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Changes for page Front I/O

Last modified by Kevin Wiki on 2024/07/07 22:48
From version 4.2
edited by Kevin Wiki
on 2024/07/04 23:40
Change comment: There is no comment for this version
To version 7.4
edited by Kevin Wiki
on 2024/07/05 10:16
Change comment: There is no comment for this version

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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 -[[image:xserve io main cable pinout.drawio.png]]
9 +[[image:xserve io main cable and PCB pinout.drawio.png||alt="xserve io main cable pinout.drawio.png"]]
10 10  
11 11  (% class="wikigeneratedid" %)
12 -[[attach:xserve io main cable pinout.drawio.svg||target="_blank"]]
12 +[[attach:xserve io main cable and PCB pinout.drawio.svg||target="_blank"]]
13 13  
14 -
15 15  (% class="wikigeneratedid" %)
16 16  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
17 17  
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149 149  
150 150  == SAA1064T data for driving center IO LED stack ==
151 151  
152 -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.
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.
153 153  
154 154  {{code language="C++"}}
155 155  void fillColumns() {
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167 167  {{/code}}
168 168  
169 169  (% class="wikigeneratedid" %)
170 -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.
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. ~-~-
171 171  
172 172  == Pinouts voltages from MLB ==
173 173  
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195 195  * Power LED P3V3 - 3.30V
196 196  * Power LED - 0.87 V
197 197  
198 -
197 += Controlling top I/O LED =
198 +
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 +
220 +Each side is driven by each their PCA9554 shift register. The registers represent the following LEDs: (Note that Lock LED is only present for the LEFT side)
221 +
222 +|=(% scope="row" %)Register|1|2|3|4|5|6|7
223 +|=Device|Power LED Green|Power LED Red|Fan LED Green|Fan LED Red|Temperature LED Green|Temperature LED Red|Lock LED
224 +
225 +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.
199 199  )))
200 200  
201 201  
xserve io main cable pinout.drawio.png
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