MEMS pressure sensor by STMicroelectronics. FIFO Hardware digital filter as default.
Fork of LPS25H by
Diff: LPS25H.cpp
- Revision:
- 2:92691fd6cb75
- Parent:
- 1:9db35e42ddbc
diff -r 9db35e42ddbc -r 92691fd6cb75 LPS25H.cpp --- a/LPS25H.cpp Tue Aug 22 10:18:07 2017 +0000 +++ b/LPS25H.cpp Sun Oct 14 02:00:36 2018 +0000 @@ -13,14 +13,14 @@ #include "LPS25H.h" -LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr) : +LPS25H::LPS25H (PinName p_sda, PinName p_scl) : _i2c_p(new I2C(p_sda, p_scl)), _i2c(*_i2c_p) { - LPS25H_addr = addr; + LPS25H_addr = LPS25H_V_CHIP_ADDR; LPS25H_mode = FIFO_HW_FILTER; init(); } - +/* LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr, uint8_t mode) : _i2c_p(new I2C(p_sda, p_scl)), _i2c(*_i2c_p) { @@ -42,23 +42,23 @@ LPS25H_mode = mode; init(); } - +*/ /////////////// Initialize //////////////////////////////// void LPS25H::init(void) { _i2c.frequency(100000); // Check acc is available of not - dt[0] = LPS25H_WHO_AM_I; - _i2c.write(LPS25H_addr, dt, 1, true); - _i2c.read(LPS25H_addr, dt, 1, false); - if (dt[0] == I_AM_LPS25H) { - LPS25H_id = I_AM_LPS25H; - LPS25H_ready = 1; - } else { - LPS25H_id = 0; - LPS25H_ready = 0; - return; // acc chip is NOT on I2C line then terminate - } + //dt[0] = LPS25H_WHO_AM_I; + //_i2c.write(LPS25H_addr, dt, 1, true); + //_i2c.read(LPS25H_addr, dt, 1, false); + // if (dt[0] == I_AM_LPS25H) { + // LPS25H_id = I_AM_LPS25H; + // LPS25H_ready = 1; + // } else { + // LPS25H_id = 0; + // LPS25H_ready = 0; + // return; // acc chip is NOT on I2C line then terminate + // } if (LPS25H_mode == FIFO_HW_FILTER){ // Hardware digital filter // AN4450 April 2014 Rev1 P20/26, @@ -88,19 +88,21 @@ /////////////// Start conv. and gwt all data ////////////// void LPS25H::get(void) { - if (LPS25H_ready == 0) { + /* if (LPS25H_ready == 0) { press = 0; temp = 0; + alt = 0; return; - } + }*/ dt[0] = LPS25H_PRESS_POUT_XL | 0x80; _i2c.write(LPS25H_addr, dt, 1, true); _i2c.read(LPS25H_addr, dt, 3, false); press = dt[2] << 16 | dt[1] << 8 | dt[0]; - dt[0] = LPS25H_TEMP_OUT_L | 0x80; - _i2c.write(LPS25H_addr, dt, 1, true); - _i2c.read(LPS25H_addr, dt, 2, false); - temp = dt[1] << 8 | dt[0]; + // dt[0] = LPS25H_TEMP_OUT_L | 0x80; + // _i2c.write(LPS25H_addr, dt, 1, true); + // _i2c.read(LPS25H_addr, dt, 2, false); + // temp = dt[1] << 8 | dt[0]; + alt = (1-pow((press/4096)/1013.25,0.190284))*145366.45; } /////////////// Read data from sensor ///////////////////// @@ -110,19 +112,24 @@ } /////////////// Read data from sensor ///////////////////// -float LPS25H::temperature() +/*float LPS25H::temperature() { return (float)temp / 480 + 42.5; +}*/ +/////////////// Read data from sensor ///////////////////// +float LPS25H::altitude(void) { + + return alt/3.280839895; } /////////////// ID //////////////////////////////////////// -uint8_t LPS25H::read_id() +/*uint8_t LPS25H::read_id() { dt[0] = LPS25H_WHO_AM_I; _i2c.write(LPS25H_addr, dt, 1, true); _i2c.read(LPS25H_addr, dt, 1, false); return (uint8_t)dt[0]; -} +}*/ /////////////// I2C Freq. ///////////////////////////////// void LPS25H::frequency(int hz)