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@4:fdf14a259af8, 2013-05-30 (annotated)
- Committer:
- clemente
- Date:
- Thu May 30 07:27:24 2013 +0000
- Revision:
- 4:fdf14a259af8
- Parent:
- 3:a2f1752add9a
- Child:
- 5:9edec5ee8bf4
Added and tested the data acquisition using Interrupt. Added code for Altimeter trigger Interrupt but not yet tested.
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 | 2:a2fcfb7ff611 | 3 | #define REG_WHO_AM_I 0x0C // return 0xC4 by default |
clemente | 0:cfecfabc5e23 | 4 | #define REG_STATUS 0x00 |
clemente | 0:cfecfabc5e23 | 5 | #define REG_CTRL_REG_1 0x26 |
clemente | 4:fdf14a259af8 | 6 | #define REG_CTRL_REG_3 0x28 |
clemente | 2:a2fcfb7ff611 | 7 | #define REG_CTRL_REG_4 0x29 |
clemente | 2:a2fcfb7ff611 | 8 | #define REG_CTRL_REG_5 0x2A |
clemente | 0:cfecfabc5e23 | 9 | #define REG_PRESSURE_MSB 0x01 // 3 byte pressure data |
clemente | 0:cfecfabc5e23 | 10 | #define REG_ALTIMETER_MSB 0x01 // 3 byte altimeter data |
clemente | 0:cfecfabc5e23 | 11 | #define REG_TEMP_MSB 0x04 // 2 byte temperature data |
clemente | 0:cfecfabc5e23 | 12 | #define REG_PT_DATA_CFG 0x13 |
clemente | 3:a2f1752add9a | 13 | #define REG_P_TGT_MSB 0x16 |
clemente | 3:a2f1752add9a | 14 | #define REG_P_WND_MSB 0x19 |
clemente | 0:cfecfabc5e23 | 15 | |
clemente | 0:cfecfabc5e23 | 16 | #define UINT14_MAX 16383 |
clemente | 0:cfecfabc5e23 | 17 | |
clemente | 3:a2f1752add9a | 18 | /** Interrupt schema |
clemente | 3:a2f1752add9a | 19 | * |
clemente | 3:a2f1752add9a | 20 | * :: The Altitude Trigger use the IRQ1. |
clemente | 3:a2f1752add9a | 21 | * |
clemente | 3:a2f1752add9a | 22 | * Altitude Trigger -- MPL3115A2_Int1.fall --- AltitudeTrg_IRQ --- user1_fptr |
clemente | 3:a2f1752add9a | 23 | * |
clemente | 3:a2f1752add9a | 24 | * |
clemente | 3:a2f1752add9a | 25 | * :: The Data ready use the IRQ2. |
clemente | 3:a2f1752add9a | 26 | * |
clemente | 3:a2f1752add9a | 27 | * Data Ready -- MPL3115A2_Int2.fall --- DataReady_IRQ --- user2_fptr |
clemente | 3:a2f1752add9a | 28 | * |
clemente | 3:a2f1752add9a | 29 | */ |
clemente | 2:a2fcfb7ff611 | 30 | void (*user2_fptr)(void); // Pointers to user function called after |
clemente | 2:a2fcfb7ff611 | 31 | void (*user1_fptr)(void); // IRQ assertion. |
clemente | 2:a2fcfb7ff611 | 32 | |
clemente | 2:a2fcfb7ff611 | 33 | // |
clemente | 2:a2fcfb7ff611 | 34 | InterruptIn MPL3115A2_Int1( PTD4); // INT1 |
clemente | 2:a2fcfb7ff611 | 35 | InterruptIn MPL3115A2_Int2( PTA12); // INT2 |
clemente | 2:a2fcfb7ff611 | 36 | |
clemente | 0:cfecfabc5e23 | 37 | MPL3115A2::MPL3115A2(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { |
clemente | 0:cfecfabc5e23 | 38 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 39 | MPL3115A2_oversampling = OVERSAMPLE_RATIO_1; |
clemente | 4:fdf14a259af8 | 40 | // |
clemente | 4:fdf14a259af8 | 41 | user1_fptr = NULL; |
clemente | 4:fdf14a259af8 | 42 | user2_fptr = NULL; |
clemente | 4:fdf14a259af8 | 43 | MPL3115A2_Int1.fall( NULL); |
clemente | 4:fdf14a259af8 | 44 | MPL3115A2_Int2.fall( NULL); |
clemente | 0:cfecfabc5e23 | 45 | } |
clemente | 0:cfecfabc5e23 | 46 | |
clemente | 2:a2fcfb7ff611 | 47 | void MPL3115A2::Reset( void) |
clemente | 2:a2fcfb7ff611 | 48 | { |
clemente | 2:a2fcfb7ff611 | 49 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 50 | |
clemente | 2:a2fcfb7ff611 | 51 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 52 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 2:a2fcfb7ff611 | 53 | unsigned char data[2] = { REG_CTRL_REG_1, t|0x04}; |
clemente | 2:a2fcfb7ff611 | 54 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 55 | wait( 0.1); |
clemente | 2:a2fcfb7ff611 | 56 | |
clemente | 2:a2fcfb7ff611 | 57 | } |
clemente | 2:a2fcfb7ff611 | 58 | |
clemente | 2:a2fcfb7ff611 | 59 | void MPL3115A2::DataReady( void(*fptr)(void), unsigned char OS) |
clemente | 2:a2fcfb7ff611 | 60 | { |
clemente | 2:a2fcfb7ff611 | 61 | unsigned char dt[5]; |
clemente | 2:a2fcfb7ff611 | 62 | unsigned char data[2]; |
clemente | 2:a2fcfb7ff611 | 63 | |
clemente | 4:fdf14a259af8 | 64 | // Soft Reset |
clemente | 2:a2fcfb7ff611 | 65 | Reset(); |
clemente | 2:a2fcfb7ff611 | 66 | |
clemente | 2:a2fcfb7ff611 | 67 | Standby(); |
clemente | 2:a2fcfb7ff611 | 68 | |
clemente | 4:fdf14a259af8 | 69 | // Clear all interrupts by reading the output registers. |
clemente | 2:a2fcfb7ff611 | 70 | readRegs( REG_ALTIMETER_MSB, &dt[0], 5); |
clemente | 2:a2fcfb7ff611 | 71 | getStatus(); |
clemente | 4:fdf14a259af8 | 72 | // Configure INT active low and pullup |
clemente | 4:fdf14a259af8 | 73 | data[0] = REG_CTRL_REG_3; |
clemente | 4:fdf14a259af8 | 74 | data[1] = 0x00; |
clemente | 4:fdf14a259af8 | 75 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 76 | // Enable Interrupt fot data ready |
clemente | 2:a2fcfb7ff611 | 77 | data[0] = REG_CTRL_REG_4; |
clemente | 2:a2fcfb7ff611 | 78 | data[1] = 0x80; |
clemente | 2:a2fcfb7ff611 | 79 | writeRegs(data, 2); |
clemente | 3:a2f1752add9a | 80 | // Configure Interrupt to route to INT2 |
clemente | 2:a2fcfb7ff611 | 81 | data[0] = REG_CTRL_REG_5; |
clemente | 2:a2fcfb7ff611 | 82 | data[1] = 0x00; |
clemente | 2:a2fcfb7ff611 | 83 | writeRegs(data, 2); |
clemente | 4:fdf14a259af8 | 84 | data[0] = REG_PT_DATA_CFG; |
clemente | 4:fdf14a259af8 | 85 | data[1] = 0x07; |
clemente | 4:fdf14a259af8 | 86 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 87 | |
clemente | 4:fdf14a259af8 | 88 | // Configure the OverSampling rate, Altimeter/Barometer mode and set the sensor Active |
clemente | 2:a2fcfb7ff611 | 89 | data[0] = REG_CTRL_REG_1; |
clemente | 4:fdf14a259af8 | 90 | data[1] = (OS<<3); |
clemente | 4:fdf14a259af8 | 91 | // |
clemente | 4:fdf14a259af8 | 92 | if (MPL3115A2_mode == BAROMETRIC_MODE) |
clemente | 4:fdf14a259af8 | 93 | data[1] &= 0x7F; |
clemente | 4:fdf14a259af8 | 94 | else |
clemente | 4:fdf14a259af8 | 95 | data[1] |= 0x80; |
clemente | 4:fdf14a259af8 | 96 | // |
clemente | 4:fdf14a259af8 | 97 | data[1] |= 0x01; |
clemente | 2:a2fcfb7ff611 | 98 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 99 | |
clemente | 2:a2fcfb7ff611 | 100 | user2_fptr = fptr; |
clemente | 2:a2fcfb7ff611 | 101 | MPL3115A2_Int2.fall( this, &MPL3115A2::DataReady_IRQ); |
clemente | 2:a2fcfb7ff611 | 102 | |
clemente | 2:a2fcfb7ff611 | 103 | } |
clemente | 2:a2fcfb7ff611 | 104 | |
clemente | 2:a2fcfb7ff611 | 105 | void MPL3115A2::DataReady_IRQ( void) |
clemente | 2:a2fcfb7ff611 | 106 | { |
clemente | 2:a2fcfb7ff611 | 107 | // Clear the IRQ flag |
clemente | 2:a2fcfb7ff611 | 108 | getStatus(); |
clemente | 2:a2fcfb7ff611 | 109 | // Run the user supplied function |
clemente | 2:a2fcfb7ff611 | 110 | user2_fptr(); |
clemente | 2:a2fcfb7ff611 | 111 | } |
clemente | 2:a2fcfb7ff611 | 112 | |
clemente | 3:a2f1752add9a | 113 | void MPL3115A2::AltitudeTrigger( void(*fptr)(void), unsigned short level) |
clemente | 3:a2f1752add9a | 114 | { |
clemente | 3:a2f1752add9a | 115 | unsigned char dt[5]; |
clemente | 3:a2f1752add9a | 116 | unsigned char data[2]; |
clemente | 3:a2f1752add9a | 117 | |
clemente | 3:a2f1752add9a | 118 | // Soft Reset |
clemente | 3:a2f1752add9a | 119 | Reset(); |
clemente | 3:a2f1752add9a | 120 | |
clemente | 3:a2f1752add9a | 121 | // The device is on standby |
clemente | 3:a2f1752add9a | 122 | Standby(); |
clemente | 3:a2f1752add9a | 123 | |
clemente | 3:a2f1752add9a | 124 | // Clear all interrupts by reading the output registers. |
clemente | 3:a2f1752add9a | 125 | readRegs( REG_ALTIMETER_MSB, &dt[0], 5); |
clemente | 3:a2f1752add9a | 126 | getStatus(); |
clemente | 3:a2f1752add9a | 127 | |
clemente | 3:a2f1752add9a | 128 | // Write Target and Window Values |
clemente | 4:fdf14a259af8 | 129 | dt[0] = REG_P_TGT_MSB; |
clemente | 4:fdf14a259af8 | 130 | dt[1] = (level>>8); |
clemente | 4:fdf14a259af8 | 131 | dt[2] = (level&0xFF); |
clemente | 4:fdf14a259af8 | 132 | writeRegs( dt, 3); |
clemente | 3:a2f1752add9a | 133 | |
clemente | 3:a2f1752add9a | 134 | // Window values are zero |
clemente | 4:fdf14a259af8 | 135 | dt[0] = REG_P_WND_MSB; |
clemente | 4:fdf14a259af8 | 136 | dt[1] = 0; |
clemente | 4:fdf14a259af8 | 137 | dt[2] = 0; |
clemente | 4:fdf14a259af8 | 138 | writeRegs( dt, 3); |
clemente | 3:a2f1752add9a | 139 | |
clemente | 3:a2f1752add9a | 140 | // Enable Pressure Threshold interrupt |
clemente | 3:a2f1752add9a | 141 | data[0] = REG_CTRL_REG_4; |
clemente | 3:a2f1752add9a | 142 | data[1] = 0x08; |
clemente | 3:a2f1752add9a | 143 | writeRegs( data, 2); |
clemente | 3:a2f1752add9a | 144 | // Interrupt is routed to INT1 |
clemente | 3:a2f1752add9a | 145 | data[0] = REG_CTRL_REG_5; |
clemente | 3:a2f1752add9a | 146 | data[1] = 0x08; |
clemente | 3:a2f1752add9a | 147 | writeRegs( data, 2); |
clemente | 4:fdf14a259af8 | 148 | data[0] = REG_PT_DATA_CFG; |
clemente | 4:fdf14a259af8 | 149 | data[1] = 0x07; |
clemente | 4:fdf14a259af8 | 150 | writeRegs(data, 2); |
clemente | 4:fdf14a259af8 | 151 | // Configure the OverSampling rate, Altimeter mode and set the sensor Active |
clemente | 4:fdf14a259af8 | 152 | data[0] = REG_CTRL_REG_1; |
clemente | 4:fdf14a259af8 | 153 | data[1] = 0x81 | (MPL3115A2_oversampling<<3); |
clemente | 4:fdf14a259af8 | 154 | writeRegs(data, 2); |
clemente | 3:a2f1752add9a | 155 | |
clemente | 3:a2f1752add9a | 156 | user1_fptr = fptr; |
clemente | 3:a2f1752add9a | 157 | MPL3115A2_Int1.fall( this, &MPL3115A2::AltitudeTrg_IRQ); |
clemente | 3:a2f1752add9a | 158 | |
clemente | 3:a2f1752add9a | 159 | } |
clemente | 3:a2f1752add9a | 160 | |
clemente | 3:a2f1752add9a | 161 | void MPL3115A2::AltitudeTrg_IRQ( void) |
clemente | 3:a2f1752add9a | 162 | { |
clemente | 3:a2f1752add9a | 163 | // Clear the IRQ flag |
clemente | 3:a2f1752add9a | 164 | getStatus(); |
clemente | 3:a2f1752add9a | 165 | // Run the user supplied function |
clemente | 3:a2f1752add9a | 166 | user1_fptr(); |
clemente | 3:a2f1752add9a | 167 | |
clemente | 3:a2f1752add9a | 168 | } |
clemente | 3:a2f1752add9a | 169 | |
clemente | 0:cfecfabc5e23 | 170 | void MPL3115A2::Barometric_Mode( void) |
clemente | 0:cfecfabc5e23 | 171 | { |
clemente | 0:cfecfabc5e23 | 172 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 173 | unsigned char data[2]; |
clemente | 0:cfecfabc5e23 | 174 | |
clemente | 0:cfecfabc5e23 | 175 | Standby(); |
clemente | 0:cfecfabc5e23 | 176 | |
clemente | 0:cfecfabc5e23 | 177 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 178 | Reset(); |
clemente | 2:a2fcfb7ff611 | 179 | |
clemente | 0:cfecfabc5e23 | 180 | Standby(); |
clemente | 0:cfecfabc5e23 | 181 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 182 | |
clemente | 2:a2fcfb7ff611 | 183 | // Set the Barometric mode |
clemente | 0:cfecfabc5e23 | 184 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 185 | data[1] = t&0x7F; |
clemente | 0:cfecfabc5e23 | 186 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 187 | |
clemente | 0:cfecfabc5e23 | 188 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 189 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 190 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 191 | |
clemente | 0:cfecfabc5e23 | 192 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 193 | |
clemente | 0:cfecfabc5e23 | 194 | Active(); |
clemente | 0:cfecfabc5e23 | 195 | |
clemente | 0:cfecfabc5e23 | 196 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 197 | } |
clemente | 0:cfecfabc5e23 | 198 | |
clemente | 0:cfecfabc5e23 | 199 | void MPL3115A2::Altimeter_Mode( void) |
clemente | 0:cfecfabc5e23 | 200 | { |
clemente | 0:cfecfabc5e23 | 201 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 202 | unsigned char data[2]; |
clemente | 2:a2fcfb7ff611 | 203 | |
clemente | 0:cfecfabc5e23 | 204 | Standby(); |
clemente | 0:cfecfabc5e23 | 205 | |
clemente | 0:cfecfabc5e23 | 206 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 207 | Reset(); |
clemente | 0:cfecfabc5e23 | 208 | |
clemente | 0:cfecfabc5e23 | 209 | Standby(); |
clemente | 0:cfecfabc5e23 | 210 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 211 | |
clemente | 0:cfecfabc5e23 | 212 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 213 | data[1] = t|0x80; |
clemente | 0:cfecfabc5e23 | 214 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 215 | |
clemente | 0:cfecfabc5e23 | 216 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 217 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 218 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 219 | |
clemente | 0:cfecfabc5e23 | 220 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 221 | |
clemente | 0:cfecfabc5e23 | 222 | Active(); |
clemente | 0:cfecfabc5e23 | 223 | |
clemente | 0:cfecfabc5e23 | 224 | MPL3115A2_mode = ALTIMETER_MODE; |
clemente | 0:cfecfabc5e23 | 225 | } |
clemente | 0:cfecfabc5e23 | 226 | |
clemente | 0:cfecfabc5e23 | 227 | void MPL3115A2::Oversample_Ratio( unsigned int ratio) |
clemente | 0:cfecfabc5e23 | 228 | { |
clemente | 0:cfecfabc5e23 | 229 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 230 | |
clemente | 0:cfecfabc5e23 | 231 | Standby(); |
clemente | 0:cfecfabc5e23 | 232 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 233 | |
clemente | 0:cfecfabc5e23 | 234 | t = t & 0xE7; |
clemente | 0:cfecfabc5e23 | 235 | t = t | ( ratio<<3); |
clemente | 0:cfecfabc5e23 | 236 | |
clemente | 0:cfecfabc5e23 | 237 | unsigned char data[2] = { REG_CTRL_REG_1, t}; |
clemente | 0:cfecfabc5e23 | 238 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 239 | |
clemente | 0:cfecfabc5e23 | 240 | Active(); |
clemente | 0:cfecfabc5e23 | 241 | |
clemente | 0:cfecfabc5e23 | 242 | MPL3115A2_oversampling = ratio; |
clemente | 0:cfecfabc5e23 | 243 | } |
clemente | 0:cfecfabc5e23 | 244 | |
clemente | 0:cfecfabc5e23 | 245 | |
clemente | 0:cfecfabc5e23 | 246 | void MPL3115A2::Active( void) |
clemente | 0:cfecfabc5e23 | 247 | { |
clemente | 0:cfecfabc5e23 | 248 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 249 | |
clemente | 0:cfecfabc5e23 | 250 | // Activate the peripheral |
clemente | 0:cfecfabc5e23 | 251 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 252 | unsigned char data[2] = {REG_CTRL_REG_1, t|0x01}; |
clemente | 0:cfecfabc5e23 | 253 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 254 | } |
clemente | 0:cfecfabc5e23 | 255 | |
clemente | 0:cfecfabc5e23 | 256 | void MPL3115A2::Standby( void) |
clemente | 0:cfecfabc5e23 | 257 | { |
clemente | 0:cfecfabc5e23 | 258 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 259 | |
clemente | 0:cfecfabc5e23 | 260 | // Standby |
clemente | 0:cfecfabc5e23 | 261 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 262 | unsigned char data[2] = {REG_CTRL_REG_1, t&0xFE}; |
clemente | 0:cfecfabc5e23 | 263 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 264 | } |
clemente | 0:cfecfabc5e23 | 265 | |
clemente | 0:cfecfabc5e23 | 266 | unsigned char MPL3115A2::getDeviceID() { |
clemente | 0:cfecfabc5e23 | 267 | unsigned char device_id = 0; |
clemente | 0:cfecfabc5e23 | 268 | readRegs(REG_WHO_AM_I, &device_id, 1); |
clemente | 0:cfecfabc5e23 | 269 | return device_id; |
clemente | 0:cfecfabc5e23 | 270 | } |
clemente | 0:cfecfabc5e23 | 271 | |
clemente | 0:cfecfabc5e23 | 272 | unsigned int MPL3115A2::isDataAvailable( void) |
clemente | 0:cfecfabc5e23 | 273 | { |
clemente | 0:cfecfabc5e23 | 274 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 275 | |
clemente | 0:cfecfabc5e23 | 276 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 277 | |
clemente | 0:cfecfabc5e23 | 278 | if ( status & 0x08) { |
clemente | 0:cfecfabc5e23 | 279 | return 1; |
clemente | 0:cfecfabc5e23 | 280 | } else { |
clemente | 0:cfecfabc5e23 | 281 | return 0; |
clemente | 0:cfecfabc5e23 | 282 | } |
clemente | 0:cfecfabc5e23 | 283 | |
clemente | 0:cfecfabc5e23 | 284 | } |
clemente | 0:cfecfabc5e23 | 285 | |
clemente | 0:cfecfabc5e23 | 286 | unsigned char MPL3115A2::getStatus( void) |
clemente | 0:cfecfabc5e23 | 287 | { |
clemente | 0:cfecfabc5e23 | 288 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 289 | |
clemente | 0:cfecfabc5e23 | 290 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 291 | return status; |
clemente | 0:cfecfabc5e23 | 292 | } |
clemente | 0:cfecfabc5e23 | 293 | |
clemente | 0:cfecfabc5e23 | 294 | void MPL3115A2::getAllData( float *f) |
clemente | 0:cfecfabc5e23 | 295 | { |
clemente | 0:cfecfabc5e23 | 296 | if ( MPL3115A2_mode == ALTIMETER_MODE) { |
clemente | 0:cfecfabc5e23 | 297 | f[0] = getAltimeter(); |
clemente | 0:cfecfabc5e23 | 298 | } else { |
clemente | 0:cfecfabc5e23 | 299 | f[0] = getPressure(); |
clemente | 0:cfecfabc5e23 | 300 | } |
clemente | 0:cfecfabc5e23 | 301 | |
clemente | 0:cfecfabc5e23 | 302 | f[1] = getTemperature(); |
clemente | 0:cfecfabc5e23 | 303 | } |
clemente | 0:cfecfabc5e23 | 304 | |
clemente | 0:cfecfabc5e23 | 305 | float MPL3115A2::getAltimeter( void) |
clemente | 0:cfecfabc5e23 | 306 | { |
clemente | 0:cfecfabc5e23 | 307 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 308 | unsigned short altm; |
clemente | 0:cfecfabc5e23 | 309 | float faltm; |
clemente | 0:cfecfabc5e23 | 310 | |
clemente | 0:cfecfabc5e23 | 311 | /* |
clemente | 0:cfecfabc5e23 | 312 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 313 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 314 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 315 | */ |
clemente | 0:cfecfabc5e23 | 316 | readRegs( REG_ALTIMETER_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 317 | altm = (dt[0]<<8) | dt[1]; |
clemente | 0:cfecfabc5e23 | 318 | // |
clemente | 0:cfecfabc5e23 | 319 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 320 | altm = ~altm + 1; |
clemente | 0:cfecfabc5e23 | 321 | faltm = (float)altm * -1.0f; |
clemente | 0:cfecfabc5e23 | 322 | } else { |
clemente | 0:cfecfabc5e23 | 323 | faltm = (float)altm * 1.0f; |
clemente | 0:cfecfabc5e23 | 324 | } |
clemente | 0:cfecfabc5e23 | 325 | // |
clemente | 0:cfecfabc5e23 | 326 | faltm = faltm+((float)(dt[2]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 327 | return faltm; |
clemente | 0:cfecfabc5e23 | 328 | } |
clemente | 0:cfecfabc5e23 | 329 | |
clemente | 0:cfecfabc5e23 | 330 | float MPL3115A2::getPressure( void) |
clemente | 0:cfecfabc5e23 | 331 | { |
clemente | 0:cfecfabc5e23 | 332 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 333 | unsigned int prs; |
clemente | 0:cfecfabc5e23 | 334 | float fprs; |
clemente | 0:cfecfabc5e23 | 335 | |
clemente | 0:cfecfabc5e23 | 336 | /* |
clemente | 0:cfecfabc5e23 | 337 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 338 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 339 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 340 | */ |
clemente | 0:cfecfabc5e23 | 341 | readRegs( REG_PRESSURE_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 342 | prs = (dt[0]<<10) | (dt[1]<<2) | (dt[2]>>6); |
clemente | 0:cfecfabc5e23 | 343 | // |
clemente | 0:cfecfabc5e23 | 344 | fprs = (float)prs * 1.0f; |
clemente | 0:cfecfabc5e23 | 345 | |
clemente | 0:cfecfabc5e23 | 346 | if ( dt[2] & 0x20) |
clemente | 0:cfecfabc5e23 | 347 | fprs += 0.25f; |
clemente | 0:cfecfabc5e23 | 348 | if ( dt[2] & 0x10) |
clemente | 0:cfecfabc5e23 | 349 | fprs += 0.5f; |
clemente | 0:cfecfabc5e23 | 350 | |
clemente | 0:cfecfabc5e23 | 351 | return fprs; |
clemente | 0:cfecfabc5e23 | 352 | } |
clemente | 0:cfecfabc5e23 | 353 | |
clemente | 0:cfecfabc5e23 | 354 | |
clemente | 0:cfecfabc5e23 | 355 | float MPL3115A2::getTemperature( void) |
clemente | 0:cfecfabc5e23 | 356 | { |
clemente | 0:cfecfabc5e23 | 357 | unsigned char dt[2]; |
clemente | 0:cfecfabc5e23 | 358 | unsigned short temp; |
clemente | 0:cfecfabc5e23 | 359 | float ftemp; |
clemente | 0:cfecfabc5e23 | 360 | |
clemente | 0:cfecfabc5e23 | 361 | /* |
clemente | 0:cfecfabc5e23 | 362 | * dt[0] = Bits 4-11 of 16-bit real-time temperature sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 363 | * dt[1] = Bits 0-3 of 16-bit real-time temperature sample. (b7-b4) |
clemente | 0:cfecfabc5e23 | 364 | */ |
clemente | 0:cfecfabc5e23 | 365 | readRegs( REG_TEMP_MSB, &dt[0], 2); |
clemente | 0:cfecfabc5e23 | 366 | temp = dt[0]; |
clemente | 0:cfecfabc5e23 | 367 | // |
clemente | 0:cfecfabc5e23 | 368 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 369 | temp = ~temp + 1; |
clemente | 0:cfecfabc5e23 | 370 | ftemp = (float)temp * -1.0f; |
clemente | 0:cfecfabc5e23 | 371 | } else { |
clemente | 0:cfecfabc5e23 | 372 | ftemp = (float)temp * 1.0f; |
clemente | 0:cfecfabc5e23 | 373 | } |
clemente | 0:cfecfabc5e23 | 374 | // |
clemente | 0:cfecfabc5e23 | 375 | ftemp = ftemp+((float)(dt[1]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 376 | return ftemp; |
clemente | 0:cfecfabc5e23 | 377 | |
clemente | 0:cfecfabc5e23 | 378 | } |
clemente | 0:cfecfabc5e23 | 379 | |
clemente | 0:cfecfabc5e23 | 380 | void MPL3115A2::readRegs(int addr, uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 381 | char t[1] = {addr}; |
clemente | 0:cfecfabc5e23 | 382 | m_i2c.write(m_addr, t, 1, true); |
clemente | 0:cfecfabc5e23 | 383 | m_i2c.read(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 384 | } |
clemente | 0:cfecfabc5e23 | 385 | |
clemente | 0:cfecfabc5e23 | 386 | void MPL3115A2::writeRegs(uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 387 | m_i2c.write(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 388 | } |