Arduino uno & Libelium shield & sx1272 with LMIC lib. assert failure

[pluss2]

The goal what I want is OTAA(over the air activation) communication with Arduino(or raspberry pi 3) - Gateway(raspberry pi 3 or arduino) - TTN(the thing network).

Ready to execute code.. 1. Arduino Uno R3, computer-arduino serial cable 2. Arduino shield, sx1272 chip 3. LMIC library Version 1.5 4. Upload library to Arduino(IDE V1.6.11) sketch library. 5. Not modify pin map struct in raw.ino 6. Circuit image 7. Pin mapping

 const lmic_pinmap lmic_pins = {
     .nss = 6,
     .rxtx = LMIC_UNUSED_PIN,
     .rst = 5,
     .dio = {2, 3, 4},
 };

At first, i want to phy level communication(raw.ino in lmic library)test with just one arduino. So i modify some files like below

config.h

//#define CFG_eu868 1
//#define CFG_sx1276_radio 1
#define CFG_us915 1
#define CFG_sx1272_radio 1
#define DISABLE_INVERT_IQ_ON_RX

hal/hal.cpp

static const SPISettings settings(10E6, MSBFIRST, SPI_MODE0)
// static const SPISettings settings(1E6, MSBFIRST, SPI_MODE0)
// static const SPISettings settings(4E6, MSBFIRST, SPI_MODE0)

Question 1. I tried all the comments, but i get the following error. how can i fix error ? Starting FAILURE C:\Users\Jaeho Shin\Documents\Arduino\libraries\arduino-lmic-master\src \lmic\radio.c:702

Question 2. is this link correct gateway source code ?

[Oliv4945]

@pluss2

Question 1.

There is no assertion in radio.c L702 in master, did you modify the code ? Could you please show your line 702 ? I assume that it is the assertion about chip version, could you please try to print the variable v L687 ? Did you double checked lmic_pins declaration and jumpers on your shield ?

[pluss2]

Sorry about that. The error appear at line L691.

Also, i connect shield like this, no jumper on my shield.

When i connect sx1272 chip at left on figure v is 0. But v is 82 when i connect sx1272 chip at right.

Q1. what is the problem ? and what is the number 82 means ? Q2. is lmic_pins value right? Q3. should i control Multiprotocol shield (2.1)?

p.s. my raw.ino code is below

#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>

#if !defined(DISABLE_INVERT_IQ_ON_RX)
#error This example requires DISABLE_INVERT_IQ_ON_RX to be set. Update \
       config.h in the lmic library to set it.
#endif

// How often to send a packet. Note that this sketch bypasses the normal
// LMIC duty cycle limiting, so when you change anything in this sketch
// (payload length, frequency, spreading factor), be sure to check if
// this interval should not also be increased.
// See this spreadsheet for an easy airtime and duty cycle calculator:
// https://docs.google.com/spreadsheets/d/1voGAtQAjC1qBmaVuP1ApNKs1ekgUjavHuVQIXyYSvNc 
#define TX_INTERVAL 2000

// Pin mapping
const lmic_pinmap lmic_pins = {
    .nss = 6,
    .rxtx = LMIC_UNUSED_PIN,
    .rst = 5,
    .dio = {2, 3, 4},
};

// These callbacks are only used in over-the-air activation, so they are
// left empty here (we cannot leave them out completely unless
// DISABLE_JOIN is set in config.h, otherwise the linker will complain).
void os_getArtEui (u1_t* buf) { }
void os_getDevEui (u1_t* buf) { }
void os_getDevKey (u1_t* buf) { }

void onEvent (ev_t ev) {
}

osjob_t txjob;
osjob_t timeoutjob;
static void tx_func (osjob_t* job);

// Transmit the given string and call the given function afterwards
void tx(const char *str, osjobcb_t func) {
  os_radio(RADIO_RST); // Stop RX first
  delay(1); // Wait a bit, without this os_radio below asserts, apparently because the state hasn't changed yet
  LMIC.dataLen = 0;
  while (*str)
    LMIC.frame[LMIC.dataLen++] = *str++;
  LMIC.osjob.func = func;
  os_radio(RADIO_TX);
  Serial.println("TX");
}

// Enable rx mode and call func when a packet is received
void rx(osjobcb_t func) {
  LMIC.osjob.func = func;
  LMIC.rxtime = os_getTime(); // RX _now_
  // Enable "continuous" RX (e.g. without a timeout, still stops after
  // receiving a packet)
  os_radio(RADIO_RXON);
  Serial.println("RX");
}

static void rxtimeout_func(osjob_t *job) {
  digitalWrite(LED_BUILTIN, LOW); // off
}

static void rx_func (osjob_t* job) {
  // Blink once to confirm reception and then keep the led on
  digitalWrite(LED_BUILTIN, LOW); // off
  delay(10);
  digitalWrite(LED_BUILTIN, HIGH); // on

  // Timeout RX (i.e. update led status) after 3 periods without RX
  os_setTimedCallback(&timeoutjob, os_getTime() + ms2osticks(3*TX_INTERVAL), rxtimeout_func);

  // Reschedule TX so that it should not collide with the other side's
  // next TX
  os_setTimedCallback(&txjob, os_getTime() + ms2osticks(TX_INTERVAL/2), tx_func);

  Serial.print("Got ");
  Serial.print(LMIC.dataLen);
  Serial.println(" bytes");
  Serial.write(LMIC.frame, LMIC.dataLen);
  Serial.println();

  // Restart RX
  rx(rx_func);
}

static void txdone_func (osjob_t* job) {
  rx(rx_func);
}

// log text to USART and toggle LED
static void tx_func (osjob_t* job) {
  // say hello
  tx("Hello, world!", txdone_func);
  // reschedule job every TX_INTERVAL (plus a bit of random to prevent
  // systematic collisions), unless packets are received, then rx_func
  // will reschedule at half this time.
  os_setTimedCallback(job, os_getTime() + ms2osticks(TX_INTERVAL + random(500)), tx_func);
}

// application entry point
void setup() {  
  Serial.begin(115200);
  Serial.println("Starting");
  #ifdef VCC_ENABLE
  // For Pinoccio Scout boards
  pinMode(VCC_ENABLE, OUTPUT);
  digitalWrite(VCC_ENABLE, HIGH);
  delay(1000);
  #endif

  pinMode(LED_BUILTIN, OUTPUT);

  // initialize runtime env
  os_init();  

  // Set up these settings once, and use them for both TX and RX

#if defined(CFG_eu868)
  // Use a frequency in the g3 which allows 10% duty cycling.
  LMIC.freq = 869525000;
#elif defined(CFG_us915)
  LMIC.freq = 902300000;
#endif

  // Maximum TX power
  LMIC.txpow = 27;
  // Use a medium spread factor. This can be increased up to SF12 for
  // better range, but then the interval should be (significantly)
  // lowered to comply with duty cycle limits as well.
  LMIC.datarate = DR_SF9;
  // This sets CR 4/5, BW125 (except for DR_SF7B, which uses BW250)
  LMIC.rps = updr2rps(LMIC.datarate);

  Serial.println("Started");
  Serial.flush();

  // setup initial job
  os_setCallback(&txjob, tx_func);
}

void loop() {      
  // execute scheduled jobs and events
  os_runloop_once();
}

[Oliv4945]

Q1. what is the problem ? and what is the number 82 means ?

I do not know. It should be 0x22 for the SX1272. Do you have an oscilloscope or logic analyser to hook up and verify SPI communication ?

Q2. is lmic_pins value right? Q3. should i control Multiprotocol shield (2.1)?

lmic_pins depends of your shield, it seems that yours have an I/O expander so you should ask Libellium about that.

[trlafleur]

If you look at the data sheet for the radio, each radio model has a unique ID

SX1276 is 0x12 and SX1272 is 0x22 so, it checking to make sure it has a correct radio attach....

if you have a RFM9x series radio, it should report one of these... unless their a new variant out there...

On Wed, Dec 28, 2016 at 3:33 AM, pluss2 notifications@github.com wrote:

Sorry about that. The error appear at line L691 https://github.com/matthijskooijman/arduino-lmic/blob/master/src/lmic/radio.c#L691 .

So, when I check the value v, v is 82. what is the problem ? and what is number 82 means ?

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