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Retarget IO

A utility library to retarget the standard input/output (STDIO) messages to a UART port. With this library, you can directly print messages on a UART terminal using printf().

What's Included?

  • printf() support over a UART terminal
  • Support for GCC, IAR, and ARM toolchains
  • Thread safe write for NewLib
  • Optional PDL-only support

What Changed?

v1.7.0

  • Added support for MTB HAL API version 3.
  • UART peripheral to be set up and initilalized as a prerquisite for using the retarget-io library.
  • cy_retarget_io_init function signature change. Init function needs a pre-initialized HAL UART object as input parameter.
  • cy_retarget_io_init_fc function removed.
  • Stopped exposing the HAL UART object.

v1.6.0

  • Added support for PDL-only. When COMPONENT_MTB_HAL or CY_USING_HAL is not defined, only the PDL will be used to support printf() functionality.
  • Changed declaration of putc override for ARM compiler to align with latest ARM guidance.

v1.5.0

  • Add a new macro CY_RETARGET_IO_NO_FLOAT. When defined, floating point string formatting support will be disabled, allowing for flash savings in applications which do not need this functionality.

v1.4.0

  • Add cy_retarget_io_init_fc function to initialize with flow control pins
  • Mark mutex as no longer initialized after 'cy_retarget_io_deinit'

v1.3.0

  • Added support for checking whether data is being transmitted and waiting until done before finishing the deinit process
  • Added support for using with HAL v1 or v2

v1.2.0

  • Improve error handling
  • Add de-initialization of the mutex to cy_retarget_io_deinit
  • Update documentation for integration of the library in a RTOS environment.

v1.1.1

  • Minor update for documentation & branding

v1.1.0

  • Implemented system I/O retarget functions specific to ARM Compiler 6.
  • Made _write implementation thread-safe for Newlib.

v1.0.0

  • Initial release

Supported Software and Tools

This version of the Retarget IO was validated for compatibility with the following Software and Tools:

Software and Tools Version
ModusToolbox™ Software Environment 3.0.0
GCC Compiler 10.3.1
IAR Compiler 9.40.2
ARM Compiler 6 6.16

Minimum required ModusToolbox™ Software Environment: v2.0

More information

© Cypress Semiconductor Corporation (an Infineon company) or an affiliate of Cypress Semiconductor Corporation, 2019-2023.