2 * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 struct MAX31723Exception : public std::exception {
35 MAX31723Exception (std::string msg) : message (msg) { }
36 ~MAX31723Exception () throw () { }
37 const char* what() const throw () { return message.c_str(); }
40 MAX31723::MAX31723 (int csn) {
41 mraa_result_t error = MRAA_SUCCESS;
44 m_csnPinCtx = mraa_gpio_init (csn);
45 if (m_csnPinCtx == NULL) {
46 throw MAX31723Exception ("GPIO failed to initilize");
49 error = mraa_gpio_dir (m_csnPinCtx, MRAA_GPIO_OUT);
50 if (error != MRAA_SUCCESS) {
51 throw MAX31723Exception ("GPIO failed to initilize");
54 m_spi = mraa_spi_init (0);
56 throw MAX31723Exception ("SPI failed to initilize");
62 MAX31723::~MAX31723() {
63 mraa_result_t error = MRAA_SUCCESS;
65 error = mraa_spi_stop(m_spi);
66 if (error != MRAA_SUCCESS) {
67 mraa_result_print(error);
69 error = mraa_gpio_close (m_csnPinCtx);
70 if (error != MRAA_SUCCESS) {
71 mraa_result_print(error);
76 MAX31723::getTemperature () {
79 uint8_t buf[2] = { 0x01, 0x00};
83 uint8_t* x = mraa_spi_write_buf(m_spi, buf, 2);
85 printf ("%d\n", (uint16_t)*x);
87 /*mraa_spi_write (m_spi, R_TEMPERATURE_LSB);
88 lsb = mraa_spi_write (m_spi, lsb);
91 /*mraa_spi_write (m_spi, R_TEMPERATURE_MSB);
92 msb = mraa_spi_write (m_spi, msb);
94 if ((msb & 0x80) != 0)
95 msb |= ~((1 << 8) - 1);*/
110 return mraa_gpio_write (m_csnPinCtx, HIGH);
115 return mraa_gpio_write (m_csnPinCtx, LOW);