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Changes for page Front I/O

Last modified by Kevin Wiki on 2024/07/07 22:48
From version 7.2
edited by Kevin Wiki
on 2024/07/05 09:26
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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148 148  
149 149  == SAA1064T data for driving center IO LED stack ==
150 150  
151 -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.
152 152  
153 153  {{code language="C++"}}
154 154  void fillColumns() {
... ... @@ -166,7 +166,7 @@
166 166  {{/code}}
167 167  
168 168  (% 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 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. ~-~-
170 170  
171 171  == Pinouts voltages from MLB ==
172 172  
... ... @@ -194,7 +194,35 @@
194 194  * Power LED P3V3 - 3.30V
195 195  * Power LED - 0.87 V
196 196  
197 -
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.
198 198  )))
199 199  
200 200