C++ driver software code for Maxim Integrated MAX31723/MAX31722 device temperature sensor. The MAX31723 provides 9 to 12 bits of resolution.
Dependents: MAX31723_Thermostat_Thermometer_Sensor
max31723.cpp
- Committer:
- phonemacro
- Date:
- 2019-02-12
- Revision:
- 6:2e49aa7fa091
- Parent:
- 5:8e70ec0923e2
- Child:
- 8:e310e55a687b
File content as of revision 6:2e49aa7fa091:
/******************************************************************************* * Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* */ #include "max31723.h" #include "USBSerial.h" union max31723_raw_data { struct { uint8_t lsb; uint8_t msb; }; uint16_t uwrd; int16_t swrd; }; MAX31723::MAX31723(SPI &spi, DigitalOut &ce_pin) : m_spi(spi), m_chip_enable(ce_pin) { m_chip_enable = 0; } int MAX31723::read_reg(uint8_t &val, uint8_t reg) { if (reg <= MAX31723_REG_MAX) { m_chip_enable = 1; m_spi.write(reg); val = m_spi.write(0); m_chip_enable = 0; return MAX31723_NO_ERROR; } else { printf("Input read_reg is invalid, 0x%02X \r\n", reg); return MAX31723_ERROR; } } uint8_t MAX31723::read_cfg() { uint8_t cfg; read_reg(cfg, MAX31723_REG_CFG); return cfg; } float MAX31723::read_reg_as_temperature(uint8_t reg) { max31723_raw_data raw; float temperature; if (reg >= MAX31723_REG_TEMP_LSB && reg <= MAX31723_REG_MAX) { read_reg(raw.lsb, reg); read_reg(raw.msb, reg+1); temperature = raw.swrd * MAX31723_CF_LSB; return temperature; } else { printf("Input read_registers_as_temperature is invalid, %d r\n", reg); return 0; } } float MAX31723::read_temperature(void) { return read_reg_as_temperature(MAX31723_REG_TEMP_LSB); } float MAX31723::read_trip_low(void) { return read_reg_as_temperature(MAX31723_REG_TRIP_LO_LSB); } float MAX31723::read_trip_high(void) { return read_reg_as_temperature(MAX31723_REG_TRIP_HI_LSB); } int MAX31723::write_reg(uint8_t val, uint8_t reg) { if (reg == (MAX31723_REG_CFG | MAX31723_WRITE_MASK) || (reg >= (MAX31723_REG_TRIP_HI_LSB | MAX31723_WRITE_MASK) && reg <= (MAX31723_REG_MAX | MAX31723_WRITE_MASK)) ) { m_chip_enable = 1; m_spi.write(reg); m_spi.write(val); m_chip_enable = 0; return MAX31723_NO_ERROR; } else { printf("Input write_reg is invalid, 0x%02X \r\n", reg); return MAX31723_ERROR; } } int MAX31723::write_cfg(uint8_t val) { m_chip_enable = 1; m_spi.write(MAX31723_REG_CFG ); m_spi.write(val); m_chip_enable = 0; return MAX31723_NO_ERROR; } int MAX31723::write_trip_low(float temperature) { int ret; max31723_raw_data raw; temperature /= MAX31723_CF_LSB; raw.swrd = int16_t(temperature); ret = write_reg(raw.lsb, MAX31723_WRITE_MASK | MAX31723_REG_TRIP_LO_LSB); wait(.015); ret = write_reg(raw.msb, MAX31723_WRITE_MASK | MAX31723_REG_TRIP_LO_MSB); wait(.015); return ret; } int MAX31723::write_trip_high(float temperature) { int ret; max31723_raw_data raw; temperature /= MAX31723_CF_LSB; raw.swrd = int16_t(temperature); ret = write_reg(raw.lsb, MAX31723_WRITE_MASK | MAX31723_REG_TRIP_HI_LSB); wait(.015); ret = write_reg(raw.msb, MAX31723_WRITE_MASK | MAX31723_REG_TRIP_HI_MSB); wait(.015); return ret; } int MAX31723::perform_one_shot(uint8_t resolution, uint8_t interrupt_mode) { if (resolution <= MAX31723_CFG_RESOLUTION_12BIT) { write_reg(0, MAX31723_REG_CFG | MAX31723_WRITE_MASK); write_reg(interrupt_mode | MAX31723_CFG_1SHOT | resolution | MAX31723_CFG_STANDBY, MAX31723_REG_CFG | MAX31723_WRITE_MASK); } else return MAX31723_ERROR; return MAX31723_NO_ERROR; } int MAX31723::perform_one_shot_int(uint8_t resolution) { int ret; ret = perform_one_shot(resolution, MAX31723_CFG_TM_MODE_INTERRUPT); return ret; } int MAX31723::perform_one_shot_comparator(uint8_t resolution) { int ret; ret = perform_one_shot(resolution, 0); return ret; } float MAX31723::celsius_to_fahrenheit(float temp_c) { float temp_f; temp_f = ((temp_c * 9)/5) + 32; return temp_f; } MAX31723::~MAX31723(void) { //empty block }