Semihosting is a mechanism for ARM targets to communicate input/output requests from application code to a host computer running a debugger. This mechanism could be used, for example, to enable functions in the C library, such as printf() and scanf(), to use the screen and keyboard of the host rather than having a screen and keyboard on the target system.
This is useful because development hardware often does not have all the input and output facilities of the final system. Semihosting enables the host computer to provide these facilities.
Semihosting is implemented by a set of defined software instructions (SVCs) that generate exceptions from program control. The application invokes the appropriate semihosting call and the debug agent then handles the exception. The debug agent provides the required communication with the host.
The semihosting interface is common across all debug agents provided by ARM Limited.
This is useful because development hardware often does not have all the input and output facilities of the final system. Semihosting enables the host computer to provide these facilities.
Semihosting is implemented by a set of defined software instructions (SVCs) that generate exceptions from program control. The application invokes the appropriate semihosting call and the debug agent then handles the exception. The debug agent provides the required communication with the host.
The semihosting interface is common across all debug agents provided by ARM Limited.
In this video tutorial we will show you how to enable and use Semihosting feature in CoIDE with CoLinkEx Debugger.
CoIde
CooCox is devoted to providing developers with a free/open and easy-to-use ARM Cortex-M0/M0+/M3/M4 development tool-chain, including CoLinkEx, a low-cost and hardware open debug adapter; CoIDE, an integrated development environment for developing based on code components like stacking up building blocks; and CoSmart, a graphical code generation tool.
Meanwhile, CooCox encourages users to share open source code components in CooCox community. By providing a series of open source software such as CoX, a unified standard peripheral library for ARM Cortex-M based microcontrollers; CoOS, a lightweight real-time operating system; and a number of drivers based on CoX, CooCox is committed to building an open-source and sharing community, and promoting the component-oriented development method.
Meanwhile, CooCox encourages users to share open source code components in CooCox community. By providing a series of open source software such as CoX, a unified standard peripheral library for ARM Cortex-M based microcontrollers; CoOS, a lightweight real-time operating system; and a number of drivers based on CoX, CooCox is committed to building an open-source and sharing community, and promoting the component-oriented development method.
CoLinkEx
CoLinkEx is a low-cost debug adapter for ARM Cortex-M based microcontrollers. It is hardware open, supports flash programming and online debugging under JTAG and SWD protocols, and works with CoIDE and CoFlash. It is an upgraded version of Colink(discontinued).
Note:
ColinkEx doesn't support all Cortex-M micro-controllers, so check the debugger page whether it is supported or not.
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