UART Logger destination

[stephenhensley]

Using UART to print/debug is pretty common, and it makes sense for it to integrate with the existing Logger API.

This can already be DIY'd fairly easily, but this improves the convenience of working with typical printf variadic syntax, and makes it easy to switch from USB to a UART pin without having to refactor application code much.

Because there are many UART pins, there is an additional configuration step required.

As an example:

using Log = daisy::Logger<daisy::LOGGER_UART>;
...
int main(void) {
  // Set the hardware details (this method is only available to the UART logger destination.
  Log::Configure({daisy::UartHandler::Config::Peripheral::UART_7,
                  daisy::sprout::Hardware::kPinStLinkUartTx, 115200});
  
  // Then you can use as usual:
  Log::StartLog(false);


  while(1) {
    Log::PrintLine("Time since boot: %d ms", daisy::System::GetNow());
    daisy::System::Delay(1000);
  }
}

I am looking into getting the wait_for_pc stuff to work as expected, but so far it seems like the transmissions are successful whether a device is present or not.

[github-actions]

Test Results

167 tests  ±0   167 ✅ ±0   0s ⏱️ ±0s
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  1 files   ±0     0 ❌ ±0 

Results for commit 7fa9025. ± Comparison against base commit 08f2965.

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