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# HAL: Low-power timer
This code example demonstrates how to configure a low-power timer to measure the timing between events in free-running mode using the [LPTimer](https://infineon.github.io/mtb-hal-cat1/html/group__group__hal__lptimer.html) HAL resource.
Many applications require measuring the time gap between different events in the system for timekeeping or debugging. In this example, the time gap between successive user button press events is measured in seconds and displayed on a UART terminal.
[View this README on GitHub.](https://github.com/Infineon/mtb-example-hal-lptimer)
[Provide feedback on this code example.](https://cypress.co1.qualtrics.com/jfe/form/SV_1NTns53sK2yiljn?Q_EED=eyJVbmlxdWUgRG9jIElkIjoiQ0UyMzE4NDUiLCJTcGVjIE51bWJlciI6IjAwMi0zMTg0NSIsIkRvYyBUaXRsZSI6IkhBTDogTG93LXBvd2VyIHRpbWVyIiwicmlkIjoieWVrdCIsIkRvYyB2ZXJzaW9uIjoiMi4zLjAiLCJEb2MgTGFuZ3VhZ2UiOiJFbmdsaXNoIiwiRG9jIERpdmlzaW9uIjoiTUNEIiwiRG9jIEJVIjoiSUNXIiwiRG9jIEZhbWlseSI6IlBTT0MifQ==)
## Requirements
- [ModusToolbox™ software](https://www.infineon.com/modustoolbox) v3.0 or later
- Board support package (BSP) minimum required version for:
- PSoC™ 6 MCU: v4.1.0
- CYW920829M2EVK-02: v1.0.2
- CYW989829M2EVB-01: v1.0.1
- Programming language: C
- Associated parts: All [PSoC™ 6 MCU](https://www.infineon.com/cms/en/product/microcontroller/32-bit-psoc-arm-cortex-microcontroller/psoc-6-32-bit-arm-cortex-m4-mcu/) parts and [AIROC™ CYW20829 Bluetooth® LE SoC](https://www.infineon.com/cms/en/product/promopages/airoc20829)
## Supported toolchains (make variable 'TOOLCHAIN')
- GNU Arm® embedded compiler v10.3.1 (`GCC_ARM`) - Default value of `TOOLCHAIN`
- Arm® compiler v6.16 (`ARM`)
- IAR C/C++ compiler v9.30.1 (`IAR`)
## Supported kits (make variable 'TARGET')
- [PSoC™ 6 Wi-Fi Bluetooth® prototyping kit](https://www.infineon.com/CY8CPROTO-062-4343W) (`CY8CPROTO-062-4343W`) – Default value of `TARGET`
- [AIROC™ CYW20829 Bluetooth® LE evaluation kit](https://www.infineon.com/CYW920829M2EVK-02) (`CYW920829M2EVK-02`)
- AIROC™ CYW89829 Bluetooth® LE evaluation kit (`CYW989829M2EVB-01`)
- [PSoC™ 6 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CY8CKIT-062-WIFI-BT) (`CY8CKIT-062-WIFI-BT`)
- [PSoC™ 6 Bluetooth® LE pioneer kit](https://www.infineon.com/CY8CKIT-062-BLE) (`CY8CKIT-062-BLE`)
- [PSoC™ 6 Bluetooth® LE prototyping kit](https://www.infineon.com/CY8CPROTO-063-BLE) (`CY8CPROTO-063-BLE`)
- [PSoC™ 62S2 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CY8CKIT-062S2-43012) (`CY8CKIT-062S2-43012`)
- [PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CYW9P62S1-43438EVB-01) (`CYW9P62S1-43438EVB-01`)
- [PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CYW9P62S1-43012EVB-01) (`CYW9P62S1-43012EVB-01`)
- [PSoC™ 62S3 Wi-Fi Bluetooth® prototyping kit](https://www.infineon.com/CY8CPROTO-062S3-4343W) (`CY8CPROTO-062S3-4343W`)
- [EZ-BLE Arduino Evaluation Board](https://www.infineon.com/cms/en/product/evaluation-boards/cyble-416045-eval/) (`CYBLE-416045-EVAL`)
- [PSoC™ 64 "Secure Boot" Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CY8CKIT-064B0S2-4343W) (`CY8CKIT-064B0S2-4343W`)
- [PSoC™ 64 Standard Secure - AWS Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CY8CKIT-064S0S2-4343W) (`CY8CKIT-064S0S2-4343W`)
- [PSoC™ 62S4 pioneer kit](https://www.infineon.com/CY8CKIT-062S4) (`CY8CKIT-062S4`)
- [PSoC™ 62S2 evaluation kit](https://www.infineon.com/CY8CEVAL-062S2) (`CY8CEVAL-062S2`, `CY8CEVAL-062S2-LAI-4373M2`, `CY8CEVAL-062S2-MUR-43439M2`)
## Hardware setup
This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.
**Note:** The PSoC™ 6 Bluetooth® LE pioneer kit (CY8CKIT-062-BLE) and the PSoC™ 6 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. The ModusToolbox™ software requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the [Firmware Loader](https://github.com/Infineon/Firmware-loader) GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".
The AIROC™ CYW20829 Bluetooth® LE evaluation kit (CYW920829M2EVK-02) ships with KitProg3 version 2.21 installed. The ModusToolbox™ software requires KitProg3 with latest version 2.40. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the [Firmware Loader](https://github.com/Infineon/Firmware-loader) GitHub repository. If you do not upgrade, you will see an error such as "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".
## Software setup
Install a terminal emulator if you don't have one. Instructions in this document use [Tera Term](https://ttssh2.osdn.jp/index.html.en).
This example requires no additional software or tools.
## Using the code example
Create the project and open it using one of the following:
<details><summary><b>In Eclipse IDE for ModusToolbox&trade; software</b></summary>
1. Click the **New Application** link in the **Quick Panel** (or, use **File** > **New** > **ModusToolbox&trade; Application**). This launches the [Project Creator](https://www.infineon.com/ModusToolboxProjectCreator) tool.
2. Pick a kit supported by the code example from the list shown in the **Project Creator - Choose Board Support Package (BSP)** dialog.
When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the [Library Manager](https://www.infineon.com/ModusToolboxLibraryManager) to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the **Quick Panel**.
You can also just start the application creation process again and select a different kit.
If you want to use the application for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.
3. In the **Project Creator - Select Application** dialog, choose the example by enabling the checkbox.
4. (Optional) Change the suggested **New Application Name**.
5. The **Application(s) Root Path** defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the *Application(s) Root Path* value. Applications that share libraries should be in the same root path.
6. Click **Create** to complete the application creation process.
For more details, see the [Eclipse IDE for ModusToolbox&trade; software user guide](https://www.infineon.com/MTBEclipseIDEUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mt_ide_user_guide.pdf*).
</details>
<details><summary><b>In command-line interface (CLI)</b></summary>
ModusToolbox&trade; software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The CLI tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the *{ModusToolbox&trade; software install directory}/tools_{version}/project-creator/* directory.
Use a CLI terminal to invoke the "project-creator-cli" tool. On Windows, use the command line "modus-shell" program provided in the ModusToolbox&trade; software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox&trade; software tools. You can access it by typing `modus-shell` in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.
The "project-creator-cli" tool has the following arguments:
Argument | Description | Required/optional
---------|-------------|-----------
`--board-id` | Defined in the `<id>` field of the [BSP](https://github.com/Infineon?q=bsp-manifest&type=&language=&sort=) manifest | Required
`--app-id` | Defined in the `<id>` field of the [CE](https://github.com/Infineon?q=ce-manifest&type=&language=&sort=) manifest | Required
`--target-dir`| Specify the directory in which the application is to be created if you prefer not to use the default current working directory | Optional
`--user-app-name`| Specify the name of the application if you prefer to have a name other than the example's default name | Optional
<br />
The following example clones the "[Low-power timer](https://github.com/Infineon/mtb-example-hal-lptimer)" application with the desired name "Lptimer" configured for the *CY8CKIT-062-WIFI-BT* BSP into the specified working directory, *C:/mtb_projects*:
```
project-creator-cli --board-id CY8CKIT-062-WIFI-BT --app-id mtb-example-hal-lptimer --user-app-name Lptimer --target-dir "C:/mtb_projects"
```
**Note:** The project-creator-cli tool uses the `git clone` and `make getlibs` commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the [ModusToolbox&trade; software user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).
To work with a different supported kit later, use the [Library Manager](https://www.infineon.com/ModusToolboxLibraryManager) to choose the BSP for the supported kit. You can invoke the Library Manager GUI tool from the terminal using `make library-manager` command or use the Library Manager CLI tool "library-manager-cli" to change the BSP.
The "library-manager-cli" tool has the following arguments:
Argument | Description | Required/optional
---------|-------------|-----------
`--add-bsp-name` | Name of the BSP that should be added to the application | Required
`--set-active-bsp` | Name of the BSP that should be as active BSP for the application | Required
`--add-bsp-version`| Specify the version of the BSP that should be added to the application if you do not wish to use the latest from manifest | Optional
`--add-bsp-location`| Specify the location of the BSP (local/shared) if you prefer to add the BSP in a shared path | Optional
<br />
Following example adds the CY8CPROTO-062-4343W BSP to the already created application and makes it the active BSP for the app:
```
library-manager-cli --project "C:/mtb_projects/Lptimer" --add-bsp-name CY8CPROTO-062-4343W --add-bsp-version "latest-v4.X" --add-bsp-location "local"
library-manager-cli --project "C:/mtb_projects/Lptimer" --set-active-bsp APP_CY8CPROTO-062-4343W
```
</details>
<details><summary><b>In third-party IDEs</b></summary>
Use one of the following options:
- **Use the standalone [Project Creator](https://www.infineon.com/ModusToolboxProjectCreator) tool:**
1. Launch Project Creator from the Windows Start menu or from *{ModusToolbox&trade; software install directory}/tools_{version}/project-creator/project-creator.exe*.
2. In the initial **Choose Board Support Package** screen, select the BSP, and click **Next**.
3. In the **Select Application** screen, select the appropriate IDE from the **Target IDE** drop-down menu.
4. Click **Create** and follow the instructions printed in the bottom pane to import or open the exported project in the respective IDE.
<br />
- **Use command-line interface (CLI):**
1. Follow the instructions from the **In command-line interface (CLI)** section to create the application, and then import the libraries using the `make getlibs` command.
2. Export the application to a supported IDE using the `make <ide>` command.
3. Follow the instructions displayed in the terminal to create or import the application as an IDE project.
For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the [ModusToolbox&trade; software user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).
</details>
## Operation
If using a PSoC&trade; 64 "Secure" MCU kit (like CY8CKIT-064B0S2-4343W), the PSoC&trade; 64 device must be provisioned with keys and policies before being programmed. Follow the instructions in the ["Secure Boot" SDK user guide](https://www.infineon.com/dgdlac/Infineon-PSoC_64_Secure_MCU_Secure_Boot_SDK_User_Guide-Software-v07_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0f8c361a7666) to provision the device. If the kit is already provisioned, copy-paste the keys and policy folder to the application folder.
1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.
2. Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud.
3. Program the board using one of the following:
<details><summary><b>Using Eclipse IDE for ModusToolbox&trade; software</b></summary>
1. Select the application project in the Project Explorer.
2. In the **Quick Panel**, scroll down, and click **\<Application Name> Program (KitProg3_MiniProg4)**.
</details>
<details><summary><b>Using CLI</b></summary>
From the terminal, execute the `make program` command to build and program the application using the default toolchain to the default target. The default toolchain and target are specified in the application's Makefile but you can override those values manually:
```
make program TOOLCHAIN=<toolchain>
```
Example:
```
make program TOOLCHAIN=GCC_ARM
```
</details>
4. Press and release the user button. The time is displayed on a UART terminal in seconds. This time corresponds to the interval between the two user button press events.
**Figure 1. Time interval between user button press events**
![](images/button_press.png)
## Debugging
You can debug the example to step through the code. In the IDE, use the **\<Application Name> Debug (KitProg3_MiniProg4)** configuration in the **Quick Panel**. For details, see the "Program and debug" section in the [Eclipse IDE for ModusToolbox&trade; software user guide](https://www.infineon.com/MTBEclipseIDEUserGuide).
**Note:** **(Only while debugging PSoC&trade; 6 MCU)** On the CM4 CPU, some code in `main()` may execute before the debugger halts at the beginning of `main()`. This means that some code executes twice – once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of `main()`. See [KBA231071](https://community.infineon.com/docs/DOC-21143) to learn about this and for the workaround.
## Design and implementation
### Resources and settings
**Table 1. Application resources**
| Resource | Alias/object | Purpose |
| :------- | :------------ | :------------ |
| LPTIMER (HAL) | lptimer_obj | lptimer object used to measure the timing between events |
| UART (HAL)|cy_retarget_io_uart_obj| UART HAL object used by retarget-io for debug UART port |
| GPIO (HAL) | CYBSP_USER_LED | User LED |
| GPIO (HAL) | CYBSP_USER_BTN | User button |
| UART (HAL) | cy_retarget_io_uart_obj | UART HAL object used by retarget-io for debug UART port |
This code example demonstrates how to configure a low-power timer to measure the timing between events in free-running mode using the [LPTimer](https://infineon.github.io/mtb-hal-cat1/html/group__group__hal__lptimer.html) HAL resource. The `cyhal_lptimer_init()` function is used to initialize the low-power timer with the default configuration. The information about the low-power timer, such as operating frequency, can be obtained using the `cyhal_lptimer_get_info()` function. The time between two presses of the user button is calculated based on this operating frequency.
The user button marks the start and end points of the events. Press of the user button interrupts the CPU and executes an user-defined interrupt service routine (ISR). The GPIO interrupt acts as a wakeup source to wake the CPU from deepsleep. The counter value is stored for each user button press. The time interval between two button presses is evaluated in seconds and displayed on the UART terminal.
The system can enter deepsleep mode only when the system is in idle state. The system will be in active state when the UART is still printing. The user LED is turned ON to indicate that the system is in active mode, and turned OFF when the system enters deepsleep mode.
The application uses the UART to print messages on the UART terminal. The UART resource initialization and retargeting of standard I/O to the UART port is done using the [retarget-io](https://github.com/Infineon/retarget-io) library.
## Related resources
Resources | Links
-----------|----------------------------------
Application notes | [AN228571](https://www.infineon.com/AN228571) – Getting started with PSoC&trade; 6 MCU on ModusToolbox&trade; software <br /> [AN215656](https://www.infineon.com/AN215656) – PSoC&trade; 6 MCU: Dual-CPU system design
Code examples | [Using ModusToolbox&trade; software](https://github.com/Infineon/Code-Examples-for-ModusToolbox-Software) on GitHub
Device documentation | [PSoC&trade; 6 MCU datasheets](https://documentation.infineon.com/html/psoc6/bnm1651211483724.html) <br /> [PSoC&trade; 6 MCU technical reference manuals](https://documentation.infineon.com/html/psoc6/zrs1651212645947.html) <br /> [AIROC&trade; CYW20829 Bluetooth&reg; LE SoC](https://www.infineon.com/cms/en/product/promopages/airoc20829)
Development kits | Select your kits from the [Evaluation board finder](https://www.infineon.com/cms/en/design-support/finder-selection-tools/product-finder/evaluation-board)
Libraries on GitHub | [mtb-pdl-cat1](https://github.com/Infineon/mtb-pdl-cat1) – PSoC&trade; 6 peripheral driver library (PDL) <br /> [mtb-hal-cat1](https://github.com/Infineon/mtb-hal-cat1) – Hardware abstraction layer (HAL) library <br /> [retarget-io](https://github.com/Infineon/retarget-io) – Utility library to retarget STDIO messages to a UART port
Middleware on GitHub | [capsense](https://github.com/Infineon/capsense) – CAPSENSE&trade; library and documents <br /> [psoc6-middleware](https://github.com/Infineon/modustoolbox-software#psoc-6-middleware-libraries) – Links to all PSoC&trade; 6 MCU middleware
Tools | [Eclipse IDE for ModusToolbox&trade; software](https://www.infineon.com/cms/en/design-support/tools/sdk/modustoolbox-software/) – ModusToolbox&trade; software is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC&trade; Wi-Fi and Bluetooth&reg; connectivity devices.
<br />
## Other resources
Infineon provides a wealth of data at [www.infineon.com](https://www.infineon.com) to help you select the right device, and quickly and effectively integrate it into your design.
For PSoC&trade; 6 MCU devices, see [How to design with PSoC&trade; 6 MCU - KBA223067](https://community.infineon.com/docs/DOC-14644) in the Infineon community.
## Document history
Document title: *CE231845* - *HAL: Low-power timer*
| Version | Description of change |
| ------- | ------------------------------------------------------------ |
| 1.0.0 | New code example |
| 2.0.0 | This code example version requires ModusToolbox&trade; software version 3.0 or later and is not backward compatible with v2.4 or older versions.
| 2.1.0 | Added support for CYW920829M2EVB-01. |
| 2.2.0 | Removed CYW920829M2EVB-01 from supported kits <br> Added support for CYBLE-416045-EVAL and CYW920829M2EVK-02 |
| 2.2.1 | Readme Update |
| 2.3.0 | Added support for CYW989829M2EVB-01 |
<br />
---------------------------------------------------------
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