[RTEMS Project] #4577: arm/atsamv: UART loses receive characters when the system has a high interrupt load

[RTEMS trac]

#4577: arm/atsamv: UART loses receive characters when the system has a high
interrupt load
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 Reporter:  Christian Mauderer  |       Owner:  Christian Mauderer
     Type:  defect              |      Status:  closed
 Priority:  normal              |   Milestone:
Component:  bsps                |     Version:  5
 Severity:  normal              |  Resolution:  fixed
 Keywords:                      |  Blocked By:
 Blocking:                      |
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Changes (by Christian Mauderer <christian.mauderer@…>):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 In [changeset:"779847a5ef3eda256ddf05501153a484a8cea42e/rtems"
 779847a5/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="779847a5ef3eda256ddf05501153a484a8cea42e"
 bsp/atsam: Optionally use DMA for UART Rx

 If the system is busy with other interrupts and the UART is set to a
 fast baud rate, it's possible to loose UART interrupts and therefore
 characters. This allows to optionally enable a DMA for the UARTs so that
 a number of lost interrupts can be tolerated.

 The number of DMAs on this chip is limited and not not all applications
 need that feature. Therefore the DMA is disabled by default.

 Close #4577
 }}}

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Ticket URL: <http://devel.rtems.org/ticket/4577#comment:2>
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