This example project will show user how to use and configure the basic functionalities of WKPU + GPT RTC API.
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* Test HW: S32K3X4EVB-T172 (SCH-53148 REV B2) or S32K344MINI-EVB
* MCU: S32K344
* IDE: S32DS3.5 & S32DS3.6
* SDK release: RTD 6.0.0
* Debugger: PE Micro
* Target: internal_FLASH
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This example routine configures the WKPU & RTC units for wake-up. The RTC is present in always ON domain, hence available in RUN mode as well as in STANDBY mode.
The chip contains one instance of RTC (Real Time Clock) timer and API (Autonomous Periodic Interrupt) timer, where both can perform 32-bit comparisons. Both RTC and API timers can generate interrupts as well as wake-up from low power modes.
The following figure highlights the path for RTC API wake-up. Please refer to Chapter 69.3.2 API functional description from the S32K3XX reference manual (Rev. 12) for further information.
The routine waits for SW5 to be pressed, then:
- Turns off the green LED
- Switches CORE_CLK to Option C - Boot Standby mode (CORE_CLK @ 24 MHz).
- Initializes the ICU driver.
- Configures RTC_API channel (WKPU0)
- Initializes GPT module.
- Starts timer and sets RTC_API_TIME.
- Enters standby.
After the period defined, RTC API generates an interruption and MCU wakes up. After wake-up, MCU resets and polls for SW5 to be pressed again.
The RTC API value can be changed with RTC_API_TIME definition.
