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+====== CAN-GC7 mergCBUS FastClock Firmware ======
+[[:english|{{  :rocrail-logo-35.png}}]]
+[[:english|Content]] -> [[:english#hardware|Hardware]] -> [[:english#merg_cbus|mergCBUS]]
+  * [[:cbus:overview-en|CAN-GC Overview]]
+  * [[:can-gca1-en|CAN-GC1]] | [[:can-gca1e-en|CAN-GC1e]] | [[:can-gca2-en|CAN-GC2]] | [[:can-gc3-en|CAN-GC3]] | [[:can-gc4-en|CAN-GC4]] | [[:can-gca5-en|CAN-GC5]] | [[:can-gc6-en|CAN-GC6]] | **[[:can-gc7-en| CAN-GC7]] **
+    * **[[:cbus:can-gc7-firmware|Firmware]]**
+    * [[:cbus:flim|FLiM Setup]]
+ \\
+This page documents the HEAD revision of the firmware.\\
+{{:cbus:gc7-help.jpg?400}}\\
+ \\
+===== Description =====
+The firmware is based on CAN-GC2.\\
+The clock has __no RTC__ for keeping up time if no minute syncs are received.\\
+ \\
+===== Features =====
+  * Model time display as received by the [[#opc|OPC_FCLK]].
+  * Displays "''** - - - - **''" until the first sync is received.
+  * Displays "''** H E L P **''" if __no sync__ was received within a model time minute based on the last received divider.
+  * Brightness correction by dialog.
+  * The hours/minutes separator shows the model second pulse.
+  * Freeze/Resume support; The separator will stop flashing on freeze.
+  * Shows Time/Date/Temperature alternately.
+  * Day of week represented by seven LEDs on the left.
+ \\
+===== Not supported =====
+  * Boot mode.
+ \\
+===== Firmware =====
+| Firmware version: **1.a** rev.: 296, resonator: **8MHz** | \\
+==== Copyrights ====
+(c) [[http://www.merg.org.uk/|MERG]]\\
+(c) [[http://www.rocrail.net|Rob Versluis, rocrail.net]]\\
+==== IDs ====
+| NMRA Manufacturer ID |  70 |
+| Product ID |  7 |\\
+==== HEX ====
+  * https://launchpad.net/rocrail-hardware/+download
+==== Sources ====
+  * https://gitlab.com/rocrail/GCA/tree/master/cbus
+ \\
+===== OPC =====
+<code>
+#define OPC_FCLK    0xCF    // Fast clock event
+  cmd[0] = OPC_FCLK;
+  cmd[1] = mins;
+  cmd[2] = hours;
+  cmd[3] = wday; // bit 0-3: 1 = Sunday, 2 = Monday
+  cmd[3] = mon; // bit 4-7: 1 = January, 2 = February, ...
+  cmd[4] = div; // 0 = Freeze, 1 = Real time
+  cmd[5] = mday; // 1..31
+  cmd[6] = temperature; // -127...127 degrees
+</code>
+ \\
+===== Node Variables =====
+^ # ^ Description ^
+|  1 | node configuration |
+|  2 | CAN-ID |
+ \\
+===== Node configuration byte =====
+^ Bit ^  Function  ^ Remark ^
+|  0-3 | display illumination: 1...12 | |
+|  4 | show date alternating | |
+|  5 | positive logic display | Depends on used display type with common anode or cathode. |
+|  6 | show 'model' temperature alternating | |
+ \\
+===== Development Tools =====
+  * MPLAB X v1.00
+  * C18 v3.40
+  * PICKit 3
+  * **[[:pic-adap-en|PICKit3 Adapter]]**