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Rock solid UART ISR for LPC1343?

Question asked by Juergen Marquardt on Sep 7, 2017
Latest reply on Sep 11, 2017 by jeremyzhou

Trying to build a 'rock solid' uart Interrupt service routine ('UART_IRQHandler()') for LPC1343.
Should be able to synchronize to a running serial stream which has data packets separated by 100 msec gaps between them.
Some sentences in Manual UM10375 are not clear enough for me.

Example 1:
Uart IIR on page188: "The UART RLS set whenever any one of four error conditions occur..."
Referenced are OE, PE, FE and BI. What about RXFE? When RXFE will be set?

Example 2:
PE in U0LSR on page 194: "Time of parity error detection is dependent of U0FCR[0]: What does that mean?
Will I get PE when error char is loaded from RSR into FIFO? Or will I get PE if I read a char from the FIFO?

FE description is - at first sight - more exact: "A framing error is associated with the character at the top of the UART RBR FIFO". If FIFO is enabled, do we then have an 'array RBR[16]'?

Maybe one has solved such and may provide hints for handling LPC1343 in ISR?
Best regrards Juergen