From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Ling Su" To: Subject: [ECOS] Serial Port Question.(Help needed!) Date: Sat, 20 Jan 2001 11:42:00 -0000 Message-id: <001301c08319$2913abf0$0201a8c0@raccoon> X-SW-Source: 2001-01/msg00354.html Dear All, Recently I have met some problem with the serial port driver on NEC VRC4373. I use serial 0 for GDB debugging, and serial port 1 for communication with PC. In the testing stage, it works well. When I do some intensive work, the serial port 1 will easily got stucked. I found it is due to the PC writes to this port while the applicaiton on board trying to send something back. Looks like some conflicts happened. Is this a reasonable guess? I check the vrc4373 board document, I found the RTS/CTS signals are not connected, so hardware flow control is not allowed. I wonder if software flow control can solve this problem, since it is not caused by buffer overflow. Based on above assumption, I thought if I can switch serial port 0 and serial port 1, and turn on hardware flow control for serial port 0, it could be working. But I am not sure if GDB stub can work on a serial port 1 which has no hardware flow control, anybody can kindly shed me some light on this? Since when I run the eCosconfig windows tools, I found the hardware flow control for serial port is greyed, I wonder if the hardware flow control can be turned on without modifying the serial driver for Z85c30. Can I forced to enable the hardware flow control directly? Thanks for any kindly assistances! Rgds, -Ling (BTW, I have sent two emails regarding to vrc4373 and vrc4375, unfortunately got no reply till now, anyone has this experience, please let me know. Right now I am working on a platform which is obselete, I don't know if I should transfter to another platform. Of course, I will try to port eCos on vrc4375 in current stage. Any helpful inputs can speeds up this work, I guess. :))