Getting started with HRTIM

This article explains what WDG is and how to use it through examples.

1. What is a HRTIM ?

HRTIM stands for High Resolution Timer. HRTIM is a highly accurate timer which can generate complex waveforms such as PWM, phase-shifted, constant Ton... with highly very fine timing resolution (184 ps on the STM32G4 series). In

1.1. HRTIM modes

Up-counters can operate in three modes :

• Continuous (also called Free-running) : it rolls over to zero when it exceeds the value
• Non-retriggerable :
• Retriggerable :

1.2. Block diagram overview

As we can see on the figure below, the HRTIM have a modular architecture. Let's have a look at each block :

• Block 1 Timing units are six 16-bits up or down counter and a master timer (independent of each other).
• Block 2 Set/Reset Crossbar allows to have the output pairs controlled not only by related timing unit but by external event and other timers.
• Block 3 Output stage manage pair of outputs with any kind of logic (polarity, safe states, asynchronous fault protection...).
• Block 4 Input block includes ten external events, five fault signals (protect the power stages and shutdown PWM outputs).
• Block 5 Interface part link the HRTimer with other timers, DMA, ADC and DAC with internal STM32 connections.

2. Configure the HRTIM to generate a simple PWM

2.1. Objective

• In this project, you will learn how to setup WWDG in STM32CubeIDE
• How to Generate Code in STM32CubeIDE and use HAL functions
• Create a simple application to test and periodically refresh the WWDG
• Verify the correct functionality on toggling LED

2.2. Creating the project in STM32CubeIDE

• File > New > STM32 Project in main panel.
  

2.4. Generate project and edit main.c

The easiest way to generate the code is to save your current project : Ctrl + S

2.5. Compile and flash

• Click on Build button
  
• Click on Debug button (to run step by step)
  
• Or on Run button (to execute)