MEMS pressure sensor by STMicroelectronics. FIFO Hardware digital filter as default.
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Fork of LPS25H by
LPS25H.cpp@0:8fc511bd51af, 2015-02-22 (annotated)
- Committer:
- kenjiArai
- Date:
- Sun Feb 22 00:59:52 2015 +0000
- Revision:
- 0:8fc511bd51af
- Child:
- 1:54e65e221cae
MEMS pressure sensor by STMicroelectronics. FIFO Hardware digital filter as default.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kenjiArai | 0:8fc511bd51af | 1 | /* |
kenjiArai | 0:8fc511bd51af | 2 | * mbed library program |
kenjiArai | 0:8fc511bd51af | 3 | * LPS25H MEMS pressure sensor: 260-1260 hPa absolute digital output barometer |
kenjiArai | 0:8fc511bd51af | 4 | * made by STMicroelectronics |
kenjiArai | 0:8fc511bd51af | 5 | * http://www.st-japan.co.jp/web/catalog/sense_power/FM89/SC1316/PF255230?s_searchtype=partnumber |
kenjiArai | 0:8fc511bd51af | 6 | * |
kenjiArai | 0:8fc511bd51af | 7 | * Copyright (c) 2015 Kenji Arai / JH1PJL |
kenjiArai | 0:8fc511bd51af | 8 | * http://www.page.sannet.ne.jp/kenjia/index.html |
kenjiArai | 0:8fc511bd51af | 9 | * http://mbed.org/users/kenjiArai/ |
kenjiArai | 0:8fc511bd51af | 10 | * Created: Feburary 21st, 2015 |
kenjiArai | 0:8fc511bd51af | 11 | * Revised: Feburary 22nd, 2015 |
kenjiArai | 0:8fc511bd51af | 12 | * |
kenjiArai | 0:8fc511bd51af | 13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
kenjiArai | 0:8fc511bd51af | 14 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE |
kenjiArai | 0:8fc511bd51af | 15 | * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
kenjiArai | 0:8fc511bd51af | 16 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
kenjiArai | 0:8fc511bd51af | 17 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
kenjiArai | 0:8fc511bd51af | 18 | */ |
kenjiArai | 0:8fc511bd51af | 19 | |
kenjiArai | 0:8fc511bd51af | 20 | #include "LPS25H.h" |
kenjiArai | 0:8fc511bd51af | 21 | |
kenjiArai | 0:8fc511bd51af | 22 | LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr) : _i2c(p_sda, p_scl) |
kenjiArai | 0:8fc511bd51af | 23 | { |
kenjiArai | 0:8fc511bd51af | 24 | LPS25H_addr = addr; |
kenjiArai | 0:8fc511bd51af | 25 | LPS25H_mode = FIFO_HW_FILTER; |
kenjiArai | 0:8fc511bd51af | 26 | init(); |
kenjiArai | 0:8fc511bd51af | 27 | } |
kenjiArai | 0:8fc511bd51af | 28 | |
kenjiArai | 0:8fc511bd51af | 29 | LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr, uint8_t mode) : _i2c(p_sda, p_scl) |
kenjiArai | 0:8fc511bd51af | 30 | { |
kenjiArai | 0:8fc511bd51af | 31 | LPS25H_addr = addr; |
kenjiArai | 0:8fc511bd51af | 32 | LPS25H_mode = mode; |
kenjiArai | 0:8fc511bd51af | 33 | init(); |
kenjiArai | 0:8fc511bd51af | 34 | } |
kenjiArai | 0:8fc511bd51af | 35 | |
kenjiArai | 0:8fc511bd51af | 36 | LPS25H::LPS25H (I2C& p_i2c, uint8_t addr) : _i2c(p_i2c) |
kenjiArai | 0:8fc511bd51af | 37 | { |
kenjiArai | 0:8fc511bd51af | 38 | LPS25H_addr = addr; |
kenjiArai | 0:8fc511bd51af | 39 | LPS25H_mode = FIFO_HW_FILTER; |
kenjiArai | 0:8fc511bd51af | 40 | init(); |
kenjiArai | 0:8fc511bd51af | 41 | } |
kenjiArai | 0:8fc511bd51af | 42 | |
kenjiArai | 0:8fc511bd51af | 43 | LPS25H::LPS25H (I2C& p_i2c, uint8_t addr, uint8_t mode) : _i2c(p_i2c) |
kenjiArai | 0:8fc511bd51af | 44 | { |
kenjiArai | 0:8fc511bd51af | 45 | LPS25H_addr = addr; |
kenjiArai | 0:8fc511bd51af | 46 | LPS25H_mode = mode; |
kenjiArai | 0:8fc511bd51af | 47 | init(); |
kenjiArai | 0:8fc511bd51af | 48 | } |
kenjiArai | 0:8fc511bd51af | 49 | |
kenjiArai | 0:8fc511bd51af | 50 | /////////////// Initialize //////////////////////////////// |
kenjiArai | 0:8fc511bd51af | 51 | void LPS25H::init(void) |
kenjiArai | 0:8fc511bd51af | 52 | { |
kenjiArai | 0:8fc511bd51af | 53 | _i2c.frequency(100000); |
kenjiArai | 0:8fc511bd51af | 54 | // Check acc is available of not |
kenjiArai | 0:8fc511bd51af | 55 | dt[0] = LPS25H_WHO_AM_I; |
kenjiArai | 0:8fc511bd51af | 56 | _i2c.write(LPS25H_addr, dt, 1, true); |
kenjiArai | 0:8fc511bd51af | 57 | _i2c.read(LPS25H_addr, dt, 1, false); |
kenjiArai | 0:8fc511bd51af | 58 | if (dt[0] == I_AM_LPS25H) { |
kenjiArai | 0:8fc511bd51af | 59 | LPS25H_id = I_AM_LPS25H; |
kenjiArai | 0:8fc511bd51af | 60 | LPS25H_ready = 1; |
kenjiArai | 0:8fc511bd51af | 61 | } else { |
kenjiArai | 0:8fc511bd51af | 62 | LPS25H_id = 0; |
kenjiArai | 0:8fc511bd51af | 63 | LPS25H_ready = 0; |
kenjiArai | 0:8fc511bd51af | 64 | return; // acc chip is NOT on I2C line then terminate |
kenjiArai | 0:8fc511bd51af | 65 | } |
kenjiArai | 0:8fc511bd51af | 66 | if (LPS25H_mode == FIFO_HW_FILTER){ |
kenjiArai | 0:8fc511bd51af | 67 | // Hardware digital filter |
kenjiArai | 0:8fc511bd51af | 68 | // AN4450 April 2014 Rev1 P20/26, Filter enabling and suggested configuration |
kenjiArai | 0:8fc511bd51af | 69 | dt[0] = LPS25H_RES_CONF; |
kenjiArai | 0:8fc511bd51af | 70 | dt[1] = 0x05; |
kenjiArai | 0:8fc511bd51af | 71 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 72 | dt[0] = LPS25H_FIFO_CTRL; |
kenjiArai | 0:8fc511bd51af | 73 | dt[1] = 0xdf; |
kenjiArai | 0:8fc511bd51af | 74 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 75 | dt[0] = LPS25H_CTRL_REG2; |
kenjiArai | 0:8fc511bd51af | 76 | dt[1] = 0x40; |
kenjiArai | 0:8fc511bd51af | 77 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 78 | dt[0] = LPS25H_CTRL_REG1; |
kenjiArai | 0:8fc511bd51af | 79 | dt[1] = 0x90; |
kenjiArai | 0:8fc511bd51af | 80 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 81 | } else { |
kenjiArai | 0:8fc511bd51af | 82 | dt[0] = LPS25H_CTRL_REG2; |
kenjiArai | 0:8fc511bd51af | 83 | dt[1] = 0x0; |
kenjiArai | 0:8fc511bd51af | 84 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 85 | dt[0] = LPS25H_CTRL_REG1; |
kenjiArai | 0:8fc511bd51af | 86 | dt[1] = CR_STD_SET; |
kenjiArai | 0:8fc511bd51af | 87 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 88 | } |
kenjiArai | 0:8fc511bd51af | 89 | } |
kenjiArai | 0:8fc511bd51af | 90 | |
kenjiArai | 0:8fc511bd51af | 91 | /////////////// Start conv. and gwt all data ////////////// |
kenjiArai | 0:8fc511bd51af | 92 | void LPS25H::get(void) |
kenjiArai | 0:8fc511bd51af | 93 | { |
kenjiArai | 0:8fc511bd51af | 94 | if (LPS25H_ready == 0) { |
kenjiArai | 0:8fc511bd51af | 95 | press = 0; |
kenjiArai | 0:8fc511bd51af | 96 | temp = 0; |
kenjiArai | 0:8fc511bd51af | 97 | return; |
kenjiArai | 0:8fc511bd51af | 98 | } |
kenjiArai | 0:8fc511bd51af | 99 | dt[0] = LPS25H_PRESS_POUT_XL | 0x80; |
kenjiArai | 0:8fc511bd51af | 100 | _i2c.write(LPS25H_addr, dt, 1, true); |
kenjiArai | 0:8fc511bd51af | 101 | _i2c.read(LPS25H_addr, dt, 3, false); |
kenjiArai | 0:8fc511bd51af | 102 | press = dt[2] << 16 | dt[1] << 8 | dt[0]; |
kenjiArai | 0:8fc511bd51af | 103 | dt[0] = LPS25H_TEMP_OUT_L | 0x80; |
kenjiArai | 0:8fc511bd51af | 104 | _i2c.write(LPS25H_addr, dt, 1, true); |
kenjiArai | 0:8fc511bd51af | 105 | _i2c.read(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 106 | temp = dt[1] << 8 | dt[0]; |
kenjiArai | 0:8fc511bd51af | 107 | } |
kenjiArai | 0:8fc511bd51af | 108 | |
kenjiArai | 0:8fc511bd51af | 109 | /////////////// Read data from sensor ///////////////////// |
kenjiArai | 0:8fc511bd51af | 110 | float LPS25H::pressure() |
kenjiArai | 0:8fc511bd51af | 111 | { |
kenjiArai | 0:8fc511bd51af | 112 | return (float)press / 4096; |
kenjiArai | 0:8fc511bd51af | 113 | } |
kenjiArai | 0:8fc511bd51af | 114 | |
kenjiArai | 0:8fc511bd51af | 115 | /////////////// Read data from sensor ///////////////////// |
kenjiArai | 0:8fc511bd51af | 116 | float LPS25H::temperature() |
kenjiArai | 0:8fc511bd51af | 117 | { |
kenjiArai | 0:8fc511bd51af | 118 | return (float)temp / 480 + 42.5; |
kenjiArai | 0:8fc511bd51af | 119 | } |
kenjiArai | 0:8fc511bd51af | 120 | |
kenjiArai | 0:8fc511bd51af | 121 | /////////////// ID //////////////////////////////////////// |
kenjiArai | 0:8fc511bd51af | 122 | uint8_t LPS25H::read_id() |
kenjiArai | 0:8fc511bd51af | 123 | { |
kenjiArai | 0:8fc511bd51af | 124 | dt[0] = LPS25H_WHO_AM_I; |
kenjiArai | 0:8fc511bd51af | 125 | _i2c.write(LPS25H_addr, dt, 1, true); |
kenjiArai | 0:8fc511bd51af | 126 | _i2c.read(LPS25H_addr, dt, 1, false); |
kenjiArai | 0:8fc511bd51af | 127 | return (uint8_t)dt[0]; |
kenjiArai | 0:8fc511bd51af | 128 | } |
kenjiArai | 0:8fc511bd51af | 129 | |
kenjiArai | 0:8fc511bd51af | 130 | /////////////// I2C Freq. ///////////////////////////////// |
kenjiArai | 0:8fc511bd51af | 131 | void LPS25H::frequency(int hz) |
kenjiArai | 0:8fc511bd51af | 132 | { |
kenjiArai | 0:8fc511bd51af | 133 | _i2c.frequency(hz); |
kenjiArai | 0:8fc511bd51af | 134 | } |
kenjiArai | 0:8fc511bd51af | 135 | |
kenjiArai | 0:8fc511bd51af | 136 | /////////////// General purpose R/W /////////////////////// |
kenjiArai | 0:8fc511bd51af | 137 | uint8_t LPS25H::read_reg(uint8_t addr) |
kenjiArai | 0:8fc511bd51af | 138 | { |
kenjiArai | 0:8fc511bd51af | 139 | if (LPS25H_ready == 1) { |
kenjiArai | 0:8fc511bd51af | 140 | dt[0] = addr; |
kenjiArai | 0:8fc511bd51af | 141 | _i2c.write(LPS25H_addr, dt, 1, true); |
kenjiArai | 0:8fc511bd51af | 142 | _i2c.read(LPS25H_addr, dt, 1, false); |
kenjiArai | 0:8fc511bd51af | 143 | } else { |
kenjiArai | 0:8fc511bd51af | 144 | dt[0] = 0xff; |
kenjiArai | 0:8fc511bd51af | 145 | } |
kenjiArai | 0:8fc511bd51af | 146 | return (uint8_t)dt[0]; |
kenjiArai | 0:8fc511bd51af | 147 | } |
kenjiArai | 0:8fc511bd51af | 148 | |
kenjiArai | 0:8fc511bd51af | 149 | void LPS25H::write_reg(uint8_t addr, uint8_t data) |
kenjiArai | 0:8fc511bd51af | 150 | { |
kenjiArai | 0:8fc511bd51af | 151 | if (LPS25H_ready == 1) { |
kenjiArai | 0:8fc511bd51af | 152 | dt[0] = addr; |
kenjiArai | 0:8fc511bd51af | 153 | dt[1] = data; |
kenjiArai | 0:8fc511bd51af | 154 | _i2c.write(LPS25H_addr, dt, 2, false); |
kenjiArai | 0:8fc511bd51af | 155 | } |
kenjiArai | 0:8fc511bd51af | 156 | } |