137 lines
3.3 KiB
C++
137 lines
3.3 KiB
C++
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#include "MicroBit.h"
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#include "nrf_soc.h"
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/**
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* Constructor.
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* Create new object that can sense temperature.
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* @param id the ID of the new MicroBitThermometer object.
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*
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* Example:
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* @code
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* thermometer(MICROBIT_ID_THERMOMETER);
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* @endcode
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*
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* Possible Events:
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* @code
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* MICROBIT_THERMOMETER_EVT_CHANGED
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* @endcode
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*/
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MicroBitThermometer::MicroBitThermometer(uint16_t id)
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{
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this->id = id;
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this->samplePeriod = MICROBIT_THERMOMETER_PERIOD;
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this->sampleTime = 0;
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uBit.addIdleComponent(this);
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}
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/**
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* Gets the current temperature of the microbit.
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* @return the current temperature, in degrees celsius.
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*
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* Example:
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* @code
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* uBit.thermometer.getTemperature();
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* @endcode
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*/
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int MicroBitThermometer::getTemperature()
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{
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if (isSampleNeeded())
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updateTemperature();
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return temperature;
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}
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/**
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* Indicates if we'd like some processor time to sense the temperature. 0 means we're not due to read the tmeperature yet.
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* @returns 1 if we'd like some processor time, 0 otherwise.
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*/
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int MicroBitThermometer::isIdleCallbackNeeded()
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{
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return isSampleNeeded();
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}
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/**
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* periodic callback.
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* Check once every second or so for a new temperature reading.
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*/
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void MicroBitThermometer::idleTick()
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{
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if (isSampleNeeded())
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updateTemperature();
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}
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/**
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* Determines if we're due to take another temeoratur reading
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* @return 1 if we're due to take a temperature reading, 0 otherwise.
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*/
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int MicroBitThermometer::isSampleNeeded()
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{
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return ticks >= sampleTime;
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}
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/**
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* Set the sample rate at which the temperatureis read (in ms).
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* n.b. the temperature is alwasy read in the background, so wis only updated
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* when the processor is idle, or when the temperature is explicitly read.
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* The default sample period is 1 second.
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* @param period the requested time between samples, in milliseconds.
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*/
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void MicroBitThermometer::setPeriod(int period)
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{
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samplePeriod = period;
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}
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/**
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* Reads the currently configured sample rate of the thermometer.
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* @return The time between samples, in milliseconds.
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*/
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int MicroBitThermometer::getPeriod()
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{
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return samplePeriod;
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}
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/**
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* Updates our recorded temperature from the many sensors on the micro:bit!
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*/
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void MicroBitThermometer::updateTemperature()
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{
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int32_t processorTemperature;
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// For now, we just rely on the nrf senesor to be the most accurate.
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// The compass module also has a temperature sensor, and has the lowest power consumption, so will run the cooler...
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// ...however it isn't trimmed for accuracy during manufacture, so requires calibration.
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if (uBit.ble)
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{
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// If Bluetooth is enabled, we need to go through the Nordic software to safely do this
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sd_temp_get(&processorTemperature);
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}
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else
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{
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// Othwerwise, we access the information directly...
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uint32_t *TEMP = (uint32_t *)0x4000C508;
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NRF_TEMP->TASKS_START = 1;
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while (NRF_TEMP->EVENTS_DATARDY == 0);
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NRF_TEMP->EVENTS_DATARDY = 0;
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processorTemperature = *TEMP;
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NRF_TEMP->TASKS_STOP = 1;
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}
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// Record our reading...
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temperature = processorTemperature / 4;
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// Schedule our next sample.
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sampleTime = ticks + samplePeriod;
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// Send an event to indicate that we'e updated our temperature.
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MicroBitEvent e(id, MICROBIT_THERMOMETER_EVT_UPDATE);
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}
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