Update battery documentation

docs/battery_boards/bat_board/bat_protocol.md

@@ -65,16 +65,38 @@ where:
 
 - DCDC_status_B:
 
-    Position | BIT[1] | BIT[0] |
-    |:---|:---:|:---:|
-    Value | PB1_restart | PB2_restart |
-    Description | Restart phase of the push button 1 | Restart phase of the push button 2 |
-    Possible status | Start-up phase(1)/stable operation(0) | Start-up phase/stable operation |
+    Position | BIT[3] | BIT[2] | BIT[1] | BIT[0] |
+    |:---|:---:|:---:|:---:|:---:|
+    Value | HSM_SW_F | HSM_HW_F | PB1_restart | PB2_restart |
+    Description | OC Fault on the HSM triggered by overcoming the MAX current defined in FW | OC Fault on the HSM triggered by FLT Pin on the HSM micro | Restart phase of the push button 1 | Restart phase of the push button 2 |
+    Possible status | FAULT_OFF(0)/FAULT_ON(1) | FAULT_OFF(0)/FAULT_ON(1) | Start-up phase(1)/stable operation(0) | Start-up phase/stable operation |
 
 - Final status shown at the port is equal to: 
 
     `(DCDC_status_B << 8 ) | DCDC_status_A`
 
+Therefore the end user will see a decimal number on the Display of the BAT, that can be translated in BITs and analyzed as defined by the tables above and summmed up here:
+
+```console
+
+**BIT_POS**:  15    14   13   12    11         10      9    8      7          6          5         4         3     2      1        0
+
+**VALUE**:    NAN  NAN  NAN  NAN  HSM_SW_F  HSM_HW_F  PB1  PB2  V12board  V12board_F  V12motor  V12motor_F  HSM  HSM_PG  HSM_F  HSM_broken
+
+E.g.
+
+If we get 172 as decimal value, then we will have in bits: 
+
+    0000 0000 1010 1100  
+
+meaning that we have on the bits related to:
+
+- HSM_PG
+- HSM
+- V12motor
+- V12board
+
+```
 
 ### Data displayed on the yarp port
 

docs/robot_power/robot_power_button.md

@@ -21,3 +21,15 @@ On iCub3 and on R1 there is also a display that shows the voltage and current pr
 |:---:|:---:|
 | <img src="../assets/fig-icub3-4.png" height="200"> | <img src="../assets/fig-r1-1.png" height="200"> |
 
+
+## Display Interface
+
+Lately has been released a new version of the Display UX/UI.
+The main screen is as described in the image below for both iCub3, ergoCub and R1:
+
+<img src="../assets/display-screen-131.png" width="500" height="500">
+
+
+Then, if a fault occurs the Display will switch to another screen descring the occurred fault by a string, which summarizes the error type, and the last values of voltage and currents accured at the moment of the fault as shown below (on the right hand side we have errors related to BOARDS/MOTORS line, instead on the left hand side errors related to CPU line):
+
+<img src="../assets/display-fault-screen-131.png" width="500" height="500">