>
>>Как это можно вылечить и почему так происходит?? может кто нить встречался,
>>а то у меня уже мозги кипят с этими платами...
>
>a flow-control как настроен, он то и должен придерживать передающую сторону при
>заполнении буфера. В данном случае flow-сontrol не должен иметь значеие,т.к. это fifo буфер, здесь получается что прерывание не успевает отрабатывать, есть параметр такой триггер левел но как его установить хз, написано что setserial это не может
Вот не эту тему:
The 16550A (or 16550) FIFO chip comes with 16 byte FIFO buffers. This means that it can receive up to 14 bytes (or send 16 bytes) before it has to interrupt the CPU. Not only can it wait for more bytes, but the CPU then can transfer all (14 to 16) bytes at a time. This is a significant advantage over the obsolete UARTs, which only had 1 byte buffers. The CPU receives less interrupts, and is free to do other things. Data is rarely lost. Note that the interrupt threshold of FIFO buffers (trigger level) may be set at less than 14. 1, 4 and 8 are other possible choices. As of late 2000 there was no way the Linux user could set these directly (setserial can't do it). While many PC's only have a 16550 with 16-byte buffers, better UARTS have even larger buffers.
Note that the interrupt is issued slightly before the buffer gets full (at say a "trigger level" of 14 bytes for a 16-byte buffer). This allows room for a couple more bytes to be received before the interrupt service routine is able to actually fetch all these bytes. The trigger level may be set to various permitted values by kernel software. A trigger level of 1 will be almost like an obsolete UART (except that it still has room for 15 more bytes after it issues the interrupt).
вот самое интересное:
Note that the interrupt threshold of FIFO buffers (trigger level) may be set at less than 14. 1, 4 and 8 are other possible choices. As of late 2000 there was no way the Linux user could set these directly (setserial can't do it). While many PC's only have a 16550 with 16-byte buffers, better UARTS have even larger buffers.
