Llibrary for the WiGo MPL3115A2, I2C Precision Altimeter sensor.
Dependents: KL25Z_Batt_Test WIGO_MPL3115A2 Multi-Sensor SPACEmk2 ... more
30/05/2013 Added and tested the data acquisition using Interrupt. Added code for Altimeter trigger Interrupt but not yet tested.
Very basic library. Under development. Need to add in order: 1. IRQ configuration. 2. FIFO mode configuration.
MPL3115A2.cpp@1:30a04f651efe, 2013-05-23 (annotated)
- Committer:
- clemente
- Date:
- Thu May 23 12:42:45 2013 +0000
- Revision:
- 1:30a04f651efe
- Parent:
- 0:cfecfabc5e23
- Child:
- 2:a2fcfb7ff611
Corrected the example code inside the MPL3115A2.h file.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
clemente | 0:cfecfabc5e23 | 1 | #include "MPL3115A2.h" |
clemente | 0:cfecfabc5e23 | 2 | |
clemente | 0:cfecfabc5e23 | 3 | #define REG_WHO_AM_I 0x0C // 0xC4 by default |
clemente | 0:cfecfabc5e23 | 4 | #define REG_STATUS 0x00 |
clemente | 0:cfecfabc5e23 | 5 | #define REG_CTRL_REG_1 0x26 |
clemente | 0:cfecfabc5e23 | 6 | #define REG_PRESSURE_MSB 0x01 // 3 byte pressure data |
clemente | 0:cfecfabc5e23 | 7 | #define REG_ALTIMETER_MSB 0x01 // 3 byte altimeter data |
clemente | 0:cfecfabc5e23 | 8 | #define REG_TEMP_MSB 0x04 // 2 byte temperature data |
clemente | 0:cfecfabc5e23 | 9 | #define REG_PT_DATA_CFG 0x13 |
clemente | 0:cfecfabc5e23 | 10 | |
clemente | 0:cfecfabc5e23 | 11 | #define UINT14_MAX 16383 |
clemente | 0:cfecfabc5e23 | 12 | |
clemente | 0:cfecfabc5e23 | 13 | MPL3115A2::MPL3115A2(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { |
clemente | 0:cfecfabc5e23 | 14 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 15 | MPL3115A2_oversampling = OVERSAMPLE_RATIO_1; |
clemente | 0:cfecfabc5e23 | 16 | } |
clemente | 0:cfecfabc5e23 | 17 | |
clemente | 0:cfecfabc5e23 | 18 | void MPL3115A2::Barometric_Mode( void) |
clemente | 0:cfecfabc5e23 | 19 | { |
clemente | 0:cfecfabc5e23 | 20 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 21 | |
clemente | 0:cfecfabc5e23 | 22 | Standby(); |
clemente | 0:cfecfabc5e23 | 23 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 24 | |
clemente | 0:cfecfabc5e23 | 25 | // soft reset... |
clemente | 0:cfecfabc5e23 | 26 | unsigned char data[2] = { REG_CTRL_REG_1, t|0x04}; |
clemente | 0:cfecfabc5e23 | 27 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 28 | wait( 0.2); |
clemente | 0:cfecfabc5e23 | 29 | |
clemente | 0:cfecfabc5e23 | 30 | Standby(); |
clemente | 0:cfecfabc5e23 | 31 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 32 | |
clemente | 0:cfecfabc5e23 | 33 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 34 | data[1] = t&0x7F; |
clemente | 0:cfecfabc5e23 | 35 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 36 | |
clemente | 0:cfecfabc5e23 | 37 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 38 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 39 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 40 | |
clemente | 0:cfecfabc5e23 | 41 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 42 | |
clemente | 0:cfecfabc5e23 | 43 | Active(); |
clemente | 0:cfecfabc5e23 | 44 | |
clemente | 0:cfecfabc5e23 | 45 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 46 | } |
clemente | 0:cfecfabc5e23 | 47 | |
clemente | 0:cfecfabc5e23 | 48 | void MPL3115A2::Altimeter_Mode( void) |
clemente | 0:cfecfabc5e23 | 49 | { |
clemente | 0:cfecfabc5e23 | 50 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 51 | |
clemente | 0:cfecfabc5e23 | 52 | Standby(); |
clemente | 0:cfecfabc5e23 | 53 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 54 | |
clemente | 0:cfecfabc5e23 | 55 | // soft reset... |
clemente | 0:cfecfabc5e23 | 56 | unsigned char data[2] = { REG_CTRL_REG_1, t|0x04}; |
clemente | 0:cfecfabc5e23 | 57 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 58 | wait( 0.2); |
clemente | 0:cfecfabc5e23 | 59 | |
clemente | 0:cfecfabc5e23 | 60 | Standby(); |
clemente | 0:cfecfabc5e23 | 61 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 62 | |
clemente | 0:cfecfabc5e23 | 63 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 64 | data[1] = t|0x80; |
clemente | 0:cfecfabc5e23 | 65 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 66 | |
clemente | 0:cfecfabc5e23 | 67 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 68 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 69 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 70 | |
clemente | 0:cfecfabc5e23 | 71 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 72 | |
clemente | 0:cfecfabc5e23 | 73 | Active(); |
clemente | 0:cfecfabc5e23 | 74 | |
clemente | 0:cfecfabc5e23 | 75 | MPL3115A2_mode = ALTIMETER_MODE; |
clemente | 0:cfecfabc5e23 | 76 | } |
clemente | 0:cfecfabc5e23 | 77 | |
clemente | 0:cfecfabc5e23 | 78 | void MPL3115A2::Oversample_Ratio( unsigned int ratio) |
clemente | 0:cfecfabc5e23 | 79 | { |
clemente | 0:cfecfabc5e23 | 80 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 81 | |
clemente | 0:cfecfabc5e23 | 82 | Standby(); |
clemente | 0:cfecfabc5e23 | 83 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 84 | |
clemente | 0:cfecfabc5e23 | 85 | t = t & 0xE7; |
clemente | 0:cfecfabc5e23 | 86 | t = t | ( ratio<<3); |
clemente | 0:cfecfabc5e23 | 87 | |
clemente | 0:cfecfabc5e23 | 88 | unsigned char data[2] = { REG_CTRL_REG_1, t}; |
clemente | 0:cfecfabc5e23 | 89 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 90 | |
clemente | 0:cfecfabc5e23 | 91 | Active(); |
clemente | 0:cfecfabc5e23 | 92 | |
clemente | 0:cfecfabc5e23 | 93 | MPL3115A2_oversampling = ratio; |
clemente | 0:cfecfabc5e23 | 94 | } |
clemente | 0:cfecfabc5e23 | 95 | |
clemente | 0:cfecfabc5e23 | 96 | |
clemente | 0:cfecfabc5e23 | 97 | void MPL3115A2::Active( void) |
clemente | 0:cfecfabc5e23 | 98 | { |
clemente | 0:cfecfabc5e23 | 99 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 100 | |
clemente | 0:cfecfabc5e23 | 101 | // Activate the peripheral |
clemente | 0:cfecfabc5e23 | 102 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 103 | unsigned char data[2] = {REG_CTRL_REG_1, t|0x01}; |
clemente | 0:cfecfabc5e23 | 104 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 105 | } |
clemente | 0:cfecfabc5e23 | 106 | |
clemente | 0:cfecfabc5e23 | 107 | void MPL3115A2::Standby( void) |
clemente | 0:cfecfabc5e23 | 108 | { |
clemente | 0:cfecfabc5e23 | 109 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 110 | |
clemente | 0:cfecfabc5e23 | 111 | // Standby |
clemente | 0:cfecfabc5e23 | 112 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 113 | unsigned char data[2] = {REG_CTRL_REG_1, t&0xFE}; |
clemente | 0:cfecfabc5e23 | 114 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 115 | } |
clemente | 0:cfecfabc5e23 | 116 | |
clemente | 0:cfecfabc5e23 | 117 | unsigned char MPL3115A2::getDeviceID() { |
clemente | 0:cfecfabc5e23 | 118 | unsigned char device_id = 0; |
clemente | 0:cfecfabc5e23 | 119 | readRegs(REG_WHO_AM_I, &device_id, 1); |
clemente | 0:cfecfabc5e23 | 120 | return device_id; |
clemente | 0:cfecfabc5e23 | 121 | } |
clemente | 0:cfecfabc5e23 | 122 | |
clemente | 0:cfecfabc5e23 | 123 | unsigned int MPL3115A2::isDataAvailable( void) |
clemente | 0:cfecfabc5e23 | 124 | { |
clemente | 0:cfecfabc5e23 | 125 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 126 | |
clemente | 0:cfecfabc5e23 | 127 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 128 | |
clemente | 0:cfecfabc5e23 | 129 | if ( status & 0x08) { |
clemente | 0:cfecfabc5e23 | 130 | return 1; |
clemente | 0:cfecfabc5e23 | 131 | } else { |
clemente | 0:cfecfabc5e23 | 132 | return 0; |
clemente | 0:cfecfabc5e23 | 133 | } |
clemente | 0:cfecfabc5e23 | 134 | |
clemente | 0:cfecfabc5e23 | 135 | } |
clemente | 0:cfecfabc5e23 | 136 | |
clemente | 0:cfecfabc5e23 | 137 | unsigned char MPL3115A2::getStatus( void) |
clemente | 0:cfecfabc5e23 | 138 | { |
clemente | 0:cfecfabc5e23 | 139 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 140 | |
clemente | 0:cfecfabc5e23 | 141 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 142 | return status; |
clemente | 0:cfecfabc5e23 | 143 | } |
clemente | 0:cfecfabc5e23 | 144 | |
clemente | 0:cfecfabc5e23 | 145 | void MPL3115A2::getAllData( float *f) |
clemente | 0:cfecfabc5e23 | 146 | { |
clemente | 0:cfecfabc5e23 | 147 | if ( MPL3115A2_mode == ALTIMETER_MODE) { |
clemente | 0:cfecfabc5e23 | 148 | f[0] = getAltimeter(); |
clemente | 0:cfecfabc5e23 | 149 | } else { |
clemente | 0:cfecfabc5e23 | 150 | f[0] = getPressure(); |
clemente | 0:cfecfabc5e23 | 151 | } |
clemente | 0:cfecfabc5e23 | 152 | |
clemente | 0:cfecfabc5e23 | 153 | f[1] = getTemperature(); |
clemente | 0:cfecfabc5e23 | 154 | } |
clemente | 0:cfecfabc5e23 | 155 | |
clemente | 0:cfecfabc5e23 | 156 | float MPL3115A2::getAltimeter( void) |
clemente | 0:cfecfabc5e23 | 157 | { |
clemente | 0:cfecfabc5e23 | 158 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 159 | unsigned short altm; |
clemente | 0:cfecfabc5e23 | 160 | float faltm; |
clemente | 0:cfecfabc5e23 | 161 | |
clemente | 0:cfecfabc5e23 | 162 | /* |
clemente | 0:cfecfabc5e23 | 163 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 164 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 165 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 166 | */ |
clemente | 0:cfecfabc5e23 | 167 | readRegs( REG_ALTIMETER_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 168 | altm = (dt[0]<<8) | dt[1]; |
clemente | 0:cfecfabc5e23 | 169 | // |
clemente | 0:cfecfabc5e23 | 170 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 171 | altm = ~altm + 1; |
clemente | 0:cfecfabc5e23 | 172 | faltm = (float)altm * -1.0f; |
clemente | 0:cfecfabc5e23 | 173 | } else { |
clemente | 0:cfecfabc5e23 | 174 | faltm = (float)altm * 1.0f; |
clemente | 0:cfecfabc5e23 | 175 | } |
clemente | 0:cfecfabc5e23 | 176 | // |
clemente | 0:cfecfabc5e23 | 177 | faltm = faltm+((float)(dt[2]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 178 | return faltm; |
clemente | 0:cfecfabc5e23 | 179 | } |
clemente | 0:cfecfabc5e23 | 180 | |
clemente | 0:cfecfabc5e23 | 181 | float MPL3115A2::getPressure( void) |
clemente | 0:cfecfabc5e23 | 182 | { |
clemente | 0:cfecfabc5e23 | 183 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 184 | unsigned int prs; |
clemente | 0:cfecfabc5e23 | 185 | float fprs; |
clemente | 0:cfecfabc5e23 | 186 | |
clemente | 0:cfecfabc5e23 | 187 | /* |
clemente | 0:cfecfabc5e23 | 188 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 189 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 190 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 191 | */ |
clemente | 0:cfecfabc5e23 | 192 | readRegs( REG_PRESSURE_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 193 | prs = (dt[0]<<10) | (dt[1]<<2) | (dt[2]>>6); |
clemente | 0:cfecfabc5e23 | 194 | // |
clemente | 0:cfecfabc5e23 | 195 | fprs = (float)prs * 1.0f; |
clemente | 0:cfecfabc5e23 | 196 | |
clemente | 0:cfecfabc5e23 | 197 | if ( dt[2] & 0x20) |
clemente | 0:cfecfabc5e23 | 198 | fprs += 0.25f; |
clemente | 0:cfecfabc5e23 | 199 | if ( dt[2] & 0x10) |
clemente | 0:cfecfabc5e23 | 200 | fprs += 0.5f; |
clemente | 0:cfecfabc5e23 | 201 | |
clemente | 0:cfecfabc5e23 | 202 | return fprs; |
clemente | 0:cfecfabc5e23 | 203 | } |
clemente | 0:cfecfabc5e23 | 204 | |
clemente | 0:cfecfabc5e23 | 205 | |
clemente | 0:cfecfabc5e23 | 206 | float MPL3115A2::getTemperature( void) |
clemente | 0:cfecfabc5e23 | 207 | { |
clemente | 0:cfecfabc5e23 | 208 | unsigned char dt[2]; |
clemente | 0:cfecfabc5e23 | 209 | unsigned short temp; |
clemente | 0:cfecfabc5e23 | 210 | float ftemp; |
clemente | 0:cfecfabc5e23 | 211 | |
clemente | 0:cfecfabc5e23 | 212 | /* |
clemente | 0:cfecfabc5e23 | 213 | * dt[0] = Bits 4-11 of 16-bit real-time temperature sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 214 | * dt[1] = Bits 0-3 of 16-bit real-time temperature sample. (b7-b4) |
clemente | 0:cfecfabc5e23 | 215 | */ |
clemente | 0:cfecfabc5e23 | 216 | readRegs( REG_TEMP_MSB, &dt[0], 2); |
clemente | 0:cfecfabc5e23 | 217 | temp = dt[0]; |
clemente | 0:cfecfabc5e23 | 218 | // |
clemente | 0:cfecfabc5e23 | 219 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 220 | temp = ~temp + 1; |
clemente | 0:cfecfabc5e23 | 221 | ftemp = (float)temp * -1.0f; |
clemente | 0:cfecfabc5e23 | 222 | } else { |
clemente | 0:cfecfabc5e23 | 223 | ftemp = (float)temp * 1.0f; |
clemente | 0:cfecfabc5e23 | 224 | } |
clemente | 0:cfecfabc5e23 | 225 | // |
clemente | 0:cfecfabc5e23 | 226 | ftemp = ftemp+((float)(dt[1]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 227 | return ftemp; |
clemente | 0:cfecfabc5e23 | 228 | |
clemente | 0:cfecfabc5e23 | 229 | } |
clemente | 0:cfecfabc5e23 | 230 | |
clemente | 0:cfecfabc5e23 | 231 | void MPL3115A2::readRegs(int addr, uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 232 | char t[1] = {addr}; |
clemente | 0:cfecfabc5e23 | 233 | m_i2c.write(m_addr, t, 1, true); |
clemente | 0:cfecfabc5e23 | 234 | m_i2c.read(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 235 | } |
clemente | 0:cfecfabc5e23 | 236 | |
clemente | 0:cfecfabc5e23 | 237 | void MPL3115A2::writeRegs(uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 238 | m_i2c.write(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 239 | } |