Jonas Skalman
Reading SenseAir LP8 CO2 sensor over bluetooth low energy
Dependencies: BLE_API mbed nRF51822
Diff: main.cpp
- Revision:
- 2:d02255d8c36f
- Parent:
- 1:b512a405b584
- Child:
- 3:933dd59ad44d
diff -r b512a405b584 -r d02255d8c36f main.cpp
--- a/main.cpp Mon Jun 05 11:10:28 2017 +0000
+++ b/main.cpp Mon Aug 14 20:52:48 2017 +0000
@@ -3,31 +3,38 @@
#include "LP8_Service.h"
#include "LP8.h"
+//Sensor and ble Configuration parameters
+#define SENSOR_TIMER 20.0 //lp8 polling interval (seconds)
+#define BLE_ADV_INTERVAL 500 //advertisment interval (milliseconds)
+#define BACKGROUND_CALIBRATION_TIME 180 //timer to do background calibration (seconds)
+
+
+
//setup ble stack
BLE ble; //BLE object
-// Pins and timers needed for lp8 communication
-DigitalIn RDY(P0_5); //
-DigitalOut VBB_EN(P0_29, 0); //set to low at startup
+// setup Pins
+DigitalOut Res(P0_0, 1); //reset, pull Low for reset
+DigitalIn RDY(P0_10); //rdy
+DigitalOut VBB_EN(P0_5, 0); //set to low at startup
Serial Device(P0_9, P0_11); //tx, rx
+
+// Timers
Timer lp8Wait; //timer for sensor communication
-
+Timer bCalibration; //timer for background calibration
-//Sensor and ble Configuration parameters
-#define SENSOR_TIMER 20.0 //lp8 polling interval (seconds)
-#define BLE_ADV_INTERVAL 1000 //advertisment interval (milliseconds)
-
-
-
-//device name and uuid list setup
+//BLE device name and uuid list setup
const static char DEVICE_NAME[] = "SenseAir LP8";
static const uint16_t uuid16_list[] = {LP8_Service::LP8_SERVICE_UUID};
-//check for sensor triggering and uppdating Gatt Server
-bool triggerSensor = false; //check for sensor polling, used with interupt
-LP8_Service *lp8ServicePtr; //pointer to lp8 service object
+//check for sensor triggering and uppdating the GattServer
+bool triggerSensor = false; //sensor polling flag
+bool doCalibration = false; //background calibration flag
+
+LP8_Service *lp8ServicePtr; //pointer to lp8 BLE service object
+uint8_t ccByte = 0x20; //calculation control byte to LP8
@@ -40,46 +47,63 @@
//restart broadcast
ble.gap().startAdvertising();
}
-//timer function callback
+//sensor polling interupt
void triggerSensorPollingInterupt()
{
triggerSensor = true;
};
+//app interupt for calibration...
+void calibrationCallback(const GattWriteCallbackParams *eventData)
+{
+ ccByte = eventData-> data[0];
+ doCalibration = true;
+}
-//main
-int main(void)
+//**************************** main **************************************
+int main()
{
wait(1);
+
Ticker lp8Timer; //timer object for sensor polling interupts
- lp8Timer.attach(&triggerSensorPollingInterupt, SENSOR_TIMER); //trigger sensor reading every X.Y sec
+
+ //timer callback
+ lp8Timer.attach(&triggerSensorPollingInterupt, SENSOR_TIMER); //trigger sensor reading every X sec
+
+ ble.init();
+
+ //disconnect callback
+ ble.gap().onDisconnection( disconnectionCallback ); //do callback if ble disconnect
+ //on data recevied callback
+ ble.onDataWritten( calibrationCallback ); //trigger for calibration control
+
+//************************ LP8 variables *********************************
+ int co2Value = 400; //initial CO2 value
+ double tempValue = 20.0; //init temp value
+ int Vcap = 3000; //mV
+ uint32_t errorFlag = 0; //error bits from lp8
- ble.init();
- ble.gap().onDisconnection(disconnectionCallback); //do callback if disconnection occurs
+//************************ Checks *********************************
+ bool initCheck = true; //check for init sensor state
+ bool successCheck = false; //check for sensor communication
+
+//************************ Calculation control bytes ********************
+// uint8_t sM = 0x20; //lp8 calculation control byte using Subesquent Measurments mode
+// uint8_t bC = 0x52; //Background Calibration using unfilterd data + reset filters
+
+
+//setup LP8 object
+ LP8 lp8(Device, VBB_EN, RDY, Res, lp8Wait); //pass pins: serial, vbb, rdy, res, timer
+
+//Setup GattService
+ LP8_Service lp8Service(ble, co2Value, tempValue,
+ Vcap, errorFlag, ccByte); //
+ lp8ServicePtr = &lp8Service; //
- int co2Value = 400; //initial CO2 value to display
- bool initCheck = true; //check for init sensor state (or lost state)
- bool successCheck = false; //check for sensor communication
- //calibration control bytes for the lp 8
- uint8_t subsequentMeasurement = 0x20; //lp8 calculation control byte for subs. measurements
- uint8_t noResetABC = 0x70; //abc calibration byte with no reset on filters
- uint8_t resetABC = 0x72; //abc calibration AND resets filters
- uint8_t backgroundCalibration = 0x52; //background calibration using unfilterd data + resets filters
-
-//setup LP8 object
- LP8 lp8(Device, VBB_EN, RDY, lp8Wait); //constructor needs 4 arguments
-
-
-//setup for GattService
-/* Setup Gatt server */
- LP8_Service lp8Service(ble, co2Value); //pass in ble object and initial co2 value
- lp8ServicePtr = &lp8Service; //set pointer to "real" lp8 service object
-
-
-/* setup ble advertising parameters */
+// setup ble advertising parameters
ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); //general bluetooth information(only support for ble
ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list)); //service list
ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
@@ -87,31 +111,51 @@
ble.gap().setAdvertisingInterval(BLE_ADV_INTERVAL); /* advertising interval in ms. */
ble.gap().startAdvertising(); //start broadcast
- /* SpinWait for initialization to complete. */
- while (ble.hasInitialized() == false) { /* spin loop */ }
+// Wait for initialization to complete.
+ while (ble.hasInitialized() == false) {
+ /* spin loop */
+ }
-//start the main loop
+//*************************** start the main loop ***********************************
while ( true )
{
if(triggerSensor && ble.gap().getState().connected ) //trigger when timer interupts and there is an established ble connection
{
if ( initCheck ) {
+
successCheck = lp8.lp8Init(); //initialize talking with the lp8 (first call on startup)
if ( successCheck ) {
initCheck = false;
}
}
+/*
+ else if ( doCalibration && ccByte == bC ){
+ lp8.lp8Talk( bC ); //do background calibration
+ bCalibration.start();
+ if( bCalibration.read() >= BACKGROUND_CALIBRATION_TIME ){
+ bCalibration.stop();
+ bCalibration.reset();
+ doCalibration = false;
+ ccByte = 0xff;
+ }
+ }
+*/
else {
- lp8.lp8Talk( subsequentMeasurement ); //Communication with the lp8, sends calculation control: 0x20 == subs. talks
+ lp8.lp8Talk( ccByte ); //Communication with lp8, pass Calculation control byte
}
+
//reset polling check
triggerSensor = false;
- //update the gattServer with new CO2 value
- lp8ServicePtr->updateCo2Value( lp8.getValue() );
+ //update the gattServer
+ lp8ServicePtr->updateCo2Value( lp8.getValue() ); //get CO2 value
+ lp8ServicePtr->updateTempValue( lp8.getTempValue() ); //
+ lp8ServicePtr->updateVcapValue( lp8.getVcapValue() ); //
+ lp8ServicePtr->updateError( lp8.getErrorStatus() ); //
+ lp8ServicePtr->updateDataWritten( lp8.getCCbyte() ); //send back the calculation control byte that was used in LP8 measurement
}
else { ble.waitForEvent(); } //ble save energy