Frank Duignan / Mbed 2 deprecated BLE_BBC_LSM303_MAG

Test program for magnetometer

Dependencies:   mbed AES BLE_API nRF51822 smallAES

magservice.h@3:b9783107a8c4, 2019-09-30 (annotated)

Committer:
f3d
Date:
Mon Sep 30 11:59:42 2019 +0000
Revision:
3:b9783107a8c4
Magnetometer for the LSM303

Who changed what in which revision?

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f3d 3:b9783107a8c4 1 /* mbed Microcontroller Library
f3d 3:b9783107a8c4 2 * Copyright (c) 2006-2013 ARM Limited
f3d 3:b9783107a8c4 3 *
f3d 3:b9783107a8c4 4 * Licensed under the Apache License, Version 2.0 (the "License");
f3d 3:b9783107a8c4 5 * you may not use this file except in compliance with the License.
f3d 3:b9783107a8c4 6 * You may obtain a copy of the License at
f3d 3:b9783107a8c4 7 *
f3d 3:b9783107a8c4 8 * http://www.apache.org/licenses/LICENSE-2.0
f3d 3:b9783107a8c4 9 *
f3d 3:b9783107a8c4 10 * Unless required by applicable law or agreed to in writing, software
f3d 3:b9783107a8c4 11 * distributed under the License is distributed on an "AS IS" BASIS,
f3d 3:b9783107a8c4 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
f3d 3:b9783107a8c4 13 * See the License for the specific language governing permissions and
f3d 3:b9783107a8c4 14 * limitations under the License.
f3d 3:b9783107a8c4 15 */
f3d 3:b9783107a8c4 16
f3d 3:b9783107a8c4 17 #ifndef __BLE_MAG_SERVICE_H__
f3d 3:b9783107a8c4 18 #define __BLE_MAG_SERVICE_H__
f3d 3:b9783107a8c4 19 #include <mbed.h>
f3d 3:b9783107a8c4 20 // Accelerometer : LSM303
f3d 3:b9783107a8c4 21 //I2C i2c(P0_30, P0_0); // SDA is on P0_30, SCL is on P0_0
f3d 3:b9783107a8c4 22 const int LSM303_ADDRESS = (0x19<<1);
f3d 3:b9783107a8c4 23 //const int MMA8653_ID = 0x5a;
f3d 3:b9783107a8c4 24 class MAGService {
f3d 3:b9783107a8c4 25 public:
f3d 3:b9783107a8c4 26 const static uint16_t MAG_SERVICE_UUID = 0xfff3;
f3d 3:b9783107a8c4 27 const static uint16_t MAG_X_CHARACTERISTIC_UUID = 0x1;
f3d 3:b9783107a8c4 28 const static uint16_t MAG_Y_CHARACTERISTIC_UUID = 0x2;
f3d 3:b9783107a8c4 29 const static uint16_t MAG_Z_CHARACTERISTIC_UUID = 0x3;
f3d 3:b9783107a8c4 30
f3d 3:b9783107a8c4 31 MAGService(BLEDevice &_ble, int16_t initialValueForMAGCharacteristic) :
f3d 3:b9783107a8c4 32 ble(_ble), MagX(MAG_X_CHARACTERISTIC_UUID, &initialValueForMAGCharacteristic),MagY(MAG_Y_CHARACTERISTIC_UUID, &initialValueForMAGCharacteristic),MagZ(MAG_Z_CHARACTERISTIC_UUID, &initialValueForMAGCharacteristic)
f3d 3:b9783107a8c4 33 {
f3d 3:b9783107a8c4 34 GattCharacteristic *charTable[] = {&MagX,&MagY,&MagZ};
f3d 3:b9783107a8c4 35 GattService MagService(MAG_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
f3d 3:b9783107a8c4 36 ble.addService(MagService);
f3d 3:b9783107a8c4 37 // Wake the accelerometer from sleep mode by writing disabling low power mode, setting freq to 10Hz and enabling all three axes
f3d 3:b9783107a8c4 38 char Data[8]; // Declare a buffer for data transfer
f3d 3:b9783107a8c4 39 int Status;
f3d 3:b9783107a8c4 40 Data[0]=0x20; // wake up LSM303 (max speed, all accel channels)
f3d 3:b9783107a8c4 41 Data[1]=0x77;
f3d 3:b9783107a8c4 42 Status = i2c.write(LSM303_ADDRESS,Data,2); // Write data to register
f3d 3:b9783107a8c4 43
f3d 3:b9783107a8c4 44 Data[0]=0x23; // enable high resolution mode
f3d 3:b9783107a8c4 45 Data[1]=0x0e;
f3d 3:b9783107a8c4 46 Status = i2c.write(LSM303_ADDRESS,Data,2); // Write data to register
f3d 3:b9783107a8c4 47 }
f3d 3:b9783107a8c4 48
f3d 3:b9783107a8c4 49 GattAttribute::Handle_t getValueHandle() const {
f3d 3:b9783107a8c4 50 return MagX.getValueHandle();
f3d 3:b9783107a8c4 51 }
f3d 3:b9783107a8c4 52 void updateMagX(uint16_t newValue) {
f3d 3:b9783107a8c4 53 ble.gattServer().write(MagX.getValueHandle(), (uint8_t *)&newValue, sizeof(uint16_t));
f3d 3:b9783107a8c4 54 }
f3d 3:b9783107a8c4 55 void updateMagY(uint16_t newValue) {
f3d 3:b9783107a8c4 56 ble.gattServer().write(MagY.getValueHandle(), (uint8_t *)&newValue, sizeof(uint16_t));
f3d 3:b9783107a8c4 57 }
f3d 3:b9783107a8c4 58 void updateMagZ(uint16_t newValue) {
f3d 3:b9783107a8c4 59 ble.gattServer().write(MagZ.getValueHandle(), (uint8_t *)&newValue, sizeof(uint16_t));
f3d 3:b9783107a8c4 60 }
f3d 3:b9783107a8c4 61 void poll()
f3d 3:b9783107a8c4 62 {
f3d 3:b9783107a8c4 63 char Data[8]; // Declare a buffer for data transfer
f3d 3:b9783107a8c4 64 int Status;
f3d 3:b9783107a8c4 65 int16_t X;
f3d 3:b9783107a8c4 66
f3d 3:b9783107a8c4 67 // Modify to suit your chip:
f3d 3:b9783107a8c4 68 // Goal get X,Y and Z readings off magnetometer.
f3d 3:b9783107a8c4 69 Data[0]=0x80 + 0x28; // Register number 0x28 has the X data (2 bytes)
f3d 3:b9783107a8c4 70 Status = i2c.write(LSM303_ADDRESS,Data,1,true); // Write register number
f3d 3:b9783107a8c4 71 Status = i2c.read(LSM303_ADDRESS,Data,2); // Read register contents
f3d 3:b9783107a8c4 72 X = Data[1];
f3d 3:b9783107a8c4 73 X = (X << 8) + Data[0];
f3d 3:b9783107a8c4 74
f3d 3:b9783107a8c4 75 int16_t Y;
f3d 3:b9783107a8c4 76 Data[0]=0x80 + 0x2a; // Register number 0x2a has the Y data (2 bytes)
f3d 3:b9783107a8c4 77 Status = i2c.write(LSM303_ADDRESS,Data,1,true); // Write register number
f3d 3:b9783107a8c4 78 Status = i2c.read(LSM303_ADDRESS,Data,2); // Read register contents
f3d 3:b9783107a8c4 79 Y = Data[1];
f3d 3:b9783107a8c4 80 Y = (Y << 8) + Data[0];
f3d 3:b9783107a8c4 81
f3d 3:b9783107a8c4 82 int16_t Z;
f3d 3:b9783107a8c4 83 Data[0]=0x80 + 0x2c; // Register number 0x2c has the Z data (2 bytes)
f3d 3:b9783107a8c4 84 Status = i2c.write(LSM303_ADDRESS,Data,1,true); // Write register number
f3d 3:b9783107a8c4 85 Status = i2c.read(LSM303_ADDRESS,Data,2); // Read register contents
f3d 3:b9783107a8c4 86 Z = Data[1];
f3d 3:b9783107a8c4 87 Z = (Z << 8) + Data[0];
f3d 3:b9783107a8c4 88
f3d 3:b9783107a8c4 89 updateMagX(X);
f3d 3:b9783107a8c4 90 updateMagY(Y);
f3d 3:b9783107a8c4 91 updateMagZ(Z);
f3d 3:b9783107a8c4 92
f3d 3:b9783107a8c4 93 }
f3d 3:b9783107a8c4 94 private:
f3d 3:b9783107a8c4 95 BLEDevice &ble;
f3d 3:b9783107a8c4 96 ReadOnlyGattCharacteristic<int16_t> MagX;
f3d 3:b9783107a8c4 97 ReadOnlyGattCharacteristic<int16_t> MagY;
f3d 3:b9783107a8c4 98 ReadOnlyGattCharacteristic<int16_t> MagZ;
f3d 3:b9783107a8c4 99 };
f3d 3:b9783107a8c4 100
f3d 3:b9783107a8c4 101 #endif /* #ifndef __BLE_ACCEL_SERVICE_H__ */