[riot-notifications] [RIOT-OS/RIOT] drivers/periph/uart: add uart_write_byte() & uart_write_string() functions (#15499)

benpicco notifications at github.com
Mon Nov 23 19:13:25 CET 2020

### Contribution description

When implementing the serial bootloader feature, I added some UART convenience functions. 

 - `uart_write_byte()` to send a single byte over UART
 - `uart_write_string()` to send a string of text. This is especially useful for debugging with no stdio

Both are implemented as common fallback functions in `drivers/periph_common` but can be implemented by the CPU.
An implementation for sam0 is provided for `uart_write_byte()`.

### Testing procedure

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * drivers/uart: add convenience functions (write_byte, write_string)
  * cpu/sam0_common: uart: implement uart_write_byte()
  * cpu/sam0_common: uart: drop TX pin check on every write()

-- File Changes --

    M cpu/sam0_common/include/periph_cpu_common.h (7)
    M cpu/sam0_common/periph/uart.c (45)
    M drivers/include/periph/uart.h (25)
    A drivers/periph_common/uart.c (55)

-- Patch Links --


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