Example of emulation of Nordic NRF905 silicon by Semtech SX1276. Nord…

…ic radio settings does match typical FLARM session

examples/raspi/raw/Makefile

@@ -4,7 +4,7 @@
 # http://www.airspayce.com/mikem/bcm2835/
 
 CC       = g++
-CFLAGS   = -std=c++11 -DRASPBERRY_PI -DBCM2835_NO_DELAY_COMPATIBILITY -D__BASEFILE__=\"$*\"
+CFLAGS   = -g -std=c++11 -DRASPBERRY_PI -DBCM2835_NO_DELAY_COMPATIBILITY -D__BASEFILE__=\"$*\"
 LIBS     = -lbcm2835
 LMICBASE = ../../../src
 INCLUDE  = -I$(LMICBASE) 
@@ -17,6 +17,9 @@ raspi.o: $(LMICBASE)/raspi/raspi.cpp
 radio.o: $(LMICBASE)/lmic/radio.c
 				$(CC) $(CFLAGS) -c $(LMICBASE)/lmic/radio.c $(INCLUDE)
 
+lib_crc.o: lib_crc.c
+				$(CC) $(CFLAGS) -c $(INCLUDE) $<
+
 oslmic.o: $(LMICBASE)/lmic/oslmic.c
 				$(CC) $(CFLAGS) -c $(LMICBASE)/lmic/oslmic.c $(INCLUDE)
 
@@ -32,7 +35,7 @@ aes.o: $(LMICBASE)/aes/lmic.c
 raw.o: raw.cpp
 				$(CC) $(CFLAGS) -c $(INCLUDE) $<
 
-raw: raw.o raspi.o radio.o oslmic.o lmic.o hal.o aes.o
+raw: raw.o raspi.o radio.o lib_crc.o oslmic.o lmic.o hal.o aes.o
 				$(CC) $^ $(LIBS) -o raw
 
 clean:

examples/raspi/raw/lib_crc.h

@@ -0,0 +1,66 @@
+    /*******************************************************************\
+    *                                                                   *
+    *   Library         : lib_crc                                       *
+    *   File            : lib_crc.h                                     *
+    *   Author          : Lammert Bies  1999-2008                       *
+    *   E-mail          : info@lammertbies.nl                           *
+    *   Language        : ANSI C                                        *
+    *                                                                   *
+    *                                                                   *
+    *   Description                                                     *
+    *   ===========                                                     *
+    *                                                                   *
+    *   The file lib_crc.h contains public definitions  and  proto-     *
+    *   types for the CRC functions present in lib_crc.c.               *
+    *                                                                   *
+    *                                                                   *
+    *   Dependencies                                                    *
+    *   ============                                                    *
+    *                                                                   *
+    *   none                                                            *
+    *                                                                   *
+    *                                                                   *
+    *   Modification history                                            *
+    *   ====================                                            *
+    *                                                                   *
+    *   Date        Version Comment                                     *
+    *                                                                   *
+    *   2008-04-20  1.16    Added CRC-CCITT routine for Kermit          *
+    *                                                                   *
+    *   2007-04-01  1.15    Added CRC16 calculation for Modbus          *
+    *                                                                   *
+    *   2007-03-28  1.14    Added CRC16 routine for Sick devices        *
+    *                                                                   *
+    *   2005-12-17  1.13    Added CRC-CCITT with initial 0x1D0F         *
+    *                                                                   *
+    *   2005-02-14  1.12    Added CRC-CCITT with initial 0x0000         *
+    *                                                                   *
+    *   2005-02-05  1.11    Fixed bug in CRC-DNP routine                *
+    *                                                                   *
+    *   2005-02-04  1.10    Added CRC-DNP routines                      *
+    *                                                                   *
+    *   2005-01-07  1.02    Changes in tst_crc.c                        *
+    *                                                                   *
+    *   1999-02-21  1.01    Added FALSE and TRUE mnemonics              *
+    *                                                                   *
+    *   1999-01-22  1.00    Initial source                              *
+    *                                                                   *
+    \*******************************************************************/
+
+
+
+#define CRC_VERSION     "1.16"
+
+
+
+#define FALSE           0
+#define TRUE            1
+
+
+
+unsigned short          update_crc_16(     unsigned short crc, char c                 );
+unsigned long           update_crc_32(     unsigned long  crc, char c                 );
+unsigned short          update_crc_ccitt(  unsigned short crc, char c                 );
+unsigned short          update_crc_dnp(    unsigned short crc, char c                 );
+unsigned short          update_crc_kermit( unsigned short crc, char c                 );
+unsigned short          update_crc_sick(   unsigned short crc, char c, char prev_byte );

examples/raspi/raw/raw.cpp

@@ -14,6 +14,7 @@
 
 #include <lmic.h>
 #include <hal/hal.h>
+#include "lib_crc.h"
 
 #if !defined(DISABLE_INVERT_IQ_ON_RX)
 #error This example requires DISABLE_INVERT_IQ_ON_RX to be set. Update \
@@ -26,16 +27,26 @@
 // 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
+#define TX_INTERVAL 1000 /* 2000 */
+
+// Dragino Raspberry PI hat (no onboard led)
+// see https://github.com/dragino/Lora
+#define RF_CS_PIN  RPI_V2_GPIO_P1_22 // Slave Select on GPIO25 so P1 connector pin #22
+#define RF_IRQ_PIN RPI_V2_GPIO_P1_07 // IRQ on GPIO4 so P1 connector pin #7
+#define RF_RST_PIN RPI_V2_GPIO_P1_11 // Reset on GPIO17 so P1 connector pin #11
 
 // Pin mapping
-const lmic_pinmap lmic_pins = {
-    .nss = 6,
+const lmic_pinmap lmic_pins = { 
+    .nss  = RF_CS_PIN,
     .rxtx = LMIC_UNUSED_PIN,
-    .rst = 5,
-    .dio = {2, 3, 4},
+    .rst  = RF_RST_PIN,
+    .dio  = {RF_IRQ_PIN, LMIC_UNUSED_PIN, LMIC_UNUSED_PIN},
 };
 
+#ifndef RF_LED_PIN
+#define RF_LED_PIN NOT_A_PIN  
+#endif
+
 
 // These callbacks are only used in over-the-air activation, so they are
 // left empty here (we cannot leave them out completely unless
@@ -53,11 +64,32 @@ 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) {
+  u2_t crc16 = 0xffff;  /* seed value */
+
   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.frame[LMIC.dataLen] = 0x31;
+  crc16 = update_crc_ccitt(crc16, LMIC.frame[LMIC.dataLen++]);
+  LMIC.frame[LMIC.dataLen] = 0xFA;
+  crc16 = update_crc_ccitt(crc16, LMIC.frame[LMIC.dataLen++]);
+  LMIC.frame[LMIC.dataLen] = 0xB6;
+  crc16 = update_crc_ccitt(crc16, LMIC.frame[LMIC.dataLen++]);
+
+//  printf("crc16: ");
+  while (*str) {
+    LMIC.frame[LMIC.dataLen] = *str++;
+//    printf("%02x", (u1_t)(LMIC.frame[LMIC.dataLen]));
+    crc16 = update_crc_ccitt(crc16, (u1_t)(LMIC.frame[LMIC.dataLen]));
+    LMIC.dataLen++;
+  }
+//  printf(" : %x\n", crc16);
+
+  LMIC.frame[LMIC.dataLen++] = (crc16 >>  8) & 0xFF;
+  LMIC.frame[LMIC.dataLen++] = (crc16      ) & 0xFF;
+
   LMIC.osjob.func = func;
   os_radio(RADIO_TX);
   Serial.println("TX");
@@ -69,7 +101,7 @@ void rx(osjobcb_t 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);
+  os_radio(RADIO_RX /* RADIO_RXON */);
   Serial.println("RX");
 }
 
@@ -78,6 +110,10 @@ static void rxtimeout_func(osjob_t *job) {
 }
 
 static void rx_func (osjob_t* job) {
+
+  u2_t crc16 = 0xffff;  /* seed value */
+  u1_t i;
+
   // Blink once to confirm reception and then keep the led on
   digitalWrite(LED_BUILTIN, LOW); // off
   delay(10);
@@ -93,64 +129,97 @@ static void rx_func (osjob_t* job) {
   Serial.print("Got ");
   Serial.print(LMIC.dataLen);
   Serial.println(" bytes");
-  Serial.write(LMIC.frame, LMIC.dataLen);
-  Serial.println();
+
+  u4_t address = (LMIC.frame[0] << 16) | (LMIC.frame[1] << 8) | LMIC.frame[2] ;
+  if (address == 0x31FAB6)
+  {
+
+    for (i=0; i<(LMIC.dataLen-2); i++)
+    {
+      printf("%02x", (u1_t)(LMIC.frame[i]));
+      crc16 = update_crc_ccitt(crc16, (u1_t)(LMIC.frame[i]));
+    }
+    u2_t pkt_crc = (LMIC.frame[i] << 8 | LMIC.frame[i+1]);
+    if (crc16 == pkt_crc ) {
+      printf(" %04x is valid crc", pkt_crc);
+    } else {
+      printf(" %04x is wrong crc", pkt_crc);
+    }
+
+  } else {
+      printf(" %06x is wrong address", address);
+  }
+  Serial.println();  
 
   // Restart RX
   rx(rx_func);
 }
 
 static void txdone_func (osjob_t* job) {
+//  printf("txdone_func\n");
   rx(rx_func);
 }
 
 // log text to USART and toggle LED
 static void tx_func (osjob_t* job) {
   // say hello
-  tx("Hello, world!", txdone_func);
+  //tx("Hello, world!", txdone_func);
+  tx("\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001", 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() {
+int setup() {
   printf("Starting\n");
 
+  // Init GPIO bcm
+  if (!bcm2835_init()) {
+      fprintf( stderr, "bcm2835_init() Failed\n\n" );
+      return 1;
+  }
+//  printf("Starting 1\n");
   pinMode(LED_BUILTIN, OUTPUT);
 
   // initialize runtime env
   os_init();
-
+//  printf("Starting 2\n");
   // 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;
+  LMIC.freq = 868400000;
 #elif defined(CFG_us915)
   LMIC.freq = 902300000;
 #endif
 
   // Maximum TX power
-  LMIC.txpow = 27;
+  LMIC.txpow = 5;
   // 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;
+  LMIC.datarate =  DR_FSK /*  DR_SF9  */ ;
+  //LMIC.datarate =  DR_SF9 ;
   // This sets CR 4/5, BW125 (except for DR_SF7B, which uses BW250)
   LMIC.rps = updr2rps(LMIC.datarate);
 
   printf("Started\n");
 
   // setup initial job
   os_setCallback(&txjob, tx_func);
+
+  return 0;
 }
 
 int main(void) {
 
-  setup();
-
+  if (setup())
+    return 1;
+
+  printf("Loop\n");
+
   while(1) {
     // execute scheduled jobs and events
     os_runloop_once();

examples/raspi/spi_scan/spi_scan.c

@@ -75,7 +75,7 @@ int main(int argc, char **argv)
   } else {
     // List of all CS line where module can be connected
     // GPIO6, GPIO8/CE0, GPIO7/CE1, GPIO26
-    uint8_t CS_pins[] = {6, 7, 8, 26};
+    uint8_t CS_pins[] = {6, 7, 8, 25};
     uint8_t i;
 
     // Init SPI

src/lmic/config.h

@@ -63,7 +63,7 @@
 // hear gateways). This should probably only be used when debugging
 // and/or when talking to the radio directly (e.g. like in the "raw"
 // example).
-//#define DISABLE_INVERT_IQ_ON_RX
+#define DISABLE_INVERT_IQ_ON_RX
 
 // This allows choosing between multiple included AES implementations.
 // Make sure exactly one of these is uncommented.

src/lmic/oslmic.c

@@ -20,8 +20,11 @@ static struct {
 void os_init () {
     memset(&OS, 0x00, sizeof(OS));
     hal_init();
+//printf("1 ***\n");
     radio_init();
+//printf("2 ***\n");
     LMIC_init();
+//printf("3 ***\n");
 }
 
 ostime_t os_getTime () {
@@ -103,7 +106,7 @@ void os_runloop_once() {
         hal_sleep(); // wake by irq (timer already restarted)
     }
     hal_enableIRQs();
-    if(j) { // run job callback
-        j->func(j);
+    if(j && j->func) { // run job callback
+          j->func(j);
     }
 }