diff --git a/documentation/app_class_diagram.mdj b/documentation/app_class_diagram.mdj
index 0d86b20..08fc44d 100644
--- a/documentation/app_class_diagram.mdj
+++ b/documentation/app_class_diagram.mdj
@@ -521,13 +521,47 @@
 											"height": 13,
 											"text": "-error: unsigned char",
 											"horizontalAlignment": 0
+										},
+										{
+											"_type": "UMLAttributeView",
+											"_id": "AAAAAAFpKn3/Fi1cGQI=",
+											"_parent": {
+												"$ref": "AAAAAAFpHq11g76wgf4="
+											},
+											"model": {
+												"$ref": "AAAAAAFpKn3+5y1ZFXA="
+											},
+											"font": "Arial;13;0",
+											"left": 221,
+											"top": 819,
+											"width": 523.16748046875,
+											"height": 13,
+											"text": "-displayInverted: boolean",
+											"horizontalAlignment": 0
+										},
+										{
+											"_type": "UMLAttributeView",
+											"_id": "AAAAAAFpKn8jWi35UTU=",
+											"_parent": {
+												"$ref": "AAAAAAFpHq11g76wgf4="
+											},
+											"model": {
+												"$ref": "AAAAAAFpKn8jMS32ETQ="
+											},
+											"font": "Arial;13;0",
+											"left": 221,
+											"top": 834,
+											"width": 523.16748046875,
+											"height": 13,
+											"text": "-displayDimmed: boolean",
+											"horizontalAlignment": 0
 										}
 									],
 									"font": "Arial;13;0",
 									"left": 216,
 									"top": 769,
 									"width": 533.16748046875,
-									"height": 53
+									"height": 83
 								},
 								{
 									"_type": "UMLOperationCompartmentView",
@@ -550,7 +584,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 827,
+											"top": 857,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "#ScreenManager(&display: Adafruit_SSD1306)",
@@ -567,7 +601,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 842,
+											"top": 872,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "+addView(*logic_function: boolean, *pData: void, UID: const unsigned char): boolean",
@@ -584,7 +618,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 857,
+											"top": 887,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "+removeView(UID: const unsigned char): boolean",
@@ -601,10 +635,10 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 872,
+											"top": 902,
 											"width": 523.16748046875,
 											"height": 13,
-											"text": "+displayView(UID: const unsigned char): boolean",
+											"text": "+displayView(UID: const char = -1): boolean",
 											"horizontalAlignment": 0
 										},
 										{
@@ -618,7 +652,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 887,
+											"top": 917,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "+invertDisplay(inverted: boolean): void",
@@ -635,7 +669,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 902,
+											"top": 932,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "+dimDisplay(dimmed: boolean): void",
@@ -652,7 +686,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 917,
+											"top": 947,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "-createEmptyList(): void *",
@@ -669,12 +703,46 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 932,
+											"top": 962,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "+const getError(): unsigned char",
 											"horizontalAlignment": 0
 										},
+										{
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+											"_id": "AAAAAAFpKn+bfS6WhrY=",
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+											"left": 221,
+											"top": 977,
+											"width": 523.16748046875,
+											"height": 13,
+											"text": "+const isDisplayInverted(): boolean",
+											"horizontalAlignment": 0
+										},
+										{
+											"_type": "UMLOperationView",
+											"_id": "AAAAAAFpKoAX6y9xyG0=",
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+											"left": 221,
+											"top": 992,
+											"width": 523.16748046875,
+											"height": 13,
+											"text": "+const isDisplayDimmed(): boolean",
+											"horizontalAlignment": 0
+										},
 										{
 											"_type": "UMLOperationView",
 											"_id": "AAAAAAFpIV356hs9rsQ=",
@@ -686,7 +754,7 @@
 											},
 											"font": "Arial;13;0",
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-											"top": 947,
+											"top": 1007,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "-addNewLinkAtTheEnd(ViewLinkedList *viewLinkedList, ViewLink viewLink): boolean",
@@ -703,7 +771,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 962,
+											"top": 1022,
 											"width": 523.16748046875,
 											"height": 13,
 											"text": "-isListEmpty(ViewLinkedList viewLinkedList): boolean",
@@ -720,7 +788,7 @@
 											},
 											"font": "Arial;13;0",
 											"left": 221,
-											"top": 977,
+											"top": 1037,
 											"width": 523.16748046875,
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 											"text": "-removeLinkByUID(ViewLinkedList *viewLinkedList, UID: const unsigned char): boolean",
@@ -729,9 +797,9 @@
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 									"font": "Arial;13;0",
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@@ -809,8 +877,8 @@
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+									"left": 814,
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@@ -830,8 +898,8 @@
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@@ -851,8 +919,8 @@
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@@ -872,8 +940,8 @@
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+									"left": 853,
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@@ -893,8 +961,8 @@
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@@ -914,8 +982,8 @@
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+									"left": 856,
+									"top": 868,
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@@ -934,8 +1002,8 @@
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 									"font": "Arial;13;0",
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+									"left": 759,
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@@ -956,8 +1024,8 @@
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 									"font": "Arial;13;0",
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+									"left": 778,
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 									"alpha": -0.7853981633974483,
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@@ -977,7 +1045,7 @@
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@@ -1022,7 +1090,7 @@
 								"$ref": "AAAAAAFpHqCuVb5uVUA="
 							},
 							"lineStyle": 1,
-							"points": "879:873;749:872",
+							"points": "879:886;749:890",
 							"showVisibility": true,
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@@ -3445,8 +3513,8 @@
 											},
 											"visible": false,
 											"font": "Arial;13;0",
-											"left": -80,
-											"top": 112,
+											"left": -32,
+											"top": 224,
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@@ -3456,8 +3524,8 @@
 												"$ref": "AAAAAAFpIVCNABPYowM="
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 											"font": "Arial;13;1",
-											"left": 381,
-											"top": 1055,
+											"left": 405,
+											"top": 1111,
 											"width": 153.55615234375,
 											"height": 13,
 											"text": "ViewLinkedList"
@@ -3470,8 +3538,8 @@
 											},
 											"visible": false,
 											"font": "Arial;13;0",
-											"left": -80,
-											"top": 112,
+											"left": -32,
+											"top": 224,
 											"width": 73.67724609375,
 											"height": 13,
 											"text": "(from Model)"
@@ -3484,15 +3552,15 @@
 											},
 											"visible": false,
 											"font": "Arial;13;0",
-											"left": -80,
-											"top": 112,
+											"left": -32,
+											"top": 224,
 											"height": 13,
 											"horizontalAlignment": 1
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 									],
 									"font": "Arial;13;0",
-									"left": 376,
-									"top": 1048,
+									"left": 400,
+									"top": 1104,
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 									"stereotypeLabel": {
@@ -3528,8 +3596,8 @@
 												"$ref": "AAAAAAFpIVFv0xYYyKo="
 											},
 											"font": "Arial;13;0",
-											"left": 381,
-											"top": 1078,
+											"left": 405,
+											"top": 1134,
 											"width": 153.55615234375,
 											"height": 13,
 											"text": "+*pData: void",
@@ -3545,8 +3613,8 @@
 												"$ref": "AAAAAAFpIVHZcha1vLw="
 											},
 											"font": "Arial;13;0",
-											"left": 381,
-											"top": 1093,
+											"left": 405,
+											"top": 1149,
 											"width": 153.55615234375,
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 											"text": "+*logic_function: boolean",
@@ -3562,8 +3630,8 @@
 												"$ref": "AAAAAAFpIVKy4BfqLR4="
 											},
 											"font": "Arial;13;0",
-											"left": 381,
-											"top": 1108,
+											"left": 405,
+											"top": 1164,
 											"width": 153.55615234375,
 											"height": 13,
 											"text": "+UID: const unsigned char",
@@ -3579,8 +3647,8 @@
 												"$ref": "AAAAAAFpIVL7ehiHAoI="
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 											"font": "Arial;13;0",
-											"left": 381,
-											"top": 1123,
+											"left": 405,
+											"top": 1179,
 											"width": 153.55615234375,
 											"height": 13,
 											"text": "+next: ViewLink*",
@@ -3588,8 +3656,8 @@
 										}
 									],
 									"font": "Arial;13;0",
-									"left": 376,
-									"top": 1073,
+									"left": 400,
+									"top": 1129,
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@@ -3603,8 +3671,8 @@
 										"$ref": "AAAAAAFpIVCM/xPV/bU="
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 									"font": "Arial;13;0",
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@@ -3619,8 +3687,8 @@
 									},
 									"visible": false,
 									"font": "Arial;13;0",
-									"left": -40,
-									"top": 56,
+									"left": -16,
+									"top": 112,
 									"width": 10,
 									"height": 10
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@@ -3635,16 +3703,16 @@
 									},
 									"visible": false,
 									"font": "Arial;13;0",
-									"left": -40,
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+									"left": -16,
+									"top": 112,
 									"width": 10,
 									"height": 10
 								}
 							],
 							"font": "Arial;13;0",
 							"containerChangeable": true,
-							"left": 376,
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+							"left": 400,
+							"top": 1104,
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 							"height": 133,
 							"nameCompartment": {
@@ -3684,8 +3752,8 @@
 									},
 									"visible": false,
 									"font": "Arial;13;0",
-									"left": 480,
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@@ -3705,8 +3773,8 @@
 									},
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@@ -3726,8 +3794,8 @@
 									},
 									"visible": false,
 									"font": "Arial;13;0",
-									"left": 451,
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@@ -3747,8 +3815,8 @@
 									},
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 									"font": "Arial;13;0",
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@@ -3768,8 +3836,8 @@
 									},
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 									"font": "Arial;13;0",
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@@ -3789,8 +3857,8 @@
 									},
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@@ -3810,8 +3878,8 @@
 									},
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@@ -3830,8 +3898,8 @@
 									},
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 									"font": "Arial;13;0",
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@@ -3850,8 +3918,8 @@
 									},
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 									"font": "Arial;13;0",
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+									"left": 468,
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@@ -3896,7 +3964,7 @@
 								"$ref": "AAAAAAFpHq11gr6quCs="
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@@ -3931,6 +3999,182 @@
 							"headQualifiersCompartment": {
 								"$ref": "AAAAAAFpIVDGIRTDqEk="
 							}
+						},
+						{
+							"_type": "UMLClassView",
+							"_id": "AAAAAAFpKneDch8OUuM=",
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+								"$ref": "AAAAAAFF+qBtyKM79qY="
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+									"_parent": {
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+											"font": "Arial;13;0",
+											"left": -144,
+											"top": -112,
+											"height": 13,
+											"horizontalAlignment": 1
+										}
+									],
+									"font": "Arial;13;0",
+									"left": 880,
+									"top": 1040,
+									"width": 217,
+									"height": 25,
+									"stereotypeLabel": {
+										"$ref": "AAAAAAFpKneDcx8QPkU="
+									},
+									"nameLabel": {
+										"$ref": "AAAAAAFpKneDcx8Re7o="
+									},
+									"namespaceLabel": {
+										"$ref": "AAAAAAFpKneDcx8SCYg="
+									},
+									"propertyLabel": {
+										"$ref": "AAAAAAFpKneDcx8Tg7I="
+									}
+								},
+								{
+									"_type": "UMLAttributeCompartmentView",
+									"_id": "AAAAAAFpKneDcx8URfg=",
+									"_parent": {
+										"$ref": "AAAAAAFpKneDch8OUuM="
+									},
+									"model": {
+										"$ref": "AAAAAAFpKneDcR8MzCI="
+									},
+									"font": "Arial;13;0",
+									"left": 880,
+									"top": 1065,
+									"width": 217,
+									"height": 10
+								},
+								{
+									"_type": "UMLOperationCompartmentView",
+									"_id": "AAAAAAFpKneDcx8Vby4=",
+									"_parent": {
+										"$ref": "AAAAAAFpKneDch8OUuM="
+									},
+									"model": {
+										"$ref": "AAAAAAFpKneDcR8MzCI="
+									},
+									"font": "Arial;13;0",
+									"left": 880,
+									"top": 1075,
+									"width": 217,
+									"height": 10
+								},
+								{
+									"_type": "UMLReceptionCompartmentView",
+									"_id": "AAAAAAFpKneDcx8WHvM=",
+									"_parent": {
+										"$ref": "AAAAAAFpKneDch8OUuM="
+									},
+									"model": {
+										"$ref": "AAAAAAFpKneDcR8MzCI="
+									},
+									"visible": false,
+									"font": "Arial;13;0",
+									"left": -72,
+									"top": -56,
+									"width": 10,
+									"height": 10
+								},
+								{
+									"_type": "UMLTemplateParameterCompartmentView",
+									"_id": "AAAAAAFpKneDcx8XVFE=",
+									"_parent": {
+										"$ref": "AAAAAAFpKneDch8OUuM="
+									},
+									"model": {
+										"$ref": "AAAAAAFpKneDcR8MzCI="
+									},
+									"visible": false,
+									"font": "Arial;13;0",
+									"left": -72,
+									"top": -56,
+									"width": 10,
+									"height": 10
+								}
+							],
+							"font": "Arial;13;0",
+							"containerChangeable": true,
+							"left": 880,
+							"top": 1040,
+							"width": 217,
+							"height": 177,
+							"nameCompartment": {
+								"$ref": "AAAAAAFpKneDch8PyEY="
+							},
+							"attributeCompartment": {
+								"$ref": "AAAAAAFpKneDcx8URfg="
+							},
+							"operationCompartment": {
+								"$ref": "AAAAAAFpKneDcx8Vby4="
+							},
+							"receptionCompartment": {
+								"$ref": "AAAAAAFpKneDcx8WHvM="
+							},
+							"templateParameterCompartment": {
+								"$ref": "AAAAAAFpKneDcx8XVFE="
+							}
 						}
 					]
 				},
@@ -4345,6 +4589,26 @@
 							"name": "error",
 							"visibility": "private",
 							"type": "unsigned char"
+						},
+						{
+							"_type": "UMLAttribute",
+							"_id": "AAAAAAFpKn3+5y1ZFXA=",
+							"_parent": {
+								"$ref": "AAAAAAFpHq11gr6oq4M="
+							},
+							"name": "displayInverted",
+							"visibility": "private",
+							"type": "boolean"
+						},
+						{
+							"_type": "UMLAttribute",
+							"_id": "AAAAAAFpKn8jMS32ETQ=",
+							"_parent": {
+								"$ref": "AAAAAAFpHq11gr6oq4M="
+							},
+							"name": "displayDimmed",
+							"visibility": "private",
+							"type": "boolean"
 						}
 					],
 					"operations": [
@@ -4457,7 +4721,9 @@
 										"$ref": "AAAAAAFpHuGHYr8WkXQ="
 									},
 									"name": "UID",
-									"type": "const unsigned char"
+									"type": "const char",
+									"isReadOnly": true,
+									"defaultValue": "-1"
 								},
 								{
 									"_type": "UMLParameter",
@@ -4565,6 +4831,44 @@
 								}
 							]
 						},
+						{
+							"_type": "UMLOperation",
+							"_id": "AAAAAAFpKn+bUC6TIU8=",
+							"_parent": {
+								"$ref": "AAAAAAFpHq11gr6oq4M="
+							},
+							"name": "const isDisplayInverted",
+							"parameters": [
+								{
+									"_type": "UMLParameter",
+									"_id": "AAAAAAFpKoAK7i70pY4=",
+									"_parent": {
+										"$ref": "AAAAAAFpKn+bUC6TIU8="
+									},
+									"type": "boolean",
+									"direction": "return"
+								}
+							]
+						},
+						{
+							"_type": "UMLOperation",
+							"_id": "AAAAAAFpKoAXui9uQ2w=",
+							"_parent": {
+								"$ref": "AAAAAAFpHq11gr6oq4M="
+							},
+							"name": "const isDisplayDimmed",
+							"parameters": [
+								{
+									"_type": "UMLParameter",
+									"_id": "AAAAAAFpKoBTTC/AlA0=",
+									"_parent": {
+										"$ref": "AAAAAAFpKoAXui9uQ2w="
+									},
+									"type": "boolean",
+									"direction": "return"
+								}
+							]
+						},
 						{
 							"_type": "UMLOperation",
 							"_id": "AAAAAAFpIV35vBs6xGk=",
@@ -4656,7 +4960,8 @@
 									"_parent": {
 										"$ref": "AAAAAAFpJr23GpTCSEg="
 									},
-									"name": "ViewLinkedList *viewLinkedList"
+									"name": "ViewLinkedList *viewLinkedList",
+									"type": ""
 								},
 								{
 									"_type": "UMLParameter",
@@ -5483,6 +5788,14 @@
 							"type": "ViewLink*"
 						}
 					]
+				},
+				{
+					"_type": "UMLClass",
+					"_id": "AAAAAAFpKneDcR8MzCI=",
+					"_parent": {
+						"$ref": "AAAAAAFF+qBWK6M3Z8Y="
+					},
+					"name": "SDCardManager"
 				}
 			]
 		}