From: "Navin Boppuri" <nboppuri@trinetcommunication.com>
To: <linuxppc-embedded@lists.linuxppc.org>
Subject: UART configuration problems
Date: Fri, 12 Jan 2001 19:06:00 +0100 [thread overview]
Message-ID: <003b01bfbc02$88afc3c0$4a1f76d8@washington> (raw)
Hello everyone,
I am trying to interface a MAX3100 uart to an SPI controller on the MPC823.
I have a functional SPI driver running. The transmit part of the UART works
just fine. I am able to transmit characters at 9600 8N1 baud. The problem
arises when I do a receive. The uart documentation says that the internal
fifo is 8 word long. But I notice that the FIFO is able to store only 8
characters. For example, if I transmit the characters
abcdefghijklmnopqrstuvwxyz
The uart shows only "yz" in its buffers. The other 24 characters are lost. I
noticed that 8 charaters are written in the buffer. It first writes
"abcdefgh" and then overwrites that with "ijklmnop" and so on. The uart
generates an irq interrupt whenever there is incoming data. I do not see why
the buffer is not big enough.
Can someone give me some insight into this problem? What do I need to do to
correct this?
Navin.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2001-01-12 18:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-12 18:06 Navin Boppuri [this message]
2001-01-13 2:30 ` UART configuration problems Ormund Williams
2001-01-15 12:11 ` Navin Boppuri
2001-01-15 21:13 ` Ormund Williams
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