Keil5 Interrupt Debugging Practical Guide

# 1. Keil5 Interrupt Debugging Fundamentals

Interrupts are a crucial mechanism for handling asynchronous events in embedded systems. As a popular integrated development environment (IDE), Keil5 offers powerful interrupt debugging features that assist developers in efficiently debugging interrupt programs. This chapter will introduce the basics of Keil5 interrupt debugging, including debugging tools, breakpoint settings, and single-step debugging.

# 2. Interrupt Debugging Techniques

### 2.1 Debugging Tools and Methods

#### 2.1.1 Overview of the Keil5 Debugger

The Keil5 debugger is a powerful tool for debugging interrupts in embedded systems. It provides a range of features, including:

- **Breakpoint Settings:** Allows you to set breakpoints in the code, pausing the program when execution reaches that point.
- **Single-Step Debugging:** Enables line-by-line code execution and inspection of variable values and register states.
- **Register Viewing:** Allows you to view and modify registers used in the program.
- **Stack Tracing:** Enables examination of the program stack and identification of functions that call interrupt handlers.

#### 2.1.2 Breakpoint Settings and Single-Step Debugging

Breakpoints are a common technique for debugging interrupts. By setting breakpoints in the code, the program can be paused when execution reaches that point. This allows for the inspection of variable values, register states, and stack information to understand the reasons for and handling of interrupt triggers.

Single-step debugging is another useful technique. It allows for line-by-line code execution and inspection of variable values and register states after each step. This aids in understanding the execution flow of interrupt handlers and identifying any potential issues.

### 2.2 Interrupt Debugging Tips

#### 2.2.1 Analysis of Interrupt Trigger Conditions

Understanding interrupt trigger conditions is crucial for debugging interrupts. Interrupts can be triggered by various events, such as external interrupts, timer overflows, or software requests. Analyzing interrupt trigger conditions helps identify interrupt sources and understand when interrupt handlers are executed.

#### 2.2.2 Tracking Interrupt Handling Processes

Tracking interrupt handling processes is essential for understanding how interrupts are executed. This includes identifying functions that call interrupt handlers, the code executed within the handlers, and the program flow after handler returns. Tracking interrupt handling processes helps identify any errors or issues within the handlers.

#### 2.2.3 Analysis of Interrupt Registers and Stack

Analyzing interrupt registers and stack can provide valuable information about interrupt handling. Interrupt registers contain information about the interrupt source and priority. The stack contains information about the functions that call interrupt handlers. Analyzing interrupt registers and stack helps identify the causes and handling methods of interrupt triggers.

# 3. Interrupt Debugging in Practice

### 3.1 Debugging External Interrupts

#### 3.1.1 Interrupt Initialization and Configuration

Debugging external interrupts requires completing interrupt initialization and configuration, including interrupt pin configuration, selection of interrupt trigger methods, and setting interrupt priorities.

**Interrupt Pin Configuration**

Use the Keil5 Pin Configuration tool to configure interrupt pins, selecting external interrupt pins and setting the interrupt trigger method.

**Selection of Interrupt Trigger Methods**

External interrupts support various trigger methods, including falling edge trigger, rising edge trigger, and both edge trigger. Choose the appropriate trigger method based on actual application needs.

**Setting Interrupt Priorities**

Interrupt priority determines the order of interrupt responses, with higher priority interrupts being responded to first. In Keil5, interrupt priorities can be configured by setting the IPR and ISER registers in the NVIC.

#### 3.1.2 Writing Interrupt Handler Functions

The external interrupt handler function is the code executed when an i