Example of temperature limit detection for STTS751 in X-NUCLEO-IKS01A3
Dependencies: X_NUCLEO_IKS01A3
Temperature Limit Demo Application with STTS751 based on sensor expansion board X-NUCLEO-IKS01A3
Main function is to show how to detect exceeding of temperature limits using the sensor expansion board and send a notification using UART to a connected PC or Desktop and display it on terminal applications like TeraTerm.
After connection has been established:
- the user can heat up or cool down the board and view the data using an hyper terminal.
main.cpp
- Committer:
- cparata
- Date:
- 2019-05-24
- Revision:
- 3:3c8bce3cdf2f
- Parent:
- 0:1399adb8f248
- Child:
- 5:b747a8948606
File content as of revision 3:3c8bce3cdf2f:
/** ****************************************************************************** * @file main.cpp * @author SRA * @version V1.0.0 * @date 5-March-2019 * @brief Simple Example application for using the X_NUCLEO_IKS01A3 * MEMS Inertial & Environmental Sensor Nucleo expansion board. ****************************************************************************** * @attention * * <h2><center>© COPYRIGHT(c) 2019 STMicroelectronics</center></h2> * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** */ /* Includes */ #include "mbed.h" #include "XNucleoIKS01A3.h" /* Instantiate the expansion board */ static XNucleoIKS01A3 *mems_expansion_board = XNucleoIKS01A3::instance(D14, D15, D4, D5, A3, D6, A4); /* Retrieve the composing elements of the expansion board */ static STTS751Sensor *t_sensor = mems_expansion_board->t_sensor; DigitalOut myled(LED1); volatile int mems_event = 0; uint32_t previous_tick = 0; uint32_t current_tick = 0; uint8_t high = 0, low = 0; float temperature = 0.0f; char buffer[32]; void INT_cb(); /* Helper function for printing floats & doubles */ static char *print_double(char* str, double v, int decimalDigits=2) { int i = 1; int intPart, fractPart; int len; char *ptr; /* prepare decimal digits multiplicator */ for (;decimalDigits!=0; i*=10, decimalDigits--); /* calculate integer & fractinal parts */ intPart = (int)v; fractPart = (int)((v-(double)(int)v)*i); /* fill in integer part */ sprintf(str, "%i.", intPart); /* prepare fill in of fractional part */ len = strlen(str); ptr = &str[len]; /* fill in leading fractional zeros */ for (i/=10;i>1; i/=10, ptr++) { if (fractPart >= i) { break; } *ptr = '0'; } /* fill in (rest of) fractional part */ sprintf(ptr, "%i", fractPart); return str; } /* Simple main function */ int main() { /* Attach callback to STTS751 INT */ t_sensor->attach_int_irq(&INT_cb); /* Enable STTS751 temperature sensor */ t_sensor->enable(); /* Set ODR to 4Hz */ t_sensor->set_odr(4.0f); /* Set Low Temperature Threshold */ t_sensor->set_low_temp_thr(22.0f); /* Set High Temperature Threshold */ t_sensor->set_high_temp_thr(28.0f); /* Enable Event pin */ t_sensor->set_event_pin(1); /* Get beginning status */ t_sensor->get_temp_limit_status(NULL, NULL, NULL); previous_tick = clock(); printf("\r\n--- Starting new run ---\r\n"); while(1) { if (mems_event) { mems_event=0; uint8_t high_temp = 0, low_temp = 0; t_sensor->get_temp_limit_status(&high_temp, &low_temp, NULL); if (high_temp){ high = 1; low = 0; } if (low_temp){ low = 1; high = 0; } t_sensor->get_temperature(&temperature); myled = 1; wait(0.1); myled = 0; } current_tick = clock(); if (((current_tick - previous_tick)/CLOCKS_PER_SEC) >= 2){ if (!high && !low){ t_sensor->get_temperature(&temperature); } printf("Temp[C]: "); printf("%7s C", print_double(buffer, temperature)); if (high){ printf(" High temperature detected!(>28C) \r\n"); high = 0; } else if (low) { printf(" Low temperature detected!(<22C) \r\n"); low = 0; } else { printf("\r\n"); } previous_tick = clock(); } } } void INT_cb() { mems_event = 1; }