Nuvoton / Mbed OS NuMaker-mbed-Sensor-MAX31875

NuMaker Thermo-Sensor MAX31875

Dependencies:   MAX31875_Temperature_Sensor_Low_Power

main.cpp@2:01a2b08b4621, 14 months ago (annotated)

Committer:
cyliang
Date:
Mon Mar 06 11:03:29 2023 +0000
Revision:
2:01a2b08b4621
Parent:
1:bc3ce35be52a 
Support M467 MikroBUS port 0 and port 1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
morgandu 0:c40fe84a8d1f 1 /*
morgandu 0:c40fe84a8d1f 2 * Copyright (c) 2019 Nuvoton Tecnology Corp. All rights reserved.
morgandu 0:c40fe84a8d1f 3 *
morgandu 0:c40fe84a8d1f 4 * This example uses MAX31875 library to read Thermo 6 Click
morgandu 0:c40fe84a8d1f 5 * (MAX31875 temperature sensor) which placed on mikroBUS of
morgandu 0:c40fe84a8d1f 6 * Nuvoton NuMaker-IoT-M487 board.
morgandu 0:c40fe84a8d1f 7 *
morgandu 0:c40fe84a8d1f 8 */
morgandu 0:c40fe84a8d1f 9
morgandu 0:c40fe84a8d1f 10 #include "mbed.h"
morgandu 0:c40fe84a8d1f 11 #include "max31875.h"
morgandu 0:c40fe84a8d1f 12 #include "max31875_cpp.h"
morgandu 0:c40fe84a8d1f 13
morgandu 0:c40fe84a8d1f 14 /* Declare the I2C of mikroBUS on board */
cyliang 2:01a2b08b4621 15 #if defined(TARGET_NUMAKER_IOT_M487)
cyliang 2:01a2b08b4621 16 I2C mikro_i2c(PG_3, PG_2); // PG_3: I2C1_SDA, PG_2: I2C1_SCL
cyliang 2:01a2b08b4621 17 #elif defined (TARGET_NUMAKER_IOT_M467)
cyliang 2:01a2b08b4621 18 /* MBUS0 PG_3: I2C1_SDA, PG_2: I2C1_SCL */
morgandu 0:c40fe84a8d1f 19 I2C mikro_i2c(PG_3, PG_2);
cyliang 2:01a2b08b4621 20 /* MBUS1 PG_9: I2C4_SCL, PG_10: I2C4_SDA */
cyliang 2:01a2b08b4621 21 // I2C mikro_i2c(PG_9, PG_10);
cyliang 2:01a2b08b4621 22 #else
cyliang 2:01a2b08b4621 23 #error define mikro i2c port for your board.
cyliang 2:01a2b08b4621 24 #endif
morgandu 0:c40fe84a8d1f 25
morgandu 0:c40fe84a8d1f 26 /* Declare the MAX31875 sensor */
morgandu 0:c40fe84a8d1f 27 MAX31875 temp_sensor(mikro_i2c, MAX31875_I2C_SLAVE_ADR_R0);
morgandu 0:c40fe84a8d1f 28
morgandu 0:c40fe84a8d1f 29 int main()
morgandu 0:c40fe84a8d1f 30 {
morgandu 0:c40fe84a8d1f 31 float f_temperature;
morgandu 0:c40fe84a8d1f 32
morgandu 0:c40fe84a8d1f 33 printf("\r\nmbed OS version is %d.\r\n", MBED_VERSION);
morgandu 0:c40fe84a8d1f 34 printf("Start to read temperature ...\r\n");
morgandu 0:c40fe84a8d1f 35
morgandu 0:c40fe84a8d1f 36 /* Set frequency of I2C bus to 1MHz */
morgandu 0:c40fe84a8d1f 37 mikro_i2c.frequency(1000000);
morgandu 0:c40fe84a8d1f 38
morgandu 0:c40fe84a8d1f 39 /* Configure temperature sensor for 8 times per second */
morgandu 0:c40fe84a8d1f 40 temp_sensor.write_cfg(MAX31875_CFG_CONV_RATE_8 | MAX31875_CFG_RESOLUTION_12BIT);
morgandu 0:c40fe84a8d1f 41
morgandu 0:c40fe84a8d1f 42 while(true)
morgandu 0:c40fe84a8d1f 43 {
morgandu 0:c40fe84a8d1f 44 /* It should wait at least 1/8 seconds for next read */
morgandu 0:c40fe84a8d1f 45 //wait(MAX31875_WAIT_CONV_RATE_8);
morgandu 0:c40fe84a8d1f 46 /* But to slow print out rate, wait 1 second here */
cyliang 1:bc3ce35be52a 47 ThisThread::sleep_for(1000ms); // wait(1);
morgandu 0:c40fe84a8d1f 48
morgandu 0:c40fe84a8d1f 49 f_temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TEMPERATURE);
morgandu 0:c40fe84a8d1f 50 printf("Temperature is %3.4f Celsius, %3.4f Fahrenheit\r\n",
morgandu 0:c40fe84a8d1f 51 f_temperature,
morgandu 0:c40fe84a8d1f 52 temp_sensor.celsius_to_fahrenheit(f_temperature));
morgandu 0:c40fe84a8d1f 53 }
morgandu 0:c40fe84a8d1f 54
morgandu 0:c40fe84a8d1f 55 }
morgandu 0:c40fe84a8d1f 56