1-Wire and mini2440

Forum: Linux
Peter 
hi folks,

first of all, sorry for my poor englisch. :-(

i donīt understand a lot of hardware/electric,
i am more a linux sysadmin.

i want to realise a project and need some hardware.
everybody told me to buy a foxboard, but the micro2440/mini2440 looks
better.

ok what i want to do?

a want to check 6 1-wire DS18B20 temperature sensors,
and log the temperature for graphing.

depends on the temperature, i would like to switch a solenoid valve which
works with 24 V/AC.(i need some relais they told me)
with no elektric the valve is open, with electric the valve is closed.

i didntīfind anything about 1-wire and mini2440 on the internet and here im
forum.
is it possible to connect the 1-wire sensors to the mini2440 out of the
box, using some gpio like on this picture of the foxboard?
(http://foxg20.acmesystems.it/lib/exe/fetch.php?media=tutorial:ds18b20_wi...)

can i connect my relais for my valve on this board, and what do i need for
that?

in the future i also want to use this board as timer for 2
waterpumps(230V), more relais are needed.

and finaly a got a power meters with S0 Interface,
witch a would like to log the amount of electricity the pumps used.

is all this posible with a mini/micro2440?

i just want to know if i could use this all with a mini/micro2440 and what
hardware do i need to buy as well,
the rest under linux, reading,logging,graphing etc.. is not that problem i
think.

thanx in advance guys
Peter

Phil_in_China 
Hi Peter

It seems like you want to control room temperature in a home. 
The mini2440 will do all that you want, however it might be 
easier to develop using the micro2440. The I/O pins that are
available are more than adequate, you will need to add a relay
drive circuit for each relay needed. But the circuit is very
simple, just a few resistors and a transistor for each. You
will probably need an extra external power supply as each
relay circuit will not be enough for the relay drivers.
Good luck

Phil

Tommy 
> can i connect my relais for my valve on this board, and what do i need 
> for that?
Do you know the relay board from BusError (Michel Pollet)
http://bliterness.blogspot.com/2009/05/mini2440-relay-board.html

Sebastien 
Controlling some DS18B20 is pretty simple.

But, to achieve this in a simple way, you'll have to recompile a kernel


First of all, you must put some 1-wire drivers in your kernel.
<b>
W1_MASTER_GPIO=Y (1wire bus master)
W1_SLAVE_THERM=Y (Thermal family implementation)
</b>
do it with a graphical configuration tool, this is the simplest way...



Then edit linux-2.6.32.2/arch/arm/mach-s3c2440/mac-mini2440.c

and add following structures ...

<b>
/* 1wire bus master */
static struct w1_gpio_platform_data w1_gpio_pdata = {
  .pin    = S3C2410_GPF(0),
  .is_open_drain  = 1,
};</b>

We can notice that S3C2410_GPF(0) is going to be your 1-wire bus pin (

<b>
static struct platform_device s3c_device_w1 = {
  .name      = "w1-gpio",
  .id      = -1,
  .dev.platform_data  = &w1_gpio_pdata,
};</b>



Find and Modify the strcuture below and add last Line
static struct platform_device *mini2440_devices[] __initdata = {

         ....
<b>
  &s3c_device_w1
</b>
};

Then find and modify a last method aiming at initialize 1-wire bus pin
static void __init mini2440_machine_init(void)
{
#if defined (LCD_WIDTH)
  s3c24xx_fb_set_platdata(&mini2440_fb_info);
#endif
  s3c_i2c0_set_platdata(NULL);
  

<b>
  /* setup 1 wire pins */
  s3c2410_gpio_cfgpin(w1_gpio_pdata.pin, 1);
</b>
        .....





Now, you just have to compile your kernel and download it into your card.

Then, you'll just have to plug your ds18b20 to 3.3V Pin Gnd Pin and
GPF0/EINT0 Pin 9

Then go and navigate into /sys/bus/w1...as mentionned in your link...

Good luck

Peter 
@Phil

i want to control the outside- and water temperartur for my pool.
when sunshine and solar ist hotter than by poolwater, bypass the
filterwater over my solar with the solenoid valve.

when no sunshine, and water under 27°C, switch the heating pump on please.
and then logging of the the power meters of the heating pump.

why do you mind the micro is better for me,
the only difference i see is 2xDB9 and 3xUSB-A Host more.

@Sebastien 

thx a lot for the info! then the 1-wire is no problem any more.

@Tommy 
no i dont, can i buy it anywhere?

####

ok 1-wire is solved for my understandings.

relays? i saw a lot of stuff over usb etc.. on the internet/youtube.

what will be the best bet for my little projekt, 1x24V and 2x230V to
manage?

what hardware do i need for the relays on the mini/micro 2440?
a link or pic would be nice, so a elecric noob understand things a bit
better.

how do i connect the relays, 
over usb,rs232,40 pin System Bus, 34 pin GPIO, 10 pin Buttons ??

when i know what i all need for this on the 2440, i can order my board and
hardware etc..

i got a friend who is a electric engineer, he help me afterwords with the
soldering and resistors and transistor stuff.

for the power meters with s0 interface i need a digital input where i can
count the impulse on the interface.
can i do that with the 1x A/D pot?

thx
peter

Peter 
@Sebastien

putting some 1-wire drivers in your kernel is ok

musst i always patch the kernel to use some of the gpoi on this board?

the relays is also connected over the gpioīs
do i also have to patch the kernel again to use the gpois?

i thought linux recognised all the onboard stuff(232/usb etc..) by booting.

i donīt understand a lot of patching/writing driver for the kernel/board.

i also donīt find a lot of infos on the web about all this stuff.
mini2440 and 1-wire results in almost nothing.

i am affraid that i stand there and dont get things running.

donīt want to write programm etc. in C,
just want to use a view bash/perl scripts over cron to get things going.

thanks
peter

MikeB 
For my ac pumps i am using this for a relay.

http://www.mpja.com/prodinfo.asp?number=17157+RL

3v-30v switching 480v40a

i have it running a 120v1.5a pump. Works great!!!

I cannot wait to recompile the kernel with 1-wire built in. Thanks for the
info.

MikeB 
ps for 220 buy two relays and control them both with same i/o.

Peter 
hi mike

thx for the link!

itīs sorry to see that such nice infos like the patch for 1-wire,
stand somewhere in a forum in one of thousand other postings.

a good wiki with all this nice infos would be much better for all the
mini2440 owners.
we got a wiki on this site, why donīt they posted things like that over
there for the community, and some more howtos etc...

which linux do you use on your board?
how do you control your relay?

did you write something in C or something else?
did you need to patch the kernel to achieve that all for your relay?

i bought the board yesterday, shipping from china to germany take a coupple
op days :-(

greetings
Peter

Peter 
the postamn was there today with my board

i try to compile the kernel with the 1-wire patch from sebastian above,
but i am getting the following error


CC      arch/arm/mach-s3c2440/mach-mini2440.o
arch/arm/mach-s3c2440/mach-mini2440.c:294: error: variable 'w1_gpio_pdata'
has initializer but incomplete type
arch/arm/mach-s3c2440/mach-mini2440.c:295: error: unknown field 'pin'
specified in initializer
arch/arm/mach-s3c2440/mach-mini2440.c:295: warning: excess elements in
struct initializer
arch/arm/mach-s3c2440/mach-mini2440.c:295: warning: (near initialization
for 'w1_gpio_pdata')
arch/arm/mach-s3c2440/mach-mini2440.c:296: error: unknown field
'is_open_drain' specified in initializer
arch/arm/mach-s3c2440/mach-mini2440.c:296: warning: excess elements in
struct initializer
arch/arm/mach-s3c2440/mach-mini2440.c:296: warning: (near initialization
for 'w1_gpio_pdata')
arch/arm/mach-s3c2440/mach-mini2440.c: In function 'mini2440_init':
arch/arm/mach-s3c2440/mach-mini2440.c:809: error: invalid use of undefined
type 'struct w1_gpio_platform_data'
make[1]: *** [arch/arm/mach-s3c2440/mach-mini2440.o] Fehler 1

################################################################

i put this in the arch/arm/mach-s3c2440/mach-mini2440.c file,
highlite my input with ## here in forum, in file without ;)

############################# lets go ######################### 

                                   S3C2410_LCDCON5_INVVLINE |
                                   S3C2410_LCDCON5_INVVFRAME |
                                   S3C2410_LCDCON5_PWREN),
        },
};
################################ edit begin #########################
static struct w1_gpio_platform_data w1_gpio_pdata = {
        .pin            = S3C2410_GPF(0),
        .is_open_drain  = 1,
        };
static struct platform_device s3c_device_w1 = {
        .name                   = "w1-gpio",
        .id                     = -1,
        .dev.platform_data      = &w1_gpio_pdata,
        };
################################ edit stop #########################
/* todo - put into gpio header */

#define S3C2410_GPCCON_MASK(x)  (3 << ((x) * 2))
#define S3C2410_GPDCON_MASK(x)  (3 << ((x) * 2))

static struct s3c2410fb_mach_info mini2440_fb_info __initdata = {





#########################
#########################
and lower somewhere this
#########################
#########################

static struct platform_device *mini2440_devices[] = {
        &s3c_device_usb,
        &s3c_device_wdt,
/*      &s3c_device_adc,*/ /* ADC doesn't like living with touchscreen ! */
        &s3c_device_i2c0,
        &s3c_device_rtc,
        &s3c_device_usbgadget,
        &mini2440_device_eth,
        &mini2440_led1,
        &mini2440_led2,
        &mini2440_led3,
        &mini2440_led4,
        &mini2440_button_device,
        &s3c_device_nand,
        &s3c_device_sdi,
        &s3c_device_iis,
###############edit#####################
        &s3c_device_w1,
###############edit#####################
        &mini2440_audio,
/*      &s3c_device_timer[0],*/ /* buzzer pwm, no API for it */
        /* remaining devices are optional */
};



#########################
#########################
and lower somewhere this
#########################
#########################

        }
        s3c24xx_udc_set_platdata(&mini2440_udc_cfg);
        s3c_i2c0_set_platdata(NULL);
###########################edit#####################
        s3c2410_gpio_cfgpin(w1_gpio_pdata.pin, 1);
############################edit#####################
        i2c_register_board_info(0, mini2440_i2c_devs,
                                ARRAY_SIZE(mini2440_i2c_devs));

#ifdef CONFIG_TOUCHSCREEN_S3C2410
        if (features.done & FEATURE_TOUCH)
                set_s3c2410ts_info(&mini2440_ts_cfg);
#endif


#########################
#########################

where or what did i do wrong, anybody shin a lite on this for me please.

greetings
Peter

dm9 
#include <linux/w1-gpio.h>

Peter 
thank you, worked!

still have to learn a lot ;-)

greetings
Peter

Rudolf 
Hi Peter

Very interesting, I am actually working on the same Project. :-)

Got my system up and running, temperature sensors working fine.

See you are also from Germany, maybe we can get in contact,
or share our Information here with each other.

Regards
Rudolf

aong 
Hi 

after i modify mach-s3c2440

than i run make at /linux-2.6.32.2

I get  mac-mini2440.o

what should i do after i got this file?

rudolf 
you must build your new kernel (uImage)
and load in to your boot partition on your device or sdcard,
depends how you handlet it.

greetings
rudolf

Mark 
did you get it working?
Thanks
Mark

Screwface 
Hi,

I managed to get the DS18B20 working with the above mach-mini2440.c
modification and kernel drivers activation.
When processing to cat /sys/bus/devices/18.xxxxxx/w1_slave, I get correctly
the answer

49 01 4b 46 7f ff 07 10 f6 : crc=f6 YES
49 01 4b 46 7f ff 07 10 f6 t=20562

Now, I would like to get the temperature in a C program and I'm a bit
stuck. Should execute the cat command from my C program, then parse the
answer to isolate the "YES" and the "20562" ?

I have googled a bit, and I found OWFS. What's the use of this if the
kernel already does the virtual file system? Should I use it with 1-wire
driver only and not thermal driver?

Thanks

Murderer 
#include <stdio.h>
#include <stdlib.h>




int main()
{
 FILE *fdt;
  fdt = fopen("w1_slave","r");
  char str[20];
  char str2[20];
  fscanf(fdt,"%*[^=],%*s=%*s%*s");
  fscanf(fdt,"=%*s%s",str);
  fscanf(fdt,"%*[^=],%*s");
  fscanf(fdt,"=%s",str2);
  printf("str=%s,str2=%s",str,str2);

sleep(1000);
}

gunner 
hello,

I tried these modifications on the mini6410, ofcourse I modified the code
 to say S3C64XX and it compiles fine. However my DS18B20s sensor is not
recognized, under /sys/bus/w1/devices I only find W1 bus master.

I tried using ports GPE1 and GPM0 but get the same result.

when i do a "dmesg | grep 1-wire" the output is as follows:
Driver for 1-wire Dallas network protocol.
however neither W1 nor W1-gpio give any output (not loading?)

Is there anything I'm missing or is the fact the touchscreen on the 
mini6410 is also 1-wire makes that no other pins can be configure to use 
1-wire?

kind regards

BaHko 
Great tutorial and it is compiling with no problem... 
Just don't forget to add 

#include <linux/w1-gpio.h> 


at the begging of 

linux-2.6.32.2/arch/arm/mach-s3c2440/mac-mini2440.c

Jekl 
Hi! Done all of the above for Tiny6410 (including differences from
mini2440). Chose the pin, which is connected to the internal sensor module.
Works it good. Thank you!
Q: How to make so that I can connect multiple lines 1-wire (on different
pins)? That line, and not the sensors to the same line.