Thanks but i'ts not crucial for my use. 9600 bauds is enough. It's just for sending commands to RedBoot.
Guillaume MENANT -----Message d'origine----- De : Gary Thomas [mailto:[EMAIL PROTECTED] Envoyé : vendredi 12 janvier 2007 13:14 À : Guillaume Menant Cc : [EMAIL PROTECTED] Objet : Re: [ECOS] RE : [ECOS] RE : [ECOS] Serial link problems Guillaume Menant wrote: > I've resolved the problem by setting the baudrate to 9600 (a lower one) Note: as Andrew pointed out, this problem is created by the fact that RedBoot is a polled driver and your host may be sending characters faster than it can handle them. You might be able to get by with a faster speed, e.g. 19200. You also might look at how your serial driver handles [polled] timeouts. RedBoot has a timeout mechanism which is only applied on the first character of the command line. If your serial driver's timeout support is poor (in your HAL - I can't examine it), then this might also cause problems. > > Thanks for your support. > > Guillaume MENANT > > -----Message d'origine----- > De : [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] De la part de Guillaume > Menant > Envoyé : vendredi 12 janvier 2007 09:58 > À : [EMAIL PROTECTED] > Objet : [ECOS] RE : [ECOS] Serial link problems > > Thanks for your answer Gary. > > I've understand the same thing but isn't it a driver problem? I'm currently > working at 38400 bauds no parity, no handshake 8 databits 1 stopbit. Like > you suggest, I will try at a lower baudrate like 9600 for example. > > I will give you some news when I tried this. > > Guillaume MENANT > > -----Message d'origine----- > De : [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] De la part de Gary Thomas > Envoyé : jeudi 11 janvier 2007 12:11 > À : Guillaume Menant > Cc : [EMAIL PROTECTED] > Objet : Re: [ECOS] Serial link problems > > Guillaume Menant wrote: >> Hello, >> >> While using RedBoot on AT697 (LEON Sparc V8), I've encountered problems >> using the serial link. It appears that the "_rb_gets_preloaded" function >> miss few characters arriving on the serial link. For example, I send > "help" >> and RedBoot understands "hlp". >> >> I've tried to send this command with 2 different softwares: >> >> - The first one send the 4 ascii characters one after the other followed > by >> the carriage return -> RedBoot don't understand the command every time. >> - The second one sends each character as soon as the user hit a key on the >> keyboard (it's hyperterminal, included in windows XP) -> RedBoot > understand >> the command every time. >> >> What can I do to resolve this problem? Obviously, it comes from the serial >> driver included in RedBoot (in io.c), but what kind of modification have I >> to do to prevent it? > > What you're seeing is a serial overflow, caused when characters > come into RedBoot too quickly. Your first case, all four characters > will be sent back to back, in the second, they'll only be sent as > fast as the person typing them. > > Either run at a slower baud rate, or go with the one-character-at-a-time > style of input. > -- ------------------------------------------------------------ Gary Thomas | Consulting for the MLB Associates | Embedded world ------------------------------------------------------------ -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
