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Print an error when serial number is invalid #691

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Oct 4, 2017
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4 changes: 4 additions & 0 deletions cores/esp32/HardwareSerial.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,10 @@ HardwareSerial::HardwareSerial(int uart_nr) : _uart_nr(uart_nr), _uart(NULL) {}

void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin)
{
if(0 > _uart_nr || _uart_nr > 2) {
log_e("Serial number is invalid, please use 0, 1 or 2");
return;
}
if(_uart) {
end();
}
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