Replace call to serial stream with channel equivalent that has timeout

[josesimoes]

Description

• The calls to write and read to/from the serial channel where using a function without timeout.

Motivation and Context

• The existing code was causing the call to block when the buffer got full because there was no one at the other end to read it. The end result was that the watchdog was kicking in.
  When booting the device sends a ping to check if there is a debugger listening. When there is no answer the execution continues happily. If VS is running the system will get a reply to that ping and will set the flag CLR_EE_DBG_SET( Enabled ); .
  On any subsequent calls that are checked against that flags, like the CLR_EE_DBG_EVENT_BROADCAST their execution has to be timed risking blocking the execution because the debugger may go away for some reason or even that there is no debug session actually going on.
• Resolves Use of SPI APIs stops device deploy/debug after first execution Home#596.

How Has This Been Tested?

• SPI sample app from samples repo running on a STM32F429 disco. The app now continues execution with or without VS connected.

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: josesimoes [email protected]

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