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bitfield editor

SYSTEM ONLINE

32-BIT MEMORY MAP (Field Definition)HEX: 0x00000000

3124231615870

Field Creator (Bitfields)

Bits:to

MODE[3:0]

ENABLE[8:8]

PRESCALER[23:16]

Value Management

MODEMax: 15

Dec:Hex:0x0

ENABLEMax: 1

Dec:Hex:0x0

PRESCALERMax: 255

Dec:Hex:0x0

GENERATED C CODE (C-STRUCT & MACROS)

📖 How to use Bitfield Editor?

Bitfield Editor is a tool that facilitates mapping hardware registers (e.g., in STM32, ESP32 microcontrollers) to C language structures. It allows you to visually define which bits correspond to specific flags and automatically converts them into ready-to-use code.

1. Field Creator (Defining Masks)

Enter the field name (e.g., UART_EN).
Enter the bit range from the datasheet, e.g., from 12 to 15.
Click "Add". In the upper preview (Memory Map), these bits will be marked with a unique color.
The tool ensures that fields do not overlap.

2. Value Management (Calculator)

In the right column, enter the target value for a given field.
If the field has 4 bits (e.g., 12 to 15), the maximum value is 15 (0xF).
Changing the value on the fly recalculates the main Hex (register at the top), placing the bits in the correct place (Shift). It saves you from calculating in your head: val << 12.

3. Generating C Code

At the very bottom, clean C code is generated on the fly (so-called Bit-Fields). The script automatically detects memory "holes" between your fields and fills them with RESERVED_x variables, ensuring perfect alignment of the structure to the hardware register. Additionally, safe macros _Pos (Position) and _Msk (Mask) are generated, popular in CMSIS/HAL libraries.