| ??? 08/02/09 22:53 Read: times |
#168086 - not sure whether FTDI translates to preferable at 921.6kBaud Responding to: ???'s previous message |
Hi,
I'm not sure whether FTDI directly translates to preferable at 921.6 kBaud. Sending more than a few kByte of data with hardware handshake at 921 kBaud to a PC running under Windows results in lost characters here. I'm very confident that the sending side (to the PC) immediately responds to RTS CTS handshake (verified with oscilloscope: there is no new start bit if the PC (as seen on FTDI handshake) is not ready). When transferring 1 MByte of data to the PC there is a high likelyhood that at least one char is lost (problem has been seen at transfer sizes of 8kByte and up but is less reproducable then (at 4kByte and below I haven't observed it)). Checked with several PCs (above 2 GHz), an OS (two Windows XP SP3 and one Win2k), three FTDI drivers (several versions including the latest), two applications (teraterm and a custom one), and relatively slow graphics (either some Intel IGP or a Matrox dual head - so handshake is being used). Greetings, Frieder PS: could the title "#168084 - someone a FAQ please" be changed to somewhat more meaningfull (so YourFavouriteSearchMachineGetsIt) ? |
| Topic | Author | Date |
| someone a FAQ please | 01/01/70 00:00 | |
| not sure whether FTDI translates to preferable at 921.6kBaud | 01/01/70 00:00 | |
| 921 kBaud to a PC running under Windows | 01/01/70 00:00 | |
| CTS latency | 01/01/70 00:00 | |
| Not just USB? | 01/01/70 00:00 | |
Hardware handshake | 01/01/70 00:00 | |
| Not convinced that HW is the (only) issue | 01/01/70 00:00 | |
| Example | 01/01/70 00:00 | |
| Poor quality | 01/01/70 00:00 | |
| Indeed | 01/01/70 00:00 | |
| hardware (firmware?) | 01/01/70 00:00 | |
| Is FAQ entry working yet? | 01/01/70 00:00 |