Re: ISR16550
From: Zhang Zhiqun (zhangzhiqun_at_msn.com)
Date: 02/19/04
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Date: Thu, 19 Feb 2004 15:24:34 +0800
Which UART Chip do you use? Does it support FIFO?
-- ========================== Bula Cheung zhangzhiqun@msn.com "Bill T" <anonymous@discussions.microsoft.com> дÈëÓʼþ news:4EC61C81-D878-4830-8F53-5E57A45622B0@microsoft.com... > I have a proprietary X86 platform with 6 serial ports (2 on processor & an external QUART) that I am using with CE 4.2. When I use the normal com16550 serial device driver, all 6 ports work. But when I configure the registry and rebuild to use the high speed serial port driver (ISR16550), only the on-processor UARTS work properly - IO on the QUART ports cause the following message to be output "!!!SL_TxIntrEx: We found lost Xmit FIFO Data". > > Has anyone run into this? I know that the size of the RX/TX FIFOs for on-processor UARTs is 16 bytes while the size for the QUART is 64 but there may be other differences that cause the problem.
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