PICCOLO Motor Controller Sample Design using TMS320F28023PT with Proteus Simulation

Introduction

This project demonstrates a PICCOLO motor controller sample design implemented using the TMS320F28023PT Piccolo microcontroller and tested through Proteus simulation. It focuses on core embedded-system startup routines, timing control, and hardware-safe initialization commonly required in motor-control firmware. The design is ideal for learners exploring microcontroller projects, embedded systems, and practical electronics using virtual simulation. By combining low-level assembly routines with Proteus VSM, this project helps bridge theory and real-world motor-control firmware behavior.

How the Project Works (Overview)

The project initializes the Piccolo DSP correctly after boot, disables the watchdog timer if required, and provides a precise microsecond delay routine. These are essential building blocks in motor-control applications where deterministic startup and timing accuracy are critical. The schematic connects the microcontroller to external loads and indicators, allowing behavior observation during Proteus simulation without physical hardware.

Block Diagram / Workflow Explanation

1. Boot ROM Exit
   After reset, execution is redirected to a custom code start location.

2. Watchdog Handling
   The firmware optionally disables the watchdog timer to avoid unintended resets during development.

3. C Runtime Initialization
   Control is passed to the standard C runtime entry point.

4. Delay Routine Execution
   A calibrated microsecond delay function provides accurate timing for control logic.

5. Peripheral Interaction
   GPIO and connected outputs respond according to the running firmware, observable in simulation.

Key Features

• Uses TMS320F28023PT Piccolo DSP for motor-control-oriented applications

• Safe boot redirection using a dedicated codestart section

• Optional watchdog timer disable for stable development testing

• Accurate microsecond delay routine executed from zero-waitstate RAM

• Fully testable using Proteus VSM simulation

• Low-level assembly implementation suitable for real-time embedded systems

Components Used

• TMS320F28023PT Piccolo microcontroller

• Seven-segment displays (simulation indicators)

• DC motor (simulation load)

• +12V supply (motor side)

• Proteus VSM digital analysis tools

Applications

• Motor control firmware prototyping

• Embedded systems education and training

• DSP startup and boot-sequence testing

• Timing-critical control applications

• DIY electronics and controller validation using simulation

Explanation of the Code (High-Level)

The firmware is written in assembly and split into two functional modules:

• Code Start & Watchdog Control
  Handles boot redirection and safely disables the watchdog timer before jumping to the C runtime initialization routine.

• Microsecond Delay Routine
  Implements a calibrated loop-based delay function that depends on CPU clock frequency. This routine is intended to run from internal RAM to maintain timing accuracy, which is critical for motor control and real-time applications.

Source Code

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;//  The C assembly call from the DELAY_US(time) macro will
;//  look as follows: 
;//
;//  extern void Delay(long LoopCount);                
;//
;//        MOV   AL,#LowLoopCount
;//        MOV   AH,#HighLoopCount
;//        LCR   _Delay
;//
;//  Or as follows (if count is less then 16-bits):
;//
;//        MOV   ACC,#LoopCount
;//        LCR   _Delay

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Complete Source Code

Proteus Simulation

The Proteus simulation allows observation of DSP startup behavior, GPIO activity, and timing-dependent operations without physical hardware. The motor and display elements respond based on firmware execution, while the digital analyzer helps verify timing and signal transitions.

Conclusion

This PICCOLO motor controller sample design provides a clean, practical foundation for understanding DSP startup routines, watchdog handling, and precise timing in embedded systems. By combining low-level firmware with Proteus simulation, the project offers strong educational value and a solid base for advanced motor-control development.

Complete File

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PICCOLO Motor Controller Sample Design using TMS320F28023PT with Proteus Simulation