Diff: accelService.h

Revision:

2:4871b5ad7938

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accelService.h	Mon Sep 30 10:38:33 2019 +0000
@@ -0,0 +1,100 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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.
+ */
+
+#ifndef __BLE_ACCEL_SERVICE_H__
+#define __BLE_ACCEL_SERVICE_H__
+#include <mbed.h>
+// Accelerometer : LSM303
+I2C i2c(P0_30, P0_0); // SDA is on P0_30, SCL is on P0_0
+const int LSM303_ADDRESS = (0x19<<1); 
+//const int MMA8653_ID = 0x5a;
+class ACCELService {
+public:
+    const static uint16_t ACCEL_SERVICE_UUID = 0xA012;
+    const static uint16_t ACCEL_X_CHARACTERISTIC_UUID = 0xA013;
+    const static uint16_t ACCEL_Y_CHARACTERISTIC_UUID = 0xA014;
+    const static uint16_t ACCEL_Z_CHARACTERISTIC_UUID = 0xA015;
+
+    ACCELService(BLEDevice &_ble, int16_t initialValueForACCELCharacteristic) :
+        ble(_ble), AccelX(ACCEL_X_CHARACTERISTIC_UUID, &initialValueForACCELCharacteristic),AccelY(ACCEL_Y_CHARACTERISTIC_UUID, &initialValueForACCELCharacteristic),AccelZ(ACCEL_Z_CHARACTERISTIC_UUID, &initialValueForACCELCharacteristic)
+    {
+        GattCharacteristic *charTable[] = {&AccelX,&AccelY,&AccelZ};
+        GattService         AccelService(ACCEL_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+        ble.addService(AccelService);
+        // Wake the accelerometer from sleep mode by writing disabling low power mode, setting freq to 10Hz and enabling all three axes
+        char Data[8]; // Declare a buffer for data transfer    
+        int Status;
+        Data[0]=0x20;   // wake up LSM303 (max speed, all accel channels)
+        Data[1]=0x77;
+        Status = i2c.write(LSM303_ADDRESS,Data,2);  // Write data to register   
+       
+        Data[0]=0x23;   // enable high resolution mode
+        Data[1]=0x0e; 
+        Status = i2c.write(LSM303_ADDRESS,Data,2);  // Write data to register   
+    }
+
+    GattAttribute::Handle_t getValueHandle() const {
+        return AccelX.getValueHandle();
+    }
+    void updateAccelX(uint16_t newValue) {
+        ble.gattServer().write(AccelX.getValueHandle(), (uint8_t *)&newValue, sizeof(uint16_t));
+    }
+    void updateAccelY(uint16_t newValue) {
+        ble.gattServer().write(AccelY.getValueHandle(), (uint8_t *)&newValue, sizeof(uint16_t));
+    }
+    void updateAccelZ(uint16_t newValue) {
+        ble.gattServer().write(AccelZ.getValueHandle(), (uint8_t *)&newValue, sizeof(uint16_t));
+    }
+    void poll()
+    {
+        char Data[8]; // Declare a buffer for data transfer    
+        int Status;
+        int16_t X;
+                         
+        
+        Data[0]=0x80 + 0x28; // Register number 0x28 has the X data (2 bytes)
+        Status = i2c.write(LSM303_ADDRESS,Data,1,true);  // Write register number
+        Status = i2c.read(LSM303_ADDRESS,Data,2); // Read register contents
+        X = Data[1];
+        X = (X << 8) + Data[0];
+        
+        int16_t Y;
+        Data[0]=0x80 + 0x2a; // Register number 0x2a has the Y data (2 bytes)
+        Status = i2c.write(LSM303_ADDRESS,Data,1,true);  // Write register number
+        Status = i2c.read(LSM303_ADDRESS,Data,2); // Read register contents
+        Y = Data[1];
+        Y = (Y << 8) + Data[0];
+        
+        int16_t Z;
+        Data[0]=0x80 + 0x2c; // Register number 0x2c has the Z data (2 bytes)
+        Status = i2c.write(LSM303_ADDRESS,Data,1,true);  // Write register number
+        Status = i2c.read(LSM303_ADDRESS,Data,2); // Read register contents
+        Z = Data[1];
+        Z = (Z << 8) + Data[0];
+        
+        updateAccelX(X);
+        updateAccelY(Y);
+        updateAccelZ(Z);        
+        
+    }
+private:
+    BLEDevice &ble;
+    ReadOnlyGattCharacteristic<int16_t>  AccelX;
+    ReadOnlyGattCharacteristic<int16_t>  AccelY;
+    ReadOnlyGattCharacteristic<int16_t>  AccelZ;
+};
+
+#endif /* #ifndef __BLE_ACCEL_SERVICE_H__ */