Maxim Integrated / Mbed OS MAX30205_Demo

Dependencies:   MAX30205 max32630fthr

Fork of MAX30205_Demo by John Greene

main.cpp@4:7865b145ff3c, 2017-08-22 (annotated)

Committer:
coreyharris
Date:
Tue Aug 22 21:54:03 2017 +0000
Revision:
4:7865b145ff3c
Parent:
3:4a8ab8ffd52d
Child:
5:fb64c72bb867
Fixed whitespace, added comments (post code review)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
coreyharris 0:6e28e543a11c 1 #include "mbed.h"
coreyharris 0:6e28e543a11c 2 #include "max32630fthr.h"
coreyharris 0:6e28e543a11c 3 #include "MAX30205.h"
coreyharris 0:6e28e543a11c 4
coreyharris 0:6e28e543a11c 5 MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
coreyharris 0:6e28e543a11c 6
coreyharris 0:6e28e543a11c 7 bool temp_sensor_config(MAX30205 &temp_sensor);
coreyharris 0:6e28e543a11c 8
coreyharris 0:6e28e543a11c 9 int main()
coreyharris 0:6e28e543a11c 10 {
coreyharris 0:6e28e543a11c 11
coreyharris 3:4a8ab8ffd52d 12 Serial pc(USBTX, USBRX); // Use USB debug probe for serial link
coreyharris 3:4a8ab8ffd52d 13 pc.baud(115200); // Baud rate = 115200
coreyharris 0:6e28e543a11c 14
coreyharris 3:4a8ab8ffd52d 15 DigitalOut rLed(LED1, LED_OFF); // Debug LEDs
coreyharris 0:6e28e543a11c 16 DigitalOut gLed(LED2, LED_OFF);
coreyharris 0:6e28e543a11c 17 DigitalOut bLed(LED3, LED_OFF);
coreyharris 0:6e28e543a11c 18
coreyharris 3:4a8ab8ffd52d 19 I2C i2cBus(I2C1_SDA, I2C1_SCL); // I2C bus, P3_4 = SDA, P3_5 = SCL
coreyharris 0:6e28e543a11c 20
coreyharris 4:7865b145ff3c 21 MAX30205 temp_sensor(i2cBus, 0x48); // New MAX30205 on i2cBus
coreyharris 4:7865b145ff3c 22 int rc = temp_sensor_config(temp_sensor); // Configure sensor, return 0 on success
coreyharris 0:6e28e543a11c 23
coreyharris 4:7865b145ff3c 24 Timer temp_sensor_sampleTimer; // Create temp. sensor sample timer
coreyharris 3:4a8ab8ffd52d 25 temp_sensor_sampleTimer.start(); // Start the timer
coreyharris 0:6e28e543a11c 26
coreyharris 0:6e28e543a11c 27 MAX30205::Configuration_u temp_cfg;
coreyharris 0:6e28e543a11c 28 uint16_t rawTemperatureRead, temp_conversion_flag;
coreyharris 0:6e28e543a11c 29 float temperature;
coreyharris 0:6e28e543a11c 30
coreyharris 0:6e28e543a11c 31 while(1) {
coreyharris 0:6e28e543a11c 32
coreyharris 0:6e28e543a11c 33 if( rc == 0 ) {
coreyharris 0:6e28e543a11c 34
coreyharris 4:7865b145ff3c 35 // Start a new temperature conversion
coreyharris 4:7865b145ff3c 36 if ( ( temp_sensor_sampleTimer.read() > 1.0f ) && !temp_conversion_flag && ( rc == 0 ) ) {
coreyharris 0:6e28e543a11c 37
coreyharris 0:6e28e543a11c 38 temp_cfg.bits.one_shot = 1;
coreyharris 2:cf07a3eb2f30 39 rc = temp_sensor->writeConfiguration(temp_cfg); // Send one-shot cmd to begin conversion
coreyharris 2:cf07a3eb2f30 40 temp_conversion_flag = 1; // Raise flag indicating a conversion has begun
coreyharris 0:6e28e543a11c 41
coreyharris 0:6e28e543a11c 42 }
coreyharris 0:6e28e543a11c 43
coreyharris 4:7865b145ff3c 44 // Read the completed temperature conversion
coreyharris 4:7865b145ff3c 45 if ( ( temp_sensor_sampleTimer.read() > 1.05f ) && temp_conversion_flag && ( rc == 0 ) ){
coreyharris 0:6e28e543a11c 46
coreyharris 2:cf07a3eb2f30 47 temp_conversion_flag = 0; // Lower flag when conversion has completed
coreyharris 2:cf07a3eb2f30 48 rc = temp_sensor->readTemperature(rawTemperatureRead); // Read the temperature data
coreyharris 2:cf07a3eb2f30 49 temperature = temp_sensor->toCelsius(rawTemperatureRead); // Convert temp data to Celsius
coreyharris 2:cf07a3eb2f30 50 temp_sensor_sampleTimer.reset(); // Reset timer
coreyharris 0:6e28e543a11c 51
coreyharris 0:6e28e543a11c 52 pc.printf("Temperature is %2.3f deg. C \r\n", temperature);
coreyharris 0:6e28e543a11c 53
coreyharris 0:6e28e543a11c 54 }
coreyharris 0:6e28e543a11c 55
coreyharris 0:6e28e543a11c 56 }else{
coreyharris 4:7865b145ff3c 57
coreyharris 3:4a8ab8ffd52d 58 pc.printf("Something went wrong, check the I2C bus and power connections... \r\n");
coreyharris 0:6e28e543a11c 59 bLed = LED_OFF;
coreyharris 0:6e28e543a11c 60 gLed = LED_OFF;
coreyharris 4:7865b145ff3c 61
coreyharris 0:6e28e543a11c 62 while(1){
coreyharris 0:6e28e543a11c 63 rLed = !rLed;
coreyharris 0:6e28e543a11c 64 wait(0.5);
coreyharris 0:6e28e543a11c 65 }
coreyharris 4:7865b145ff3c 66
coreyharris 0:6e28e543a11c 67 }
coreyharris 0:6e28e543a11c 68 }
coreyharris 0:6e28e543a11c 69 }
coreyharris 0:6e28e543a11c 70
coreyharris 0:6e28e543a11c 71
coreyharris 0:6e28e543a11c 72 bool temp_sensor_config(MAX30205 &temp_sensor){
coreyharris 0:6e28e543a11c 73
coreyharris 0:6e28e543a11c 74 int rc = 0;
coreyharris 0:6e28e543a11c 75
coreyharris 3:4a8ab8ffd52d 76 MAX30205::Configuration_u temp_cfg;
coreyharris 3:4a8ab8ffd52d 77 temp_cfg.all = 0;
coreyharris 3:4a8ab8ffd52d 78 temp_cfg.bits.shutdown = 1; // Shutdown mode
coreyharris 3:4a8ab8ffd52d 79 temp_cfg.bits.comp_int = 1; // Interrupt mode
coreyharris 3:4a8ab8ffd52d 80 temp_cfg.bits.os_polarity = 0; // Active low OS
coreyharris 3:4a8ab8ffd52d 81 temp_cfg.bits.fault_queue = 1; // Two faults for OS condition
coreyharris 3:4a8ab8ffd52d 82 temp_cfg.bits.data_format = 0; // Normal data format
coreyharris 3:4a8ab8ffd52d 83 temp_cfg.bits.timeout = 0; // I2C timeout reset enabled
coreyharris 3:4a8ab8ffd52d 84 temp_cfg.bits.one_shot = 0; // Start with one-shot = 0
coreyharris 0:6e28e543a11c 85
coreyharris 3:4a8ab8ffd52d 86 rc = temp_sensor.writeConfiguration(temp_cfg); // Write config to MAX30205
coreyharris 0:6e28e543a11c 87
coreyharris 0:6e28e543a11c 88 return rc;
coreyharris 0:6e28e543a11c 89 }