Error[Pe020]: Identifier is Undefined in Vector Table for RTOS-based ADC Interrupt: A Comprehensive Guide

Are you stuck with the frustrating Error[Pe020] while working on your RTOS-based ADC Interrupt project? Don’t worry, you’re not alone! This error can be a real hurdles for many developers, but fear not, for we’ve got you covered. In this article, we’ll dive deep into the world of vector tables, RTOS, and ADC interrupts to help you troubleshoot and resolve this error once and for all.

Understanding the Error[Pe020]

The Error[Pe020] is a common compiler error that occurs when the identifier (a variable or function name) is undefined in the vector table for RTOS-based ADC Interrupt. This error can arise due to several reasons, including:

• Incorrect or missing function declaration
• Typo in the function name
• Mismatch between the function prototype and definition
• Incorrectly configured vector table

In the following sections, we’ll explore each of these reasons and provide step-by-step solutions to resolve the Error[Pe020].

Reason 1: Incorrect or Missing Function Declaration

A function declaration is essential to inform the compiler about the existence and signature of a function. If the function declaration is missing or incorrect, the compiler will throw the Error[Pe020]. To resolve this issue, follow these steps:

1. Check if the function is declared in the header file (usually with a .h or .hpp extension)
2. Verify that the function declaration matches the function definition (in terms of return type, function name, and parameter list)
3. Ensure that the function declaration is visible to the compiler (i.e., it’s not hidden within a conditional compilation block)

// Example of a correct function declaration
void ADC_IRQHandler(void);

// Corresponding function definition
void ADC_IRQHandler(void) {
  // Interrupt handler code
}

Reason 2: Typo in the Function Name

A simple typo in the function name can lead to the Error[Pe020]. To resolve this issue, follow these steps:

1. Double-check the function name in the vector table and the corresponding function definition
2. Verify that the function name is spelled correctly and matches the declaration
3. Use a consistent naming convention throughout the project

// Example of a correct function name
void ADC_IRQHandler(void);

// Incorrect function name (typo)
void ADC_IRHandler(void);

Reason 3: Mismatch between Function Prototype and Definition

A mismatch between the function prototype and definition can also cause the Error[Pe020]. To resolve this issue, follow these steps:

1. Verify that the function prototype and definition have the same return type
2. Check that the function prototype and definition have the same number and type of parameters
3. Ensure that the function prototype and definition are consistent in terms of function name and spelling

// Example of a correct function prototype and definition
void ADC_IRQHandler(void);

void ADC_IRQHandler(void) {
  // Interrupt handler code
}

// Incorrect function prototype (mismatched return type)
int ADC_IRQHandler(void);

void ADC_IRQHandler(void) {
  // Interrupt handler code
}

Reason 4: Incorrectly Configured Vector Table

The vector table is a crucial component in RTOS-based systems, and an incorrectly configured vector table can lead to the Error[Pe020]. To resolve this issue, follow these steps:

1. Verify that the vector table is correctly configured and populated with the correct vector addresses
2. Check that the vector table is correctly linked to the interrupt handler functions
3. Ensure that the vector table is consistent across the project (i.e., no duplicate or missing entries)

Vector Table Entry	Address
ADC_IRQHandler	0x20000000
Timer_IRQHandler	0x20000004

Additional Tips and Tricks

In addition to the above solutions, here are some additional tips and tricks to help you troubleshoot and resolve the Error[Pe020]:

• Use a consistent naming convention throughout the project
• Use meaningful and descriptive variable and function names
• Keep the vector table organized and tidy
• Use a version control system to track changes and collaborate with team members
• Test and verify the code regularly to catch errors early

Conclusion

In conclusion, the Error[Pe020] can be a frustrating and challenging error to resolve, but by following the steps and solutions outlined in this article, you should be able to troubleshoot and fix the issue. Remember to double-check your function declarations, vector table, and function names for typos and mismatches. With patience, persistence, and attention to detail, you’ll be able to overcome the Error[Pe020] and get your RTOS-based ADC Interrupt project up and running smoothly.

Happy coding!

Frequently Asked Question

Stuck with the “Error[Pe020]: identifier is undefined in vector table for RTOS-based ADC Interrupt”? Don’t worry, we’ve got you covered! Check out these 5 frequently asked questions and their answers to get back on track.