void mp_hal_delay_ms(mp_uint_t ms) {
if (ms <= 0) {
return;
}
// Wraparound of tick is taken care of by 2's complement arithmetic
uint64_t start = system_timer_current_time();
while (system_timer_current_time() - start < (uint64_t)ms) {
// Check for any pending events, like a KeyboardInterrupt
mp_handle_pending();
// Enter sleep mode, waiting for (at least) the SysTick interrupt
__WFI();
}
}
/**
* Updates the temperature sample of this instance of MicroBitThermometer
* only if isSampleNeeded() indicates that an update is required.
*
* This call also will add the thermometer to fiber components to receive
* periodic callbacks.
*
* @return MICROBIT_OK on success.
*/
int MicroBitThermometer::updateSample()
{
if(!(status & MICROBIT_THERMOMETER_ADDED_TO_IDLE))
{
// If we're running under a fiber scheduer, register ourselves for a periodic callback to keep our data up to date.
// Otherwise, we do just do this on demand, when polled through our read() interface.
fiber_add_idle_component(this);
status |= MICROBIT_THERMOMETER_ADDED_TO_IDLE;
}
// check if we need to update our sample...
if(isSampleNeeded())
{
int32_t processorTemperature;
uint8_t sd_enabled;
// For now, we just rely on the nrf senesor to be the most accurate.
// The compass module also has a temperature sensor, and has the lowest power consumption, so will run the cooler...
// ...however it isn't trimmed for accuracy during manufacture, so requires calibration.
sd_softdevice_is_enabled(&sd_enabled);
if (sd_enabled)
{
// If Bluetooth is enabled, we need to go through the Nordic software to safely do this
sd_temp_get(&processorTemperature);
}
else
{
// Othwerwise, we access the information directly...
uint32_t *TEMP = (uint32_t *)0x4000C508;
NRF_TEMP->TASKS_START = 1;
while (NRF_TEMP->EVENTS_DATARDY == 0);
NRF_TEMP->EVENTS_DATARDY = 0;
processorTemperature = *TEMP;
NRF_TEMP->TASKS_STOP = 1;
}
// Record our reading...
temperature = processorTemperature / 4;
// Schedule our next sample.
sampleTime = system_timer_current_time() + samplePeriod;
// Send an event to indicate that we'e updated our temperature.
MicroBitEvent e(id, MICROBIT_THERMOMETER_EVT_UPDATE);
}
return MICROBIT_OK;
};
//% help=input/running-time weight=50 blockGap=8
//% blockId=device_get_running_time block="running time (ms)"
//% advanced=true
int runningTime() {
return system_timer_current_time();
}
/*---------------------------------------------------------------------------*/
clock_time_t
clock_time(void)
{
return system_timer_current_time();
}
/**
* Determines if we're due to take another temperature reading
*
* @return 1 if we're due to take a temperature reading, 0 otherwise.
*/
int MicroBitThermometer::isSampleNeeded()
{
return system_timer_current_time() >= sampleTime;
}
mp_uint_t mp_hal_ticks_ms(void) {
return system_timer_current_time();
}
