Blog moved to https://anarsoul.github.io

The blog has moved to https://anarsoul.github.io

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Hacking on fingerprinting again or AES2550/AES2810 driver for libfprint

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Back in 2007 I participated in driver development for AuthenTec AES2501 scanner, driver was later merged into libfprint project. I didn't hack much on libfprint, just sent few bugfixes, but recently AuthenTec announced that they're willing to send fingerprint scanners for opensource enthusiasts who wants to develop driver for those scanners. So far, so good... I've wrote a letter to AuthenTec and they proposed to send AES2550 or AES2810 scanner to me. I chose AES2550. Actually, AES2550 and AES2810 are pretty same (AES2550 driver should work with AES2810), the only difference is missing crypto engine on AES2550 (who needs cryptography anyway? :)) So, I've got parcel with scanner in August, but unfortunately had no spare time for hacking, I only coded driver stub and read datasheet from AuthenTec. So, in September/October I've spent few (5-6?) nights hacking on this driver, and finally got it working on my AES2550. Image quality is much better then on my AE...
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rx3715

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Got Linux booting on my rx3715. Problem was in wrong serial port number. I thought that serial port brought to external connector is ttySAC0, but it's ttySAC1 on rx3715. Just changed some values in kernel config - and voila - it boots. Will try to get touch screen, buttons, udc and ASIC3 working a bit later. Btw, now I have serial cable for iPAQs and JTAG adapter (Olimex). So I hope debugging will be easier now. :)
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One step closer...

One more annoying issue was fixed tonight :) No more LCD flickering after resume! :) Problem was in timer1. rx1950 uses it somehow for clocking LCD (Don't know how :)). After booting from windows, linux reuse windows' timer settings, but these settings were lost after suspend/resume. Solution is simple: reconfigure timer1 in rx1950_lcd_power (some bits of TCON, TCFG0, TCFG1, regs TCNTB1, TCMPB1). Patch will be available as soon as embedded.net.ru get up :) One more hint: To get rid of 270 degrees screen rotation add following lines at the exports section  of /etc/init.d/opie: export QWS_DISPLAY=LinuxFb:Transformed export QWS_SIZE=240x320
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