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Changes for page Front I/O

Last modified by Kevin Wiki on 2024/07/07 22:48
From version 2.2
edited by Kevin Wiki
on 2024/07/04 17:53
Change comment: There is no comment for this version
To version 3.2
edited by Kevin Wiki
on 2024/07/04 23:00
Change comment: There is no comment for this version

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... ... @@ -6,19 +6,9 @@
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 -== Sub-paragraph ==
9 +== ==
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.
12 12  
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 -
22 22  = How we got here =
23 23  
24 24  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.
... ... @@ -151,27 +151,54 @@
151 151  }
152 152  {{/code}}
153 153  
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 +
154 154  == Pinouts voltages from MLB ==
155 155  
156 156  Powered off:
157 157  
158 158  * PWR fail LED - 0.00 V
171 +* UID LED - 4.5V
159 159  * OH/Fan fail LED - 4.72 V
160 160  * NIC1 LED - 0.8 - 2.6 V
161 161  * NIC2 LED - 2.95 V
175 +* UID SW - 2.8V
162 162  * HDD LED - 0.00 V
177 +* Power LED P3V3 - 0.00V
163 163  * Power LED - 0.00 V after unplug grows
164 164  
165 165  Powered on:
166 166  
167 167  * PWR tail LED - 3.47 V
183 +* UID LED - 4.85V
168 168  * OH/Fan failed LED - 5 V
169 169  * NIC 1 LED - 1.2 - 2.9 V
170 170  * NIC 2 LED - 3.2 V
187 +* UID SW - 3V
171 171  * HDD LED - 3 V
189 +* Power LED P3V3 - 3.30V
172 172  * Power LED - 0.87 V
173 173  
174 -
175 175  
176 176  )))
177 177  
... ... @@ -193,5 +193,6 @@
193 193  
194 194  
195 195  
213 +
196 196  )))
197 197  )))