Analyze Peripheral Access
- Review the data sheets and peripheral documentation to understand the expected access size for each peripheral register. This information is crucial to determine the right data types to use.
- Check your hardware abstraction layer (HAL) or any provided SDK to see if there are predefined macros or typedefs for register access.
- Utilize a debugger to inspect the peripheral registers' correct memory addresses and sizes as defined by the hardware specifications.
Inspect and Refactor Code
- Go through the codebase and identify where each peripheral is accessed. Pay attention to any hard-coded access sizes that might be different from the documented sizes.
- Replace incorrect access sizes with the correct ones. Use types such as `uint8_t`, `uint16_t`, `uint32_t`, etc., based on the peripheral's access size requirements. For instance:
\`\`\`c
volatile uint16_t peripheralreg = (uint16t)PERIPHERAL_BASE\_ADDRESS;
\`\`\`
- Implement or update macros and functions that encapsulate register reads and writes, ensuring they use the correct data size:
\`\`\`c
#define READ\_REG16(addr) (_(volatile uint16\_t_)(addr))
\`\`\`
Use Compiler Checks
- Leverage compiler warnings and errors to catch incorrect data types. Enable warnings for implicit type conversions that can lead to unexpected behavior.
- Use static analysis tools to detect possible incorrect access sizes. These tools can pinpoint discrepancies between your code and the system's hardware configuration.
Perform Verification and Testing
- Implement unit tests that validate each peripheral's access size and behavior. These tests should mock or simulate peripheral interaction to ensure correctness.
- Create integration tests that involve end-to-end verification of system behavior, checking for data integrity and functionality correctness.
- Use a logic analyzer or oscilloscope to capture real-world peripheral interactions, confirming the correct number of data lines are toggling as expected.
Document Changes
- Update any inline comments and documentation related to the peripheral's access sizes, ensuring future developers understand the reasons behind each access size choice.
- Maintain a change log or commit messages that detail the fixes made, including the incorrect access sizes and how they were rectified.
