Sample NordicSemicondictor nRF52 beacon discovery for CO657 (University of Kent, UK); builds on mbed-os, derived from LEDBeacon sample code (on github). Writes out beacons recently seen to serial port and/or LCD (#ifdef job) on the MBED application shield.
main.cpp
- Committer:
- co657_frmb
- Date:
- 2016-10-27
- Revision:
- 0:f4e27396137e
- Child:
- 1:7986f9873e20
File content as of revision 0:f4e27396137e:
/* * main.cpp -- test program to _simply_ detect iBeacons (and anything else advertising in a similar way) * Fred Barnes, October 2016 */ /* NOTE: based heavily on mbed-os-example-ble's BLE_LEDBlinker example (trimmed down) */ /* Further note: this is a hack in places */ #include "mbed.h" #include "ble/BLE.h" #include "ble/Gap.h" #include "C12832.h" /* output choice */ #undef SERIAL_OUTPUT #define LCD_OUTPUT static DigitalOut led1 (LED1); static DigitalOut led2 (LED2); static DigitalOut led3 (LED3); static DigitalOut led4 (LED4); #ifdef SERIAL_OUTPUT static Serial host (USBTX, USBRX); #endif #ifdef LCD_OUTPUT static C12832 shld_lcd (D11, D13, D12, D7, D10); /* LCD on the shield (128x32) */ #endif #define HLEN_MAX (128) typedef struct beacon_log { uint8_t age; /* approx seconds (0xff == dead/gone) */ uint16_t addr_hi; /* two high order bytes */ uint32_t addr_lo; /* four low order bytes */ int8_t rssi; /* RSSI (-ve) */ uint8_t type; /* crudely cast */ } beacon_log_t; #define MAX_BEACONS (32) static beacon_log_t blog[MAX_BEACONS]; void bubble_blog (int idx) { beacon_log_t tmp; /* crude bubble-sort for single insert/update */ if (idx <= 0) { return; } memcpy (&tmp, &blog[idx], sizeof (beacon_log_t)); while ((idx > 0) && (blog[idx-1].age > tmp.age)) { memcpy (&blog[idx], &blog[idx-1], sizeof (beacon_log_t)); idx--; } memcpy (&blog[idx], &tmp, sizeof (beacon_log_t)); return; } void age_blog (void) { int i; for (i=0; i<MAX_BEACONS; i++) { if (blog[i].age == 0xff) { break; } blog[i].age++; } return; } #ifdef LCD_OUTPUT void draw_blog (void) { shld_lcd.cls (); for (int i=0; (i<3) && (blog[i].age != 0xff); i++) { shld_lcd.locate (0, (i * 10)); shld_lcd.printf ("%4.4X%8.8X", blog[i].addr_hi, blog[i].addr_lo); shld_lcd.locate (72, (i * 10)); shld_lcd.printf ("%d", blog[i].rssi); shld_lcd.locate (96, (i * 10)); shld_lcd.printf ("%u", blog[i].type); shld_lcd.locate (108, (i * 10)); shld_lcd.printf ("%u", blog[i].age); } shld_lcd.copy_to_lcd (); return; } #endif void scan_advert_got (const Gap::AdvertisementCallbackParams_t *params) { int i, last; uint32_t a_lo; uint16_t a_hi; int newb = 0; a_hi = ((uint16_t)params->peerAddr[5] << 8) | (uint16_t)params->peerAddr[4]; a_lo = ((uint32_t)params->peerAddr[3] << 24) | ((uint32_t)params->peerAddr[2] << 16) | ((uint32_t)params->peerAddr[1] << 8) | (uint32_t)params->peerAddr[0]; /* scribble the data into the log */ for (i=0, last=-1; i<MAX_BEACONS; i++) { /* see if we match */ if (blog[i].age == 0xff) { last = i; break; } else if ((blog[i].addr_hi == a_hi) && (blog[i].addr_lo == a_lo)) { /* this one! */ break; } } if (last >= 0) { /* new(ish) beacon */ i = last; newb = 1; } else if ((i == MAX_BEACONS) && (last < 0)) { /* ran out of room searching for slot, use last */ i = MAX_BEACONS - 1; newb = 1; } /* else found it somewhere, just reset age */ if (newb) { blog[i].addr_hi = a_hi; blog[i].addr_lo = a_lo; blog[i].type = (uint8_t)params->type; } blog[i].rssi = (int8_t)params->rssi; blog[i].age = 0; bubble_blog (i); #ifdef SERIAL_OUTPUT host.printf ("ADV:"); for (i=Gap::ADDR_LEN - 1; i>=0; i--) { // backwards host.printf ("%2.2x", params->peerAddr[i]); } host.printf (":%d:%u:%d:", params->rssi, (unsigned int)params->type, params->advertisingDataLen); for (i=0; (i<params->advertisingDataLen) && (hlen < (HLEN_MAX-4)); i++) { uint8_t ch = (uint8_t)params->advertisingData[i]; host.printf ("%2.2x", ch); } host.printf ("\r\n"); #endif #ifdef LCD_OUTPUT draw_blog (); #endif return; } #define SCAN_INTERVAL (20) #define SCAN_WINDOW (20) void ble_init_done (BLE::InitializationCompleteCallbackContext *params) { BLE &ble = params->ble; ble_error_t err = params->error; if (err != BLE_ERROR_NONE) { #ifdef SERIAL_OUTPUT host.printf ("ERR:Failed to initialise BLE, error code %d\r\n", (int)err); #endif return; } if (ble.getInstanceID () != BLE::DEFAULT_INSTANCE) { // erm.. return; } // setup for scanning err = ble.gap().setScanInterval (SCAN_INTERVAL); if (err != BLE_ERROR_NONE) { #ifdef SERIAL_OUTPUT host.printf ("ERR:Failed to set scanning interval (%d), code %d\r\n", SCAN_INTERVAL, (int)err); #endif return; } err = ble.gap().setScanWindow (SCAN_WINDOW); if (err != BLE_ERROR_NONE) { #ifdef SERIAL_OUTPUT host.printf ("ERR:Failed to set scanning window (%d), code %d\r\n", SCAN_WINDOW, (int)err); #endif return; } err = ble.gap().setScanTimeout (0); if (err != BLE_ERROR_NONE) { #ifdef SERIAL_OUTPUT host.printf ("ERR:Failed to set scan timeout (0), code %d\r\n", (int)err); #endif return; } err = ble.gap().setActiveScanning (false); if (err != BLE_ERROR_NONE) { #ifdef SERIAL_OUTPUT host.printf ("ERR:Failed to set active scan (false), code %d\r\n", (int)err); #endif return; } #ifdef SERIAL_OUTPUT host.printf ("MSG:Scan parameters set, off we go..\r\n"); #endif // Thread::wait (500); err = ble.gap().startScan (scan_advert_got); if (err != BLE_ERROR_NONE) { #ifdef SERIAL_OUTPUT host.printf ("ERR:Failed to start scanning (code %d)\r\n", (int)err); #endif return; } return; } // main() runs in its own thread in the OS // (note the calls to Thread::wait below for delays) int main() { BLE& ble = BLE::Instance(BLE::DEFAULT_INSTANCE); uint8_t lw = 0x01; int acnt = 0; #ifdef SERIAL_OUTPUT host.baud (38400); #endif led1 = 1; led2 = 0; led3 = 0; led4 = 0; for (int i=0; i<MAX_BEACONS; i++) { memset (&blog[i], 0x00, sizeof (beacon_log_t)); blog[i].age = 0xff; } /* Note: most of the real initialisation is done inside "ble_init_done" */ ble.init (ble_init_done); #ifdef LCD_OUTPUT shld_lcd.set_auto_up (0); shld_lcd.cls (); shld_lcd.locate (1, 1); shld_lcd.printf ("Hello, CO657!"); shld_lcd.copy_to_lcd (); Thread::wait (500); #endif // GROT for (;;) { led1 = (lw & 0x01) ? 0 : 1; led2 = (lw & 0x02) ? 0 : 1; led4 = (lw & 0x04) ? 0 : 1; led3 = (lw & 0x08) ? 0 : 1; lw <<= 1; if (lw == 0x10) { lw = 0x01; } acnt++; if (acnt == 10) { acnt = 0; age_blog (); #ifdef LCD_OUTPUT draw_blog (); #endif } ble.processEvents (); Thread::wait (100); } }