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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
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To version 7.5
edited by Kevin Wiki
on 2024/07/05 10:29
Change comment: There is no comment for this version

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... ... @@ -6,19 +6,14 @@
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 +[[image:xserve io main cable and PCB pinout.drawio.png||alt="xserve io main cable pinout.drawio.png"]]
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 +(% class="wikigeneratedid" %)
12 +[[attach:xserve io main cable and PCB pinout.drawio.svg||target="_blank"]]
12 12  
13 -== Sub-paragraph ==
14 +(% class="wikigeneratedid" %)
15 +This cable allows us to communicate with 4 chips using two data lines, audio & service switch, case switch and (yet to be documented) compute LEDs
14 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 +151,124 @@
151 151  }
152 152  {{/code}}
153 153  
149 +== SAA1064T data for driving center IO LED stack ==
150 +
151 +Center IO stack is a stack of 24 LED's, 23 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.
152 +
153 +{{code language="C++"}}
154 +void fillColumns() {
155 + Serial.println("filling columns");
156 + Wire.beginTransmission(saa1064);
157 + Wire.write(1);
158 + Wire.write(0x7F); // 127 - 1111111
159 + Wire.write(0x7F); // 127 - 1111111
160 + Wire.write(0x7F); // 127 - 1111111
161 + Wire.write(0x1F); // 31 - 11111
162 + Wire.endTransmission();
163 +
164 + colsFilled = 1;
165 +}
166 +{{/code}}
167 +
168 +(% class="wikigeneratedid" %)
169 +~-~- Here the last byte we send only is 5 bits since we only have 5 LEDs instead of 6 to address (total of 24). Also note that we start the transmission with a single bit. ~-~-
170 +
154 154  == Pinouts voltages from MLB ==
155 155  
156 156  Powered off:
157 157  
158 158  * PWR fail LED - 0.00 V
176 +* 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
180 +* UID SW - 2.8V
162 162  * HDD LED - 0.00 V
182 +* 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
188 +* 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
192 +* UID SW - 3V
171 171  * HDD LED - 3 V
194 +* Power LED P3V3 - 3.30V
172 172  * Power LED - 0.87 V
173 173  
197 += Controlling top I/O LED =
174 174  
199 +On the top row we have the following input/output devices in order from left to right;
200 +
201 +Left side:
202 +
203 +* physical lock
204 +* lock LED
205 +* warning/service button
206 +* warning/service LED
207 +* locate button
208 +* power LED (red & green)
209 +* fan LED (red & green)
210 +* temperature LED (red & green)
211 +* compute LED (unknown)
212 +
213 +Right side:
214 +
215 +* power LED (red & green)
216 +* fan LED (red & green)
217 +* temperature LED (red & green)
218 +* compute LED (unknown)
219 +* lock switch
220 +
221 +Each sides bank of LEDs are driven by each their PCA9554 shift register. The registers represent the following LEDs: (Note that Lock LED is only present for the LEFT side)
222 +
223 +|=(% scope="row" %)Register|1|2|3|4|5|6|7
224 +|=Device|Power LED Green|Power LED Red|Fan LED Green|Fan LED Red|Temperature LED Green|Temperature LED Red|Lock LED
225 +
226 +To control each LED we shift either a 0 to turn off or 1 to turn on. Since each device shares a single red/green LED (power LED green & power LED red) setting both to 1 at the same time will always leave it red. That is when power LED green and power LED red are both enabled, red always takes precedence.
227 +
228 +Use following script to power LEDs one at a time:
229 +
230 +{{code language="c++"}}
231 +#include <PCA9554.h> // Load the PCA9554 Library
232 +
233 +PCA9554 ioCon1(0x24); // Create an object at this address
234 +
235 +uint8_t mapIO = 0b10000000;
236 +
237 +void shiftL() {
238 + mapIO = (mapIO << 1) | ((mapIO & 0x80) >> 7);
239 +}
240 +
241 +void write() {
242 + Serial.println("writing to PCA9554 device");
243 +
244 + for (int i = 0; i < 8; ++i) {
245 + ioCon1.digitalWrite(i, (mapIO & (1 << i)) ? 0 : 1);
246 + }
247 +}
248 +
249 +void setup()
250 +{
251 + Serial.begin(9600);
252 + Serial.println("Setup");
253 +
254 + ioCon1.portMode(ALLOUTPUT);
255 +}
256 +
257 +void loop()
258 +{
259 + write();
260 + shiftL();
261 +
262 + delay(500);
263 +}
264 +{{/code}}
265 +
266 +
175 175  
176 176  )))
177 177  
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193 193  
194 194  
195 195  
288 +
196 196  )))
197 197  )))
xserve io main cable and PCB pinout.drawio.png
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xserve io main cable and PCB pinout.drawio.svg
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