embedded_printf.hpp File Reference

Lightweight printf implementation for ARM Cortex-M systems. More...

#include <cstdint>
#include <cstdarg>
#include <cstddef>
#include <sbl/common/defaults.hpp>

Include dependency graph for embedded_printf.hpp:

Go to the source code of this file.

Classes
class	sbl::core::util::EmbeddedPrintf
	Lightweight printf implementation for ARM Cortex-M systems. More...

Namespaces
namespace	sbl
	Root namespace for all Sound Byte Libs functionality.
namespace	sbl::core
namespace	sbl::core::util

Functions
int	sbl::core::util::embedded_vsnprintf (char *buffer, std::size_t size, const char *format, va_list args)
	Embedded printf functions.
int	sbl::core::util::embedded_snprintf (char *buffer, std::size_t size, const char *format,...)

Detailed Description

Lightweight printf implementation for ARM Cortex-M systems.

Minimal printf supporting only essential format specifiers:

• s - strings
• c - characters
  
• d - signed integers
• u - unsigned integers
• x - hex (lowercase)
• X - hex (uppercase)
• %% - literal %

Features:

• ~200-300 bytes instead of 962 bytes for full vfprintf
• No floating point support (can be added for Cortex-M4F with FPU)
• No width/precision/flags (keeps it simple)
• Fixed buffer size (no dynamic allocation)
• ISR-safe (no global state)

Usage: This is used automatically by the logging system when SBL_USE_EMBEDDED_PRINTF is defined. Otherwise, it falls back to system printf.

Definition in file embedded_printf.hpp.