Llibrary for the WiGo MPL3115A2, I2C Precision Altimeter sensor.
Fork of MPL3115A2 by
MPL3115A2.cpp@6:03c24251e500, 2013-08-22 (annotated)
- Committer:
- clemente
- Date:
- Thu Aug 22 14:52:16 2013 +0000
- Revision:
- 6:03c24251e500
- Parent:
- 5:9edec5ee8bf4
- Child:
- 7:59e9ba115d0a
Added check for data available.
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 | 6:03c24251e500 | 18 | // Status flag for data ready. |
clemente | 6:03c24251e500 | 19 | #define PTDR_STATUS 0x03 // Pressure Altitude and Temperature ready |
clemente | 6:03c24251e500 | 20 | #define PDR_STATUS 0x02 // Pressure and Altitude data ready |
clemente | 6:03c24251e500 | 21 | #define TDR_STATUS 0x01 // Temperature data ready |
clemente | 6:03c24251e500 | 22 | |
clemente | 3:a2f1752add9a | 23 | /** Interrupt schema |
clemente | 3:a2f1752add9a | 24 | * |
clemente | 3:a2f1752add9a | 25 | * :: The Altitude Trigger use the IRQ1. |
clemente | 3:a2f1752add9a | 26 | * |
clemente | 3:a2f1752add9a | 27 | * Altitude Trigger -- MPL3115A2_Int1.fall --- AltitudeTrg_IRQ --- user1_fptr |
clemente | 3:a2f1752add9a | 28 | * |
clemente | 3:a2f1752add9a | 29 | * |
clemente | 3:a2f1752add9a | 30 | * :: The Data ready use the IRQ2. |
clemente | 3:a2f1752add9a | 31 | * |
clemente | 3:a2f1752add9a | 32 | * Data Ready -- MPL3115A2_Int2.fall --- DataReady_IRQ --- user2_fptr |
clemente | 3:a2f1752add9a | 33 | * |
clemente | 3:a2f1752add9a | 34 | */ |
clemente | 2:a2fcfb7ff611 | 35 | void (*user2_fptr)(void); // Pointers to user function called after |
clemente | 2:a2fcfb7ff611 | 36 | void (*user1_fptr)(void); // IRQ assertion. |
clemente | 2:a2fcfb7ff611 | 37 | |
clemente | 2:a2fcfb7ff611 | 38 | // |
clemente | 2:a2fcfb7ff611 | 39 | InterruptIn MPL3115A2_Int1( PTD4); // INT1 |
clemente | 2:a2fcfb7ff611 | 40 | InterruptIn MPL3115A2_Int2( PTA12); // INT2 |
clemente | 2:a2fcfb7ff611 | 41 | |
clemente | 0:cfecfabc5e23 | 42 | MPL3115A2::MPL3115A2(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { |
clemente | 0:cfecfabc5e23 | 43 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 44 | MPL3115A2_oversampling = OVERSAMPLE_RATIO_1; |
clemente | 4:fdf14a259af8 | 45 | // |
clemente | 4:fdf14a259af8 | 46 | user1_fptr = NULL; |
clemente | 4:fdf14a259af8 | 47 | user2_fptr = NULL; |
clemente | 4:fdf14a259af8 | 48 | MPL3115A2_Int1.fall( NULL); |
clemente | 4:fdf14a259af8 | 49 | MPL3115A2_Int2.fall( NULL); |
clemente | 0:cfecfabc5e23 | 50 | } |
clemente | 0:cfecfabc5e23 | 51 | |
clemente | 2:a2fcfb7ff611 | 52 | void MPL3115A2::Reset( void) |
clemente | 2:a2fcfb7ff611 | 53 | { |
clemente | 2:a2fcfb7ff611 | 54 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 55 | |
clemente | 2:a2fcfb7ff611 | 56 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 57 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 2:a2fcfb7ff611 | 58 | unsigned char data[2] = { REG_CTRL_REG_1, t|0x04}; |
clemente | 2:a2fcfb7ff611 | 59 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 60 | wait( 0.1); |
clemente | 2:a2fcfb7ff611 | 61 | |
clemente | 2:a2fcfb7ff611 | 62 | } |
clemente | 2:a2fcfb7ff611 | 63 | |
clemente | 2:a2fcfb7ff611 | 64 | void MPL3115A2::DataReady( void(*fptr)(void), unsigned char OS) |
clemente | 2:a2fcfb7ff611 | 65 | { |
clemente | 2:a2fcfb7ff611 | 66 | unsigned char dt[5]; |
clemente | 2:a2fcfb7ff611 | 67 | unsigned char data[2]; |
clemente | 2:a2fcfb7ff611 | 68 | |
clemente | 4:fdf14a259af8 | 69 | // Soft Reset |
clemente | 2:a2fcfb7ff611 | 70 | Reset(); |
clemente | 2:a2fcfb7ff611 | 71 | |
clemente | 2:a2fcfb7ff611 | 72 | Standby(); |
clemente | 2:a2fcfb7ff611 | 73 | |
clemente | 4:fdf14a259af8 | 74 | // Clear all interrupts by reading the output registers. |
clemente | 2:a2fcfb7ff611 | 75 | readRegs( REG_ALTIMETER_MSB, &dt[0], 5); |
clemente | 2:a2fcfb7ff611 | 76 | getStatus(); |
clemente | 4:fdf14a259af8 | 77 | // Configure INT active low and pullup |
clemente | 4:fdf14a259af8 | 78 | data[0] = REG_CTRL_REG_3; |
clemente | 4:fdf14a259af8 | 79 | data[1] = 0x00; |
clemente | 4:fdf14a259af8 | 80 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 81 | // Enable Interrupt fot data ready |
clemente | 2:a2fcfb7ff611 | 82 | data[0] = REG_CTRL_REG_4; |
clemente | 2:a2fcfb7ff611 | 83 | data[1] = 0x80; |
clemente | 2:a2fcfb7ff611 | 84 | writeRegs(data, 2); |
clemente | 3:a2f1752add9a | 85 | // Configure Interrupt to route to INT2 |
clemente | 2:a2fcfb7ff611 | 86 | data[0] = REG_CTRL_REG_5; |
clemente | 2:a2fcfb7ff611 | 87 | data[1] = 0x00; |
clemente | 2:a2fcfb7ff611 | 88 | writeRegs(data, 2); |
clemente | 4:fdf14a259af8 | 89 | data[0] = REG_PT_DATA_CFG; |
clemente | 4:fdf14a259af8 | 90 | data[1] = 0x07; |
clemente | 4:fdf14a259af8 | 91 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 92 | |
clemente | 4:fdf14a259af8 | 93 | // Configure the OverSampling rate, Altimeter/Barometer mode and set the sensor Active |
clemente | 2:a2fcfb7ff611 | 94 | data[0] = REG_CTRL_REG_1; |
clemente | 4:fdf14a259af8 | 95 | data[1] = (OS<<3); |
clemente | 4:fdf14a259af8 | 96 | // |
clemente | 4:fdf14a259af8 | 97 | if (MPL3115A2_mode == BAROMETRIC_MODE) |
clemente | 4:fdf14a259af8 | 98 | data[1] &= 0x7F; |
clemente | 4:fdf14a259af8 | 99 | else |
clemente | 4:fdf14a259af8 | 100 | data[1] |= 0x80; |
clemente | 4:fdf14a259af8 | 101 | // |
clemente | 4:fdf14a259af8 | 102 | data[1] |= 0x01; |
clemente | 2:a2fcfb7ff611 | 103 | writeRegs(data, 2); |
clemente | 2:a2fcfb7ff611 | 104 | |
clemente | 2:a2fcfb7ff611 | 105 | user2_fptr = fptr; |
clemente | 2:a2fcfb7ff611 | 106 | MPL3115A2_Int2.fall( this, &MPL3115A2::DataReady_IRQ); |
clemente | 2:a2fcfb7ff611 | 107 | |
clemente | 2:a2fcfb7ff611 | 108 | } |
clemente | 2:a2fcfb7ff611 | 109 | |
clemente | 2:a2fcfb7ff611 | 110 | void MPL3115A2::DataReady_IRQ( void) |
clemente | 2:a2fcfb7ff611 | 111 | { |
clemente | 2:a2fcfb7ff611 | 112 | // Clear the IRQ flag |
clemente | 2:a2fcfb7ff611 | 113 | getStatus(); |
clemente | 2:a2fcfb7ff611 | 114 | // Run the user supplied function |
clemente | 2:a2fcfb7ff611 | 115 | user2_fptr(); |
clemente | 2:a2fcfb7ff611 | 116 | } |
clemente | 2:a2fcfb7ff611 | 117 | |
clemente | 3:a2f1752add9a | 118 | void MPL3115A2::AltitudeTrigger( void(*fptr)(void), unsigned short level) |
clemente | 3:a2f1752add9a | 119 | { |
clemente | 3:a2f1752add9a | 120 | unsigned char dt[5]; |
clemente | 3:a2f1752add9a | 121 | unsigned char data[2]; |
clemente | 3:a2f1752add9a | 122 | |
clemente | 3:a2f1752add9a | 123 | // Soft Reset |
clemente | 3:a2f1752add9a | 124 | Reset(); |
clemente | 3:a2f1752add9a | 125 | |
clemente | 3:a2f1752add9a | 126 | // The device is on standby |
clemente | 3:a2f1752add9a | 127 | Standby(); |
clemente | 3:a2f1752add9a | 128 | |
clemente | 3:a2f1752add9a | 129 | // Clear all interrupts by reading the output registers. |
clemente | 3:a2f1752add9a | 130 | readRegs( REG_ALTIMETER_MSB, &dt[0], 5); |
clemente | 3:a2f1752add9a | 131 | getStatus(); |
clemente | 3:a2f1752add9a | 132 | |
clemente | 3:a2f1752add9a | 133 | // Write Target and Window Values |
clemente | 4:fdf14a259af8 | 134 | dt[0] = REG_P_TGT_MSB; |
clemente | 4:fdf14a259af8 | 135 | dt[1] = (level>>8); |
clemente | 4:fdf14a259af8 | 136 | dt[2] = (level&0xFF); |
clemente | 4:fdf14a259af8 | 137 | writeRegs( dt, 3); |
clemente | 3:a2f1752add9a | 138 | |
clemente | 3:a2f1752add9a | 139 | // Window values are zero |
clemente | 4:fdf14a259af8 | 140 | dt[0] = REG_P_WND_MSB; |
clemente | 4:fdf14a259af8 | 141 | dt[1] = 0; |
clemente | 4:fdf14a259af8 | 142 | dt[2] = 0; |
clemente | 4:fdf14a259af8 | 143 | writeRegs( dt, 3); |
clemente | 3:a2f1752add9a | 144 | |
clemente | 3:a2f1752add9a | 145 | // Enable Pressure Threshold interrupt |
clemente | 3:a2f1752add9a | 146 | data[0] = REG_CTRL_REG_4; |
clemente | 3:a2f1752add9a | 147 | data[1] = 0x08; |
clemente | 3:a2f1752add9a | 148 | writeRegs( data, 2); |
clemente | 3:a2f1752add9a | 149 | // Interrupt is routed to INT1 |
clemente | 3:a2f1752add9a | 150 | data[0] = REG_CTRL_REG_5; |
clemente | 3:a2f1752add9a | 151 | data[1] = 0x08; |
clemente | 3:a2f1752add9a | 152 | writeRegs( data, 2); |
clemente | 4:fdf14a259af8 | 153 | data[0] = REG_PT_DATA_CFG; |
clemente | 4:fdf14a259af8 | 154 | data[1] = 0x07; |
clemente | 4:fdf14a259af8 | 155 | writeRegs(data, 2); |
clemente | 4:fdf14a259af8 | 156 | // Configure the OverSampling rate, Altimeter mode and set the sensor Active |
clemente | 4:fdf14a259af8 | 157 | data[0] = REG_CTRL_REG_1; |
clemente | 4:fdf14a259af8 | 158 | data[1] = 0x81 | (MPL3115A2_oversampling<<3); |
clemente | 4:fdf14a259af8 | 159 | writeRegs(data, 2); |
clemente | 3:a2f1752add9a | 160 | |
clemente | 3:a2f1752add9a | 161 | user1_fptr = fptr; |
clemente | 3:a2f1752add9a | 162 | MPL3115A2_Int1.fall( this, &MPL3115A2::AltitudeTrg_IRQ); |
clemente | 3:a2f1752add9a | 163 | |
clemente | 3:a2f1752add9a | 164 | } |
clemente | 3:a2f1752add9a | 165 | |
clemente | 3:a2f1752add9a | 166 | void MPL3115A2::AltitudeTrg_IRQ( void) |
clemente | 3:a2f1752add9a | 167 | { |
clemente | 3:a2f1752add9a | 168 | // Clear the IRQ flag |
clemente | 3:a2f1752add9a | 169 | getStatus(); |
clemente | 3:a2f1752add9a | 170 | // Run the user supplied function |
clemente | 3:a2f1752add9a | 171 | user1_fptr(); |
clemente | 3:a2f1752add9a | 172 | |
clemente | 3:a2f1752add9a | 173 | } |
clemente | 3:a2f1752add9a | 174 | |
clemente | 0:cfecfabc5e23 | 175 | void MPL3115A2::Barometric_Mode( void) |
clemente | 0:cfecfabc5e23 | 176 | { |
clemente | 0:cfecfabc5e23 | 177 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 178 | unsigned char data[2]; |
clemente | 0:cfecfabc5e23 | 179 | |
clemente | 0:cfecfabc5e23 | 180 | Standby(); |
clemente | 0:cfecfabc5e23 | 181 | |
clemente | 0:cfecfabc5e23 | 182 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 183 | Reset(); |
clemente | 2:a2fcfb7ff611 | 184 | |
clemente | 0:cfecfabc5e23 | 185 | Standby(); |
clemente | 0:cfecfabc5e23 | 186 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 187 | |
clemente | 2:a2fcfb7ff611 | 188 | // Set the Barometric mode |
clemente | 0:cfecfabc5e23 | 189 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 190 | data[1] = t&0x7F; |
clemente | 0:cfecfabc5e23 | 191 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 192 | |
clemente | 0:cfecfabc5e23 | 193 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 194 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 195 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 196 | |
clemente | 0:cfecfabc5e23 | 197 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 198 | |
clemente | 0:cfecfabc5e23 | 199 | Active(); |
clemente | 0:cfecfabc5e23 | 200 | |
clemente | 0:cfecfabc5e23 | 201 | MPL3115A2_mode = BAROMETRIC_MODE; |
clemente | 0:cfecfabc5e23 | 202 | } |
clemente | 0:cfecfabc5e23 | 203 | |
clemente | 0:cfecfabc5e23 | 204 | void MPL3115A2::Altimeter_Mode( void) |
clemente | 0:cfecfabc5e23 | 205 | { |
clemente | 0:cfecfabc5e23 | 206 | unsigned char t; |
clemente | 2:a2fcfb7ff611 | 207 | unsigned char data[2]; |
clemente | 2:a2fcfb7ff611 | 208 | |
clemente | 0:cfecfabc5e23 | 209 | Standby(); |
clemente | 0:cfecfabc5e23 | 210 | |
clemente | 0:cfecfabc5e23 | 211 | // soft reset... |
clemente | 2:a2fcfb7ff611 | 212 | Reset(); |
clemente | 0:cfecfabc5e23 | 213 | |
clemente | 0:cfecfabc5e23 | 214 | Standby(); |
clemente | 0:cfecfabc5e23 | 215 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 216 | |
clemente | 0:cfecfabc5e23 | 217 | data[0] = REG_CTRL_REG_1; |
clemente | 0:cfecfabc5e23 | 218 | data[1] = t|0x80; |
clemente | 0:cfecfabc5e23 | 219 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 220 | |
clemente | 0:cfecfabc5e23 | 221 | data[0] = REG_PT_DATA_CFG; |
clemente | 0:cfecfabc5e23 | 222 | data[1] = 0x07; |
clemente | 0:cfecfabc5e23 | 223 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 224 | |
clemente | 0:cfecfabc5e23 | 225 | Oversample_Ratio( MPL3115A2_oversampling); |
clemente | 0:cfecfabc5e23 | 226 | |
clemente | 0:cfecfabc5e23 | 227 | Active(); |
clemente | 0:cfecfabc5e23 | 228 | |
clemente | 0:cfecfabc5e23 | 229 | MPL3115A2_mode = ALTIMETER_MODE; |
clemente | 0:cfecfabc5e23 | 230 | } |
clemente | 0:cfecfabc5e23 | 231 | |
clemente | 0:cfecfabc5e23 | 232 | void MPL3115A2::Oversample_Ratio( unsigned int ratio) |
clemente | 0:cfecfabc5e23 | 233 | { |
clemente | 0:cfecfabc5e23 | 234 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 235 | |
clemente | 0:cfecfabc5e23 | 236 | Standby(); |
clemente | 0:cfecfabc5e23 | 237 | readRegs( REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 238 | |
clemente | 0:cfecfabc5e23 | 239 | t = t & 0xE7; |
clemente | 0:cfecfabc5e23 | 240 | t = t | ( ratio<<3); |
clemente | 0:cfecfabc5e23 | 241 | |
clemente | 0:cfecfabc5e23 | 242 | unsigned char data[2] = { REG_CTRL_REG_1, t}; |
clemente | 0:cfecfabc5e23 | 243 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 244 | |
clemente | 0:cfecfabc5e23 | 245 | Active(); |
clemente | 0:cfecfabc5e23 | 246 | |
clemente | 0:cfecfabc5e23 | 247 | MPL3115A2_oversampling = ratio; |
clemente | 0:cfecfabc5e23 | 248 | } |
clemente | 0:cfecfabc5e23 | 249 | |
clemente | 0:cfecfabc5e23 | 250 | |
clemente | 0:cfecfabc5e23 | 251 | void MPL3115A2::Active( void) |
clemente | 0:cfecfabc5e23 | 252 | { |
clemente | 0:cfecfabc5e23 | 253 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 254 | |
clemente | 0:cfecfabc5e23 | 255 | // Activate the peripheral |
clemente | 0:cfecfabc5e23 | 256 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 257 | unsigned char data[2] = {REG_CTRL_REG_1, t|0x01}; |
clemente | 0:cfecfabc5e23 | 258 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 259 | } |
clemente | 0:cfecfabc5e23 | 260 | |
clemente | 0:cfecfabc5e23 | 261 | void MPL3115A2::Standby( void) |
clemente | 0:cfecfabc5e23 | 262 | { |
clemente | 0:cfecfabc5e23 | 263 | unsigned char t; |
clemente | 0:cfecfabc5e23 | 264 | |
clemente | 0:cfecfabc5e23 | 265 | // Standby |
clemente | 0:cfecfabc5e23 | 266 | readRegs(REG_CTRL_REG_1, &t, 1); |
clemente | 0:cfecfabc5e23 | 267 | unsigned char data[2] = {REG_CTRL_REG_1, t&0xFE}; |
clemente | 0:cfecfabc5e23 | 268 | writeRegs(data, 2); |
clemente | 0:cfecfabc5e23 | 269 | } |
clemente | 0:cfecfabc5e23 | 270 | |
clemente | 0:cfecfabc5e23 | 271 | unsigned char MPL3115A2::getDeviceID() { |
clemente | 0:cfecfabc5e23 | 272 | unsigned char device_id = 0; |
clemente | 0:cfecfabc5e23 | 273 | readRegs(REG_WHO_AM_I, &device_id, 1); |
clemente | 0:cfecfabc5e23 | 274 | return device_id; |
clemente | 0:cfecfabc5e23 | 275 | } |
clemente | 0:cfecfabc5e23 | 276 | |
clemente | 0:cfecfabc5e23 | 277 | unsigned int MPL3115A2::isDataAvailable( void) |
clemente | 0:cfecfabc5e23 | 278 | { |
clemente | 0:cfecfabc5e23 | 279 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 280 | |
clemente | 0:cfecfabc5e23 | 281 | readRegs( REG_STATUS, &status, 1); |
clemente | 6:03c24251e500 | 282 | |
clemente | 6:03c24251e500 | 283 | return ((status>>1)); |
clemente | 0:cfecfabc5e23 | 284 | |
clemente | 0:cfecfabc5e23 | 285 | } |
clemente | 0:cfecfabc5e23 | 286 | |
clemente | 0:cfecfabc5e23 | 287 | unsigned char MPL3115A2::getStatus( void) |
clemente | 0:cfecfabc5e23 | 288 | { |
clemente | 0:cfecfabc5e23 | 289 | unsigned char status; |
clemente | 0:cfecfabc5e23 | 290 | |
clemente | 0:cfecfabc5e23 | 291 | readRegs( REG_STATUS, &status, 1); |
clemente | 0:cfecfabc5e23 | 292 | return status; |
clemente | 0:cfecfabc5e23 | 293 | } |
clemente | 0:cfecfabc5e23 | 294 | |
clemente | 6:03c24251e500 | 295 | unsigned int MPL3115A2::getAllData( float *f) |
clemente | 0:cfecfabc5e23 | 296 | { |
clemente | 6:03c24251e500 | 297 | if ( isDataAvailable() & PTDR_STATUS) { |
clemente | 6:03c24251e500 | 298 | if ( MPL3115A2_mode == ALTIMETER_MODE) { |
clemente | 6:03c24251e500 | 299 | f[0] = getAltimeter(); |
clemente | 6:03c24251e500 | 300 | } else { |
clemente | 6:03c24251e500 | 301 | f[0] = getPressure(); |
clemente | 6:03c24251e500 | 302 | } |
clemente | 6:03c24251e500 | 303 | |
clemente | 6:03c24251e500 | 304 | f[1] = getTemperature(); |
clemente | 6:03c24251e500 | 305 | // |
clemente | 6:03c24251e500 | 306 | return 1; |
clemente | 6:03c24251e500 | 307 | } else |
clemente | 6:03c24251e500 | 308 | return 0; |
clemente | 0:cfecfabc5e23 | 309 | } |
clemente | 0:cfecfabc5e23 | 310 | |
clemente | 0:cfecfabc5e23 | 311 | float MPL3115A2::getAltimeter( void) |
clemente | 0:cfecfabc5e23 | 312 | { |
clemente | 0:cfecfabc5e23 | 313 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 314 | unsigned short altm; |
clemente | 0:cfecfabc5e23 | 315 | float faltm; |
clemente | 0:cfecfabc5e23 | 316 | |
clemente | 0:cfecfabc5e23 | 317 | /* |
clemente | 5:9edec5ee8bf4 | 318 | * dt[0] = Bits 12-19 of 20-bit real-time Altitude sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 319 | * dt[1] = Bits 4-11 of 20-bit real-time Altitude sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 320 | * dt[2] = Bits 0-3 of 20-bit real-time Altitude sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 321 | */ |
clemente | 0:cfecfabc5e23 | 322 | readRegs( REG_ALTIMETER_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 323 | altm = (dt[0]<<8) | dt[1]; |
clemente | 0:cfecfabc5e23 | 324 | // |
clemente | 0:cfecfabc5e23 | 325 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 326 | altm = ~altm + 1; |
clemente | 0:cfecfabc5e23 | 327 | faltm = (float)altm * -1.0f; |
clemente | 0:cfecfabc5e23 | 328 | } else { |
clemente | 0:cfecfabc5e23 | 329 | faltm = (float)altm * 1.0f; |
clemente | 0:cfecfabc5e23 | 330 | } |
clemente | 0:cfecfabc5e23 | 331 | // |
clemente | 0:cfecfabc5e23 | 332 | faltm = faltm+((float)(dt[2]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 333 | return faltm; |
clemente | 0:cfecfabc5e23 | 334 | } |
clemente | 0:cfecfabc5e23 | 335 | |
clemente | 0:cfecfabc5e23 | 336 | float MPL3115A2::getPressure( void) |
clemente | 0:cfecfabc5e23 | 337 | { |
clemente | 0:cfecfabc5e23 | 338 | unsigned char dt[3]; |
clemente | 0:cfecfabc5e23 | 339 | unsigned int prs; |
clemente | 0:cfecfabc5e23 | 340 | float fprs; |
clemente | 0:cfecfabc5e23 | 341 | |
clemente | 0:cfecfabc5e23 | 342 | /* |
clemente | 0:cfecfabc5e23 | 343 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 344 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 345 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 0:cfecfabc5e23 | 346 | */ |
clemente | 0:cfecfabc5e23 | 347 | readRegs( REG_PRESSURE_MSB, &dt[0], 3); |
clemente | 0:cfecfabc5e23 | 348 | prs = (dt[0]<<10) | (dt[1]<<2) | (dt[2]>>6); |
clemente | 0:cfecfabc5e23 | 349 | // |
clemente | 0:cfecfabc5e23 | 350 | fprs = (float)prs * 1.0f; |
clemente | 0:cfecfabc5e23 | 351 | |
clemente | 0:cfecfabc5e23 | 352 | if ( dt[2] & 0x20) |
clemente | 0:cfecfabc5e23 | 353 | fprs += 0.25f; |
clemente | 0:cfecfabc5e23 | 354 | if ( dt[2] & 0x10) |
clemente | 0:cfecfabc5e23 | 355 | fprs += 0.5f; |
clemente | 0:cfecfabc5e23 | 356 | |
clemente | 0:cfecfabc5e23 | 357 | return fprs; |
clemente | 0:cfecfabc5e23 | 358 | } |
clemente | 0:cfecfabc5e23 | 359 | |
clemente | 0:cfecfabc5e23 | 360 | |
clemente | 0:cfecfabc5e23 | 361 | float MPL3115A2::getTemperature( void) |
clemente | 0:cfecfabc5e23 | 362 | { |
clemente | 0:cfecfabc5e23 | 363 | unsigned char dt[2]; |
clemente | 0:cfecfabc5e23 | 364 | unsigned short temp; |
clemente | 0:cfecfabc5e23 | 365 | float ftemp; |
clemente | 0:cfecfabc5e23 | 366 | |
clemente | 0:cfecfabc5e23 | 367 | /* |
clemente | 0:cfecfabc5e23 | 368 | * dt[0] = Bits 4-11 of 16-bit real-time temperature sample. (b7-b0) |
clemente | 0:cfecfabc5e23 | 369 | * dt[1] = Bits 0-3 of 16-bit real-time temperature sample. (b7-b4) |
clemente | 0:cfecfabc5e23 | 370 | */ |
clemente | 0:cfecfabc5e23 | 371 | readRegs( REG_TEMP_MSB, &dt[0], 2); |
clemente | 0:cfecfabc5e23 | 372 | temp = dt[0]; |
clemente | 0:cfecfabc5e23 | 373 | // |
clemente | 0:cfecfabc5e23 | 374 | if ( dt[0] > 0x7F) { |
clemente | 0:cfecfabc5e23 | 375 | temp = ~temp + 1; |
clemente | 0:cfecfabc5e23 | 376 | ftemp = (float)temp * -1.0f; |
clemente | 0:cfecfabc5e23 | 377 | } else { |
clemente | 0:cfecfabc5e23 | 378 | ftemp = (float)temp * 1.0f; |
clemente | 0:cfecfabc5e23 | 379 | } |
clemente | 0:cfecfabc5e23 | 380 | // |
clemente | 0:cfecfabc5e23 | 381 | ftemp = ftemp+((float)(dt[1]>>4) * 0.0625f); |
clemente | 0:cfecfabc5e23 | 382 | return ftemp; |
clemente | 0:cfecfabc5e23 | 383 | |
clemente | 0:cfecfabc5e23 | 384 | } |
clemente | 0:cfecfabc5e23 | 385 | |
clemente | 5:9edec5ee8bf4 | 386 | unsigned int MPL3115A2::getAllDataRaw( unsigned char *dt) |
clemente | 5:9edec5ee8bf4 | 387 | { |
clemente | 6:03c24251e500 | 388 | // Check for Press/Alti and Temp value ready |
clemente | 6:03c24251e500 | 389 | if ( isDataAvailable() & PTDR_STATUS) { |
clemente | 6:03c24251e500 | 390 | if ( MPL3115A2_mode == ALTIMETER_MODE) { |
clemente | 6:03c24251e500 | 391 | getAltimeterRaw( &dt[0]); // 3 bytes |
clemente | 6:03c24251e500 | 392 | } else { |
clemente | 6:03c24251e500 | 393 | getPressureRaw( &dt[0]); // 3 bytes |
clemente | 6:03c24251e500 | 394 | } |
clemente | 6:03c24251e500 | 395 | |
clemente | 6:03c24251e500 | 396 | getTemperatureRaw( &dt[3]); // 2 bytes |
clemente | 6:03c24251e500 | 397 | |
clemente | 6:03c24251e500 | 398 | return 1; |
clemente | 5:9edec5ee8bf4 | 399 | } else { |
clemente | 6:03c24251e500 | 400 | return 0; |
clemente | 5:9edec5ee8bf4 | 401 | } |
clemente | 5:9edec5ee8bf4 | 402 | } |
clemente | 5:9edec5ee8bf4 | 403 | |
clemente | 5:9edec5ee8bf4 | 404 | unsigned int MPL3115A2::getAltimeterRaw( unsigned char *dt) |
clemente | 5:9edec5ee8bf4 | 405 | { |
clemente | 5:9edec5ee8bf4 | 406 | |
clemente | 5:9edec5ee8bf4 | 407 | /* |
clemente | 5:9edec5ee8bf4 | 408 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 409 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 410 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 5:9edec5ee8bf4 | 411 | */ |
clemente | 6:03c24251e500 | 412 | |
clemente | 6:03c24251e500 | 413 | // Check for Press/Alti value ready |
clemente | 6:03c24251e500 | 414 | if ( isDataAvailable() & PDR_STATUS) { |
clemente | 6:03c24251e500 | 415 | readRegs( REG_ALTIMETER_MSB, &dt[0], 3); |
clemente | 6:03c24251e500 | 416 | return 1; |
clemente | 6:03c24251e500 | 417 | } else |
clemente | 6:03c24251e500 | 418 | return 0; |
clemente | 5:9edec5ee8bf4 | 419 | } |
clemente | 5:9edec5ee8bf4 | 420 | |
clemente | 5:9edec5ee8bf4 | 421 | unsigned int MPL3115A2::getPressureRaw( unsigned char *dt) |
clemente | 5:9edec5ee8bf4 | 422 | { |
clemente | 5:9edec5ee8bf4 | 423 | |
clemente | 5:9edec5ee8bf4 | 424 | /* |
clemente | 5:9edec5ee8bf4 | 425 | * dt[0] = Bits 12-19 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 426 | * dt[1] = Bits 4-11 of 20-bit real-time Pressure sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 427 | * dt[2] = Bits 0-3 of 20-bit real-time Pressure sample (b7-b4) |
clemente | 5:9edec5ee8bf4 | 428 | */ |
clemente | 6:03c24251e500 | 429 | |
clemente | 6:03c24251e500 | 430 | // Check for Press/Alti value ready |
clemente | 6:03c24251e500 | 431 | if ( isDataAvailable() & PDR_STATUS) { |
clemente | 6:03c24251e500 | 432 | readRegs( REG_PRESSURE_MSB, &dt[0], 3); |
clemente | 6:03c24251e500 | 433 | return 1; |
clemente | 6:03c24251e500 | 434 | } else |
clemente | 6:03c24251e500 | 435 | return 0; |
clemente | 6:03c24251e500 | 436 | |
clemente | 5:9edec5ee8bf4 | 437 | } |
clemente | 5:9edec5ee8bf4 | 438 | |
clemente | 5:9edec5ee8bf4 | 439 | unsigned int MPL3115A2::getTemperatureRaw( unsigned char *dt) |
clemente | 5:9edec5ee8bf4 | 440 | { |
clemente | 5:9edec5ee8bf4 | 441 | |
clemente | 5:9edec5ee8bf4 | 442 | /* |
clemente | 5:9edec5ee8bf4 | 443 | * dt[0] = Bits 4-11 of 16-bit real-time temperature sample. (b7-b0) |
clemente | 5:9edec5ee8bf4 | 444 | * dt[1] = Bits 0-3 of 16-bit real-time temperature sample. (b7-b4) |
clemente | 5:9edec5ee8bf4 | 445 | */ |
clemente | 6:03c24251e500 | 446 | |
clemente | 6:03c24251e500 | 447 | // Check for Temp value ready |
clemente | 6:03c24251e500 | 448 | if ( isDataAvailable() & TDR_STATUS) { |
clemente | 6:03c24251e500 | 449 | readRegs( REG_TEMP_MSB, &dt[0], 2); |
clemente | 6:03c24251e500 | 450 | return 1; |
clemente | 6:03c24251e500 | 451 | } else |
clemente | 6:03c24251e500 | 452 | return 0; |
clemente | 5:9edec5ee8bf4 | 453 | } |
clemente | 5:9edec5ee8bf4 | 454 | |
clemente | 0:cfecfabc5e23 | 455 | void MPL3115A2::readRegs(int addr, uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 456 | char t[1] = {addr}; |
clemente | 0:cfecfabc5e23 | 457 | m_i2c.write(m_addr, t, 1, true); |
clemente | 0:cfecfabc5e23 | 458 | m_i2c.read(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 459 | } |
clemente | 0:cfecfabc5e23 | 460 | |
clemente | 0:cfecfabc5e23 | 461 | void MPL3115A2::writeRegs(uint8_t * data, int len) { |
clemente | 0:cfecfabc5e23 | 462 | m_i2c.write(m_addr, (char *)data, len); |
clemente | 0:cfecfabc5e23 | 463 | } |