Disable USART IRQ in uart_write and uart_debug_write

[benwaffle]

This PR fixes issues #494 and #467 for printf();

I want to be able to use printf() with Serial.write() and Serial.read(). See discussion in both issues mentioned above.

Validation

See the example code in #494

---

I'm not sure how to:

• Get IRQn_Type values from a UART_TypeDef
• Determine which UARTs are defined for a given device
• Whether I need to set the priority when enabling the interrupt

[fpistm]

Hi @benwaffle
Thanks for the PR.
Could you squash some commits to clean the PR?

Those can be merged in one:

Disable uart interrupt in uart_debug_write
redundant
remove broken/unneeded code

And those one:

Fix UART error callback (clear flags and restart receive IT)
fix astyle

Then the PR should contains only 3 commits:

Disable uart interrupt in uart_debug_write
Fix serial port full-duplex bug
Fix UART error callback (clear flags and restart receive IT)

Thanks in advance

[benwaffle]

@fpistm squashed

[fpistm]

Thanks a lot @benwaffle. I will rview and test it as soon as possible.

[fpistm]

@benwaffle
using your code example, I only receive and print one time?
Is this really fix your issue ?

[benwaffle]

yes, it worked for me. make sure that you have the Disable uart interrupt in uart_debug_write patch applied

[fpistm]

I got it but it is not functional on my side.

[benwaffle]

I can test it again today.

[fpistm]

Ok, in fact it fails with Arduino Serial monitor.
Using Putty terminal, it works.
Anyway, I need deeper review/tests.

[fpistm]

@benwaffle, @ppescher ,
I've made some test and dig into the code.
The result is the #502 .
Please could you review and test it?

[fpistm]

This one is superseded by #502