On Tue, Jul 13, 2010 at 06:25:23PM +0600, Alexey Goncharov wrote:
I wonder if the port is using the irq or polling? I seem to recall
seeing really bad serial performance when the irq wasn't setup right once.
Here is an excerpt from 8250 driver debug log:
serial8250_interrupt(28)...status = 61...end.
THRE...serial8250_interrupt(28)...status = 61...end.
status = 60...THRE...serial8250_interrupt(28)...status = 60...end.
serial8250_interrupt(28)...status = 61...end.
status = 61 <--- 0x61 - a value that is stored in UnLSR (UART Line
Status Register). UnLSR register description can be found in LPC2468
user manual rev. 4 ( http://www.nxp.com/documents/data_sheet/LPC2468.pdf
) on page 432. Below is a part of it:
0x61 = 0110 0001
|| |
|| +-----> Overrun Error
|+-----------> Transmitter Holding Register Empty (THRE)
+------------> Transmitter Empty (TEMT)
So.. how should i treat UARTs to except this kind of overruns? I send no
more than 16 bytes every 80-100 ms and it tells me "overrun".
Thank you for your time
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