Dodajem knjige

2026-05-29 00:39:46 +02:00
parent 34af1ebdc7
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+Mouse Hardware
+by Tomi Engdahl
+        Serial mouse
+ 
+Voltage levels:
+Mouse takes standard RS-232C output signals (+-12V) as its input signals.
+Those outputs are in +12V when mouse is operated. Mouse takes some current
+>from each of the RS-232C port output lines it is connected (about 10mA).
+Mouse send data to computer in levels that RS-232C receiver chip in the 
+computer can uderstand as RS-232C input levels. Mouse outputs are normally
+something like +-5V, 0..5V or sometimes +-12V. Mouse electronics
+normally use +5V voltage.
+ 
+ 
+        Microsoft serial mouse
+ 
+Pins used:
+TD, RTS and DTR are used only as power source for the mouse.
+RD is used to receive data from mouse.
+ 
+Serial data parameters: 1200bps, 7 databits, 1 stop-bit
+ 
+Data packet format: 
+Data packet is 3 byte packet. It is send to the computer every time
+mouse state changes (mouse moves or keys are pressed/released).
+ 
+        D7      D6      D5      D4      D3      D2      D1      D0
+ 
+1.      X       1       LB      RB      Y7      Y6      X7      X6
+2.      X       0       X5      X4      X3      X2      X1      X0      
+3.      X       0       Y5      Y4      Y3      Y2      Y1      Y0
+ 
+The byte marked with 1. is send first, then the others. The bit D6
+in the first byte is used for syncronizing the software to mouse
+packets if it goes out of sync.
+ 
+LB is the state of the left button (0 means pressed down)
+RB is the state of the right button (0 means pressed down)
+X7-X0 movement in X direction since last packet (signed byte)
+Y7-Y0 movement in Y direction since last packet (signed byte)
+ 
+ 
+        Mouse systems mouse            
+ 
+Serial data parameters: 1200bps, 8 databits, 1 stop-bit
+ 
+The data is sent in 5 byte packets in following format:
+ 
+        D7      D6      D5      D4      D3      D2      D1      D0
+ 
+1.      1       0       0       0       0       LB      CB      RB
+2.      X7      X6      X5      X4      X3      X2      X1      X0
+3.      Y7      Y6      Y5      Y4      Y3      Y4      Y1      Y0
+4.      
+5.
+ 
+LB is left button state (0=pressed, 1=released)
+CB is center button state (0=pressed, 1=released)
+RB is right button state (0=pressed, 1=released)
+X7-X0 movement in X direction since last packet in signed byte 
+      format (-128..+127), positive direction right
+Y7-Y0 movement in Y direction since last packet in signed byte 
+      format (-128..+127), positive direction up
+ 
+The last two bytes in the packet (bytes 4 and 5) contains
+information about movement data send in last packet. I have not
+found exact information about those bytes. I have not also found
+any use for such a information (maybe it is for syncronization 
+or something like that).