Embedded controller: Difference between revisions
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{{OBX source dev|projects/openec}} |
{{OBX source dev|projects/openec}} |
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{{Olpcboxbottom}} |
{{Olpcboxbottom}} |
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[[Category:Firmware]] |
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[[Category:SoC Project]] |
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{{OLPC}} |
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= Introduction = |
= Introduction = |
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OLPC is now working in an Open implementation of the XOs Embedded Controller |
OLPC is now working in an Open implementation of the XOs Embedded Controller |
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The code of the EC is programed to a [[Image:KB3700-ds-01.pdf]] that has an 8051 microprocessor, for the code to be open we need to compile everything in [[SDCC]] or OFW. |
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The need for an open implementation is due to the fact that the actual EC has some flakiness in the recovery process.(among many other things). |
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An example of a bug of the old EC can be found in {{ticket|477}} |
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== Background == |
== Background == |
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The EC is programed in the KB3700 and it has a paramount importance in controlling the XO when the CPU is not active. |
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For doing so the KB3700 has to communicate with the CPU via the [[Revised_EC_Port_6C_Command_Protocol|EC protocol]], this protocol is managed in the ports 0x66 and 0x62 of the KB3700. These two ports are serially connected with the 0x6C and 0x68 ports of the CPU. (for more info check [[Ec_specification]]). |
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But the KB3700 has to communicate also with the DS2657 (The battery charger) via the 1 wire Dallas protocol. |
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One can deduce some of the inside programing of the EC via the [http://dev.laptop.org/~rafael/EcDump1.fth ec-dump.fth] under OpenFirmware. |
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Running the ec-dump script give us valuable data about internals of the ec, mostly the [[EC_Register_Settings]] |
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The procedure to run '''ec-dump''' over internet in a wireless connection is: |
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ok wifi media lab 802.11 *change it to your name AP |
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ok fl http:\\18.85.2.147\~rafael\EcDump1.fth *change to your AP IP direction |
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Running '''ec-dump''' over internet and saving the file in a USB key: |
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ok wifi media lab 802.11 *change it to your name AP |
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ok fload http:\\18.85.2.147\~rafael\to-file.fth |
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ok to-file u:\ec-dump fload http:\\18.85.2.147\~rafael\EcDump1.fth |
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= Actual development = |
= Actual development = |
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All the work is going to be in the git repository [http://dev.laptop.org/git.do?p=projects/openec;a=summary |
All the work is going to be in the git repository [http://dev.laptop.org/git.do?p=projects/openec;a=summary] |
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To get this code in your machine please do: |
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git-clone git://dev.laptop.org/projects/openec |
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''For info check [[Importing_your_project]]'' |
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== Desired Features == |
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* Failsafe Code |
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* Easy debugging |
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* Forth/C implementation. |
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* GCC compilable. |
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== |
== Preliminary Work == |
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* Testing |
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| ⚫ | |||
==Mail list== |
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| ⚫ | |||
[[Category:EC]] |
[[Category:EC]] |
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Revision as of 01:34, 23 August 2007
Introduction
OLPC is now working in an Open implementation of the XOs Embedded Controller
Background
Actual development
All the work is going to be in the git repository [1]