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--- projects:crazyflie:firmware:log [2012-10-07 13:56]
arnaud
+++ projects:crazyflie:firmware:log [2013-03-20 10:14]
arnaud
@@ Line 5: / Line 5: @@
 This mechanism is used both for regular log operation (ie. user requested log to inspect and debug flight data) but also to update indication in the GUI application.
-Each variable to log is contained in a
+Each variable to log is contained in a group group and has a name. The system is designed to make it easy to add a log variable in the Firmware and have it available in the ground station GUI:
-===== Communication protocol =====
+{{:projects:crazyflie:firmware:logmagic.png?800|}}
-The log port is separated in 3 channels:
-^ **Port**  ^ **Channel** ^ **Function**      ^
-|   5       |    0        | [[comm_protocol#table_of_content_access|Table of content access]] |
-|   5       |    1        | [[comm_protocol#log_settings_access| Log settings access]] |
-|   5       |    2        | [[comm_protocol#log_data_access|Log data access]] |
-==== Table of content access ====
-This channel is used to access the loggable variables table of content.
-The first byte of each messages correspond a command. All communication on this port are initated by the client and all answer from the copter will contain the same command byte.
-^ TOC command byte ^ Meaning             ^
-|                0 | Get TOC Element     |
-|                1 | Get TOC information |
-=== Get TOC element ===
-<code>
-Request (PC to Copter):
-        +-------------+------------+
-        | Command (0) | Element ID |
-        +-------------+------------+
-Length         1            1
-Answer (Copter to PC):
-        +-------------+------------+------+------------+--------------+
-        | Command (0) | Element ID | Type |   Group    |     Name     |
-        +-------------+------------+------+------------+--------------+
-Length        1             1         1    < Null terminated strings >
-</code>
-^ Request fields ^ Content                             ^
-| Command        | Must be 0 for GET_ELEMENT operation |
-| Element ID     | ID of the element to be retrieved. The variables are numbered from 0 to LOG_LEN (see GET_INFO command) |
-^ Answer fields  ^ Content                             ^
-| Command        | 0 for GET_ELEMENT operation |
-| Element ID     | ID of the element returned  |
-| Type           | Variable type of the element. See variable types list |
-| Group          | Null-terminated string containing variable group |
-| Name           | Null-terminated string containing the variable name |

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