Diff: GroveEarbudSensor.cpp

Revision:

0:35588fbd6d5c

Child:

4:618117fe4b04

diff -r 000000000000 -r 35588fbd6d5c GroveEarbudSensor.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/GroveEarbudSensor.cpp	Thu Sep 25 21:34:48 2014 +0000
@@ -0,0 +1,129 @@
+/* Copyright C2014 ARM, MIT License
+ *
+ * Author: Doug Anson (doug.anson@arm.com)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files the "Software", to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+ 
+ #include "GroveEarbudSensor.h"
+ 
+ // Console logging
+ #define LOG_CONSOLE(...) { if (this->m_pc != NULL) this->m_pc->printf(__VA_ARGS__); }
+
+ // Our instance
+ GroveEarbudSensor *_grove_earbud_sensor_instance = NULL;
+ 
+ // interrupt function
+ void __grove_earbud_sensor_interrupt() { if (_grove_earbud_sensor_instance != NULL) _grove_earbud_sensor_instance->interrupt(); }
+ 
+ // constructor
+ GroveEarbudSensor::GroveEarbudSensor(InterruptIn *rx,Serial *pc) {
+     _grove_earbud_sensor_instance  = this;
+     this->m_rx                     = rx;
+     this->m_pc                     = pc;
+     this->m_sub                    = 0;
+     this->m_counter                = 0;
+     this->m_data_effect            = true;
+     this->m_cb_fn                  = NULL;
+     this->m_cb_data                = NULL;
+     this->m_heartrate              = HEARTRATE_OFF;
+     this->m_timer                  = new Timer();
+     
+     // register the interrupt handler
+     if (this->m_rx != NULL) this->m_rx->rise(&__grove_earbud_sensor_interrupt);
+          
+     // start the timer and initialize the summation array
+     if (this->m_timer != NULL) {
+         // start the timer
+         this->m_timer->start();
+     
+         // initialize the summation array
+         this->initSummationArray();
+     }
+ }
+ 
+ // destructor
+ GroveEarbudSensor::~GroveEarbudSensor() {
+     if (this->m_timer != NULL) delete this->m_timer;
+ }
+ 
+ // initialize the summation array
+ void GroveEarbudSensor::initSummationArray(void) {
+    for(int i=0;i<(NUM_SLOTS-1);++i) this->m_temp[i]=0;
+    this->m_temp[NUM_SLOTS-1] = this->m_timer->read_ms();
+ }
+ 
+ // register callback 
+ void GroveEarbudSensor::registerCallback(GroveEarbudSensorCallback *cb_fn,void *cb_data) {
+     this->m_cb_fn = cb_fn;
+     this->m_cb_data = cb_data;
+ }
+ 
+ // get the current heartrate
+ float GroveEarbudSensor::getHeartRate(void) { return this->m_heartrate; }
+
+ // summation method + internal callback to fire any registered callback fns
+ void GroveEarbudSensor::sumAndInvokeCallback(void) {
+   if(this->m_data_effect) {
+      // summation
+      int tmp = 60 * (NUM_SLOTS-1) * 1000;
+      this->m_heartrate = tmp/(this->m_temp[NUM_SLOTS-1]-this->m_temp[0]);
+      
+      // DEBUG/Log
+      LOG_CONSOLE("heartrate: %d bpm\r\n",this->m_heartrate);
+      
+      // invoke any callbacks we might have
+      if (this->m_cb_fn != NULL) {
+          // invoke the callback
+          LOG_CONSOLE("invoking callback with heartrate = %d bpm\r\n",this->m_heartrate);
+          (*this->m_cb_fn)(this->m_heartrate,this->m_cb_data);
+      }
+   }
+   this->m_data_effect = 1;  //sign bit
+}
+
+ // interrupt() method for earbud
+ void GroveEarbudSensor::interrupt() {
+    this->m_temp[this->m_counter] = this->m_timer->read_ms();
+    switch(this->m_counter) {
+        case 0:
+            this->m_sub=this->m_temp[this->m_counter]-this->m_temp[NUM_SLOTS-1];
+            break;
+        default:
+            this->m_sub=this->m_temp[this->m_counter]-this->m_temp[this->m_counter-1];
+            break;
+    }
+    if(this->m_sub > HEARTPULSE_DUTY) { 
+        this->m_data_effect = 0; //sign bit
+        this->m_counter = 0;
+        LOG_CONSOLE("heartrate measure error. Restarting timer..\r\n");
+        this->initSummationArray();
+        this->m_timer->stop();
+        this->m_timer->start();
+    }
+    if (this->m_counter == (NUM_SLOTS-1) && this->m_data_effect) {
+        this->m_counter = 0;
+        this->sumAndInvokeCallback();
+    }
+    else if(this->m_counter != (NUM_SLOTS-1) && this->m_data_effect) {
+        this->m_counter++;
+    }
+    else {
+        this->m_counter = 0;
+        this->m_data_effect = 1;
+    }
+ }
+ 
\ No newline at end of file