fixed bugs in shutter; need to check its work and finish readme

F1:F103/shutter/Readme.md

@@ -26,11 +26,29 @@ You can find the device in `/dev/shutterX` (symlink to `/dev/ttyUSBX`).
 
 ## Commands
 
-* '0' - shutter CLO
-* '1' - shutter OPE
-* '2' - shutter HIZ
+###    debugging options:
+* '0' - shutter OPE
+* '1' - shutter CLO
+* '2' - shutter OFF
+* '3' - shutter HIZ
+* 'W' - test watchdog
+
+###    configuration:
+* '< n' - voltage on discharged capacitor (*100)
+* '> n' - voltage on fully charged capacitor (*100)
+* '# n' - duration of electrical pulse to open/close shutter (ms)
+* '$ n' - duration of mechanical work to completely open/close shutter (ms)
+* '* n' - shutter voltage multiplier
+* '/ n' - shutter voltage divider (V=Vadc*M/D)
+* 'c n' - open shutter when CCD ext level is n (0/1)
+* 'd' - dump current config
+* 'e' - erase flash storage
+* 'h n' - shutter is opened when hall level is n (0/1)
+* 's' - save configuration into flash
+
+###    common control:
 * 'A' - get raw ADC values
-* 'C' - close shutter  / abort exposition
+* 'C' - close shutter / abort exposition
 * 'E n' - expose for n milliseconds
 * 'O' - open shutter
 * 'R' - software reset
@@ -39,11 +57,11 @@ You can find the device in `/dev/shutterX` (symlink to `/dev/ttyUSBX`).
 * 'T' - get Tms
 * 'v' - get Vdd (/100V)
 * 'V' - get shutter voltage (/100V)
-* 'W' - test watchdog
+
 
 If you will enter wrong long message, will receive its echo back. Any wrong short command will show help list.
 
-### Shutter control
+## Shutter control
 Commands '0', '1' and '2' should be used only for debugging purposes.
 To open/close shutter use only 'O', 'C' and 'E' commands.
 
@@ -55,7 +73,7 @@ Command 'E' could return `OK`, `ERR` or `ERRNUM`/`I32OVERFLOW` in wrong number f
 When exposition starts you will receive message `OK` and `shutter=opened`. After its end you'll got `exptime=...`, `shutter=closed`.
 If shutter can't be closed, you will give a lots of "exp=cantclose" and different error messages until problem be solved. To stop this error messages give command 'O'.
 
-### Different commands
+## Different commands
 * 'A' will show raw values for all ADC channels: 0. - capacitor voltage, 1 - MCU temperature, 2 - MCU Vdd. You will give messages like `adcX=val`.
 
 * 't' - `mcut=val`, where val = T*10 degrC.
@@ -68,8 +86,27 @@ If shutter can't be closed, you will give a lots of "exp=cantclose" and differen
 
 * 'S' - several answers:
   * `shutter=`: `closed`, `opened`, `error`, `process`, `wait` or `exposing` - shutter state 
+  * `expfor=...` (only when exposing by command Exxx) - show given exposition time
   * `exptime=...` (only when shutter is opened) - show time since opening
   * `regstate=`: `open`, `close`, `off` or `hiZ` - TLE5205 outputs state
-  * `fbstate=`: `0` or `1` - TLE5205 FB out state (1 - error)
+  * `fbstate=`: `0` or `1` - TLE5205 FB out state (1 - error: insufficient voltage or shutter absent)
   * `hall=`: `0` or `1` - 1 for opened shutter, 0 for closed
   * `ccd=`: `0` or `1` - 1 for active (closed contacts) state of "CCD" input
+
+## Configuration
+All configuration stored in MCU flash memory, to dump current config just enter command 'd' and you will give an answer like
+```
+userconf_sz=16
+ccdactive=1
+hallactive=0
+minvoltage=400
+workvoltage=700
+shuttertime=20
+waitingtime=30
+shtrvmul=143
+shtrdiv=25
+```
+
+* ``
+* `ccdactive` - is level of 'CCD' input to open shutter (1 to open on high and 0 to open on low signal)
+* `hallactive`