pressure
Fork of MPL3115A2 by
MPL3115A2.cpp@3:a2f1752add9a, 2013-05-29 (annotated)
- Committer:
- clemente
- Date:
- Wed May 29 11:56:52 2013 +0000
- Revision:
- 3:a2f1752add9a
- Parent:
- 2:a2fcfb7ff611
- Child:
- 4:fdf14a259af8
Code for Altitude trigger and data ready using IRQ. To be 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 | 2:a2fcfb7ff611 | 6 | #define REG_CTRL_REG_4 0x29 |
clemente | 2:a2fcfb7ff611 | 7 | #define REG_CTRL_REG_5 0x2A |
clemente | 0:cfecfabc5e23 | 8 | #define REG_PRESSURE_MSB 0x01 // 3 byte pressure data |
clemente | 0:cfecfabc5e23 | 9 | #define REG_ALTIMETER_MSB 0x01 // 3 byte altimeter data |
clemente | 0:cfecfabc5e23 | 10 | #define REG_TEMP_MSB 0x04 // 2 byte temperature data |
clemente | 0:cfecfabc5e23 | 11 | #define REG_PT_DATA_CFG 0x13 |
clemente | 3:a2f1752add9a | 12 | #define REG_P_TGT_MSB 0x16 |
clemente | 3:a2f1752add9a | 13 | #define REG_P_WND_MSB 0x19 |
clemente | 0:cfecfabc5e23 | 14 | |
clemente | 0:cfecfabc5e23 | 15 | #define UINT14_MAX 16383 |
clemente | 0:cfecfabc5e23 | 16 | |
clemente | 3:a2f1752add9a | 17 | /** Interrupt schema |
clemente | 3:a2f1752add9a | 18 | * |
clemente | 3:a2f1752add9a | 19 | * :: The Altitude Trigger use the IRQ1. |
clemente | 3:a2f1752add9a | 20 | * |
clemente | 3:a2f1752add9a | 21 | * Altitude Trigger -- MPL3115A2_Int1.fall --- AltitudeTrg_IRQ --- user1_fptr |
clemente | 3:a2f1752add9a | 22 | * |
clemente | 3:a2f1752add9a | 23 | * |
clemente | 3:a2f1752add9a | 24 | * :: The Data ready use the IRQ2. |
clemente | 3:a2f1752add9a | 25 | * |
clemente | 3:a2f1752add9a | 26 | * Data Ready -- MPL3115A2_Int2.fall --- DataReady_IRQ --- user2_fptr |
clemente | 3:a2f1752add9a | 27 | * |
clemente | 3:a2f1752add9a | 28 | */ |
clemente | 2:a2fcfb7ff611 | 29 | void (*user2_fptr)(void); // Pointers to user function called after |
clemente | 2:a2fcfb7ff611 | 30 | void (*user1_fptr)(void); // IRQ assertion. |
clemente | 2:a2fcfb7ff611 | 31 | |
clemente | 2:a2fcfb7ff611 | 32 | // |
clemente | 2:a2fcfb7ff611 | 33 | InterruptIn MPL3115A2_Int1( PTD4); // INT1 |
clemente | 2:a2fcfb7ff611 | 34 | InterruptIn MPL3115A2_Int2( PTA12); // INT2 |
clemente | 2:a2fcfb7ff611 | 35 | |
clemente | 0:cfecfabc5e23 | 36 | MPL3115A2::MPL3115A2(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { |
clemente | 0:cfecfabc5e23 | 37 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 38 | MPL3115A2_oversampling = OVERSAMPLE_RATIO_1; |
clemente | 0:cfecfabc5e23 | 39 | } |
clemente | 0:cfecfabc5e23 | 40 | |
clemente | 2:a2fcfb7ff611 | 41 | void MPL3115A2::Reset( void) |
clemente | 2:a2fcfb7ff611 | 42 | { |
clemente | 2:a2fcfb7ff611 | 43 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 44 | |
clemente | 2:a2fcfb7ff611 | 45 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 46 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 2:a2fcfb7ff611 | 47 | unsigned char data[2] = { REG_CTRL_REG_1, t|0x04}; |
clemente | 2:a2fcfb7ff611 | 48 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 49 | wait( 0.1); |
clemente | 2:a2fcfb7ff611 | 50 | |
clemente | 2:a2fcfb7ff611 | 51 | } |
clemente | 2:a2fcfb7ff611 | 52 | |
clemente | 2:a2fcfb7ff611 | 53 | void MPL3115A2::DataReady( void(*fptr)(void), unsigned char OS) |
clemente | 2:a2fcfb7ff611 | 54 | { |
clemente | 2:a2fcfb7ff611 | 55 | unsigned char dt[5]; |
clemente | 2:a2fcfb7ff611 | 56 | unsigned char data[2]; |
clemente | 2:a2fcfb7ff611 | 57 | |
clemente | 2:a2fcfb7ff611 | 58 | Reset(); |
clemente | 2:a2fcfb7ff611 | 59 | |
clemente | 2:a2fcfb7ff611 | 60 | /* |
clemente | 2:a2fcfb7ff611 | 61 | ** Read contents of CTRL_REG_1 |
clemente | 2:a2fcfb7ff611 | 62 | ** Clear SBYB mask while holding all other values of CTRL_REG_1. |
clemente | 2:a2fcfb7ff611 | 63 | ** To put part into Standby mode |
clemente | 2:a2fcfb7ff611 | 64 | */ |
clemente | 2:a2fcfb7ff611 | 65 | Standby(); |
clemente | 2:a2fcfb7ff611 | 66 | |
clemente | 2:a2fcfb7ff611 | 67 | /* |
clemente | 2:a2fcfb7ff611 | 68 | ** Clear all interrupts by reading the output registers. |
clemente | 2:a2fcfb7ff611 | 69 | ** Activate sensor in Altimeter mode. |
clemente | 2:a2fcfb7ff611 | 70 | */ |
clemente | 2:a2fcfb7ff611 | 71 | readRegs( REG_ALTIMETER_MSB, &dt[0], 5); |
clemente | 2:a2fcfb7ff611 | 72 | getStatus(); |
clemente | 2:a2fcfb7ff611 | 73 | // Enable Interrupt fot data ready |
clemente | 2:a2fcfb7ff611 | 74 | data[0] = REG_CTRL_REG_4; |
clemente | 2:a2fcfb7ff611 | 75 | data[1] = 0x80; |
clemente | 2:a2fcfb7ff611 | 76 | writeRegs(data, 2); |
clemente | 3:a2f1752add9a | 77 | // Configure Interrupt to route to INT2 |
clemente | 2:a2fcfb7ff611 | 78 | data[0] = REG_CTRL_REG_5; |
clemente | 2:a2fcfb7ff611 | 79 | data[1] = 0x00; |
clemente | 2:a2fcfb7ff611 | 80 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 81 | |
clemente | 2:a2fcfb7ff611 | 82 | /* |
clemente | 3:a2f1752add9a | 83 | ** Configure the OverSampling rate, Altimeter mode and set the sensor Active |
clemente | 2:a2fcfb7ff611 | 84 | */ |
clemente | 2:a2fcfb7ff611 | 85 | data[0] = REG_CTRL_REG_1; |
clemente | 2:a2fcfb7ff611 | 86 | data[1] = 0x81 | (OS<<3); |
clemente | 2:a2fcfb7ff611 | 87 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 88 | |
clemente | 2:a2fcfb7ff611 | 89 | user2_fptr = fptr; |
clemente | 2:a2fcfb7ff611 | 90 | MPL3115A2_Int2.fall( this, &MPL3115A2::DataReady_IRQ); |
clemente | 2:a2fcfb7ff611 | 91 | |
clemente | 2:a2fcfb7ff611 | 92 | } |
clemente | 2:a2fcfb7ff611 | 93 | |
clemente | 2:a2fcfb7ff611 | 94 | void MPL3115A2::DataReady_IRQ( void) |
clemente | 2:a2fcfb7ff611 | 95 | { |
clemente | 2:a2fcfb7ff611 | 96 | // Clear the IRQ flag |
clemente | 2:a2fcfb7ff611 | 97 | getStatus(); |
clemente | 2:a2fcfb7ff611 | 98 | // Run the user supplied function |
clemente | 2:a2fcfb7ff611 | 99 | user2_fptr(); |
clemente | 2:a2fcfb7ff611 | 100 | } |
clemente | 2:a2fcfb7ff611 | 101 | |
clemente | 3:a2f1752add9a | 102 | void MPL3115A2::AltitudeTrigger( void(*fptr)(void), unsigned short level) |
clemente | 3:a2f1752add9a | 103 | { |
clemente | 3:a2f1752add9a | 104 | unsigned char dt[5]; |
clemente | 3:a2f1752add9a | 105 | unsigned char data[2]; |
clemente | 3:a2f1752add9a | 106 | |
clemente | 3:a2f1752add9a | 107 | // Soft Reset |
clemente | 3:a2f1752add9a | 108 | Reset(); |
clemente | 3:a2f1752add9a | 109 | |
clemente | 3:a2f1752add9a | 110 | // The device is on standby |
clemente | 3:a2f1752add9a | 111 | Standby(); |
clemente | 3:a2f1752add9a | 112 | |
clemente | 3:a2f1752add9a | 113 | // Clear all interrupts by reading the output registers. |
clemente | 3:a2f1752add9a | 114 | readRegs( REG_ALTIMETER_MSB, &dt[0], 5); |
clemente | 3:a2f1752add9a | 115 | getStatus(); |
clemente | 3:a2f1752add9a | 116 | |
clemente | 3:a2f1752add9a | 117 | // Write Target and Window Values |
clemente | 3:a2f1752add9a | 118 | data[0] = (level<<8); |
clemente | 3:a2f1752add9a | 119 | data[1] = (level&0xFF); |
clemente | 3:a2f1752add9a | 120 | writeRegs( data, 2); |
clemente | 3:a2f1752add9a | 121 | |
clemente | 3:a2f1752add9a | 122 | // Window values are zero |
clemente | 3:a2f1752add9a | 123 | data[0] = 0; |
clemente | 3:a2f1752add9a | 124 | data[1] = 0; |
clemente | 3:a2f1752add9a | 125 | writeRegs( data, 2); |
clemente | 3:a2f1752add9a | 126 | |
clemente | 3:a2f1752add9a | 127 | // Enable Pressure Threshold interrupt |
clemente | 3:a2f1752add9a | 128 | data[0] = REG_CTRL_REG_4; |
clemente | 3:a2f1752add9a | 129 | data[1] = 0x08; |
clemente | 3:a2f1752add9a | 130 | writeRegs( data, 2); |
clemente | 3:a2f1752add9a | 131 | // Interrupt is routed to INT1 |
clemente | 3:a2f1752add9a | 132 | data[0] = REG_CTRL_REG_5; |
clemente | 3:a2f1752add9a | 133 | data[1] = 0x08; |
clemente | 3:a2f1752add9a | 134 | writeRegs( data, 2); |
clemente | 3:a2f1752add9a | 135 | |
clemente | 3:a2f1752add9a | 136 | Active(); |
clemente | 3:a2f1752add9a | 137 | |
clemente | 3:a2f1752add9a | 138 | user1_fptr = fptr; |
clemente | 3:a2f1752add9a | 139 | MPL3115A2_Int1.fall( this, &MPL3115A2::AltitudeTrg_IRQ); |
clemente | 3:a2f1752add9a | 140 | |
clemente | 3:a2f1752add9a | 141 | } |
clemente | 3:a2f1752add9a | 142 | |
clemente | 3:a2f1752add9a | 143 | void MPL3115A2::AltitudeTrg_IRQ( void) |
clemente | 3:a2f1752add9a | 144 | { |
clemente | 3:a2f1752add9a | 145 | // Clear the IRQ flag |
clemente | 3:a2f1752add9a | 146 | getStatus(); |
clemente | 3:a2f1752add9a | 147 | // Run the user supplied function |
clemente | 3:a2f1752add9a | 148 | user1_fptr(); |
clemente | 3:a2f1752add9a | 149 | |
clemente | 3:a2f1752add9a | 150 | } |
clemente | 3:a2f1752add9a | 151 | |
clemente | 0:cfecfabc5e23 | 152 | void MPL3115A2::Barometric_Mode( void) |
clemente | 0:cfecfabc5e23 | 153 | { |
clemente | 0:cfecfabc5e23 | 154 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 155 | unsigned char data[2]; |
clemente | 0:cfecfabc5e23 | 156 | |
clemente | 0:cfecfabc5e23 | 157 | Standby(); |
clemente | 0:cfecfabc5e23 | 158 | |
clemente | 0:cfecfabc5e23 | 159 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 160 | Reset(); |
clemente | 2:a2fcfb7ff611 | 161 | |
clemente | 0:cfecfabc5e23 | 162 | Standby(); |
clemente | 0:cfecfabc5e23 | 163 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 164 | |
clemente | 2:a2fcfb7ff611 | 165 | // Set the Barometric mode |
clemente | 0:cfecfabc5e23 | 166 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 167 | data[1] = t&0x7F; |
clemente | 0:cfecfabc5e23 | 168 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 169 | |
clemente | 0:cfecfabc5e23 | 170 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 171 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 172 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 173 | |
clemente | 0:cfecfabc5e23 | 174 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 175 | |
clemente | 0:cfecfabc5e23 | 176 | Active(); |
clemente | 0:cfecfabc5e23 | 177 | |
clemente | 0:cfecfabc5e23 | 178 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 179 | } |
clemente | 0:cfecfabc5e23 | 180 | |
clemente | 0:cfecfabc5e23 | 181 | void MPL3115A2::Altimeter_Mode( void) |
clemente | 0:cfecfabc5e23 | 182 | { |
clemente | 0:cfecfabc5e23 | 183 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 184 | unsigned char data[2]; |
clemente | 2:a2fcfb7ff611 | 185 | |
clemente | 0:cfecfabc5e23 | 186 | Standby(); |
clemente | 0:cfecfabc5e23 | 187 | |
clemente | 0:cfecfabc5e23 | 188 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 189 | Reset(); |
clemente | 0:cfecfabc5e23 | 190 | |
clemente | 0:cfecfabc5e23 | 191 | Standby(); |
clemente | 0:cfecfabc5e23 | 192 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 193 | |
clemente | 0:cfecfabc5e23 | 194 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 195 | data[1] = t|0x80; |
clemente | 0:cfecfabc5e23 | 196 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 197 | |
clemente | 0:cfecfabc5e23 | 198 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 199 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 200 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 201 | |
clemente | 0:cfecfabc5e23 | 202 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 203 | |
clemente | 0:cfecfabc5e23 | 204 | Active(); |
clemente | 0:cfecfabc5e23 | 205 | |
clemente | 0:cfecfabc5e23 | 206 | MPL3115A2_mode = ALTIMETER_MODE; |
clemente | 0:cfecfabc5e23 | 207 | } |
clemente | 0:cfecfabc5e23 | 208 | |
clemente | 0:cfecfabc5e23 | 209 | void MPL3115A2::Oversample_Ratio( unsigned int ratio) |
clemente | 0:cfecfabc5e23 | 210 | { |
clemente | 0:cfecfabc5e23 | 211 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 212 | |
clemente | 0:cfecfabc5e23 | 213 | Standby(); |
clemente | 0:cfecfabc5e23 | 214 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 215 | |
clemente | 0:cfecfabc5e23 | 216 | t = t & 0xE7; |
clemente | 0:cfecfabc5e23 | 217 | t = t | ( ratio<<3); |
clemente | 0:cfecfabc5e23 | 218 | |
clemente | 0:cfecfabc5e23 | 219 | unsigned char data[2] = { REG_CTRL_REG_1, t}; |
clemente | 0:cfecfabc5e23 | 220 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 221 | |
clemente | 0:cfecfabc5e23 | 222 | Active(); |
clemente | 0:cfecfabc5e23 | 223 | |
clemente | 0:cfecfabc5e23 | 224 | MPL3115A2_oversampling = ratio; |
clemente | 0:cfecfabc5e23 | 225 | } |
clemente | 0:cfecfabc5e23 | 226 | |
clemente | 0:cfecfabc5e23 | 227 | |
clemente | 0:cfecfabc5e23 | 228 | void MPL3115A2::Active( void) |
clemente | 0:cfecfabc5e23 | 229 | { |
clemente | 0:cfecfabc5e23 | 230 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 231 | |
clemente | 0:cfecfabc5e23 | 232 | // Activate the peripheral |
clemente | 0:cfecfabc5e23 | 233 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 234 | unsigned char data[2] = {REG_CTRL_REG_1, t|0x01}; |
clemente | 0:cfecfabc5e23 | 235 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 236 | } |
clemente | 0:cfecfabc5e23 | 237 | |
clemente | 0:cfecfabc5e23 | 238 | void MPL3115A2::Standby( void) |
clemente | 0:cfecfabc5e23 | 239 | { |
clemente | 0:cfecfabc5e23 | 240 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 241 | |
clemente | 0:cfecfabc5e23 | 242 | // Standby |
clemente | 0:cfecfabc5e23 | 243 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 244 | unsigned char data[2] = {REG_CTRL_REG_1, t&0xFE}; |
clemente | 0:cfecfabc5e23 | 245 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 246 | } |
clemente | 0:cfecfabc5e23 | 247 | |
clemente | 0:cfecfabc5e23 | 248 | unsigned char MPL3115A2::getDeviceID() { |
clemente | 0:cfecfabc5e23 | 249 | unsigned char device_id = 0; |
clemente | 0:cfecfabc5e23 | 250 | readRegs(REG_WHO_AM_I, &device_id, 1); |
clemente | 0:cfecfabc5e23 | 251 | return device_id; |
clemente | 0:cfecfabc5e23 | 252 | } |
clemente | 0:cfecfabc5e23 | 253 | |
clemente | 0:cfecfabc5e23 | 254 | unsigned int MPL3115A2::isDataAvailable( void) |
clemente | 0:cfecfabc5e23 | 255 | { |
clemente | 0:cfecfabc5e23 | 256 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 257 | |
clemente | 0:cfecfabc5e23 | 258 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 259 | |
clemente | 0:cfecfabc5e23 | 260 | if ( status & 0x08) { |
clemente | 0:cfecfabc5e23 | 261 | return 1; |
clemente | 0:cfecfabc5e23 | 262 | } else { |
clemente | 0:cfecfabc5e23 | 263 | return 0; |
clemente | 0:cfecfabc5e23 | 264 | } |
clemente | 0:cfecfabc5e23 | 265 | |
clemente | 0:cfecfabc5e23 | 266 | } |
clemente | 0:cfecfabc5e23 | 267 | |
clemente | 0:cfecfabc5e23 | 268 | unsigned char MPL3115A2::getStatus( void) |
clemente | 0:cfecfabc5e23 | 269 | { |
clemente | 0:cfecfabc5e23 | 270 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 271 | |
clemente | 0:cfecfabc5e23 | 272 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 273 | return status; |
clemente | 0:cfecfabc5e23 | 274 | } |
clemente | 0:cfecfabc5e23 | 275 | |
clemente | 0:cfecfabc5e23 | 276 | void MPL3115A2::getAllData( float *f) |
clemente | 0:cfecfabc5e23 | 277 | { |
clemente | 0:cfecfabc5e23 | 278 | if ( MPL3115A2_mode == ALTIMETER_MODE) { |
clemente | 0:cfecfabc5e23 | 279 | f[0] = getAltimeter(); |
clemente | 0:cfecfabc5e23 | 280 | } else { |
clemente | 0:cfecfabc5e23 | 281 | f[0] = getPressure(); |
clemente | 0:cfecfabc5e23 | 282 | } |
clemente | 0:cfecfabc5e23 | 283 | |
clemente | 0:cfecfabc5e23 | 284 | f[1] = getTemperature(); |
clemente | 0:cfecfabc5e23 | 285 | } |
clemente | 0:cfecfabc5e23 | 286 | |
clemente | 0:cfecfabc5e23 | 287 | float MPL3115A2::getAltimeter( void) |
clemente | 0:cfecfabc5e23 | 288 | { |
clemente | 0:cfecfabc5e23 | 289 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 290 | unsigned short altm; |
clemente | 0:cfecfabc5e23 | 291 | float faltm; |
clemente | 0:cfecfabc5e23 | 292 | |
clemente | 0:cfecfabc5e23 | 293 | /* |
clemente | 0:cfecfabc5e23 | 294 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 295 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 296 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 297 | */ |
clemente | 0:cfecfabc5e23 | 298 | readRegs( REG_ALTIMETER_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 299 | altm = (dt[0]<<8) | dt[1]; |
clemente | 0:cfecfabc5e23 | 300 | // |
clemente | 0:cfecfabc5e23 | 301 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 302 | altm = ~altm + 1; |
clemente | 0:cfecfabc5e23 | 303 | faltm = (float)altm * -1.0f; |
clemente | 0:cfecfabc5e23 | 304 | } else { |
clemente | 0:cfecfabc5e23 | 305 | faltm = (float)altm * 1.0f; |
clemente | 0:cfecfabc5e23 | 306 | } |
clemente | 0:cfecfabc5e23 | 307 | // |
clemente | 0:cfecfabc5e23 | 308 | faltm = faltm+((float)(dt[2]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 309 | return faltm; |
clemente | 0:cfecfabc5e23 | 310 | } |
clemente | 0:cfecfabc5e23 | 311 | |
clemente | 0:cfecfabc5e23 | 312 | float MPL3115A2::getPressure( void) |
clemente | 0:cfecfabc5e23 | 313 | { |
clemente | 0:cfecfabc5e23 | 314 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 315 | unsigned int prs; |
clemente | 0:cfecfabc5e23 | 316 | float fprs; |
clemente | 0:cfecfabc5e23 | 317 | |
clemente | 0:cfecfabc5e23 | 318 | /* |
clemente | 0:cfecfabc5e23 | 319 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 320 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 321 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 322 | */ |
clemente | 0:cfecfabc5e23 | 323 | readRegs( REG_PRESSURE_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 324 | prs = (dt[0]<<10) | (dt[1]<<2) | (dt[2]>>6); |
clemente | 0:cfecfabc5e23 | 325 | // |
clemente | 0:cfecfabc5e23 | 326 | fprs = (float)prs * 1.0f; |
clemente | 0:cfecfabc5e23 | 327 | |
clemente | 0:cfecfabc5e23 | 328 | if ( dt[2] & 0x20) |
clemente | 0:cfecfabc5e23 | 329 | fprs += 0.25f; |
clemente | 0:cfecfabc5e23 | 330 | if ( dt[2] & 0x10) |
clemente | 0:cfecfabc5e23 | 331 | fprs += 0.5f; |
clemente | 0:cfecfabc5e23 | 332 | |
clemente | 0:cfecfabc5e23 | 333 | return fprs; |
clemente | 0:cfecfabc5e23 | 334 | } |
clemente | 0:cfecfabc5e23 | 335 | |
clemente | 0:cfecfabc5e23 | 336 | |
clemente | 0:cfecfabc5e23 | 337 | float MPL3115A2::getTemperature( void) |
clemente | 0:cfecfabc5e23 | 338 | { |
clemente | 0:cfecfabc5e23 | 339 | unsigned char dt[2]; |
clemente | 0:cfecfabc5e23 | 340 | unsigned short temp; |
clemente | 0:cfecfabc5e23 | 341 | float ftemp; |
clemente | 0:cfecfabc5e23 | 342 | |
clemente | 0:cfecfabc5e23 | 343 | /* |
clemente | 0:cfecfabc5e23 | 344 | * dt[0] = Bits 4-11 of 16-bit real-time temperature sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 345 | * dt[1] = Bits 0-3 of 16-bit real-time temperature sample. (b7-b4) |
clemente | 0:cfecfabc5e23 | 346 | */ |
clemente | 0:cfecfabc5e23 | 347 | readRegs( REG_TEMP_MSB, &dt[0], 2); |
clemente | 0:cfecfabc5e23 | 348 | temp = dt[0]; |
clemente | 0:cfecfabc5e23 | 349 | // |
clemente | 0:cfecfabc5e23 | 350 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 351 | temp = ~temp + 1; |
clemente | 0:cfecfabc5e23 | 352 | ftemp = (float)temp * -1.0f; |
clemente | 0:cfecfabc5e23 | 353 | } else { |
clemente | 0:cfecfabc5e23 | 354 | ftemp = (float)temp * 1.0f; |
clemente | 0:cfecfabc5e23 | 355 | } |
clemente | 0:cfecfabc5e23 | 356 | // |
clemente | 0:cfecfabc5e23 | 357 | ftemp = ftemp+((float)(dt[1]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 358 | return ftemp; |
clemente | 0:cfecfabc5e23 | 359 | |
clemente | 0:cfecfabc5e23 | 360 | } |
clemente | 0:cfecfabc5e23 | 361 | |
clemente | 0:cfecfabc5e23 | 362 | void MPL3115A2::readRegs(int addr, uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 363 | char t[1] = {addr}; |
clemente | 0:cfecfabc5e23 | 364 | m_i2c.write(m_addr, t, 1, true); |
clemente | 0:cfecfabc5e23 | 365 | m_i2c.read(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 366 | } |
clemente | 0:cfecfabc5e23 | 367 | |
clemente | 0:cfecfabc5e23 | 368 | void MPL3115A2::writeRegs(uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 369 | m_i2c.write(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 370 | } |