne Roberts	0:d88677306896	30	#elif defined(SX126x_H)
Wayne Roberts	0:d88677306896	31	#define RX_STARTUP_US 1000
Wayne Roberts	0:d88677306896	32	#endif
Wayne Roberts	0:d88677306896	33	unsigned rxStartup_us = RX_STARTUP_US;
Wayne Roberts	0:d88677306896	34
Wayne Roberts	0:d88677306896	35	RawSerial pc(USBTX, USBRX);
Wayne Roberts	0:d88677306896	36
Wayne Roberts	0:d88677306896	37	#ifdef TARGET_DISCO_L072CZ_LRWAN1
Wayne Roberts	0:d88677306896	38	AnalogIn ain(A0);
Wayne Roberts	0:d88677306896	39	#else
Wayne Roberts	0:d88677306896	40	#ifdef TARGET_FF_MORPHO
Wayne Roberts	0:d88677306896	41	AnalogIn ain(PC_4); // pin unused by arduino shields
Wayne Roberts	0:d88677306896	42	#endif /* TARGET_FF_MORPHO */
Wayne Roberts	0:d88677306896	43	#endif /* !TARGET_DISCO_L072CZ_LRWAN1 */
Wayne Roberts	0:d88677306896	44
Wayne Roberts	0:d88677306896	45	uint8_t forward[255];
Wayne Roberts	0:d88677306896	46	uint8_t forwardLen;
Wayne Roberts	0:d88677306896	47	uint8_t forwardLenTransmitted;
Wayne Roberts	0:d88677306896	48	uint8_t forwardLenAckd;
Wayne Roberts	0:d88677306896	49	int prevFrag;
Wayne Roberts	0:d88677306896	50	volatile us_timestamp_t forwardedAt;
Wayne Roberts	0:d88677306896	51
Wayne Roberts	0:d88677306896	52	volatile us_timestamp_t lastRxIrqAt;
Wayne Roberts	0:d88677306896	53	volatile us_timestamp_t measuredInterval, measuredIntervalSaved;
Wayne Roberts	0:d88677306896	54
Wayne Roberts	0:d88677306896	55
Wayne Roberts	0:d88677306896	56	enum _state_ {
Wayne Roberts	0:d88677306896	57	/* 0 */ STATE_NONE = 0,
Wayne Roberts	0:d88677306896	58	/* 1 */ STATE_GET_REQ,
Wayne Roberts	0:d88677306896	59	#ifndef UNIT_LAST
Wayne Roberts	0:d88677306896	60	/* 2 */ STATE_ACK_WAITING,
Wayne Roberts	0:d88677306896	61	/* 3 */ STATE_TX_FORWARD,
Wayne Roberts	0:d88677306896	62	#endif /* UNIT_LAST */
Wayne Roberts	0:d88677306896	63	} state;
Wayne Roberts	0:d88677306896	64
Wayne Roberts	0:d88677306896	65	void stateToString(enum _state_ s, char* out)
Wayne Roberts	0:d88677306896	66	{
Wayne Roberts	0:d88677306896	67	const char* str;
Wayne Roberts	0:d88677306896	68
Wayne Roberts	0:d88677306896	69	switch (s) {
Wayne Roberts	0:d88677306896	70	case STATE_NONE: str = "NONE"; break;
Wayne Roberts	0:d88677306896	71	case STATE_GET_REQ: str = "GET_REQ"; break;
Wayne Roberts	0:d88677306896	72	#ifndef UNIT_LAST
Wayne Roberts	0:d88677306896	73	case STATE_ACK_WAITING: str = "ACK_WAITING"; break;
Wayne Roberts	0:d88677306896	74	case STATE_TX_FORWARD: str = "TX_FORWARD"; break;
Wayne Roberts	0:d88677306896	75	#endif /* UNIT_LAST */
Wayne Roberts	0:d88677306896	76	default:
Wayne Roberts	0:d88677306896	77	sprintf(out, "??%u??", s);
Wayne Roberts	0:d88677306896	78	return;
Wayne Roberts	0:d88677306896	79	}
Wayne Roberts	0:d88677306896	80
Wayne Roberts	0:d88677306896	81	strcpy(out, str);
Wayne Roberts	0:d88677306896	82	}
Wayne Roberts	0:d88677306896	83
Wayne Roberts	0:d88677306896	84	typedef union {
Wayne Roberts	0:d88677306896	85	struct {
Wayne Roberts	0:d88677306896	86	uint8_t attempt : 3; // 0,1,2
Wayne Roberts	0:d88677306896	87	uint8_t fragNum : 4; // 3,4,5,6
Wayne Roberts	0:d88677306896	88	uint8_t fragLast : 1; // 7
Wayne Roberts	0:d88677306896	89	} bits;
Wayne Roberts	0:d88677306896	90	uint8_t octet;
Wayne Roberts	0:d88677306896	91	} pkt_flags_t;
Wayne Roberts	0:d88677306896	92
Wayne Roberts	0:d88677306896	93	volatile struct _f_ {
Wayne Roberts	0:d88677306896	94	uint8_t _sleep_ : 1; // 0
Wayne Roberts	0:d88677306896	95	uint8_t mbedTImeout_forwarderStarted: 1; // 1
Wayne Roberts	0:d88677306896	96	uint8_t run : 1; // 2
Wayne Roberts	0:d88677306896	97	} flags;
Wayne Roberts	0:d88677306896	98
Wayne Roberts	0:d88677306896	99
Wayne Roberts	0:d88677306896	100	static uint16_t crc16( uint8_t *buffer, uint16_t length )
Wayne Roberts	0:d88677306896	101	{
Wayne Roberts	0:d88677306896	102	uint16_t i;
Wayne Roberts	0:d88677306896	103	// The CRC calculation follows CCITT
Wayne Roberts	0:d88677306896	104	const uint16_t polynom = 0x1021;
Wayne Roberts	0:d88677306896	105	// CRC initial value
Wayne Roberts	0:d88677306896	106	uint16_t crc = 0x0000;
Wayne Roberts	0:d88677306896	107
Wayne Roberts	0:d88677306896	108	if( buffer == NULL )
Wayne Roberts	0:d88677306896	109	{
Wayne Roberts	0:d88677306896	110	return 0;
Wayne Roberts	0:d88677306896	111	}
Wayne Roberts	0:d88677306896	112
Wayne Roberts	0:d88677306896	113	for( i = 0; i < length; ++i )
Wayne Roberts	0:d88677306896	114	{
Wayne Roberts	0:d88677306896	115	uint16_t j;
Wayne Roberts	0:d88677306896	116	crc ^= ( uint16_t ) buffer[i] << 8;
Wayne Roberts	0:d88677306896	117	for( j = 0; j < 8; ++j )
Wayne Roberts	0:d88677306896	118	{
Wayne Roberts	0:d88677306896	119	crc = ( crc & 0x8000 ) ? ( crc << 1 ) ^ polynom : ( crc << 1 );
Wayne Roberts	0:d88677306896	120	}
Wayne Roberts	0:d88677306896	121	}
Wayne Roberts	0:d88677306896	122
Wayne Roberts	0:d88677306896	123	return crc;
Wayne Roberts	0:d88677306896	124	}
Wayne Roberts	0:d88677306896	125
Wayne Roberts	0:d88677306896	126	#ifdef UNIT_LAST
Wayne Roberts	0:d88677306896	127	void print_payload()
Wayne Roberts	0:d88677306896	128	{
Wayne Roberts	0:d88677306896	129	unsigned n;
Wayne Roberts	0:d88677306896	130
Wayne Roberts	0:d88677306896	131	for (n = 0; n < forwardLen; n += sizeof(message_t)) {
Wayne Roberts	0:d88677306896	132	const message_t* m = (message_t*)&forward[n];
Wayne Roberts	0:d88677306896	133
Wayne Roberts	0:d88677306896	134	pc.printf("unit %02x: %02x, %u\r\n", m->unit_id, m->flags, m->sample);
Wayne Roberts	0:d88677306896	135	}
Wayne Roberts	0:d88677306896	136
Wayne Roberts	0:d88677306896	137	}
Wayne Roberts	0:d88677306896	138	#endif /* UNIT_LAST */
Wayne Roberts	0:d88677306896	139
Wayne Roberts	0:d88677306896	140	LowPowerTimeout mbedTimeout_nextRx;
Wayne Roberts	0:d88677306896	141	volatile unsigned retryInterval_us;
Wayne Roberts	0:d88677306896	142	volatile us_timestamp_t rxStartAt;
Wayne Roberts	0:d88677306896	143
Wayne Roberts	0:d88677306896	144
Wayne Roberts	0:d88677306896	145	void setupNext()
Wayne Roberts	0:d88677306896	146	{
Wayne Roberts	0:d88677306896	147	state = STATE_GET_REQ;
Wayne Roberts	0:d88677306896	148	forwardLen = 0;
Wayne Roberts	0:d88677306896	149	prevFrag = -1;
Wayne Roberts	0:d88677306896	150	pc.printf("->GET_REQ ");
Wayne Roberts	0:d88677306896	151	if (measuredInterval > 0) {
Wayne Roberts	0:d88677306896	152	flags._sleep_ = 1;
Wayne Roberts	0:d88677306896	153	Radio::Sleep();
Wayne Roberts	0:d88677306896	154	pc.printf("SLEEP mi:%llu ", measuredInterval);
Wayne Roberts	0:d88677306896	155	measuredInterval = 0; // single use
Wayne Roberts	0:d88677306896	156	} else {
Wayne Roberts	0:d88677306896	157	flags._sleep_ = 0;
Wayne Roberts	0:d88677306896	158	Radio::Rx();
Wayne Roberts	0:d88677306896	159
Wayne Roberts	0:d88677306896	160	rxStartAt = 0; // starting of continuous rx not used
Wayne Roberts	0:d88677306896	161
Wayne Roberts	0:d88677306896	162	pc.printf("RX ");
Wayne Roberts	0:d88677306896	163	}
Wayne Roberts	0:d88677306896	164
Wayne Roberts	0:d88677306896	165	memset(forward, 0xff, EXPECTED_LENGTH);
Wayne Roberts	0:d88677306896	166	}
Wayne Roberts	0:d88677306896	167
Wayne Roberts	0:d88677306896	168	LowPowerTimeout mbedTImeout_forwarder;
Wayne Roberts	0:d88677306896	169
Wayne Roberts	0:d88677306896	170	#ifndef UNIT_LAST
Wayne Roberts	0:d88677306896	171	volatile uint8_t txCurs;
Wayne Roberts	0:d88677306896	172
Wayne Roberts	0:d88677306896	173	LowPowerTicker tickerRetry;
Wayne Roberts	0:d88677306896	174
Wayne Roberts	0:d88677306896	175	void retry_cb()
Wayne Roberts	0:d88677306896	176	{
Wayne Roberts	0:d88677306896	177	unsigned c;
Wayne Roberts	0:d88677306896	178	pkt_flags_t f;
Wayne Roberts	0:d88677306896	179
Wayne Roberts	0:d88677306896	180	f.octet = Radio::radio.tx_buf[1];
Wayne Roberts	0:d88677306896	181	pc.printf("attempt%u", f.bits.attempt);
Wayne Roberts	0:d88677306896	182	if (++f.bits.attempt >= MAX_TX_ATTEMPTS) {
Wayne Roberts	0:d88677306896	183	pc.printf(" lastTry");
Wayne Roberts	0:d88677306896	184	tickerRetry.detach();
Wayne Roberts	0:d88677306896	185	#if (UNIT_ID != 0x00)
Wayne Roberts	0:d88677306896	186	setupNext();
Wayne Roberts	0:d88677306896	187	#endif /* UNIT_ID != 0x00 */
Wayne Roberts	0:d88677306896	188	pc.printf("\r\n");
Wayne Roberts	0:d88677306896	189	return;
Wayne Roberts	0:d88677306896	190	}
Wayne Roberts	0:d88677306896	191	pc.printf("->%u\r\n", f.bits.attempt);
Wayne Roberts	0:d88677306896	192	Radio::radio.tx_buf[1] = f.octet;
Wayne Roberts	0:d88677306896	193
Wayne Roberts	0:d88677306896	194	c = crc16(Radio::radio.tx_buf, txCurs-2);
Wayne Roberts	0:d88677306896	195	Radio::radio.tx_buf[txCurs-2] = c >> 8;
Wayne Roberts	0:d88677306896	196	Radio::radio.tx_buf[txCurs-1] = c;
Wayne Roberts	0:d88677306896	197
Wayne Roberts	0:d88677306896	198	Radio::Send(txCurs, 0, 0, 0);
Wayne Roberts	0:d88677306896	199	state = STATE_ACK_WAITING;
Wayne Roberts	0:d88677306896	200	}
Wayne Roberts	0:d88677306896	201
Wayne Roberts	0:d88677306896	202	uint8_t _tx_forward()
Wayne Roberts	0:d88677306896	203	{
Wayne Roberts	0:d88677306896	204	unsigned fwdLen;
Wayne Roberts	0:d88677306896	205	unsigned c;
Wayne Roberts	0:d88677306896	206	uint8_t added, avail, toSendLen, stop = MAX_TX_LENGTH-2;
Wayne Roberts	0:d88677306896	207	pkt_flags_t f;
Wayne Roberts	0:d88677306896	208
Wayne Roberts	0:d88677306896	209	tickerRetry.attach_us(retry_cb, retryInterval_us);
Wayne Roberts	0:d88677306896	210
Wayne Roberts	0:d88677306896	211	if (forwardLen < EXPECTED_LENGTH) {
Wayne Roberts	0:d88677306896	212	pc.printf("\e[31mmissing %u bytes\e[0m ", EXPECTED_LENGTH - forwardLen);
Wayne Roberts	0:d88677306896	213	fwdLen = EXPECTED_LENGTH;
Wayne Roberts	0:d88677306896	214	}
Wayne Roberts	0:d88677306896	215	fwdLen = forwardLen;
Wayne Roberts	0:d88677306896	216
Wayne Roberts	0:d88677306896	217	f.octet = Radio::radio.tx_buf[1];
Wayne Roberts	0:d88677306896	218
Wayne Roberts	0:d88677306896	219	txCurs = 0;
Wayne Roberts	0:d88677306896	220	Radio::radio.tx_buf[txCurs++] = UNIT_ID;
Wayne Roberts	0:d88677306896	221	txCurs++; // placeholder for flags to be added at end
Wayne Roberts	0:d88677306896	222
Wayne Roberts	0:d88677306896	223	toSendLen = fwdLen - forwardLenAckd;
Wayne Roberts	0:d88677306896	224	forwardLenTransmitted = forwardLenAckd;
Wayne Roberts	0:d88677306896	225	added = 0;
Wayne Roberts	0:d88677306896	226	while ((txCurs + sizeof(message_t)) < stop && added < toSendLen) {
Wayne Roberts	0:d88677306896	227	memcpy(Radio::radio.tx_buf + txCurs, forward + forwardLenTransmitted, sizeof(message_t));
Wayne Roberts	0:d88677306896	228	forwardLenTransmitted += sizeof(message_t);
Wayne Roberts	0:d88677306896	229	txCurs += sizeof(message_t);
Wayne Roberts	0:d88677306896	230	added += sizeof(message_t);
Wayne Roberts	0:d88677306896	231	}
Wayne Roberts	0:d88677306896	232
Wayne Roberts	0:d88677306896	233	avail = stop - txCurs;
Wayne Roberts	0:d88677306896	234	if (avail >= sizeof(message_t)) {
Wayne Roberts	0:d88677306896	235	message_t* mptr = (message_t*)(Radio::radio.tx_buf + txCurs);
Wayne Roberts	0:d88677306896	236	mptr->unit_id = UNIT_ID;
Wayne Roberts	0:d88677306896	237	mptr->flags = 0x00;
Wayne Roberts	0:d88677306896	238	mptr->sample = ain.read_u16();
Wayne Roberts	0:d88677306896	239	#ifdef N_SMP
Wayne Roberts	0:d88677306896	240	for (c = 0; c < N_SMP; c++)
Wayne Roberts	0:d88677306896	241	mptr->samples[c] = ain.read_u16();
Wayne Roberts	0:d88677306896	242	#endif
Wayne Roberts	0:d88677306896	243	txCurs += sizeof(message_t);
Wayne Roberts	0:d88677306896	244
Wayne Roberts	0:d88677306896	245	f.bits.fragLast = 1;
Wayne Roberts	0:d88677306896	246	}
Wayne Roberts	0:d88677306896	247
Wayne Roberts	0:d88677306896	248	Radio::radio.tx_buf[1] = f.octet;
Wayne Roberts	0:d88677306896	249
Wayne Roberts	0:d88677306896	250	c = crc16(Radio::radio.tx_buf, txCurs);
Wayne Roberts	0:d88677306896	251	Radio::radio.tx_buf[txCurs++] = c >> 8;
Wayne Roberts	0:d88677306896	252	Radio::radio.tx_buf[txCurs++] = c;
Wayne Roberts	0:d88677306896	253
Wayne Roberts	0:d88677306896	254	Radio::Send(txCurs, 0, 0, 0);
Wayne Roberts	0:d88677306896	255	state = STATE_ACK_WAITING;
Wayne Roberts	0:d88677306896	256	flags._sleep_ = 0;
Wayne Roberts	0:d88677306896	257
Wayne Roberts	0:d88677306896	258	return txCurs;
Wayne Roberts	0:d88677306896	259	} // .._tx_forward()
Wayne Roberts	0:d88677306896	260
Wayne Roberts	0:d88677306896	261	volatile us_timestamp_t prevFwdStart;
Wayne Roberts	0:d88677306896	262
Wayne Roberts	0:d88677306896	263	void tx_forward_cb()
Wayne Roberts	0:d88677306896	264	{
Wayne Roberts	0:d88677306896	265	unsigned dur;
Wayne Roberts	0:d88677306896	266	uint8_t txlen;
Wayne Roberts	0:d88677306896	267	us_timestamp_t now;
Wayne Roberts	0:d88677306896	268
Wayne Roberts	0:d88677306896	269	now = Radio::lpt.read_us();
Wayne Roberts	0:d88677306896	270
Wayne Roberts	0:d88677306896	271	if (measuredIntervalSaved != 0) // in case nothing received
Wayne Roberts	0:d88677306896	272	mbedTImeout_forwarder.attach_us(tx_forward_cb, measuredIntervalSaved);
Wayne Roberts	0:d88677306896	273
Wayne Roberts	0:d88677306896	274	Radio::radio.tx_buf[1] = 0; //initialize flags
Wayne Roberts	0:d88677306896	275	forwardLenAckd = 0;
Wayne Roberts	0:d88677306896	276
Wayne Roberts	0:d88677306896	277	txlen = _tx_forward();
Wayne Roberts	0:d88677306896	278
Wayne Roberts	0:d88677306896	279	flags.mbedTImeout_forwarderStarted = 0;
Wayne Roberts	0:d88677306896	280
Wayne Roberts	0:d88677306896	281	dur = Radio::lora_toa_us(txlen);
Wayne Roberts	0:d88677306896	282	pc.printf("\e[7mtx_forward_cb %d", now - prevFwdStart - TX_INTERVAL_US);
Wayne Roberts	0:d88677306896	283	pc.printf(" dur%u\e[0m\r\n", dur);
Wayne Roberts	0:d88677306896	284	prevFwdStart = now;
Wayne Roberts	0:d88677306896	285	}
Wayne Roberts	0:d88677306896	286	#else // ..UNIT_LAST:
Wayne Roberts	0:d88677306896	287	void uart_forward_cb()
Wayne Roberts	0:d88677306896	288	{
Wayne Roberts	0:d88677306896	289	if (measuredIntervalSaved != 0) // in case nothing received
Wayne Roberts	0:d88677306896	290	mbedTImeout_forwarder.attach_us(uart_forward_cb, measuredIntervalSaved);
Wayne Roberts	0:d88677306896	291
Wayne Roberts	0:d88677306896	292	forwardLenAckd = 0;
Wayne Roberts	0:d88677306896	293	print_payload();
Wayne Roberts	0:d88677306896	294
Wayne Roberts	0:d88677306896	295	setupNext();
Wayne Roberts	0:d88677306896	296
Wayne Roberts	0:d88677306896	297	flags.mbedTImeout_forwarderStarted = 0;
Wayne Roberts	0:d88677306896	298	}
Wayne Roberts	0:d88677306896	299	#endif /* UNIT_LAST */
Wayne Roberts	0:d88677306896	300
Wayne Roberts	0:d88677306896	301	void nextRxStartCB()
Wayne Roberts	0:d88677306896	302	{
Wayne Roberts	0:d88677306896	303	unsigned us;
Wayne Roberts	0:d88677306896	304
Wayne Roberts	0:d88677306896	305	Radio::Rx();
Wayne Roberts	0:d88677306896	306	rxStartAt = Radio::lpt.read_us();
Wayne Roberts	0:d88677306896	307	flags._sleep_ = 0;
Wayne Roberts	0:d88677306896	308
Wayne Roberts	0:d88677306896	309	us = (MAX_TX_ATTEMPTS * retryInterval_us) + (MAX_TX_ATTEMPTS * TXRX_PADDING_US);
Wayne Roberts	0:d88677306896	310
Wayne Roberts	0:d88677306896	311	pc.printf("nextRxStartCB for %uus\r\n", us);
Wayne Roberts	0:d88677306896	312	}
Wayne Roberts	0:d88677306896	313
Wayne Roberts	0:d88677306896	314
Wayne Roberts	0:d88677306896	315	void txDoneCB()
Wayne Roberts	0:d88677306896	316	{
Wayne Roberts	0:d88677306896	317	char str[32];
Wayne Roberts	0:d88677306896	318
Wayne Roberts	0:d88677306896	319	Radio::Rx();
Wayne Roberts	0:d88677306896	320	stateToString(state, str);
Wayne Roberts	0:d88677306896	321	pc.printf("%s:txDone->Rx\r\n", str);
Wayne Roberts	0:d88677306896	322	}
Wayne Roberts	0:d88677306896	323
Wayne Roberts	0:d88677306896	324	void rxDoneCB(uint8_t size, float rssi, float snr)
Wayne Roberts	0:d88677306896	325	{
Wayne Roberts	0:d88677306896	326	pkt_flags_t f;
Wayne Roberts	0:d88677306896	327	char str[32];
Wayne Roberts	0:d88677306896	328	us_timestamp_t rxIrqAt = Radio::irqAt;
Wayne Roberts	0:d88677306896	329
Wayne Roberts	0:d88677306896	330	stateToString(state, str);
Wayne Roberts	0:d88677306896	331	pc.printf("\e[33mrxDoneCB() %u rssi:%.1fdBm snr:%.1fdB %s ID:%02x\e[0m ", size, rssi, snr, str, Radio::radio.rx_buf[0]);
Wayne Roberts	0:d88677306896	332	if (state == STATE_GET_REQ) {
Wayne Roberts	0:d88677306896	333	uint8_t len;
Wayne Roberts	0:d88677306896	334	unsigned c, rxc;
Wayne Roberts	0:d88677306896	335	if (Radio::radio.rx_buf[0] != UNIT_ID-1) {
Wayne Roberts	0:d88677306896	336	pc.printf("\r\n");
Wayne Roberts	0:d88677306896	337	return;
Wayne Roberts	0:d88677306896	338	}
Wayne Roberts	0:d88677306896	339	if (size < 4) {
Wayne Roberts	0:d88677306896	340	/* minimum: header + crc */
Wayne Roberts	0:d88677306896	341	pc.printf("\r\n");
Wayne Roberts	0:d88677306896	342	return;
Wayne Roberts	0:d88677306896	343	}
Wayne Roberts	0:d88677306896	344	f.octet = Radio::radio.rx_buf[1];
Wayne Roberts	0:d88677306896	345
Wayne Roberts	0:d88677306896	346	c = crc16(Radio::radio.rx_buf, size-2);
Wayne Roberts	0:d88677306896	347	rxc = Radio::radio.rx_buf[size-2];
Wayne Roberts	0:d88677306896	348	rxc <<= 8;
Wayne Roberts	0:d88677306896	349	rxc \|= Radio::radio.rx_buf[size-1];
Wayne Roberts	0:d88677306896	350	if (c != rxc) {
Wayne Roberts	0:d88677306896	351	pc.printf("\e[31mfrom%02x c:%04x rxc:%04x\e[0m\r\n", Radio::radio.rx_buf[0], c, rxc);
Wayne Roberts	0:d88677306896	352	for (unsigned n = 0; n < size; n++)
Wayne Roberts	0:d88677306896	353	pc.printf("%02x ", Radio::radio.rx_buf[n]);
Wayne Roberts	0:d88677306896	354	pc.printf("\r\n");
Wayne Roberts	0:d88677306896	355	return;
Wayne Roberts	0:d88677306896	356	}
Wayne Roberts	0:d88677306896	357	//noRxTimeout.detach();
Wayne Roberts	0:d88677306896	358
Wayne Roberts	0:d88677306896	359	pc.printf(" attempt%u frag%u fragLast%u ", f.bits.attempt, f.bits.fragNum, f.bits.fragLast);
Wayne Roberts	0:d88677306896	360	if (state == STATE_GET_REQ && flags.mbedTImeout_forwarderStarted == 0 && f.bits.fragLast) {
Wayne Roberts	0:d88677306896	361	us_timestamp_t now;
Wayne Roberts	0:d88677306896	362	unsigned sinceRxDone, us;
Wayne Roberts	0:d88677306896	363	mbedTImeout_forwarder.detach();
Wayne Roberts	0:d88677306896	364	now = Radio::lpt.read_us();
Wayne Roberts	0:d88677306896	365	sinceRxDone = now - rxIrqAt;
Wayne Roberts	0:d88677306896	366	us = retryInterval_us * (MAX_TX_ATTEMPTS - f.bits.attempt);
Wayne Roberts	0:d88677306896	367	int target_us = us - sinceRxDone;
Wayne Roberts	0:d88677306896	368	// tx to occur after time given for all potential retries
Wayne Roberts	0:d88677306896	369	#ifndef UNIT_LAST
Wayne Roberts	0:d88677306896	370	mbedTImeout_forwarder.attach_us(tx_forward_cb, target_us);
Wayne Roberts	0:d88677306896	371	#else
Wayne Roberts	0:d88677306896	372	mbedTImeout_forwarder.attach_us(uart_forward_cb, target_us);
Wayne Roberts	0:d88677306896	373	#endif /* UNIT_LAST */
Wayne Roberts	0:d88677306896	374	pc.printf("schedule forward %u, forwarding in %dus. sinceRxDone:%u\r\n", MAX_TX_ATTEMPTS - f.bits.attempt, target_us, sinceRxDone);
Wayne Roberts	0:d88677306896	375	flags.mbedTImeout_forwarderStarted = 1;
Wayne Roberts	0:d88677306896	376	forwardedAt = now + target_us;
Wayne Roberts	0:d88677306896	377	}
Wayne Roberts	0:d88677306896	378
Wayne Roberts	0:d88677306896	379	Radio::radio.tx_buf[0] = UNIT_ID; // OK, send ACK
Wayne Roberts	0:d88677306896	380	Radio::Send(1, 0, 0, 0);
Wayne Roberts	0:d88677306896	381
Wayne Roberts	0:d88677306896	382
Wayne Roberts	0:d88677306896	383	if (prevFrag != f.bits.fragNum) {
Wayne Roberts	0:d88677306896	384	len = size - 4; // -4: header ... crc
Wayne Roberts	0:d88677306896	385	memcpy(forward + forwardLen, Radio::radio.rx_buf+2, len);
Wayne Roberts	0:d88677306896	386	forwardLen += len;
Wayne Roberts	0:d88677306896	387
Wayne Roberts	0:d88677306896	388	prevFrag = f.bits.fragNum;
Wayne Roberts	0:d88677306896	389	}
Wayne Roberts	0:d88677306896	390
Wayne Roberts	0:d88677306896	391	if (f.bits.fragNum == 0) {
Wayne Roberts	0:d88677306896	392	unsigned attemptOffset = retryInterval_us * f.bits.attempt;
Wayne Roberts	0:d88677306896	393	if (rxStartAt == 0) {
Wayne Roberts	0:d88677306896	394	pc.printf("\e[7m");
Wayne Roberts	0:d88677306896	395	}
Wayne Roberts	0:d88677306896	396	pc.printf("lastRxIrqAt:%u measuredInterval:%llu ", lastRxIrqAt, measuredInterval);
Wayne Roberts	0:d88677306896	397	if (lastRxIrqAt != 0) {
Wayne Roberts	0:d88677306896	398	us_timestamp_t thisMeas;
Wayne Roberts	0:d88677306896	399	int err_;
Wayne Roberts	0:d88677306896	400	unsigned abserr;
Wayne Roberts	0:d88677306896	401	thisMeas = (rxIrqAt - attemptOffset) - lastRxIrqAt;
Wayne Roberts	0:d88677306896	402	err_ = thisMeas - TX_INTERVAL_US;
Wayne Roberts	0:d88677306896	403	if (TX_INTERVAL_US > thisMeas)
Wayne Roberts	0:d88677306896	404	abserr = TX_INTERVAL_US - thisMeas;
Wayne Roberts	0:d88677306896	405	else
Wayne Roberts	0:d88677306896	406	abserr = thisMeas - TX_INTERVAL_US;
Wayne Roberts	0:d88677306896	407
Wayne Roberts	0:d88677306896	408	pc.printf(" this:%llu err_:%d ", thisMeas, err_);
Wayne Roberts	0:d88677306896	409	if (abserr < MEASURED_MAX_ERR) {
Wayne Roberts	0:d88677306896	410	int rxPrecedency = 0;
Wayne Roberts	0:d88677306896	411	unsigned sinceRxDone, _us_;
Wayne Roberts	0:d88677306896	412	unsigned pktDur = Radio::lora_toa_us(size);
Wayne Roberts	0:d88677306896	413	us_timestamp_t firstAttemptStartedAt = (rxIrqAt - attemptOffset) - pktDur;
Wayne Roberts	0:d88677306896	414
Wayne Roberts	0:d88677306896	415	measuredInterval = thisMeas;
Wayne Roberts	0:d88677306896	416	_us_ = measuredInterval;
Wayne Roberts	0:d88677306896	417	pc.printf("->%llu ", measuredInterval);
Wayne Roberts	0:d88677306896	418
Wayne Roberts	0:d88677306896	419	if (rxStartAt != 0) {
Wayne Roberts	0:d88677306896	420	rxPrecedency = firstAttemptStartedAt - rxStartAt;
Wayne Roberts	0:d88677306896	421	if (rxPrecedency > 0)
Wayne Roberts	0:d88677306896	422	_us_ += rxPrecedency / 2;
Wayne Roberts	0:d88677306896	423	else
Wayne Roberts	0:d88677306896	424	_us_ += rxPrecedency;
Wayne Roberts	0:d88677306896	425	}
Wayne Roberts	0:d88677306896	426
Wayne Roberts	0:d88677306896	427	_us_ -= rxStartup_us;
Wayne Roberts	0:d88677306896	428	_us_ -= retryInterval_us; // TODO
Wayne Roberts	0:d88677306896	429	mbedTimeout_nextRx.detach();
Wayne Roberts	0:d88677306896	430	sinceRxDone = Radio::lpt.read_us() - rxIrqAt;
Wayne Roberts	0:d88677306896	431	mbedTimeout_nextRx.attach_us(nextRxStartCB, _us_ - sinceRxDone);
Wayne Roberts	0:d88677306896	432	pc.printf("nextRx:%u ao%u rxPrecedency:%d pktDur%u ri%u sinceRxDone%u ", _us_ - sinceRxDone, attemptOffset, rxPrecedency, pktDur, retryInterval_us, sinceRxDone);
Wayne Roberts	0:d88677306896	433
Wayne Roberts	0:d88677306896	434	if (measuredIntervalSaved == 0)
Wayne Roberts	0:d88677306896	435	measuredIntervalSaved = measuredInterval;
Wayne Roberts	0:d88677306896	436	else {
Wayne Roberts	0:d88677306896	437	measuredIntervalSaved += measuredInterval;
Wayne Roberts	0:d88677306896	438	measuredIntervalSaved /= 2;
Wayne Roberts	0:d88677306896	439	}
Wayne Roberts	0:d88677306896	440
Wayne Roberts	0:d88677306896	441	rxStartAt = 0;
Wayne Roberts	0:d88677306896	442	} else
Wayne Roberts	0:d88677306896	443	pc.printf("\e[31mtoo-much-err\e[0m\r\n");
Wayne Roberts	0:d88677306896	444
Wayne Roberts	0:d88677306896	445	pc.printf("\r\n");
Wayne Roberts	0:d88677306896	446	} // ..if (lastRxIrqAt != 0)
Wayne Roberts	0:d88677306896	447
Wayne Roberts	0:d88677306896	448	lastRxIrqAt = rxIrqAt - attemptOffset;
Wayne Roberts	0:d88677306896	449
Wayne Roberts	0:d88677306896	450	pc.printf("\e[0m");
Wayne Roberts	0:d88677306896	451	} // ..if (f.bits.fragNum == 0)
Wayne Roberts	0:d88677306896	452
Wayne Roberts	0:d88677306896	453	} // ..if (state == STATE_GET_REQ)
Wayne Roberts	0:d88677306896	454	#ifndef UNIT_LAST
Wayne Roberts	0:d88677306896	455	else if (state == STATE_ACK_WAITING) {
Wayne Roberts	0:d88677306896	456
Wayne Roberts	0:d88677306896	457	if (Radio::radio.rx_buf[0] == UNIT_ID+1) {
Wayne Roberts	0:d88677306896	458	pkt_flags_t f;
Wayne Roberts	0:d88677306896	459	f.octet = Radio::radio.tx_buf[1];
Wayne Roberts	0:d88677306896	460
Wayne Roberts	0:d88677306896	461	tickerRetry.detach();
Wayne Roberts	0:d88677306896	462	forwardLenAckd = forwardLenTransmitted;
Wayne Roberts	0:d88677306896	463	if (f.bits.fragLast) {
Wayne Roberts	0:d88677306896	464	pc.printf("ackOk-last ");
Wayne Roberts	0:d88677306896	465	#if (UNIT_ID == 0x00)
Wayne Roberts	0:d88677306896	466	pc.printf("->SLEEP ");
Wayne Roberts	0:d88677306896	467	flags._sleep_ = 1;
Wayne Roberts	0:d88677306896	468	Radio::Sleep();
Wayne Roberts	0:d88677306896	469	#else
Wayne Roberts	0:d88677306896	470	setupNext();
Wayne Roberts	0:d88677306896	471	#endif /* UNIT_ID != 0x00 */
Wayne Roberts	0:d88677306896	472	} else {
Wayne Roberts	0:d88677306896	473	f.bits.fragNum++;
Wayne Roberts	0:d88677306896	474	f.bits.attempt = 0;
Wayne Roberts	0:d88677306896	475	Radio::radio.tx_buf[1] = f.octet;
Wayne Roberts	0:d88677306896	476	_tx_forward();
Wayne Roberts	0:d88677306896	477	pc.printf("ackOk->%u ", f.bits.fragNum);
Wayne Roberts	0:d88677306896	478	}
Wayne Roberts	0:d88677306896	479	} else
Wayne Roberts	0:d88677306896	480	pc.printf("ack from different ID %02x\r\n", Radio::radio.rx_buf[0]);
Wayne Roberts	0:d88677306896	481	}
Wayne Roberts	0:d88677306896	482	#endif /* UNIT_LAST */
Wayne Roberts	0:d88677306896	483
Wayne Roberts	0:d88677306896	484	pc.printf("\r\n");
Wayne Roberts	0:d88677306896	485	} // ..rxDoneCB()
Wayne Roberts	0:d88677306896	486
Wayne Roberts	0:d88677306896	487	#if (UNIT_ID == 0x00) && !defined(UNIT_LAST)
Wayne Roberts	0:d88677306896	488	LowPowerTicker lpTicker;
Wayne Roberts	0:d88677306896	489
Wayne Roberts	0:d88677306896	490	void tx_ticker_cb(void) {
Wayne Roberts	0:d88677306896	491	unsigned c;
Wayne Roberts	0:d88677306896	492	pkt_flags_t f;
Wayne Roberts	0:d88677306896	493	message_t* mptr;
Wayne Roberts	0:d88677306896	494
Wayne Roberts	0:d88677306896	495	tickerRetry.attach_us(retry_cb, retryInterval_us);
Wayne Roberts	0:d88677306896	496
Wayne Roberts	0:d88677306896	497	f.bits.attempt = 0;
Wayne Roberts	0:d88677306896	498	f.bits.fragNum = 0;
Wayne Roberts	0:d88677306896	499	f.bits.fragLast = 1;
Wayne Roberts	0:d88677306896	500
Wayne Roberts	0:d88677306896	501	txCurs = 0;
Wayne Roberts	0:d88677306896	502	Radio::radio.tx_buf[txCurs++] = UNIT_ID;
Wayne Roberts	0:d88677306896	503	Radio::radio.tx_buf[txCurs++] = f.octet;
Wayne Roberts	0:d88677306896	504
Wayne Roberts	0:d88677306896	505	mptr = (message_t*)(Radio::radio.tx_buf + txCurs);
Wayne Roberts	0:d88677306896	506	mptr->unit_id = UNIT_ID;
Wayne Roberts	0:d88677306896	507	mptr->flags = 0x00;
Wayne Roberts	0:d88677306896	508	mptr->sample = ain.read_u16();
Wayne Roberts	0:d88677306896	509	#ifdef N_SMP
Wayne Roberts	0:d88677306896	510	for (c = 0; c < N_SMP; c++)
Wayne Roberts	0:d88677306896	511	mptr->samples[c] = ain.read_u16();
Wayne Roberts	0:d88677306896	512	#endif
Wayne Roberts	0:d88677306896	513	txCurs += sizeof(message_t);
Wayne Roberts	0:d88677306896	514
Wayne Roberts	0:d88677306896	515	c = crc16(Radio::radio.tx_buf, txCurs);
Wayne Roberts	0:d88677306896	516	Radio::radio.tx_buf[txCurs++] = c >> 8;
Wayne Roberts	0:d88677306896	517	Radio::radio.tx_buf[txCurs++] = c;
Wayne Roberts	0:d88677306896	518
Wayne Roberts	0:d88677306896	519	Radio::Send(txCurs, 0, 0, 0);
Wayne Roberts	0:d88677306896	520	state = STATE_ACK_WAITING;
Wayne Roberts	0:d88677306896	521	pc.printf("tx_ticker_cb:%u \r\n", mptr->sample);
Wayne Roberts	0:d88677306896	522	flags._sleep_ = 0;
Wayne Roberts	0:d88677306896	523	}
Wayne Roberts	0:d88677306896	524	#endif /* UNIT_ID == 0x00 */
Wayne Roberts	0:d88677306896	525
Wayne Roberts	0:d88677306896	526	void uart_rx()
Wayne Roberts	0:d88677306896	527	{
Wayne Roberts	0:d88677306896	528	char str[32];
Wayne Roberts	0:d88677306896	529
Wayne Roberts	0:d88677306896	530	char ch = pc.getc();
Wayne Roberts	0:d88677306896	531	switch (ch) {
Wayne Roberts	0:d88677306896	532	case '+':
Wayne Roberts	0:d88677306896	533	rxStartup_us += 500;
Wayne Roberts	0:d88677306896	534	pc.printf("rxStartup_us:%u\r\n", rxStartup_us);
Wayne Roberts	0:d88677306896	535	break;
Wayne Roberts	0:d88677306896	536	case '-':
Wayne Roberts	0:d88677306896	537	if (rxStartup_us > 500)
Wayne Roberts	0:d88677306896	538	rxStartup_us -= 500;
Wayne Roberts	0:d88677306896	539	pc.printf("rxStartup_us:%u\r\n", rxStartup_us);
Wayne Roberts	0:d88677306896	540	break;
Wayne Roberts	0:d88677306896	541	case '.':
Wayne Roberts	0:d88677306896	542	Radio::PrintStatus();
Wayne Roberts	0:d88677306896	543	printf("UNIT_ID:%02x ", UNIT_ID);
Wayne Roberts	0:d88677306896	544	printf(" measuredInterval:%llu\r\n", measuredInterval);
Wayne Roberts	0:d88677306896	545	stateToString(state, str);
Wayne Roberts	0:d88677306896	546	printf("_sleep_:%u %s\r\n", flags._sleep_, str);
Wayne Roberts	0:d88677306896	547	break;
Wayne Roberts	0:d88677306896	548	case 'r':
Wayne Roberts	0:d88677306896	549	flags.run ^= 1;
Wayne Roberts	0:d88677306896	550	printf("\r\nrun %u\r\n", flags.run);
Wayne Roberts	0:d88677306896	551	if (flags.run == 0) {
Wayne Roberts	0:d88677306896	552	#ifndef UNIT_LAST
Wayne Roberts	0:d88677306896	553	tickerRetry.detach();
Wayne Roberts	0:d88677306896	554	#endif /* !UNIT_LAST */
Wayne Roberts	0:d88677306896	555	mbedTImeout_forwarder.detach();
Wayne Roberts	0:d88677306896	556	mbedTimeout_nextRx.detach();
Wayne Roberts	0:d88677306896	557
Wayne Roberts	0:d88677306896	558	flags._sleep_ = 1;
Wayne Roberts	0:d88677306896	559	Radio::Sleep();
Wayne Roberts	0:d88677306896	560	}
Wayne Roberts	0:d88677306896	561	break;
Wayne Roberts	0:d88677306896	562	} // ..switch (ch)
Wayne Roberts	0:d88677306896	563	}
Wayne Roberts	0:d88677306896	564
Wayne Roberts	0:d88677306896	565	int main()
Wayne Roberts	0:d88677306896	566	{
Wayne Roberts	0:d88677306896	567	flags.run = 1;
Wayne Roberts	0:d88677306896	568	pc.baud(115200);
Wayne Roberts	0:d88677306896	569	pc.printf("\r\nreset\r\n");
Wayne Roberts	0:d88677306896	570	Radio::Init(txDoneCB, rxDoneCB);
Wayne Roberts	0:d88677306896	571
Wayne Roberts	0:d88677306896	572	Radio::setFrfMHz(CF_MHZ);
Wayne Roberts	0:d88677306896	573	Radio::Config(500, SPREADING_FACTOR);
Wayne Roberts	0:d88677306896	574
Wayne Roberts	0:d88677306896	575	/* max TX length + turnaround + ACK length */
Wayne Roberts	0:d88677306896	576	retryInterval_us = Radio::lora_toa_us(MAX_TX_LENGTH) + TXRX_PADDING_US + Radio::lora_toa_us(1);
Wayne Roberts	0:d88677306896	577	#ifdef UNIT_LAST
Wayne Roberts	0:d88677306896	578	pc.printf("LAST ");
Wayne Roberts	0:d88677306896	579	#endif
Wayne Roberts	0:d88677306896	580	pc.printf("UNIT_ID:%02x retryInterval_us:%u\r\n", UNIT_ID, retryInterval_us);
Wayne Roberts	0:d88677306896	581
Wayne Roberts	0:d88677306896	582	flags._sleep_ = 0;
Wayne Roberts	0:d88677306896	583	state = STATE_NONE;
Wayne Roberts	0:d88677306896	584
Wayne Roberts	0:d88677306896	585	#if (UNIT_ID == 0x00) && !defined(UNIT_LAST)
Wayne Roberts	0:d88677306896	586	lpTicker.attach_us(tx_ticker_cb, TX_INTERVAL_US);
Wayne Roberts	0:d88677306896	587	#else
Wayne Roberts	0:d88677306896	588	Radio::PrintStatus();
Wayne Roberts	0:d88677306896	589
Wayne Roberts	0:d88677306896	590	setupNext();
Wayne Roberts	0:d88677306896	591
Wayne Roberts	0:d88677306896	592	measuredInterval = 0;
Wayne Roberts	0:d88677306896	593	lastRxIrqAt = 0;
Wayne Roberts	0:d88677306896	594	measuredIntervalSaved = 0;
Wayne Roberts	0:d88677306896	595	#endif /* UNIT_ID != 0x00 */
Wayne Roberts	0:d88677306896	596
Wayne Roberts	0:d88677306896	597	if (sleep_manager_can_deep_sleep())
Wayne Roberts	0:d88677306896	598	sleep_manager_lock_deep_sleep(); // prevent deep sleep
Wayne Roberts	0:d88677306896	599
Wayne Roberts	0:d88677306896	600	for (;;) {
Wayne Roberts	0:d88677306896	601	if (pc.readable()) {
Wayne Roberts	0:d88677306896	602	uart_rx();
Wayne Roberts	0:d88677306896	603	}
Wayne Roberts	0:d88677306896	604
Wayne Roberts	0:d88677306896	605	if (flags._sleep_ == 0) {
Wayne Roberts	0:d88677306896	606	Radio::service();
Wayne Roberts	0:d88677306896	607	} else
Wayne Roberts	0:d88677306896	608	sleep_manager_sleep_auto();;
Wayne Roberts	0:d88677306896	609
Wayne Roberts	0:d88677306896	610	} // ..for (;;)
Wayne Roberts	0:d88677306896	611	}
Wayne Roberts	0:d88677306896	612

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Type:	Program
Mbed OS support:	Mbed OS
Created:	11 Jun 2018
Imports:	6
Forks:	0
Commits:	7
Dependents:	0
Dependencies:	1
Followers:	1