[Bug 1915] New: Error in polling read USART on arm/at91

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1915

           Summary: Error in polling read USART on arm/at91
           Product: RTEMS
           Version: 4.10
          Platform: All
        OS/Version: RTEMS
            Status: NEW
          Severity: normal
          Priority: P3
         Component: libcpu
        AssignedTo: joel.sherrill at oarcorp.com
        ReportedBy: nopscmn at gmail.com


Created attachment 1330
  --> https://www.rtems.org/bugzilla/attachment.cgi?id=1330
Example patch

In function usart_read_polled from libcpu/arm/at91rm9200 used incorrect
registers and flags. From datasheet:

RXBUFF: Reception Buffer Full
0 = The signal Buffer Full from the Receive PDC channel is inactive.
1 = The signal Buffer Full from the Receive PDC channel is active.

must be:

RXRDY: Receiver Ready
0 = No complete character has been received since the last read of US_RHR or
the receiver is disabled. If characters were
being received when the receiver was disabled, RXRDY changes to 1 when the
receiver is enabled.
1 = At least one complete character has been received and US_RHR has not yet
been read.

and

US_THR - USART Transmit Holding Register
must be:
US_RHR - USART Receive Holding Register

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