218 lines
6.2 KiB
C
218 lines
6.2 KiB
C
/*
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* Driver for barometic pressure sensor ms511-01BA03
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*
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* Copyright (C) 2016 Bernhard Guillon <Bernhard.Guillon@web.de>
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*
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* Loosely based on hmc5831 with:
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* Copyright (C) 2016 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#include "ms561101ba03.h"
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#include <i2c/i2c.h>
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#include <espressif/esp_common.h>
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#include "FreeRTOS.h"
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#include "task.h"
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#define CONVERT_D1 0x40
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#define CONVERT_D2 0x50
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#define ADC_READ 0x00
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/*
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* FIXME:
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* The chip has different response times for the different oversampling rates
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* (0.5 ms/1.1ms/2.1ms/4.1ms/8.22ms)
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* For now use a save value.
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*/
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#define CONVERSION_TIME 20 / portTICK_PERIOD_MS // milliseconds
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static const uint8_t RESET = 0x1E;
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static inline bool reset(uint8_t addr)
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{
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uint8_t buf[1] = { RESET };
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return i2c_slave_write(addr, buf, 1);
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}
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static inline bool read_prom(ms561101ba03_t *dev)
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{
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uint8_t tmp[2] = {0,0};
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if (!i2c_slave_read(dev->addr, 0xA2 , tmp, 2))
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return false;
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dev->config_data.sens = tmp[0] << 8 | tmp[1];
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if (!i2c_slave_read(dev->addr, 0xA4 , tmp, 2))
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return false;
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dev->config_data.off = tmp[0] << 8 | tmp[1];
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if (!i2c_slave_read(dev->addr, 0xA6 , tmp, 2))
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return false;
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dev->config_data.tcs = tmp[0] << 8 | tmp[1];
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if (!i2c_slave_read(dev->addr, 0xA8 , tmp, 2))
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return false;
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dev->config_data.tco = tmp[0] << 8 | tmp[1];
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if (!i2c_slave_read(dev->addr, 0xAA , tmp, 2))
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return false;
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dev->config_data.t_ref = tmp[0] << 8 | tmp[1];
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if (!i2c_slave_read(dev->addr, 0xAC , tmp, 2))
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return false;
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dev->config_data.tempsens = tmp[0] << 8 | tmp[1];
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return true;
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}
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static inline bool start_pressure_conversion(ms561101ba03_t *dev) //D1
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{
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uint8_t buf = CONVERT_D1 + dev->osr;
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return i2c_slave_write(dev->addr, &buf, 1);
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}
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static inline bool start_temperature_conversion(ms561101ba03_t *dev) //D2
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{
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uint8_t buf = CONVERT_D2 + dev->osr;
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return i2c_slave_write(dev->addr, &buf, 1);
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}
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static inline bool read_adc(uint8_t addr, uint32_t *result)
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{
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*result = 0;
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uint8_t tmp[3];
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if (!i2c_slave_read(addr, 0x00, tmp, 3))
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return false;
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*result = (tmp[0] << 16) | (tmp[1] << 8) | tmp[2];
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// If we are to fast the ADC will return 0 instead of the actual result
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if (*result == 0)
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return false;
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return true;
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}
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static inline void calc_dt(ms561101ba03_t *dev, uint32_t digital_temperature)
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{
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// Difference between actual and reference digital_temperature
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// dT = D2 - T_ref = D2 - C5 *2^8
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dev->dT = digital_temperature - ((int32_t)dev->config_data.t_ref << 8);
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}
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static inline int32_t calc_temp(ms561101ba03_t *dev)
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{
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// Actual temerature (-40...85C with 0.01 resulution)
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// TEMP = 20C +dT * TEMPSENSE =2000 + dT * C6 / 2^23
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return (int32_t)((int64_t)2000 +(int64_t)dev->dT * (int64_t)dev->config_data.tempsens / (int64_t)8388608);
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}
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static inline int64_t calc_off(ms561101ba03_t *dev)
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{
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// Offset at actual temperature
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// OFF=OFF_t1 + TCO * dT = OFF_t1(C2) * 2^16 + (C4*dT)/2^7
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return (int64_t)((int64_t)dev->config_data.off * (int64_t)65536) + (((int64_t)dev->config_data.tco * (int64_t)dev->dT ) /(int64_t)128);
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}
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static inline int64_t calc_sens(ms561101ba03_t *dev)
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{
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// Senisitivity at actual temperature
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// SENS=SENS_t1 + TCS *dT = SENS_t1(C1) *2^15 + (TCS(C3) *dT)/2^8
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return (int64_t)(((int64_t)dev->config_data.sens) *(int64_t)32768) + (((int64_t)dev->config_data.tcs * (int64_t)dev->dT ) /(int64_t)256);
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}
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static inline int32_t calc_p(uint32_t digital_pressure, int64_t sens, int64_t off)
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{
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// Temperature compensated pressure (10...1200mbar with 0.01mbar resolution
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// P = digital pressure value * SENS - OFF = (D1 * SENS/2^21 -OFF)/2^15
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return (int32_t) (((int64_t)digital_pressure * (int64_t)((int64_t)sens / (int64_t)0x200000) - (int64_t)off) / (int64_t)32768);
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}
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static inline bool get_raw_temperature(ms561101ba03_t *dev, uint32_t *result)
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{
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if (!start_temperature_conversion(dev))
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return false;
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vTaskDelay(CONVERSION_TIME);
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if (!read_adc(dev->addr, result))
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return false;
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return true;
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}
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static inline bool get_raw_pressure(ms561101ba03_t *dev, uint32_t *result)
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{
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if (!start_pressure_conversion(dev))
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return false;
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vTaskDelay(CONVERSION_TIME);
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if (!read_adc(dev->addr, result))
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return false;
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return true;
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}
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/////////////////////////Public//////////////////////////////////////
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bool ms561101ba03_get_sensor_data(ms561101ba03_t *dev)
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{
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// Second order temperature compensation see datasheet p8
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uint32_t raw_pressure = 0;
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if (!get_raw_pressure(dev, &raw_pressure))
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return false;
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uint32_t raw_temperature = 0;
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if(!get_raw_temperature(dev, &raw_temperature))
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return false;
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calc_dt(dev, raw_temperature);
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int64_t temp = calc_temp(dev);
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int64_t off = calc_off(dev);
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int64_t sens = calc_sens(dev);
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//Set defaults for temp >= 2000
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int64_t t_2 = 0;
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int64_t off_2 = 0;
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int64_t sens_2 = 0;
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int64_t help = 0;
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if (temp < 2000)
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{
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//Low temperature
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t_2 = ((dev->dT * dev->dT) >> 31); // T2 = dT^2/2^31
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help = (temp-2000);
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help = 5 * help * help;
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off_2 = help >> 1; // OFF_2 = 5 * (TEMP - 2000)^2/2^1
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sens_2 = help >> 2; // SENS_2 = 5 * (TEMP - 2000)^2/2^2
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if(temp < -1500)
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{
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// Very low temperature
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help = (temp+1500);
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help = help * help;
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off_2 = off_2 + 7 * help; // OFF_2 = OFF_2 + 7 * (TEMP + 1500)^2
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sens_2 = sens_2 + ((11 * help) >> 1); // SENS_2 = SENS_2 + 7 * (TEMP + 1500)^2/2^1
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}
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}
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temp = temp - t_2;
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off = off - off_2;
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sens = sens - sens_2;
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dev->result.pressure = calc_p(raw_pressure, sens, off);
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dev->result.temperature = (int32_t)temp;
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return true;
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}
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bool ms561101ba03_init(ms561101ba03_t *dev)
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{
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// First of all we need to reset the chip
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if(!reset(dev->addr))
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return false;
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// Wait a bit for the device to reset
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vTaskDelay(CONVERSION_TIME);
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// Get the config
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if(!read_prom(dev))
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return false;
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// Every thing went fine
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return true;
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}
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