55.4.2. QEOV2_PWM_OUT

55.4.2.1. Overview

The QEO_PWM_OUT sample project demonstrates the functionality of QEOv2 (Quadrature Encoder Output Version 2) peripheral in generating PWM waveforms based on position information. QEOv2 can receive position information either through software injection or from hardware (such as MTGSEI), and generate PWM signals based on preset resolution lines.

55.4.2.2. Working Process

This example demonstrates two working modes:

  1. Software Position Injection Mode Configuration steps:

    • Initialize QEO module and configure PWM output mode

    • Configure PWM signal generation parameters:

      • Set resolution lines (4 lines)

      • Configure PWM force output table

      • Enable PWM signal output

    • Software position injection process:

      • Calculate position increment value

      • Enable software position injection

      • Cyclically inject position values for rotation

      • Wait for PWM signal generation

      • Disable position injection

  2. Hardware Position Input Mode

    In this example, the hardware generator provides position information to QEO, which generates PWM signals in real-time based on the received position information.

    Configuration steps:

    • Initialize QEO module with the same PWM parameters as software mode

    • Configure hardware position input:

      • Configure hardware position generator

      • Configure PWM safety mode table

      • Enable PWM signal output

    • Enable motor system timestamp function

55.4.2.3. Hardware Setting

Use oscilloscope/logic analyzer to observe the PWM waveforms on specified PWM output pins (Please refer to Pin Description section).

For MCU that does not support MTG peripheral, a QEI peripheral connected to an ABZ encoder (4000 lines) is required to provide hardware position input for testing.

55.4.2.4. Running the Example

When the project runs correctly, you will observe the following:

  1. Serial terminal output:

QEO PWM example
QEO generate PWM signal with software inject position
QEO generate PWM signal with hardware provide position

  1. PWM Signal Output:

Using oscilloscope/logic analyzer, you can observe two types of PWM waveforms: - PWM waveform in software position injection mode:

PWM Waveform in Software Injection Mode

  • PWM waveform in hardware position input mode:

PWM Waveform in Hardware Input Mode