OneWire GPIO bus Master - Revision history

JulienB: /* Supported boards and software versions */

2017-09-19T13:49:01Z

Supported boards and software versions

← Older revision		Revision as of 15:49, 19 September 2017
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	* Use the latest Armadeus GIT/SF repository or the latest stable release.		* Use the latest Armadeus GIT/SF repository or the latest stable release.
	* Currently, with [[APF28]] modules, only the [[APF28Dev]] board is supported, but it's easy to add support to another boards. (Check linux-2.6.35.3/arch/arm/mach-mx28/apf28dev.c file)		* Currently, with [[APF28]] modules, only the [[APF28Dev]] board is supported, but it's easy to add support to another boards. (Check linux-2.6.35.3/arch/arm/mach-mx28/apf28dev.c file)
	* Following instructions were also successfully tested on [[OPOS6ULDev]].		* Following instructions were also successfully tested on [[OPOS6ULDev]] with bitbanging OneWire Linux emulation (GPIO). Indeed i.MX6UL doesn't have hardware OneWire master. '''Please note that using GPIO bitbanging reduces a lot the maximum length of 1Wire cable that can be used !!'''

	== Software installation ==		== Software installation ==

2017-03-31T13:38:54Z

← Older revision		Revision as of 15:38, 31 March 2017
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	Informations and HOWTOs for Armadeus OneWire support.		Informations and HOWTOs for Armadeus OneWire support.

	~~Author~~: [[User:JanosA]]		Authors: [[User:JanosA\|JanosA]]/[[User:JulienB\|JulienB]]

	== Supported boards and software versions ==		== Supported boards and software versions ==

2017-03-31T13:38:16Z

freq scaling

← Older revision		Revision as of 15:38, 31 March 2017
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	== How it works ==		== How it works ==

	{{Warning\|GPIO bitbanging method used here is not compatible with frequency scaling, so, if activated, you have to switch to ''performance'' governor, otherwise your 1-wire bus might mis-function after system boot... Otherwise you may have problems to detect devices and see in dmesg: <pre class="apf"> w1_master_driver w1_bus_master1: w1_search: max_slave_count 64 reached, will continue next search.</pre>}}		{{Warning\|GPIO bitbanging method used here is not compatible with [[Linux_Dynamic_Frequency_Scaling\|frequency scaling]], so, if activated, you have to switch to ''performance'' governor, otherwise your 1-wire bus might mis-function after system boot... Otherwise you may have problems to detect devices and see in dmesg: <pre class="apf"> w1_master_driver w1_bus_master1: w1_search: max_slave_count 64 reached, will continue next search.</pre>}}

	The OneWire bus master driver every 10 seconds scan the bus for new slave devices.		The OneWire bus master driver every 10 seconds scan the bus for new slave devices.

2017-03-31T13:23:11Z

Software installation

← Older revision		Revision as of 15:23, 31 March 2017
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	== Software installation ==		== Software installation ==
	* If not done ~~bye~~ default, recompile your Linux kernel with OneWire GPIO bus master (and some slave device) support.		* If not done by default, recompile your Linux kernel with OneWire GPIO bus master (and some slave device) support.
	<pre class="host">		<pre class="host">
	$ make linux-menuconfig		$ make linux-menuconfig

2016-12-30T17:13:55Z

How it works

← Older revision		Revision as of 19:13, 30 December 2016
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	== How it works ==		== How it works ==

	{{Warning\|GPIO bitbanging method used here is not compatible with frequency scaling, so, if activated, you have to switch to ''performance'' governor, otherwise your 1-wire bus might mis-function after system boot...}}		{{Warning\|GPIO bitbanging method used here is not compatible with frequency scaling, so, if activated, you have to switch to ''performance'' governor, otherwise your 1-wire bus might mis-function after system boot... Otherwise you may have problems to detect devices and see in dmesg: <pre class="apf"> w1_master_driver w1_bus_master1: w1_search: max_slave_count 64 reached, will continue next search.</pre>}}

	The OneWire bus master driver every 10 seconds scan the bus for new slave devices.		The OneWire bus master driver every 10 seconds scan the bus for new slave devices.

2016-12-29T15:24:49Z

Tested sensors

← Older revision		Revision as of 17:24, 29 December 2016
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	==Tested sensors==		==Tested sensors==
	* [https://www.adafruit.com/product/381 Waterproof DS18B20]		* [https://www.adafruit.com/product/381 Waterproof DS18B20]

			==Links==
			* [http://www.framboise314.fr/mesure-de-temperature-1-wire-ds18b20-avec-le-raspberry-pi/ Fr:Mesure de température avec DS18B20 sur RPi]

2016-12-29T15:08:38Z

← Older revision		Revision as of 17:08, 29 December 2016
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			[[Category:Domotic]]
			[[Category:1-Wire]]

	Informations and HOWTOs for Armadeus OneWire support.		Informations and HOWTOs for Armadeus OneWire support.

2016-12-29T15:07:12Z

Supported boards and software versions

← Older revision		Revision as of 17:07, 29 December 2016
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	* Use the latest Armadeus GIT/SF repository or the latest stable release.		* Use the latest Armadeus GIT/SF repository or the latest stable release.
	* Currently, with [[APF28]] modules, only the [[APF28Dev]] board is supported, but it's easy to add support to another boards. (Check linux-2.6.35.3/arch/arm/mach-mx28/apf28dev.c file)		* Currently, with [[APF28]] modules, only the [[APF28Dev]] board is supported, but it's easy to add support to another boards. (Check linux-2.6.35.3/arch/arm/mach-mx28/apf28dev.c file)
	* Following instructions were successfully ~~testes~~ on [[OPOS6ULDev]]		* Following instructions were also successfully tested on [[OPOS6ULDev]].

	== Software installation ==		== Software installation ==

2016-12-29T15:04:57Z

← Older revision		Revision as of 17:04, 29 December 2016
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	</pre>		</pre>
	The t=29812 means, the temperature is: 29.812°C		The t=29812 means, the temperature is: 29.812°C

			==Tested sensors==
			* [https://www.adafruit.com/product/381 Waterproof DS18B20]

2016-12-29T15:02:07Z

Hardware Notes

← Older revision		Revision as of 17:02, 29 December 2016
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	** GND is pin 6 of J3		** GND is pin 6 of J3
	* Add an 4,7k pull-up resistor between 3.3V and DQ		* Add an 4,7k pull-up resistor between 3.3V and DQ
	[[~~Image~~:DS18B20_on_OPOS6ULDev.png]]		[[File:DS18B20_on_OPOS6ULDev.png\|100px\|thumb]]
	\|}		\|}