Print an error when serial number is invalid (#691)
* Print error when serial number is invalid * Move to the first check, change end by return
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@ -11,6 +11,10 @@ HardwareSerial::HardwareSerial(int uart_nr) : _uart_nr(uart_nr), _uart(NULL) {}
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void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin)
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{
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if(0 > _uart_nr || _uart_nr > 2) {
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log_e("Serial number is invalid, please use 0, 1 or 2");
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return;
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}
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if(_uart) {
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end();
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}
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