Application Note Extraction

Read and extract practical implementation guidance from ST application notes (AN documents).

What Application Notes Contain

Application notes are practical guides from ST that bridge the gap between the reference manual (theoretical register descriptions) and real-world implementation. They provide:

• Step-by-step implementation procedures
• Reference designs and schematics
• Code examples and configuration snippets
• Performance measurements and benchmarks
• Troubleshooting tips and common pitfalls
• PCB layout recommendations

Where to Find Application Notes

Glob pattern: docs/application-notes/*.pdf

Application notes are shorter than reference manuals (typically 20-80 pages), making them easier to read in fewer passes.

Extraction Process

1. Glob docs/application-notes/*.pdf to list available AN documents
2. Identify which AN is relevant to the current task (use the catalog below)
3. Read the AN table of contents (page 1-2) to find relevant sections
4. Read the relevant sections (can often read larger page ranges than RM)
5. Extract implementation steps, configuration values, and code examples
6. Cross-reference extracted values with the reference manual register descriptions

Commonly Referenced Application Notes

Core/System

• AN2606 - STM32 microcontroller system memory boot mode (bootloader reference for ALL STM32)
• AN3155 - USART protocol used in the STM32 bootloader
• AN3156 - USB DFU protocol used in the STM32 bootloader
• AN4657 - STM32 in-application programming (IAP) using the USART

Peripherals

• AN4013 - STM32 cross-series timer overview (comprehensive timer guide)
• AN4031 - Using the STM32 DMA controller
• AN4776 - General-purpose timer cookbook
• AN4838 - Managing memory protection unit in STM32
• AN4655 - Virtually extending the number of serial communication peripherals

Analog

• AN4826 - STM32 ADC accuracy and performance
• AN2834 - How to get the best ADC accuracy in STM32
• AN3116 - STM32 ADC modes and their applications

Communication

• AN4221 - I2C protocol description and usage on STM32
• AN4286 - SPI protocol description and usage on STM32
• AN5765 - UART/USART usage on STM32

Power and Clock

• AN4488 - Getting started with STM32 power consumption optimization
• AN4491 - Getting started with STM32L4/L4+ power optimization

RTOS

• AN5365 - FreeRTOS with STM32

Hardware Design

• AN2867 - Oscillator design guide for STM32
• AN4661 - Getting started with STM32 hardware development
• AN1709 - EMC design guide for STM32

Security

• AN4701 - Proprietary code read-out protection on STM32
• AN5054 - Secure boot and secure firmware update
• AN5156 - Introduction to STM32 security

How to Use AN Information

When Configuring a Peripheral

1. First check if a relevant AN exists (use catalog above)
2. Read the AN for practical guidance and recommended configurations
3. Then read the RM for exact register values
4. The AN provides the "why" and best practices, the RM provides the "what"

When Troubleshooting

1. ANs often have "troubleshooting" sections
2. Check ADC accuracy ANs (AN4826, AN2834) for analog issues
3. Check timer AN (AN4013) for timing issues
4. Check oscillator AN (AN2867) for clock stability issues

Cross-Referencing with RM

AN documents reference RM register names but may not give exact bit positions. Always verify register values in the RM. ANs may cover multiple STM32 families with slightly different register layouts.

Output Format

## Application Note: AN[number] - [Title]

**Relevance**: [Why this AN is relevant to the current task]

**Key Findings**:
1. [Finding 1 with page reference]
2. [Finding 2 with page reference]
3. [Configuration values or code examples]

**Recommended Configuration**:
[Extracted configuration steps or register values]

**Cross-Reference with RM**:
[Which RM sections to verify these values against]

Additional Resources

• references/an-catalog-guide.md - Extended catalog with descriptions, keywords for matching ANs to tasks