Diff: main.cpp

Revision:

51:0bf1116bca52

Parent:

50:4c02add9abba

Child:

52:8e483d1199f9

--- a/main.cpp	Wed Oct 22 17:08:57 2014 +0000
+++ b/main.cpp	Sun Nov 02 20:44:53 2014 +0000
@@ -1,86 +1,66 @@
+// This code is for the nRF51822 that is used to provide a BLE interface to PILLar
+// There is 1 service and 1 characteristic
+// The service provides a way to write a step value from the phone to a stepper motor
+// controlled by an Arduino
 #include "mbed.h"
 #include "BLEDevice.h"
 
-BLEDevice  ble;
-DigitalOut led1(LED1);
+BLEDevice  ble;                 // Declare the ble device
+Serial arduino(USBTX, USBRX);   // serial interface to PC or Arduino controlling the stepper
 
-const uint8_t LED1_UUID[LENGTH_OF_LONG_UUID] = {
+// Arbit 128-bit UIDs generated from 
+// http://www.guidgenerator.com/online-guid-generator.aspx
+// We need one for each service and characteristic
+const uint8_t ARDUINO_WRITE_CHARACTERISTIC_UUID[LENGTH_OF_LONG_UUID] = {
     0xfb, 0x71, 0xbc, 0xc0, 0x5a, 0x0c, 0x11, 0xe4,
     0x91, 0xae, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b
 };
-const uint8_t BUTTON_UUID[LENGTH_OF_LONG_UUID] = {
-    0x7a, 0x77, 0xbe, 0x20, 0x5a, 0x0d, 0x11, 0xe4,
-    0xa9, 0x5e, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b
-};
+
 const uint8_t TEST_SERVICE_UUID[LENGTH_OF_LONG_UUID] = {
     0xb0, 0xbb, 0x58, 0x20, 0x5a, 0x0d, 0x11, 0xe4,
-    0x93, 0xee, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b
-};
+    0x93, 0xee, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b};
 
-const static char DEVICE_NAME[] = "Nordic";
-static volatile bool is_button_pressed = false;
-static volatile uint16_t led1_handler;
+const static char DEVICE_NAME[] = "mediCAL BLE";        // For Advertisement    
+static volatile uint16_t writeToArduino_handler;        // handler to echo data
 
-uint8_t led_state, button_state;
-
-void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
-{
+// What happens on disconnect event
+void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason){
     ble.startAdvertising(); // restart advertising
 }
 
-void changeLED(const GattCharacteristicWriteCBParams *eventDataP) {
+// This function is called whenever data is written to the BLE device through the phone
+void onDatawritten(const GattCharacteristicWriteCBParams *eventDataP) {
+    arduino.printf("Enter onDataWritten\n\r");
     // eventDataP->charHandle is just uint16_t
     // it's used to dispatch the callbacks
-    if (eventDataP->charHandle == led1_handler) {
-        led1 = eventDataP->data[0] % 2;
+    if(eventDataP->charHandle==writeToArduino_handler){         // The data is for the motor
+        arduino.printf("Got some Arduino-specific info!\n\r");
+        uint16_t bytesRead = eventDataP->len;
+        int turnSteps = *((int16_t *)eventDataP->data);
+        arduino.printf("%i\n\r", turnSteps); 
     }
 }
 
-void button1Pressed() {
-    button_state = 1;
-    is_button_pressed = true;
-}
-void button2Pressed() {
-    button_state = 2;
-    is_button_pressed = true;
-}
-
 int main(void)
 {
-    // button initialization
-    InterruptIn button1(BUTTON1);
-    InterruptIn button2(BUTTON2);
-    button1.mode(PullUp);
-    button2.mode(PullUp);
-    button1.rise(&button1Pressed);
-    button2.rise(&button2Pressed);
-    led1 = 0;
+    arduino.printf("Entered main\n\r");
 
-    // just a simple service example
-    // o led1 characteristics, you can write from the phone to control led1
-    // o button characteristics, you can read and get notified
-    GattCharacteristic led1_characteristics(
-        LED1_UUID, &led_state, sizeof(led_state), sizeof(led_state),
-        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ |
-        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);
-    led1_handler = led1_characteristics.getValueAttribute().getHandle();
+    // You can write from the phone to control what is written to Arduino
+    GattCharacteristic writeToArduino_characteristics(
+        ARDUINO_WRITE_CHARACTERISTIC_UUID, NULL, sizeof(int16_t), sizeof(int16_t),
+        GattCharacteristic::BLE_GATT_FORMAT_SINT16 |                                        //16bit signed INT
+        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ |                                 // has read
+        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);                                // and write properties
+    writeToArduino_handler = writeToArduino_characteristics.getValueAttribute().getHandle();// save the handler
 
-    GattCharacteristic button_characteristics(
-        BUTTON_UUID, &button_state, sizeof(button_state), sizeof(button_state),
-        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | 
-        GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
-    
-    const uint8_t TEST_SERVICE_UUID[LENGTH_OF_LONG_UUID] = {
-        0xb0, 0xbb, 0x58, 0x20, 0x5a, 0x0d, 0x11, 0xe4,
-        0x93, 0xee, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b};
-    GattCharacteristic *charTable[] = {&led1_characteristics, &button_characteristics};
-    GattService testService(TEST_SERVICE_UUID, charTable,
+    GattCharacteristic *charTable[] = {&writeToArduino_characteristics};                    // Characteristic table
+    GattService testService(TEST_SERVICE_UUID, charTable,                                   // Add the char(s) to this service
                             sizeof(charTable) / sizeof(GattCharacteristic *));
 
     // BLE setup, mainly we add service and callbacks
     ble.init();
     ble.addService(testService);
-    ble.onDataWritten(&changeLED);
+    ble.onDataWritten(&onDatawritten);
     ble.onDisconnection(disconnectionCallback);
     
     // setup advertising
@@ -93,13 +73,7 @@
     ble.startAdvertising();
 
     while (true) {
-        if (is_button_pressed) {
-            // if button pressed, we update the characteristics
-            is_button_pressed = false;
-            ble.updateCharacteristicValue(button_characteristics.getValueAttribute().getHandle(),
-                                          &button_state, sizeof(button_state));
-        } else {
+            arduino.printf("Waiting for ble Event\n\r");
             ble.waitForEvent();
-        }
     }
 }
\ No newline at end of file