Module imxrt_hal::tempmon

Temperature monitor.

IMPORTANT NOTE:

On 10xx MCUs, the temperature sensor uses and assumes that the bandgap reference, 480MHz PLL and 32KHz RTC modules are properly programmed and fully settled for correct operation.

Example 1

Manually triggered read

use imxrt_hal as hal;
use imxrt_ral as ral;

let inst = unsafe { ral::tempmon::TEMPMON::instance() };
let mut temp_mon = hal::tempmon::TempMon::new(inst);
loop {
    if let Ok(temperature) = nb::block!(temp_mon.measure_temp()) {
        // Temperature in mC (1°C = 1000°mC)
    }
}

Example 2

Non-blocking reading

use imxrt_hal::tempmon::TempMon;
use imxrt_ral as ral;

let inst = unsafe { ral::tempmon::TEMPMON::instance() };

// Init temperature monitor with 8Hz measure freq
// 0xffff = 2 Sec. Read more at `measure_freq()`
let mut temp_mon = TempMon::with_measure_freq(inst, 0x1000);
temp_mon.start();

let mut last_temp = 0_i32;
loop {
    // Get the last temperature read by the measure_freq
    if let Ok(temp) = temp_mon.get_temp() {
        if last_temp != temp {
            // Temperature changed
            last_temp = temp;
        }
        // Do something else
    }
}

Example 3

Low and high temperature Interrupt

NOTE: TEMP_LOW_HIGH is triggered for TempSensor low and TempSensor high

use imxrt_hal::tempmon::TempMon;
use imxrt_ral as ral;

let inst = unsafe { ral::tempmon::TEMPMON::instance() };

// Init temperature monitor with 8Hz measure freq
// 0xffff = 2 Sec. Read more at `measure_freq()`
let mut temp_mon = TempMon::with_measure_freq(inst, 0x1000);

// Set low_alarm, high_alarm, and panic_alarm temperature
temp_mon.set_alarm_values(-5_000, 65_000, 95_000);

// Use values from registers if you like to compare it somewhere
let (low_alarm, high_alarm, panic_alarm) = temp_mon.alarm_values();

// Enables interrupts for low_high_alarm
unsafe {
    cortex_m::peripheral::NVIC::unmask(ral::interrupt::TEMP_LOW_HIGH);
}

// Start could fail if the module is not powered up
if temp_mon.start().is_err() {
    temp_mon.power_up();
    temp_mon.start();
}

// #[cortex_m_rt::interrupt]
fn TEMP_LOW_HIGH() {
    // disable the interrupt to avoid endless triggers
    cortex_m::peripheral::NVIC::mask(ral::interrupt::TEMP_LOW_HIGH);

    // don't forget to enable it after the temperature is back to normal
}

Structs

• PowerDownError
  Indicates that the temperature monitor is powered down.
• TempMon
  A Temperature Monitor (TEMPMON)