Eric Tsai
nRF51822 BLE project for TMP102 temperature sensor
Dependencies: BLE_API TMP102 mbed nRF51822
main.cpp
- Committer:
- electronichamsters
- Date:
- 2017-10-07
- Revision:
- 12:16b368795079
- Parent:
- 11:4f925834167d
File content as of revision 12:16b368795079:
/*
* Copyright (c) Eric Tsai 2017
*
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*
* Credit: started with the basic BLE Temperature Beacon code from mbed Bluetooth Low Energy team
* https://developer.mbed.org/teams/Bluetooth-Low-Energy/code/BLE_TemperatureBeacon/file/0a8bbb6dea16/main.cpp
*
* Reports TMP102 temperature sensor as advertisement.
*
* BLE sensor as Beacon advertisements. Intended to function with specific BLE observer.
* Tested on nRF51822 targets on mbed.
* keywords: todo, tochange
*
*
*/
extern "C"
{
#include "nrf_ecb.h" //required to call the ecb functions for encryption
}
#include "mbed.h"
#include "toolchain.h"
#include "ble/BLE.h"
//#include "TMP_nrf51/TMP_nrf51.h"
#include "TMP102.h" //https://developer.mbed.org/users/chris/code/TMP102/
/*******************************************************************************************
* START tochange: items that may need customization depending on sensors, hardware, and desired behavior
*******************************************************************************************/
const uint16_t Periodic_Update_Seconds = 30; //number of seconds between periodic I/O status re-transmits 900s =15 min.
#define MyDebugEnb 0 //enables serial output for debug, consumes ~1mA when idle
uint8_t magnet_near=0; //this I/O, specifically for reed switch sensor
TMP102 tempI2C(p11, p9, 0x90); //sda on p11, scl on p9 for bart board easy pin alignment
//TMP102 tempI2C(p9, p11, 0x90); //sda on p0, scl on p1, taking over uart for purple board
/* hardware interrupt pins, selected based on hardware
*Syntax: Pin "P0.4" on nRF51822 documentation is mbed "p4".
* InterruptIn is pulled-up. GND the pin to activate.
*/
//InterruptIn button1(p0); //nRF51822 P0.0
//InterruptIn button2(p1); //nRF51822 P0.1
/******************************************************************************************
* END tochange
*******************************************************************************************/
#if MyDebugEnb
// if you see ~1mA consumption during sleep, that's because MyDebugEnb==1, it's enabled.
Serial device(p9, p11); //nRF51822 uart : TX=p9. RX=p11
#endif
static Ticker Tic_Stop_Adv; //used to stop advertising after X seconds
static Ticker Tic_Debounce; //debounce I/O
static Ticker Tic_Periodic; //transmit sensor data on a periodic basis outside I/O events
const uint16_t Periodicity = 1800; //birthday periodicity used for spoof checking, must match gateway. Should be 1800 seconds for 30minutes
static Timer Tmr_From_Birthday; //holds number of seconds since birthday, for spoof detection
static Ticker Tic_Birthday; //resets Tmr_From_Birthday every Periodicity seconds, for spoof detection
static bool Flag_Update_IO = false; //flag to indicate event is hardware interrupt
static bool Flag_Periodic_Call = false; //flag to indicate event is periodic callback
static bool Flag_Detach_Adv_Tic = false; //flag to stop advertising
/* Optional: Device Name, add for human read-ability */
const static char DEVICE_NAME[] = "LOL";
//Advertisement Data
//note: AdvData[] holds bytes [5] to byte [30] of entire advertising data. The user content part after ADV flag and header
static uint8_t AdvData[] = {0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0}; //26 Bytes manufacturer specific data
char buffer[10]={0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; //hold I/O reading json
char bat_volt_char[6] = {0, 0, 0, 0, 0, 0}; //hold json for battery reading
uint8_t Adv_First_Section[10]; //holds the first several bytes with a pattern indicating this sensor is "one of ours"
uint8_t mac_reverse[6] = {0x0,0x0,0x0,0x0,0x0,0x0}; //mac address for this module
char temp_char[6] = {0, 0, 0, 0, 0, 0}; //hold json for temperature
/***** Advertisement structure is 31 Bytes ****************
https://docs.mbed.com/docs/ble-intros/en/latest/Advanced/CustomGAP/
Full Advertisement:
First 5 bytes are set by stack according to flag and header parameters.
Last 26 bytes are user data
-- tabbed --
Byte 0 | AD1 Length | 0x02 | AD1 is 2 bytes long
Byte 1 | AD1 Type | 0x01 | AD1 Data interpreted as flag
Byte 2 | AD1 Data 0 | 0x06 | AD1 Data flag mean "00000110"
Byte 3 | AD2 Length | 0x1B | AD2 is 27 bytes (0x1B) long (rest of this data)
Byte 4 | AD2 Type | 0xFF | 0xFF mean Manufacturer Specific Data
Byte 5 | AD2 Data 0 | ADV_Data[0] | "our device" flag, MAC[3]
Byte 6 | AD2 Data 1 | ADV_Data[1] | "out device" flag, MAC[2]
Byte 7 | AD2 Data 2 | ADV_Data[2] | "out device" flag, MAC[1]
Byte 8 | AD2 Data 3 | ADV_Data[3] | "out device" flag, MAC[0]
Byte 9 | AD2 Data 4 | ADV_Data[4] | battery voltage json MSB, ie 3 in 3.14
Byte 10 | AD2 Data 5 | ADV_Data[5] | battery voltage json
Byte 11 | AD2 Data 6 | ADV_Data[6] | battery voltage json
Byte 12 | AD2 Data 7 | ADV_Data[7] | battery voltage json LSB, ie 4 in 3.14
Byte 13 | AD2 Data 8 | ADV_Data[8] | reserved
Byte 14 | AD2 Data 9 | ADV_Data[9] | reserved
Byte 15 | AD2 Data 10 | ADV_Data[10] Encrypted | spoof - clock high byte, range 0 to 1800 seconds
Byte 16 | AD2 Data 11 | ADV_Data[11] Encrypted | spoof - clock low byte
Byte 17 | AD2 Data 12 | ADV_Data[12] Encrypted | Xmit_Cnt - increments per transmit event, 0-255
Byte 18 | AD2 Data 13 | ADV_Data[13] Encrypted | JSON[0]
Byte 19 | AD2 Data 14 | ADV_Data[14] Encrypted | JSON[1]
Byte 20 | AD2 Data 15 | ADV_Data[15] Encrypted | JSON[2]
Byte 21 | AD2 Data 16 | ADV_Data[16] Encrypted | JSON[3]
Byte 22 | AD2 Data 17 | ADV_Data[17] Encrypted | JSON[4]
Byte 23 | AD2 Data 18 | ADV_Data[18] Encrypted | JSON[5]
Byte 24 | AD2 Data 19 | ADV_Data[19] Encrypted | JSON[6]
Byte 25 | AD2 Data 20 | ADV_Data[20] Encrypted | JSON[7]
Byte 26 | AD2 Data 21 | ADV_Data[21] Encrypted | JSON[8]
Byte 27 | AD2 Data 22 | ADV_Data[22] Encrypted | JSON[9]
Byte 28 | AD2 Data 23 | ADV_Data[23] Encrypted | JSON[10]
Byte 29 | AD2 Data 24 | ADV_Data[24] Encrypted | JSON[11]
Byte 30 | AD2 Data 25 | ADV_Data[25] Encrypted | JSON[12]
***************************************************/
static uint8_t key[16] = {0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4};
//26 bytes adv data
static uint8_t encrypted[26] = {0x0,0x0,0x0,0x1,0x1,0x1,0x2,0x2,0x2,0x3,0x3,0x3,0x4,0x4,0x4,0x5,0x5,0x5,0x6,0x6,0x6,0x7,0x7,0x7,0x8,0x8}; /* Example of hex data */
//static uint8_t key_buf[16] = {0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4};
static uint8_t key_buf[16] = {0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x1, 0x2};
static uint8_t src_buf[16] = {0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4};
static uint8_t des_buf[16] = {0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4,0x1,0x2,0x3,0x4};
uint8_t Xmit_Cnt = 1;
/* **** NOT USED **** */
//16byte UUID loading happens here
//Look at <GapAdvertisingData.h> for rest of definition
struct ApplicationData_t {
//Byte 0: AppID High Byte
//Byte 1: AppID Low Byte
//Byte 2: sensor High Word
//Byte 3:
//Byte 4:
//Byte 5: sensor Low Byte
//app ID is 16 bit, (0xFEFE)
uint16_t applicationSpecificId; /* An ID used to identify temperature value in the manufacture specific AD data field */
//TMP_nrf51::TempSensorValue_t tmpSensorValue; /* this is a float (32-bit), user data */
} PACKED;
void debounce_Callback(void)
{
Tic_Debounce.detach();
Flag_Update_IO = true; //start advertising
/* Note that the buttonPressedCallback() executes in interrupt context, so it is safer to access
* BLE device API from the main thread. */
}
/*
//ISR for I/O interrupt
void buttonPressedCallback(void)
{
Tic_Debounce.attach(debounce_Callback, 1); //ok to attach multiple times, recent one wins
}
//ISR for I/O interrupt
void buttonReleasedCallback(void)
{
Tic_Debounce.attach(debounce_Callback, 1);
}
*/
void stop_adv_Callback(void)
{
//stops advertising after X seconds
/* Note that the Callback() executes in interrupt context, so it is safer to do
* heavy-weight sensor polling from the main thread (where we should be able to block safely, if needed). */
Flag_Detach_Adv_Tic = true;
}
/* ****************************************
* Decides what actions need to be performed on periodic basis
*******************************************/
void periodic_Callback(void)
{
Flag_Update_IO = true;
Flag_Periodic_Call = true;
}
/* ****************************************
* No RTC available, tickers only have a 35 minute range.
* So periodicity for spoof avoidance is set to 30 minutes
*******************************************/
void clock_reset_Callback(void)
{
#if MyDebugEnb
device.printf("===== reset timer =====");
device.printf("\r\n");
#endif
Tmr_From_Birthday.reset();
};
void setupApplicationData(ApplicationData_t &appData)
{
// two byte ID: 0xFEFE
static const uint16_t APP_SPECIFIC_ID_TEST = 0xFEFE; //2 byte application ID
appData.applicationSpecificId = APP_SPECIFIC_ID_TEST;
}
/**
* This function is called when the ble initialization process has failled
*/
void onBleInitError(BLE &ble, ble_error_t error)
{
/* Initialization error handling should go here */
}
/**
* Callback triggered when the ble initialization process has finished
*/
void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
{
BLE& ble = params->ble;
ble_error_t error = params->error;
if (error != BLE_ERROR_NONE) {
/* In case of error, forward the error handling to onBleInitError */
onBleInitError(ble, error);
return;
}
/* Ensure that it is the default instance of BLE */
if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
return;
}
/* Set device name characteristic data */
ble.gap().setDeviceName((const uint8_t *) DEVICE_NAME);
/* Setup advertising payload */
//set modes "no EDR", "discoverable" for beacon type advertisements
ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
//from GAP example
/* Sacrifice 2B of 31B to AdvType overhead, rest goes to AdvData array you define */
ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, AdvData, sizeof(AdvData));
/* Setup advertising parameters: not connectable */
ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_NON_CONNECTABLE_UNDIRECTED);
ble.gap().setAdvertisingInterval(900); //one advertisment every 300ms. Self tickers, so you don't have to worry.
}
//not needed anymore
void my_analogin_init(void)
{
NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
(ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
//(ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
(ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
(ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) |
//(ADC_CONFIG_PSEL_AnalogInput4 << ADC_CONFIG_PSEL_Pos) |
(ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
}
/* ****************************************
* Read battery voltage using bandgap reference
* shunt Vdd to ADC, thanks to Marcelo Salazar's notes here:
* https://developer.mbed.org/users/MarceloSalazar/notebook/measuring-battery-voltage-with-nordic-nrf51x/
*******************************************/
uint16_t read_bat_volt(void)
{
//10 bit resolution, route Vdd as analog input, set ADC ref to VBG band gap
//disable analog pin select "PSEL" because we're using Vdd as analog input
//no external voltage reference
NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
(ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
//(ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
(ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
(ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) |
//(ADC_CONFIG_PSEL_AnalogInput4 << ADC_CONFIG_PSEL_Pos) |
(ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
//NRF_ADC->CONFIG &= ~ADC_CONFIG_PSEL_Msk;
//NRF_ADC->CONFIG |= ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos;
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
NRF_ADC->TASKS_START = 1;
//while loop doesn't actually loop until reading comlete, use a wait.
while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {};
wait_ms(1);
//save off RESULT before disabling.
//uint16_t myresult = (uint16_t)NRF_ADC->RESULT;
//disable ADC to lower bat consumption
NRF_ADC->TASKS_STOP = 1;
//NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Disabled; //disable to shutdown ADC & lower bat consumption
return (uint16_t)NRF_ADC->RESULT; // 10 bit
//return myresult;
} //end read_bat_volt
/* ****************************************
* Read battery voltage using bandgap reference
* shunt analog pin to ADC, from API here
* https://developer.mbed.org/users/mbed_official/code/mbed-src/file/cb4253f91ada/targets/hal/TARGET_NORDIC/TARGET_NRF51822/analogin_api.c
*******************************************/
uint16_t read_ADC_pin(void)
{
//10 bit resolution, route PSEL pin as 1/3 input sel,
//set ADC ref to VBG band gap
//set AnalogInput4 as input pin (this is P0.03)
//no external voltage reference
NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
//(ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
(ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
(ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
//ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) |
(ADC_CONFIG_PSEL_AnalogInput4 << ADC_CONFIG_PSEL_Pos) |
(ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
//set pin select to AnalogInput4 = pin 7 = p0.03 = AIN4
//NRF_ADC->CONFIG &= ~ADC_CONFIG_PSEL_Msk;
//NRF_ADC->CONFIG |= ADC_CONFIG_PSEL_AnalogInput4 << ADC_CONFIG_PSEL_Pos;
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
NRF_ADC->TASKS_START = 1;
//while loop doesn't actually loop until reading comlete, use a wait.
while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {};
wait_ms(1); //needed because busy while loop doesn't run.
//save off RESULT before disabling.
//uint16_t myresult = (uint16_t)NRF_ADC->RESULT;
//disable ADC to lower bat consumption
//NRF_ADC->TASKS_STOP = 1;
//NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Disabled; //disable to shutdown ADC & lower bat consumption
return (uint16_t)NRF_ADC->RESULT; // 10 bit
//return myresult;
} //end read_ADC_pin
/* ****************************************
* Pattern scheme indicating "one of ours"
* generate first part of ADV data so that observer can recognize it as "one of ours".
* use specific schema to decide how we're recognizing our sensor ADV
*******************************************/
void hash_first_section(uint8_t * dest, const uint8_t * mac_addr, const char * bat_volt_str)
{
dest[0] = mac_addr[3];
dest[1] = mac_addr[2];
dest[2] = mac_addr[1];
dest[3] = mac_addr[0];
dest[4] = bat_volt_str[0];
dest[5] = bat_volt_str[1];
dest[6] = bat_volt_str[2];
dest[7] = bat_volt_str[3];
dest[8] = 0x10;
dest[9] = 0x11;
#if MyDebugEnb
device.printf("hash array: ");
for (int i=0; i<10; i++)
{
device.printf("%x ", dest[i]);
}
device.printf("\r\n");
#endif
}
/* ****************************************
*
* Main Loop
*
*******************************************/
int main(void)
{
#if MyDebugEnb
device.baud(9600);
device.printf("started sensor node 36 ");
device.printf("\r\n");
#endif
Tmr_From_Birthday.start(); //tracks # sec since birthday
BLE &ble = BLE::Instance();
ble.init(bleInitComplete);
float bat_reading; //hold battery voltage reading (Vbg/Vcc)
my_analogin_init();//routes band-gap to analog input
/* SpinWait for initialization to complete. This is necessary because the
* BLE object is used in the main loop below. */
while (ble.hasInitialized() == false) { /* spin loop */ }
//every X seconds, sends period update, up to 1800 (30 minutes)
Tic_Periodic.attach(periodic_Callback, Periodic_Update_Seconds); //send updated I/O every x seconds
Tic_Birthday.attach(clock_reset_Callback, Periodicity); //clock algorithm periodicity
ble.getAddress(0,mac_reverse); //last byte of MAC (as shown on phone app) is at mac[0], not mac[6];
#if MyDebugEnb
device.printf("mac = ");
for (int i=0; i<6; i++) //prints out MAC address in reverse order; opps.
{
device.printf("%x:", mac_reverse[i]);
}
device.printf("\r\n");
#endif
while (true)
{ //Main Loop
uint16_t seconds_Old =(uint16_t)(Tmr_From_Birthday.read_ms()/1000); // 0-1800 seconds (30 minutes)
#if MyDebugEnb
device.printf("current time in seconds: %d \r\n", seconds_Old);
#endif
/* comment out button interrupts
//set both pins to pull-up, so they're not floating when we read state
button1.mode(PullUp);
button2.mode(PullUp);
//expect either button1 or button2 is grounded, b/c using SPDT reed switch
//the "common" pin on the reed switch should be on GND
uint8_t button1_state = button1.read();
uint8_t button2_state = button2.read();
//let's just update the pins on every wake. Insurance against const drain.
//if state == 0, pin is grounded. Unset interrupt and float pin, set the other pin for ISR
if ( (button1_state == 0) && (button2_state == 1) )
{
magnet_near = 1;
//button1.disable_irq() //don't know if disables IRQ on port or pin
button1.fall(NULL); //disable interrupt
button1.rise(NULL); //disable interrupt
button1.mode(PullNone); //float pin to save battery
//button2.disable_irq() //don't know if disables IRQ on port or pin
button2.fall(buttonReleasedCallback); //enable interrupt
button2.rise(buttonReleasedCallback); //enable interrupt
button2.mode(PullUp); //pull up on pin to get interrupt
#if MyDebugEnb
device.printf("=== button 1! %d seconds=== \r\n", seconds_Old);
#endif
} //end if button2
else if ( (button1_state == 1) && (button2_state == 0) ) //assume other pin is open circuit
{
magnet_near = 0;
//button1.disable_irq() //don't know if disables IRQ on port or pin
button1.fall(buttonReleasedCallback); //enable interrupt
button1.rise(buttonReleasedCallback); //enable interrupt
button1.mode(PullUp); //pull up on pin to get interrupt
//button2.disable_irq() //don't know if disables IRQ on port or pin
button2.fall(NULL); //disable interrupt
button2.rise(NULL); //disable interrupt
button2.mode(PullNone); //float pin to save battery
#if MyDebugEnb
device.printf("=== button 2! === %d seconds\r\n", seconds_Old);
#endif
} //end if button1
else //odd state, shouldn't happen, suck battery and pullup both pins
{
magnet_near = 2;
//AdvData[4] = 0x33;
//button1.disable_irq() //don't know if disables IRQ on port or pin
button1.fall(buttonReleasedCallback); //disable interrupt
button1.rise(buttonReleasedCallback); //disable interrupt
button1.mode(PullUp); //float pin to save battery
//button2.disable_irq() //don't know if disables IRQ on port or pin
button2.fall(buttonReleasedCallback); //disable interrupt
button2.rise(buttonReleasedCallback); //disable interrupt
button2.mode(PullUp); //float pin to save battery
#if MyDebugEnb
device.printf("no buttons!! %d seconds\r\n", seconds_Old);
#endif
} //end odd state
**** end comment out button interrupts */
if (Flag_Update_IO) {
/* Do blocking calls or whatever hardware-specific action is
* necessary to poll the sensor. */
//call attach again on periodic update to reset ticker
//next periodic updates happens Perioidc_Update_Seconds after I/O events
Tic_Periodic.attach(periodic_Callback, Periodic_Update_Seconds);
Xmit_Cnt++; //increment transmit counter when updating I/O
//read and convert battery voltage
bat_reading = (float)read_bat_volt();
bat_reading = (bat_reading * 3.6) / 1024.0;
#if MyDebugEnb
device.printf("bat reading: %f \r\n", bat_reading);
#endif
//write battery voltage
uint8_t total_chars;
memset(&bat_volt_char[0], 0, sizeof(bat_volt_char)); //clear out buffer
//convert battery voltage float value to string reprsentation to 2 decimal places, and save the size of string.
total_chars = sprintf (bat_volt_char, "%.2f", bat_reading);
//read and convert analog voltage. Comment out this section if note needed, saves some battery
NRF_ADC->TASKS_STOP = 1;
float analogreading;
analogreading = (float)read_ADC_pin();
analogreading = (analogreading * 3.6) / 1024.0;
#if MyDebugEnb
device.printf("separate analog reading: %.02f \r\n", analogreading);
#endif
//disable ADC to save power
NRF_ADC->TASKS_STOP = 1;
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Disabled; //disable to shutdown ADC & lower bat consumption
//read temperature of TMP102
float temp = tempI2C.read(); //returns celcius
temp = temp*((float)9.0/5.0) + 32; //convert to Farenheit
uint8_t total_chars_temp;
memset(&temp_char[0], 0, sizeof(temp_char)); //clear out buffer
total_chars_temp = sprintf (temp_char, "%.2f", temp);
#if MyDebugEnb
device.printf("char buff: %c%c%c%c \r\n", bat_volt_char[0], bat_volt_char[1], bat_volt_char[2], bat_volt_char[3]);
device.printf("num chars: %d \r\n", total_chars);
#endif
//Generate "First Section" for ADV_Data so gateway will recognize our advertisement pattern
hash_first_section(Adv_First_Section, mac_reverse, bat_volt_char);
/* ****************************************
* start writing out ADVData array
* todo: this is easy to write but hard to read. Maybe make it easy to read and hard to write?
******************************************/
memset(&AdvData[0], 0, sizeof(AdvData));
uint8_t JSON_loc=0; //AdvData[0]
AdvData[0] = Adv_First_Section[0]; //"our device" flag, MAC[3]
JSON_loc++; //JSON_loc == 1
AdvData[1] = Adv_First_Section[1]; //"out device" flag, MAC[2]...
JSON_loc++; //JSON_loc == 2
AdvData[2] = Adv_First_Section[2];
JSON_loc++; //JSON_loc == 3
AdvData[3] = Adv_First_Section[3];
JSON_loc++; //JSON_loc == 4
AdvData[4] = Adv_First_Section[4];
JSON_loc++; //JSON_loc == 5
AdvData[5] = Adv_First_Section[5];
JSON_loc++; //JSON_loc == 6
AdvData[6] = Adv_First_Section[6];
JSON_loc++;
AdvData[7] = Adv_First_Section[7];
JSON_loc++;
AdvData[8] = Adv_First_Section[8];
JSON_loc++;
AdvData[9] = Adv_First_Section[9];
JSON_loc++;
#if MyDebugEnb
device.printf("ADV first 10 array: ");
for (int i=0; i<10; i++)
{
device.printf("%x ", AdvData[i]);
}
device.printf("\r\n");
#endif
JSON_loc = 10;
//Start of encrypted user data
//[10] and [11] hold 2 bytes for how many seconds since birthday, little endian
AdvData[10] = seconds_Old & 0xFF;
JSON_loc++;
AdvData[11] = (seconds_Old >> 8) & 0xFF;
JSON_loc++;
AdvData[12] = Xmit_Cnt;
JSON_loc++;
//start of jason data
//"mag":
JSON_loc = 13;
AdvData[JSON_loc] = 0x22; //ADV_Data[13] = "
JSON_loc++; //14
AdvData[JSON_loc] = 'T'; //ADV_Data[14]
JSON_loc++; //15
AdvData[JSON_loc] = 'M'; //ADV_Data[15]
JSON_loc++; //16
AdvData[JSON_loc] = 'P'; //ADV_Data[16]
JSON_loc++; //17
//for periodic calls, we want to add an extra mqtt level "p", using "/p"
//to delineate between MQTT publishes from real world I/O interrupts vs timer interrupts
if (Flag_Periodic_Call)
{
AdvData[JSON_loc] = 0x2f; // ADV_Data[17] = /
JSON_loc++; //18
AdvData[JSON_loc] = 0x70; // ADV_Data[18] =p
JSON_loc++; //19
}
AdvData[JSON_loc] = 0x22; //ADV_Data[17 or 19] = "
JSON_loc++; //20
AdvData[JSON_loc] = 0x3a; //ADV_Data[18 or 20] = :
JSON_loc++; //21
//convert magnet variable to string, for magnet sensor, this is easy
//since we only have 1 or 0, but this also works for analog values
/*
memset(&buffer[0], 0, sizeof(buffer)); //clear out buffer
total_chars = sprintf (buffer, "%d", magnet_near); //returns total number of characters, which is 1 character.
for (int i=0; i < total_chars; i++)
{
AdvData[JSON_loc] = buffer[i];
JSON_loc++; //23
} //JSON_loc left at location of next character
*/
//memset(&buffer[0], 0, sizeof(buffer)); //clear out buffer
for (int i=0; i < total_chars_temp; i++)
{
AdvData[JSON_loc] = temp_char[i];
JSON_loc++;
} //JSON_loc left at location of next character
//AdvData[JSON_loc] = 0x0; //since AdvData was cleared to start with, we don't need to null term
ApplicationData_t appData;
setupApplicationData(appData);
/*********************
* start encrypting last 16 bytes of ADV_Data
*********************/
for (int i=0; i<16; i++)
{
src_buf[i] = AdvData[i+10]; //start of encrypted section is at AdvData[10]
}
nrf_ecb_init();
nrf_ecb_set_key(key_buf);
bool successful_ecb = nrf_ecb_crypt(des_buf, src_buf);
#if MyDebugEnb
device.printf("success ecb = %d \r\n", successful_ecb);
device.printf("src_buf: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x \r\n", src_buf[0], src_buf[1], src_buf[2], src_buf[3], src_buf[4], src_buf[5], src_buf[6], src_buf[7], src_buf[8], src_buf[9], src_buf[10], src_buf[11], src_buf[12], src_buf[13], src_buf[14], src_buf[15]);
device.printf("des_buf: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x \r\n", des_buf[0], des_buf[1], des_buf[2], des_buf[3], des_buf[4], des_buf[5], des_buf[6], des_buf[7], des_buf[8], des_buf[9], des_buf[10], des_buf[11], des_buf[12], des_buf[13], des_buf[14], des_buf[15]);
#endif
for (int i=0; i<16; i++) //replace last 16 bytes with encrypted 16 bytes
{
AdvData[i+10] = des_buf[i];
}
//set payload for advertisement to our custom manufactured data. First 5 bytes is BLE standard, last 26 bytes is our array
//ble.gap().updateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, (uint8_t *) &appData, sizeof(ApplicationData_t));
ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, AdvData, sizeof(AdvData));
Flag_Update_IO = false;
Flag_Periodic_Call = false;
ble.gap().startAdvertising();
Tic_Stop_Adv.attach(stop_adv_Callback, 3); /* trigger turn off advertisement after X seconds */
}//end Flag_Update_IO
if (Flag_Detach_Adv_Tic == true) //ticker callback flag to stop advertising
{
ble.gap().stopAdvertising(); //may be safer to execute BLE operations in main
Tic_Stop_Adv.detach();
Flag_Detach_Adv_Tic = false;
}
ble.waitForEvent(); //sleeps until interrupt form ticker or I/O
}//end forever while
}//end main