Editing N900 Hardware Hacking
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{{ambox | {{ambox | ||
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- | |text=The serial port is NO RS232, it's a low-voltage direct UART IO <s>from OMAP SoC. It's specified for 1.8V (ONE dot 8) and</s> even 3.3V seem to destroy it. (the probed 2.7V you see in some pictures here ''are confirmed - yet to get investigated how this level shift gets accomplished'' <s>might be from error in probing procedure, I.E. having an implicit pullup on UART output by connecting other end of DMM to Vbat+ instead of GND, thus adding Vfwd of clamp diodes on top of the 1V8 nominal signal level</s>) | + | |text=The serial port is NO RS232, it's a low-voltage direct UART IO <s>from OMAP SoC. It's specified for 1.8V (ONE dot 8) and</s> even 3.3V seem to destroy it. (the probed 2.7V you see in some pictures here ''are confirmed - yet to get investigated how this level shift gets accomplished'' <s>might be from error in probing procedure, I.E. having an implicit pullup on UART output by connecting other end of DMM to Vbat+ instead of GND, thus adding Vfwd of clamp diodes on top of the 1V8 nominal signal level</s>) |
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J2000 | J2000 | ||
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pin 3 :: USB VBUS 5V | pin 3 :: USB VBUS 5V | ||
pin 4 :: <unknown> | pin 4 :: <unknown> | ||
- | pin 5 :: TX (confirmed by jacekowski ([[N900 Hardware Hacking/serial dump|115200 8-N-1]] ~2.6 V, connected to 1st UART in omap | + | pin 5 :: TX (confirmed by jacekowski ([[N900 Hardware Hacking/serial dump|115200 8-N-1]] ~2.6 V (NO, prolly ONE dot 8!!) , connected to 1st UART in omap - <code>/dev/ttyS0</code> in Linux), and r00t (see below)) |
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