Overview#
This application implements the peripheral role. It:
Advertises using a connectable advertiser
Enables temperature service
Records a new temperature reading every second
Updates the temperature in the temperature service any time a new temperature is recorded
Running the demo#
If you paired to another phone before, first perform a full flash erase and reprogram the application. The HCIOT_PERIPH device must be forgotten/unpaired on the smartphone after reflashing the application, since the bonding passkey is lost on the MCXW23.
1.There are two possible modes for the MCXW23 at startup: 1.A. Upon the first startup, the MCXW23 automatically enters shelf-mode. 1.A.1.the expected output is shown below: Using bdAddr from UUID bd_addr = ed:41:cf:0f:d9:ce Eventstore content: Last recorded device state: 0 Flash erase done Entering device state 1 Flash write done
1.A.2.Press WAKEUP button to enter active state and start advertising.
The expected output is similar to the following:
Using bdAddr from UUID
bd_addr = ed:41:cf:0f:d9:ce
Eventstore content:
0s: Device state changed to 1
0s: Device state changed to 2
0s: Radio state changed to advertising
Last recorded device state: 2
Entering device state 2
Start ADV
Flash erase done
Flash write done
Measurement initiated
Measurement started
Measurement done @ 5: 21
1.B.1.If the application has already run, The MCXW23 automatically starts advertising so no need to press the WAKEUP button.
The expected output is similar to the following:
Using bdAddr from UUID
bd_addr = 7f:6d:8b:36:fc:ef
Eventstore content:
1s: Device state changed to 1
0s: Device state changed to 2
0s: Radio state changed to advertising
Last recorded device state: 2
Entering device state 2
Start ADV
Flash erase done
Flash write done
Measurement initiated
Measurement done @ 7: 27
Measurement initiated
Measurement done @ 8: 27
Measurement initiated
Measurement done @ 9: 27
Open NXP IoT toolbox on your smartphone.
Click on “Thermometer”
There are two possible scenarios: the health_care_iot_peripheral bonding feature is either enabled or disabled:
4.A. Bonding Disabled: 4.A.1. The app lists a device called “HCIOT_PERIPH” marked as ‘Unbonded’. Click on it. 4.A.2. The Thermometer window is opened. Thermometer and Sensor Location both show ‘—’ 4.A.3. wait for a moment to simulate a temperature measurement. A measurement for the ambient temperature value is shown on the smartphone with name of the sensor location.
4.B. Bonding Enabled: There are two possible scenarios when the bonding feature is enabled: 4.B.A The health_care_iot_peripheral is not paired yet (first time): 4.B.A.1. The app lists a device called “HCIOT_PERIPH” marked as ‘Unbonded’. Click on it. 4.B.A.2. The Thermometer window is opened. The status is Disconnected. Thermometer and Sensor Location both show ‘—’ 4.B.A.3. Click on ‘Connect’. 4.B.A.4. A pop-up called ‘Bluetooth pairing request’ is opened to enter the passkey for bonding, Enter 999999. 4.B.A.5. Wait for a moment to simulate a temperature measurement. A measurement for the ambient temperature value is shown on the smartphone with name of the sensor location.
4.B.B The health_care_iot_peripheral is already paired : 4.B.B.1. The app lists a device called "HCIOT_PERIPH" marked as 'Bonded'. Click on it. 4.B.B.2. The Thermometer window is opened. The status is Connected. Thermometer and Sensor Location both show '---' 4.B.B.3. Wait for a moment to simulate a temperature measurement. A measurement for the ambient temperature value is shown on the smartphone with name of the sensor location.
DC-DC Bypass in Low Power#
To enable HV_SM mode with DC-DC bypass during low power states, define:
#define SUPPLY_MODE_DCDCBYPASS 1
This configuration allows the DC-DC converter to be bypassed when entering low-power states, which can provide additional power savings depending on the application requirements
Power Profiling Mode#
The application supports a low-power profiling mode designed to minimize power consumption
Configuration#
To enable power profiling mode, set the following define:
#define BLE_POWER_PROFILING 1
Please note that this mode disables the watchdog, Brown-out Detection (BOD), memory profiling, the battery measurement task, and the temperature measurement task.
Supported boards:#
FRDM-MCXW23
MCXW23-EVK
Supported Boards#
MCXW23-EVK
Hardware requirements
Type-C USB cable
MCXW23-EVK Board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Connect a USB cable between the host PC and the EVK board J33.
Open a serial terminal with the following settings:
460800 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
FRDM-MCXW23
Hardware requirements
Type-C USB cable
FRDM-MCXW23 Board
Personal Computer
Board settings
No special settings are required.
Prepare the Demo
Connect a USB cable between the host PC and the FRDM board J10.
Open a serial terminal with the following settings:
460800 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.