Created SPI not working

[k8zxc]

I've tested the LoRaWANTestOTAA.ino in this repo. Also, I created a new SPI following this tutorial: https://learn.adafruit.com/using-atsamd21-sercom-to-add-more-spi-i2c-serial-ports/creating-a-new-spi. I am absolutely a beginner and need a help. Here's my code.

/*******************************************************************************

• Copyright (c) 2015 Thomas Telkamp and Matthijs Kooijman
• Permission is hereby granted, free of charge, to anyone
• obtaining a copy of this document and accompanying files,
• to do whatever they want with them without any restriction,
• including, but not limited to, copying, modification and redistribution.
• NO WARRANTY OF ANY KIND IS PROVIDED.
• This example sends a valid LoRaWAN packet with payload "Hello,
• world!", using frequency and encryption settings matching those of
• the The Things Network.
• This uses ABP (Activation-by-personalisation), where a DevAddr and
• Session keys are preconfigured (unlike OTAA, where a DevEUI and
• application key is configured, while the DevAddr and session keys are
• assigned/generated in the over-the-air-activation procedure).
• Note: LoRaWAN per sub-band duty-cycle limitation is enforced (1% in
• g1, 0.1% in g2), but not the TTN fair usage policy (which is probably
• violated by this sketch when left running for longer)!
• To use this sketch, first register your application and device with
• the things network, to set or generate a DevAddr, NwkSKey and
• AppSKey. Each device should have their own unique values for these
• fields.
• Do not forget to define the radio type correctly in config.h.

*******************************************************************************/

//#include<Arduino.h> #include <lmic.h> #include <hal/hal.h> #include <SPI.h> #include "wiring_private.h"

SPIClass SPI1 (&sercom1, 12, 13, 11, SPI_PAD_0_SCK_1, SERCOM_RX_PAD_3);

// LoRaWAN NwkSKey, network session key // This is the default Semtech key, which is used by the early prototype TTN // network. static const PROGMEM u1_t NWKSKEY[16] = { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C };

// LoRaWAN AppSKey, application session key // This is the default Semtech key, which is used by the early prototype TTN // network. static const u1_t PROGMEM APPSKEY[16] = { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C };

// LoRaWAN end-device address (DevAddr) static const u4_t DEVADDR = 0x03FF0001 ; // <-- Change this address for every node!

// 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) { }

static uint8_t mydata[] = "Hello, world!"; static osjob_t sendjob;

// Schedule TX every this many seconds (might become longer due to duty // cycle limitations). const unsigned TX_INTERVAL = 60;

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

void onEvent (ev_t ev) { SerialUSB.print(os_getTime()); SerialUSB.print(": "); switch(ev) { case EV_SCAN_TIMEOUT: SerialUSB.println(F("EV_SCAN_TIMEOUT")); break; case EV_BEACON_FOUND: SerialUSB.println(F("EV_BEACON_FOUND")); break; case EV_BEACON_MISSED: SerialUSB.println(F("EV_BEACON_MISSED")); break; case EV_BEACON_TRACKED: SerialUSB.println(F("EV_BEACON_TRACKED")); break; case EV_JOINING: SerialUSB.println(F("EV_JOINING")); break; case EV_JOINED: SerialUSB.println(F("EV_JOINED")); break; case EV_RFU1: SerialUSB.println(F("EV_RFU1")); break; case EV_JOIN_FAILED: SerialUSB.println(F("EV_JOIN_FAILED")); break; case EV_REJOIN_FAILED: SerialUSB.println(F("EV_REJOIN_FAILED")); break; case EV_TXCOMPLETE: SerialUSB.println(F("EV_TXCOMPLETE (includes waiting for RX windows)")); if (LMIC.txrxFlags & TXRX_ACK) SerialUSB.println(F("Received ack")); if (LMIC.dataLen) { SerialUSB.println(F("Received ")); SerialUSB.println(LMIC.dataLen); SerialUSB.println(F(" bytes of payload")); } // Schedule next transmission os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send); break; case EV_LOST_TSYNC: SerialUSB.println(F("EV_LOST_TSYNC")); break; case EV_RESET: SerialUSB.println(F("EV_RESET")); break; case EV_RXCOMPLETE: // data received in ping slot SerialUSB.println(F("EV_RXCOMPLETE")); break; case EV_LINK_DEAD: SerialUSB.println(F("EV_LINK_DEAD")); break; case EV_LINK_ALIVE: SerialUSB.println(F("EV_LINK_ALIVE")); break; default: SerialUSB.println(F("Unknown event")); break; } }

void do_send(osjob_t* j){ // Check if there is not a current TX/RX job running if (LMIC.opmode & OP_TXRXPEND) { SerialUSB.println(F("OP_TXRXPEND, not sending")); } else { // Prepare upstream data transmission at the next possible time. LMIC_setTxData2(1, mydata, sizeof(mydata)-1, 0); SerialUSB.println(F("Packet queued")); } // Next TX is scheduled after TX_COMPLETE event. }

void setup() { SerialUSB.begin(115200); SerialUSB.println(F("Starting")); SPI1.begin(); pinPeripheral(11, PIO_SERCOM); pinPeripheral(12, PIO_SERCOM); pinPeripheral(13, PIO_SERCOM);

/*
#ifdef VCC_ENABLE
// For Pinoccio Scout boards
pinMode(VCC_ENABLE, OUTPUT);
digitalWrite(VCC_ENABLE, HIGH);
delay(1000);
#endif
*/

// LMIC init
os_init();
// Reset the MAC state. Session and pending data transfers will be discarded.
LMIC_reset();

// Set static session parameters. Instead of dynamically establishing a session
// by joining the network, precomputed session parameters are be provided.
#ifdef PROGMEM
// On AVR, these values are stored in flash and only copied to RAM
// once. Copy them to a temporary buffer here, LMIC_setSession will
// copy them into a buffer of its own again.
uint8_t appskey[sizeof(APPSKEY)];
uint8_t nwkskey[sizeof(NWKSKEY)];
memcpy_P(appskey, APPSKEY, sizeof(APPSKEY));
memcpy_P(nwkskey, NWKSKEY, sizeof(NWKSKEY));
LMIC_setSession (0x1, DEVADDR, nwkskey, appskey);
#else
// If not running an AVR with PROGMEM, just use the arrays directly
LMIC_setSession (0x1, DEVADDR, NWKSKEY, APPSKEY);
#endif

#if defined(CFG_eu868)
// Set up the channels used by the Things Network, which corresponds
// to the defaults of most gateways. Without this, only three base
// channels from the LoRaWAN specification are used, which certainly
// works, so it is good for debugging, but can overload those
// frequencies, so be sure to configure the full frequency range of
// your network here (unless your network autoconfigures them).
// Setting up channels should happen after LMIC_setSession, as that
// configures the minimal channel set.
// NA-US channels 0-71 are configured automatically
LMIC_setupChannel(0, 868100000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(1, 868300000, DR_RANGE_MAP(DR_SF12, DR_SF7B), BAND_CENTI);      // g-band
LMIC_setupChannel(2, 868500000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(3, 867100000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(4, 867300000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(5, 867500000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(6, 867700000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(7, 867900000, DR_RANGE_MAP(DR_SF12, DR_SF7),  BAND_CENTI);      // g-band
LMIC_setupChannel(8, 868800000, DR_RANGE_MAP(DR_FSK,  DR_FSK),  BAND_MILLI);      // g2-band
// TTN defines an additional channel at 869.525Mhz using SF9 for class B
// devices' ping slots. LMIC does not have an easy way to define set this
// frequency and support for class B is spotty and untested, so this
// frequency is not configured here.
#elif defined(CFG_us915)
// NA-US channels 0-71 are configured automatically
// but only one group of 8 should (a subband) should be active
// TTN recommends the second sub band, 1 in a zero based count.
// https://github.com/TheThingsNetwork/gateway-conf/blob/master/US-global_conf.json
LMIC_selectSubBand(1);
#endif

// Disable link check validation
LMIC_setLinkCheckMode(0);

// TTN uses SF9 for its RX2 window.
LMIC.dn2Dr = DR_SF9;

// Set data rate and transmit power for uplink (note: txpow seems to be ignored by the library)
LMIC_setDrTxpow(DR_SF7,14);

// Start job
do_send(&sendjob);

}

void loop() { os_runloop_once(); }

[nootropicdesign]

What hardware are you trying to use this code on? The use of the alternative SPI definition is due to the fact that I built a custom board that did not have the primary SPI pins available, as defined by the Arduino Zero core. You should not need an alternative SPI SERCOM.

[k8zxc]

The schematic of our development board is attached below.

We burned the Arduino Zero bootloader into it. The default SPI pins of zero were:

PA12 D22 / MISO SERCOM2.0 SERCOM4.0 PB10 D23 / MOSI SERCOM4.2 PB11 D24 / SCK SERCOM4.3

and we leave them unconnected. In the schematic, we used the pins 11, 12, and 13 of the Arduino for SPI knowing that muxing of SERCOM is possible.

[nootropicdesign]

Which lmic library are you using? I created a fork that uses a different definition of SPI so that it works with the pins I used: https://github.com/nootropicdesign/arduino-lmic

Why did you comment out the #include of Arduino.h?

I do not know if my definitions of the SPI interface will work with the chip you are using. I used the SAMD21E, not the G.

[k8zxc]

Thank you so much, Sir.