Date: Fri, 19 Aug 2005 20:44:53 -0700 (PDT) From: User Tomdean <tomdean@speakeasy.org> To: freebsd-usb@freebsd.org Subject: Interfacing FT245BM With Ucom Message-ID: <200508200344.j7K3irmQ021004@asus.tddhome>
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I am running FreeBSD 5.4, GENERIC. I have a UMP2 module based on the FTDI FT8U245BM chip, a USB to parallel chip. The module in intended to interface processors like the AVR or 68HC1x to the USB. I am using the FTDI ATmega16, clocked at 16 mHz. My project will have 3 or 3 bytes put into the USB every 6.0 to 7.8 uSec or every 11.2 to 12.8 uSec, depending on the degradation of precision due to over-clocking the ATMega16 ADC. Most of the data flow is into FreeBSD. So, I need about 0.75 mBytes thruput. Maybe a few bytes per second out of FreeBSD. The UMP2 is recognized as a ucom device, vendor 0x0403 product 0x6001 release 0x0200 If I 'kldload uftdi', I get uftdi.ko and ucom.ko loaded. Then, powering up the UMP2 results in the device being connected. From dmesg: ucom0: FTDI USB HS Serial Converter, rev 1.10/2.00, addr 2 I can connect to the device with tip. But, I cannot disconnect! '~.' displays [EOT] but tip does not exit. I can disconnect as root! The device is crw-rw---- 1 uucp dialer 232, 128 Aug 18 04:43 ucom0 When tip is hung, # ps ... 1001 17030 553 0 6 0 1272 728 ttywai IE+ p1 0:00.00 /usr/bin/tip ucom 1001 17031 17030 0 -84 0 0 0 - Z+ p1 0:00.00 <defunct> ... I have to cycle power on the UMP2 to get tip to exit! And, cycle power on the UMP2 to get it recognized again!. Sometimes, it takes several minutes before one of the drivers gets in sync with the hardware. BTW, the behavior of tip has changed from a UNIX-style 0x0a to a WINDOZE style 0x0d,0x0a to get UNIX display behavior! I plan to try tip with ucom0 with an echo process in the AVR to just return any char received by the UMP2. Can I get the 0.75 mByte thruput with uftdi driver, accessed thru ucom? tomdean
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