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Changes for page Front I/O

Last modified by Kevin Wiki on 2024/07/07 22:48
From version 3.2
edited by Kevin Wiki
on 2024/07/04 23:00
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To version 2.3
edited by Kevin Wiki
on 2024/07/04 18:14
Change comment: There is no comment for this version

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... ... @@ -6,9 +6,19 @@
6 6  
7 7  There is a single cable that controls four parts, each half side of I/O LED and center column of blue LEDs.
8 8  
9 -== ==
9 +== Sub-paragraph ==
10 10  
11 +Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
11 11  
13 +== Sub-paragraph ==
14 +
15 +Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
16 +
17 +=== Sub-sub paragraph ===
18 +
19 +Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
20 +
21 +
12 12  = How we got here =
13 13  
14 14  Measure out the ground and power signals by comparing with other chips on board. E.g. we find [SAA1064T] datasheet, locate the GND (Vee) and 5V (Vcc) and measure connectivity (0 ohm resistance) between chip pins and cable pins. This gives us pins GND 2 & 8 and PWR 16 & 22.
... ... @@ -141,47 +141,25 @@
141 141  }
142 142  {{/code}}
143 143  
144 -== SAA1064T data for driving center IO LED stack ==
145 -
146 -Center IO stack is a stack of 23 LED's, 22 blue and 1 green for ethernet activity. These are duplicated next to each other and driven by each their SAA1064T chips. Earlier we found the i2c address and just by playing around figured out that 4 segments of 1 byte binary values are used to set ship register.
147 -
148 -{{code language="C++"}}
149 -void fillColumns() {
150 - Serial.println("filling columns");
151 - Wire.beginTransmission(saa1064);
152 - Wire.write(1);
153 - Wire.write(0x7F); // 127 - 1111111
154 - Wire.write(0x7F); // 127 - 1111111
155 - Wire.write(0x7F); // 127 - 1111111
156 - Wire.write(0x1F); // 31 - 11111
157 - Wire.endTransmission();
158 -
159 - colsFilled = 1;
160 -}
161 -{{/code}}
162 -
163 -(% class="wikigeneratedid" %)
164 -Here the last byte we send only is 5 bits since we only have 5 LEDs instead of 6 to address (total of 23). Also note that we start the transmission with a single bit.
165 -
166 166  == Pinouts voltages from MLB ==
167 167  
168 168  Powered off:
169 169  
170 170  * PWR fail LED - 0.00 V
171 -* UID LED - 4.5V
172 172  * OH/Fan fail LED - 4.72 V
173 173  * NIC1 LED - 0.8 - 2.6 V
174 174  * NIC2 LED - 2.95 V
175 -* UID SW - 2.8V
176 176  * HDD LED - 0.00 V
177 -* Power LED P3V3 - 0.00V
178 178  * Power LED - 0.00 V after unplug grows
164 +* Power LED P3V3 - 0.00V
165 +* UID SW - 2.8V
166 +* UID LED - 4.5V
179 179  
180 180  Powered on:
181 181  
182 182  * PWR tail LED - 3.47 V
183 -* UID LED - 4.85V
184 184  * OH/Fan failed LED - 5 V
172 +* UID LED - 4.85V
185 185  * NIC 1 LED - 1.2 - 2.9 V
186 186  * NIC 2 LED - 3.2 V
187 187  * UID SW - 3V
... ... @@ -189,6 +189,7 @@
189 189  * Power LED P3V3 - 3.30V
190 190  * Power LED - 0.87 V
191 191  
180 +
192 192  
193 193  )))
194 194  
... ... @@ -210,6 +210,5 @@
210 210  
211 211  
212 212  
213 -
214 214  )))
215 215  )))