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Changes for page Front I/O

Last modified by Kevin Wiki on 2024/07/07 22:48
From version 4.1
edited by Kevin Wiki
on 2024/07/04 23:07
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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 +(% 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
16 +
14 14  = How we got here =
15 15  
16 16  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.
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145 145  
146 146  == SAA1064T data for driving center IO LED stack ==
147 147  
148 -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.
149 149  
150 150  {{code language="C++"}}
151 151  void fillColumns() {
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163 163  {{/code}}
164 164  
165 165  (% class="wikigeneratedid" %)
166 -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. ~-~-
167 167  
168 168  == Pinouts voltages from MLB ==
169 169  
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191 191  * Power LED P3V3 - 3.30V
192 192  * Power LED - 0.87 V
193 193  
194 -
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.
195 195  )))
196 196  
197 197  
xserve io main cable pinout.drawio.png
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