SerialX.begin - support 7 bit modes. #391
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As per the forum thread: https://forum.arduino.cc/t/uno-r4-and-serial1-different-nr-databits/1192974/9 Sketches that tried to use the standard modes such as Serial_7E1 Would not work and sounds like they would hang. This sketch simply duplicated the 8 bit modes, in the switch statement, and changed _8 to _7... So for example: ``` case SERIAL_7E1: uart_cfg.data_bits = UART_DATA_BITS_7; uart_cfg.parity = UART_PARITY_EVEN; uart_cfg.stop_bits = UART_STOP_BITS_1; break; ``` There was already support for handling this in the FSP layer. I verified that 7E1 and 7O1 worked using logic analyzer. Also verified that the standard 8N1 still worked. Note: The ArduinoCore-API file HardwareSerial.h has many other defined modes, which are probably not supported, on the UNO R4, such as: SERIAL_5E2 Which the switch statement still does not handle, and the uart_cfg items will not be set... But that is beyond this fix.
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As per the forum thread:
https://forum.arduino.cc/t/uno-r4-and-serial1-different-nr-databits/1192974/9
Sketches that tried to use the standard modes such as Serial_7E1 Would not work and sounds like they would hang.
This sketch simply duplicated the 8 bit modes, in the switch statement, and changed _8 to _7... So for example:
There was already support for handling this in the FSP layer. I verified that 7E1 and 7O1 worked using logic analyzer. Also verified that the standard 8N1 still worked.
Note: The ArduinoCore-API file HardwareSerial.h has many other defined modes, which are probably
not supported, on the UNO R4, such as: SERIAL_5E2
Which the switch statement still does not handle, and the uart_cfg items will not be set... But that is beyond this fix.