Data Rate supported by QNX neutrino on serial port
20/01/2017 10:46
Hi all, Please help me out ..

i want to know the data rate supported by QNX netrino 6.0 version onserial port. I heared that i will support maximum of 115 kbps..

if suppose want increase it, what we have to do ...

Please help me ..

i have seen poor responce for previous thread that i posted .

RegardsSuresh

Source is Usenet: comp.os.qnx
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Answer score: 5
20/01/2017 10:46 - hi david, in my project, Hardware used include USART which can support daud rate maximum of 921.6kpbs, but Neutrino OS has limitation to read more than 115.2 kpbs. i dont no what the reason..

Please do needfull thing Thank u for ReplingSuresh

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20/01/2017 10:46 - AFAIK the maximum data rate is not a function of the OS, but rather ofthe UART on your board.

a typical 16550 will only do 115K2baud, but newr ones can go faster. Icant remember the type, but a previous project I worked on ran at230K4baun from serial port.

The uart speed is usually selected by a baudrate divisor somewhere inthe lower levels of initialisation.

hthDave

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20/01/2017 10:46 - <snip stuff about how It doesnt work boo hoo> What have you tried to make this asumption? Without knowing the actual USART I can do no more than guess: I guess that you are using the standard devc-ser8250 driver. this doesonly support 115k2 as far as I can tell. This driver is designed for8250/16550 uarts, which only go this fast (might be wrong here, itsbeen a while since I looked at the specs).

You probably need the correct driver for you USART, and if this is nota std one you will either have to write it, or find someone who canwrite it. If it is a std driver then if it does not support therequired data rate you could report this as a support issue to QNX andask them to sort it out? Dave

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