Gustavo Enrique Jimenez schrieb:
Thank you for your answer. I played with different baud rates. The sender
delivers a stream of bytes. The faster a transmission rate is, the less
amount of data can be received. This leds me to two conclusions: At first,
there must be a queue for incoming data despite I ruled out a queue with an
inbuffer with the length 1. Secondly, a timeout error appeared, the sender
gave up. For now, I try to solve this problem with slower baud rates. Since
iopl is still not available to fpc in its 64-bit-version, I should move to c
for future port programming.
Despite queues an baud rates, you must expect data loss. You will
loss data in the physical layer. You have to implement some handshake
to prevent it. (using google translator, excuse my english).
Gustavo
Which can be done through a direct port access and some lines of code in
assembler language. The second idea I have is the use of the device
files /dev/ttySx, but how can these files be used to get access to all
of the registers of an uart?
Holger
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