for speedsensor dasdevelop
MMA8451Q.cpp@7:6edc31ecae9e, 2015-03-19 (annotated)
- Committer:
- tasdevelop
- Date:
- Thu Mar 19 02:34:30 2015 +0000
- Revision:
- 7:6edc31ecae9e
- Parent:
- 5:93664a641e43
release tasdevelop
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
samux | 1:d2630136d51e | 1 | /* Copyright (c) 2010-2011 mbed.org, MIT License |
samux | 1:d2630136d51e | 2 | * |
samux | 1:d2630136d51e | 3 | * Permission is hereby granted, free of charge, to any person obtaining a copy of this software |
samux | 1:d2630136d51e | 4 | * and associated documentation files (the "Software"), to deal in the Software without |
samux | 1:d2630136d51e | 5 | * restriction, including without limitation the rights to use, copy, modify, merge, publish, |
samux | 1:d2630136d51e | 6 | * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the |
samux | 1:d2630136d51e | 7 | * Software is furnished to do so, subject to the following conditions: |
samux | 1:d2630136d51e | 8 | * |
samux | 1:d2630136d51e | 9 | * The above copyright notice and this permission notice shall be included in all copies or |
samux | 1:d2630136d51e | 10 | * substantial portions of the Software. |
samux | 1:d2630136d51e | 11 | * |
samux | 1:d2630136d51e | 12 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
samux | 1:d2630136d51e | 13 | * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
samux | 1:d2630136d51e | 14 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
samux | 1:d2630136d51e | 15 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
samux | 1:d2630136d51e | 16 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
samux | 1:d2630136d51e | 17 | */ |
samux | 1:d2630136d51e | 18 | |
emilmont | 0:6149091f755d | 19 | #include "MMA8451Q.h" |
emilmont | 0:6149091f755d | 20 | |
samux | 1:d2630136d51e | 21 | #define REG_WHO_AM_I 0x0D |
samux | 1:d2630136d51e | 22 | #define REG_CTRL_REG_1 0x2A |
emilmont | 0:6149091f755d | 23 | #define REG_OUT_X_MSB 0x01 |
emilmont | 0:6149091f755d | 24 | #define REG_OUT_Y_MSB 0x03 |
emilmont | 0:6149091f755d | 25 | #define REG_OUT_Z_MSB 0x05 |
emilmont | 0:6149091f755d | 26 | |
samux | 1:d2630136d51e | 27 | #define UINT14_MAX 16383 |
emilmont | 0:6149091f755d | 28 | |
emilmont | 0:6149091f755d | 29 | MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { |
emilmont | 0:6149091f755d | 30 | // activate the peripheral |
suzukimitsuhiro | 5:93664a641e43 | 31 | #if 0 |
emilmont | 0:6149091f755d | 32 | uint8_t data[2] = {REG_CTRL_REG_1, 0x01}; |
suzukimitsuhiro | 5:93664a641e43 | 33 | // uint8_t data[2] = {REG_CTRL_REG_1, 0x1B}; //100Hz FastRead |
samux | 1:d2630136d51e | 34 | writeRegs(data, 2); |
suzukimitsuhiro | 5:93664a641e43 | 35 | #else |
suzukimitsuhiro | 5:93664a641e43 | 36 | #define XYZ_DATA_CFG_REG 0x0E |
suzukimitsuhiro | 5:93664a641e43 | 37 | uint8_t data2[2] = {XYZ_DATA_CFG_REG, 0x02}; //8G |
tasdevelop | 7:6edc31ecae9e | 38 | uint8_t data[2] = {REG_CTRL_REG_1, 0x1B}; //100Hz FastRead |
suzukimitsuhiro | 5:93664a641e43 | 39 | writeRegs(data2, 2); |
suzukimitsuhiro | 5:93664a641e43 | 40 | writeRegs(data, 2); |
suzukimitsuhiro | 5:93664a641e43 | 41 | #endif |
emilmont | 0:6149091f755d | 42 | } |
emilmont | 0:6149091f755d | 43 | |
emilmont | 0:6149091f755d | 44 | MMA8451Q::~MMA8451Q() { } |
emilmont | 0:6149091f755d | 45 | |
emilmont | 0:6149091f755d | 46 | uint8_t MMA8451Q::getWhoAmI() { |
emilmont | 0:6149091f755d | 47 | uint8_t who_am_i = 0; |
samux | 1:d2630136d51e | 48 | readRegs(REG_WHO_AM_I, &who_am_i, 1); |
emilmont | 0:6149091f755d | 49 | return who_am_i; |
emilmont | 0:6149091f755d | 50 | } |
emilmont | 0:6149091f755d | 51 | |
chris | 3:db7126dbd63f | 52 | float MMA8451Q::getAccX() { |
tasdevelop | 7:6edc31ecae9e | 53 | #if 0 |
tasdevelop | 7:6edc31ecae9e | 54 | return (float(getAccAxis(REG_OUT_X_MSB))/4096.0); |
tasdevelop | 7:6edc31ecae9e | 55 | #else |
suzukimitsuhiro | 5:93664a641e43 | 56 | return (float(getAccAxis(REG_OUT_X_MSB))/1024.0); |
tasdevelop | 7:6edc31ecae9e | 57 | #endif |
emilmont | 0:6149091f755d | 58 | } |
emilmont | 0:6149091f755d | 59 | |
chris | 3:db7126dbd63f | 60 | float MMA8451Q::getAccY() { |
tasdevelop | 7:6edc31ecae9e | 61 | #if 0 |
tasdevelop | 7:6edc31ecae9e | 62 | return (float(getAccAxis(REG_OUT_Y_MSB))/4096.0); |
tasdevelop | 7:6edc31ecae9e | 63 | #else |
suzukimitsuhiro | 5:93664a641e43 | 64 | return (float(getAccAxis(REG_OUT_Y_MSB))/1024.0); |
tasdevelop | 7:6edc31ecae9e | 65 | #endif |
emilmont | 0:6149091f755d | 66 | } |
emilmont | 0:6149091f755d | 67 | |
chris | 3:db7126dbd63f | 68 | float MMA8451Q::getAccZ() { |
tasdevelop | 7:6edc31ecae9e | 69 | #if 0 |
tasdevelop | 7:6edc31ecae9e | 70 | return (float(getAccAxis(REG_OUT_Z_MSB))/4096.0); |
tasdevelop | 7:6edc31ecae9e | 71 | #else |
tasdevelop | 7:6edc31ecae9e | 72 | return (float(getAccAxis(REG_OUT_Z_MSB))/1024.0); |
tasdevelop | 7:6edc31ecae9e | 73 | #endif |
emilmont | 0:6149091f755d | 74 | } |
emilmont | 0:6149091f755d | 75 | |
chris | 3:db7126dbd63f | 76 | void MMA8451Q::getAccAllAxis(float * res) { |
emilmont | 0:6149091f755d | 77 | res[0] = getAccX(); |
emilmont | 0:6149091f755d | 78 | res[1] = getAccY(); |
emilmont | 0:6149091f755d | 79 | res[2] = getAccZ(); |
emilmont | 0:6149091f755d | 80 | } |
emilmont | 0:6149091f755d | 81 | |
emilmont | 0:6149091f755d | 82 | int16_t MMA8451Q::getAccAxis(uint8_t addr) { |
emilmont | 0:6149091f755d | 83 | int16_t acc; |
emilmont | 0:6149091f755d | 84 | uint8_t res[2]; |
samux | 1:d2630136d51e | 85 | readRegs(addr, res, 2); |
emilmont | 0:6149091f755d | 86 | |
emilmont | 0:6149091f755d | 87 | acc = (res[0] << 6) | (res[1] >> 2); |
emilmont | 0:6149091f755d | 88 | if (acc > UINT14_MAX/2) |
emilmont | 0:6149091f755d | 89 | acc -= UINT14_MAX; |
emilmont | 0:6149091f755d | 90 | |
emilmont | 0:6149091f755d | 91 | return acc; |
emilmont | 0:6149091f755d | 92 | } |
emilmont | 0:6149091f755d | 93 | |
samux | 1:d2630136d51e | 94 | void MMA8451Q::readRegs(int addr, uint8_t * data, int len) { |
emilmont | 0:6149091f755d | 95 | char t[1] = {addr}; |
emilmont | 0:6149091f755d | 96 | m_i2c.write(m_addr, t, 1, true); |
emilmont | 0:6149091f755d | 97 | m_i2c.read(m_addr, (char *)data, len); |
emilmont | 0:6149091f755d | 98 | } |
emilmont | 0:6149091f755d | 99 | |
samux | 1:d2630136d51e | 100 | void MMA8451Q::writeRegs(uint8_t * data, int len) { |
emilmont | 0:6149091f755d | 101 | m_i2c.write(m_addr, (char *)data, len); |
emilmont | 0:6149091f755d | 102 | } |