User:JanosA - Revision history

JanosA: OneWire moved to main Wiki Tree

2013-05-19T13:39:25Z

OneWire moved to main Wiki Tree

JanosA: RS-485 moved to main Wiki Tree

2013-05-15T18:53:41Z

RS-485 moved to main Wiki Tree

JanosA at 22:00, 9 May 2013

2013-05-09T22:00:04Z

JanosA at 20:23, 9 May 2013

2013-05-09T20:23:19Z

JanosA at 20:20, 9 May 2013

2013-05-09T20:20:11Z

JanosA at 20:17, 9 May 2013

2013-05-09T20:17:53Z

JanosA: Adding OneWire Informations

2013-05-09T19:09:23Z

Adding OneWire Informations

JanosA at 21:55, 6 May 2013

2013-05-06T21:55:37Z

JanosA at 21:50, 6 May 2013

2013-05-06T21:50:19Z

JanosA at 21:46, 6 May 2013

2013-05-06T21:46:08Z

@@ Line 4: / Line 4: @@
 My hobby is programming embedded systems and creating my own small electronic boards.
-=== Skills ===
+== Skills ==
 * Assembly programming: PIC 8bit family
 * C programming: PIC 8bit / PIC32MX family, Linux
@@ Line 12: / Line 12: @@
 * IP networking
-=== My ArmadeuS plans (APF28 based) ===
+== My ArmadeuS plans (APF28 based) ==
 * Creating an universal home automation hardware for my friends, with easy programming in perl or PHP. :)
 * Datacenter temperature monitoring, with RS-485 and OneWire communications.
 * Data logger for Saia Sbus based intelligent power meters.
+== My works comitted to ArmadeuS project ==
+* [[RS-485]] for APF28/iMX28 mxs-auart and busybox stty patch
-== RS-485 ==
+* [[OneWire GPIO bus Master]] for APF28DEV
-Informations and mini HOWTOs for my APF28/iMX28 mxs-auart and busybox stty patches moved to the main Wiki tree: [[RS-485]]
-−
-−
-−
-== OneWire ==
-Informations and mini HOWTOs for my APF28DEV OneWire patch.
-−
-−
-=== Software installation ===
-* Recompile your Linux kernel with OneWire GPIO bus master (and some slave device) support.
-<pre class="host">
-$ make linux-menuconfig
-</pre>
-<pre class="config">
-Device Drivers  --->
-    <*> Dallas's 1-wire support  --->
--wire Bus Masters  --->
-            <*> GPIO 1-wire busmaster
--wire Slaves  --->
-            <*> Thermal family implementation
-</pre>
-<pre class="host">
-$ make
-</pre>
-* Reflash your Linux kernel
-−
-−
-=== Hardware Notes ===
-* Connect the OneWire slave directly to the APF28_DEV board J9 connector:
-  * Vcc 3.3V is pin 1 on J9 connector
-  * DQ is pin 31 on J9 (LCD_D18 / GPIO 1_18)
-  * GND is pin 39 on J9
-* Add an 1.2k pullup resistor between Vcc and DQ
-−
-−
-=== How it works ===
-The OneWire bus master driver every 10 seconds scan the bus for new slave devices.
-−
-Each detected OneWire slave device have a sub-directory with it's unique ID in "/sys/devices/w1 bus master".
-−
-The sub-directory format is <2 digit family ID>-<12 digit unique ID>.
-<pre class=apf>
-# ls -la /sys/devices/w1\ bus\ master/
-total 0
-drwxr-xr-x    4 root     root             0 Jan  1 01:06 .
-drwxr-xr-x    6 root     root             0 Jan  1 01:05 ..
-drwxr-xr-x    3 root     root             0 Jan  1 01:06 28-000001e68904
-lrwxrwxrwx    1 root     root             0 Jan  1 01:07 driver -> ../../bus/w1/drivers/w1_master_driver
-drwxr-xr-x    2 root     root             0 Jan  1 01:07 power
-lrwxrwxrwx    1 root     root             0 Jan  1 01:07 subsystem -> ../../bus/w1
--rw-r--r--    1 root     root          4096 Jan  1 01:07 uevent
--rw-rw-rw-    1 root     root          4096 Jan  1 01:07 w1_master_add
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_attempts
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_max_slave_count
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_name
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_pointer
--rw-rw-rw-    1 root     root          4096 Jan  1 01:07 w1_master_pullup
--rw-rw-rw-    1 root     root          4096 Jan  1 01:07 w1_master_remove
--rw-rw-rw-    1 root     root          4096 Jan  1 01:07 w1_master_search
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_slave_count
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_slaves
--r--r--r--    1 root     root          4096 Jan  1 01:07 w1_master_timeout
-</pre>
-You can list the detected slaves from this files:
-<pre class=apf>
-# cat /sys/devices/w1\ bus\ master/w1_master_slave_count
-−
-# cat /sys/devices/w1\ bus\ master/w1_master_slaves
--000001e68904
-</pre>
-Let's read the temperature: (The 28-xxx family is a DS18B20 temperature sensor in this example.)
-<pre class=apf>
-# cat /sys/devices/w1\ bus\ master/28-000001e68904/w1_slave
-dd 01 4b 46 7f ff 03 10 1e : crc=1e YES
-dd 01 4b 46 7f ff 03 10 1e t=29812
-</pre>
-The t=29812 means, the temperature is: 29.812°C

@@ Line 19: / Line 19: @@
+== RS-485 ==
-== RS485 ==
+Informations and mini HOWTOs for my APF28/iMX28 mxs-auart and busybox stty patches moved to the main Wiki tree: [[RS-485]]
-Informations and mini HOWTOs for my APF28/iMX28 mxs-auart and busybox stty patches.
-−
-−
-=== Linux stty ===
-* Setup APF28 serial port for RS485 communication:
-<pre class=apf>
-# stty -F /dev/ttySP0 raw
-# stty -F /dev/ttySP0 -echo -echoe -echok
-# stty -F /dev/ttySP0 rs485
-</pre>
-−
-* Set extra delays for TXEN/RTS signaling before and after the transmitted packet (in microseconds):
-<pre class=apf>
-# stty -F /dev/ttySP0 rs485delaybefore 100
-# stty -F /dev/ttySP0 rs485delayafter 100
-</pre>
-−
-* To get current RS485 parameters. (If the port device supports the RS485 options you will see the last two lines)
-<pre class=apf>
-# stty -F /dev/ttySP0
-speed 9600 baud; line = 0;
-intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
-eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
-werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
--brkint -imaxbel
-rs485 -rs485rtsonsend -rs485rtsaftersend -rs485rxduringtx
-rs485delaybefore = 100; rs485delayafter = 100; rs485delaylastchartx = 1250;
-</pre>
-Please note:
-* You can't set the "rs485delaylastchartx" parameter, it's calculated automatically from the baudrate.
-Special notes for the APF28/iMX28 mxs-auart driver:
-* All delays are in microseconds.
-* The "rs485delaylastchartx" parameter is not used in DMA mode.
-* The parameters: "rs485rtsonsend" "rs485rtsaftersend" "rs485rxduringtx" are not used. (Only used by atmel_serial.c and crisv10.c drivers)
-* If the RS485 mode is turned on, it will override (turn off) the RTS/CTS hardware flow settings of the uart, don't care what is configured.
-−
-−
-=== C code ===
-* The RS485 mode can be turned on with ioctl calls from C code, here is the example:
-<source lang="C">
-#include <stdio.h>
-#include <fcntl.h>
-#include <linux/ioctl.h>
-#include <linux/serial.h>
-#include <asm-generic/ioctls.h> /* TIOCGRS485 + TIOCSRS485 ioctl definitions */
-−
-int main(void) {
-         struct serial_rs485 rs485conf;
-−
-         int fd = open ("/dev/ttySP0", O_RDWR);
-         if (fd < 0) {
-                 printf("Error: Can't open: /dev/ttySP0\n");
-−
-−
-−
-         /* Don't forget to read first the current state of the RS485 options with ioctl.
-            If You don't do this, You will destroy the rs485conf.delay_rts_last_char_tx
-            parameter which is automatically calculated by the driver when You opens the
-            port device. */
-         if (ioctl (fd, TIOCGRS485, &rs485conf) < 0) {
-                 printf("Error: TIOCGRS485 ioctl not supported.\n");
-−
-−
-         /* Enable RS485 mode: */
-         rs485conf.flags |= SER_RS485_ENABLED;
-−
-         /* Set rts/txen delay before send, if needed: (in microseconds) */
-         rs485conf.delay_rts_before_send = 0;
-−
-         /* Set rts/txen delay after send, if needed: (in microseconds) */
-         rs485conf.delay_rts_after_send = 0;
-−
-         if (ioctl (fd, TIOCSRS485, &rs485conf) < 0) {
-                 printf("Error: TIOCSRS485 ioctl not supported.\n");
-−
-−
-         fcntl(fd, F_SETFL, 0);
-         int n = write(fd, "ABC\r\n", 5);
-         if (n < 0) {
-                 /* Error handling */
-−
-−
-         if (close (fd) < 0) {
-                 printf("Error: Can't close: /dev/ttySP0\n");
-−
-−
-</source>
-−
-−
-=== Hardware Notes ===
-* The RS485 Transmit Enable (TXEN) output will be the RTS pin of the uart.
-* The TXEN/RTS output is _active low_, it must be inverted to use it with the popular RS485 transceiver ICs.
-* When the u-boot runs and the board start to boot, the RTS pin works as input, please add a pullup resistor to this pin before the inverter, to prevent RS485 bus lockups.
-−

@@ Line 124: / Line 124: @@
 === Software installation ===
 * Recompile your Linux kernel with OneWire GPIO bus master (and some slave device) support.
 <pre class="host">
 $ make linux-menuconfig

@@ Line 16: / Line 16: @@
 * Datacenter temperature monitoring, with RS-485 and OneWire communications.
 * Data logger for Saia Sbus based intelligent power meters.
@@ Line 123: / Line 119: @@
 == OneWire ==
-Informations and mini HOWTOs for my APF28DEV OneWire patches.
+Informations and mini HOWTOs for my APF28DEV OneWire patch.

@@ Line 189: / Line 189: @@
 -000001e68904
 </pre>
-Let's read the temperature:
+Let's read the temperature: (The 28-xxx family is a DS18B20 temperature sensor in this example.)
 <pre class=apf>
 # cat /sys/devices/w1\ bus\ master/28-000001e68904/w1_slave