OneWire GPIO bus Master - Revision history

JulienB: /* Supported boards and software versions */

2017-09-19T13:49:01Z

‎Supported boards and software versions

2017-03-31T13:38:54Z

2017-03-31T13:38:16Z

freq scaling

2017-03-31T13:23:11Z

‎Software installation

2016-12-30T17:13:55Z

‎How it works

2016-12-29T15:24:49Z

‎Tested sensors

2016-12-29T15:08:38Z

2016-12-29T15:07:12Z

‎Supported boards and software versions

2016-12-29T15:04:57Z

2016-12-29T15:02:07Z

‎Hardware Notes

@@ Line 9: / Line 9: @@
 * 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)
-* 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 ==

@@ Line 4: / Line 4: @@
 Informations and HOWTOs for Armadeus OneWire support.
-Author: [[User:JanosA]]
+Authors: [[User:JanosA|JanosA]]/[[User:JulienB|JulienB]]
 == Supported boards and software versions ==

@@ Line 51: / Line 51: @@
 == 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.

@@ Line 12: / Line 12: @@
 == 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">
 $ make linux-menuconfig

@@ Line 51: / Line 51: @@
 == 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.

← Older revision		Revision as of 15:24, 29 December 2016
Line 97:		Line 97:
	==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]

← Older revision		Revision as of 15:08, 29 December 2016
Line 1:		Line 1:
		+	[[Category:Domotic]]
		+	[[Category:1-Wire]]
		+
	Informations and HOWTOs for Armadeus OneWire support.		Informations and HOWTOs for Armadeus OneWire support.

← Older revision		Revision as of 15:04, 29 December 2016
Line 91:		Line 91:
	</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]

@@ Line 43: / Line 43: @@
 ** GND is pin 6 of J3
 * Add an 4,7k pull-up resistor between 3.3V and DQ
-[[Image:DS18B20_on_OPOS6ULDev.png]]
+[[File:DS18B20_on_OPOS6ULDev.png|100px|thumb]]
 |}