Wolfgang Walter <w...@stwm.de> wrote: > > > When we send 17 bytes with 150 baud, no parity, one stop bit then > > > we need to wait at least 17*10/150 seconds > 1000 ms > > > > Under Windows with both real COM-port and USB-serial cable this test takes > > no longer than 890 ms, usually it's even shorter like 875 ms. Testbot VMs > > also don't fail this test. If under Wine it takes > 1000 ms for you then > > probably there is a bug somewhere. > > How can that be? If you send 17 bytes which expands to 170 raw bits and you > only sent 150 bits/s? > > Maybe you are using a virtual machine or your com port does not support 150 > baud and chooses a different speed. Or you use a UART with a large buffer and > which already signals TX-EMPTY even if it is still sending from an internal > buffer. But one should not rely on that.
I'm testing under 64-bit Windows 7 on real hardware. -- Dmitry.
