ARM Register Bitfield Visualizer - Interactive Register Debug Tool
Visualize and manipulate ARM register bitfields interactively. Parse register definitions from header files, set individual bits, view masks and values. Perfect for debugging STM32, Cortex-M, and other ARM peripheral configurations.
Add Bitfield
Parse Register Definition
STM32 Registers
STM8 Registers
MSP430 Registers
Cortex-M Core Registers
Register Visualization (32-bit)
Hexadecimal:
0x00000000
Decimal:
0
Binary:
0b00000000000000000000000000000000
Defined Bitfields
No bitfields defined. Add fields manually or parse from header.
About ARM Register Bitfield Visualizer
A powerful tool for ARM embedded developers to visualize and manipulate register bitfields interactively. Perfect for debugging peripheral configurations on STM32, Cortex-M, and other ARM microcontrollers without needing an IDE or debugger.
Features:
- Visual 32-bit register representation
- Click individual bits to toggle them
- Parse register definitions from C header files (STM32 style)
- Manual bitfield entry with start/end bit positions
- Real-time hex, decimal, and binary value display
- Set register value from hex, decimal, or binary input
- Color-coded bitfield visualization
- Tooltips showing field names and descriptions
- Calculate masks and field values automatically
- Common ARM peripheral presets (RCC, GPIO, SCB, etc.)
- Copy values to clipboard
- Export/import register configurations
How to Use:
- Manual Entry: Add bitfields by specifying name, bit range, and description
- Parse Header: Paste register definitions from STM32 or CMSIS header files
- Presets: Load common ARM peripheral registers (STM32, Cortex-M)
- Click Bits: Click on any bit in the visualization to toggle it
- Set Value: Enter hex (0x1234), decimal (4660), or binary (0b...) to set register
Supported Header Formats:
#define REG_FIELD_Pos (16U)
#define REG_FIELD_Msk (0x1UL << REG_FIELD_Pos)
#define REG_FIELD REG_FIELD_MskCommon Use Cases:
- Debugging Peripherals: Visualize register configurations during development
- Learning ARM Architecture: Understand how bits map to hardware features
- Code Review: Verify register initialization values
- Documentation: Create visual register diagrams for documentation
- Quick Calculations: Calculate bitmasks and field values without IDE
- Hardware Bring-up: Test register configurations before writing to hardware
Tips:
- Copy register definitions directly from vendor header files (e.g., stm32f4xx.h)
- Use the preset library for common STM32 and Cortex-M registers
- Hover over bitfields to see detailed information
- Click individual bits for fine-grained control
- Use the "Set Value" feature to load register values from debugger