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namaRyo  
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 More options Jun 14 2010, 11:29 pm
From: namaRyo <r.ikuy...@gmail.com>
Date: Mon, 14 Jun 2010 20:29:42 -0700 (PDT)
Local: Mon, Jun 14 2010 11:29 pm
Subject: sensor calibration file
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Hi, this is nama.

I made "sensors.default.so" for arm9 dev.board - Armadillo440 (http://
www.atmark-techno.com/products/armadillo/a440)
use I2C accelerometer and magnetic filed sensors. and calculate to
orientation.

I want to save sensor calibration data to internal file at
"sensors.c". and try, but, permission error occurred.

How can I write to internal file system from "sensors.default.so" ?

thanks,


 
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Deva R  
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 More options Jun 15 2010, 2:51 pm
From: Deva R <r.deva...@gmail.com>
Date: Wed, 16 Jun 2010 00:21:18 +0530
Local: Tues, Jun 15 2010 2:51 pm
Subject: Re: [android-porting] sensor calibration file
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There might be better ways, but to start with you can refer our sample debug
code, where we dump video frame data to files in filesystem.
http://git.omapzoom.org/?p=platform/hardware/ti/omap3.git;a=blob;f=li...

from native libraries, you can do file operations with below calls..
fopen(filepath)
fwrite()
fclose()

Also, you might want to make sure the filepath have write access for the
process (a simple `chmod 777 <filepath>` will suffice)

-Deva


 
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RYO IKUYAMA  
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 More options Jun 15 2010, 10:27 pm
From: RYO IKUYAMA <r.ikuy...@gmail.com>
Date: Wed, 16 Jun 2010 11:27:10 +0900
Local: Tues, Jun 15 2010 10:27 pm
Subject: Re: [android-porting] sensor calibration file
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Hi, Deva

Thanks advice and sample code.
Before, I used fputs() and fgets(). then, fputs() was not able to be
done though fgets() was able to be done. filepath permission is set to
777 beforehand.
Is the place of the folder path(.data/misc/cal/) bad? or  should I
use fwrite() ?
I try by using fwrite.

sensors.c (file write test)
------------
#define CALIBRATION_FILE        "/data/misc/cal/sensors.cal"

static native_handle_t* control__open_data_source(struct
sensors_control_context_t *dev)
{
        LOGD("control__open_data_source()");
        native_handle_t* handle;
        int fd = open_input(O_RDONLY);
        if (fd < 0) {
                return NULL;
        }

        handle = native_handle_create(1, 0);
        handle->data[0] = fd;

        LOGD("open calibration file '%s'",CALIBRATION_FILE);
        if ((fp = fopen(CALIBRATION_FILE, "rw")) == NULL) {
                LOGE("Couldn't open '%s'",CALIBRATION_FILE);
        } else {
                fputs("ABCDEFGHIJKLMN", fp);
                fclose(fp);
        }

        return handle;

}

--
nama


 
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Akash Choudhari  
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 More options Jun 16 2010, 8:41 am
From: Akash Choudhari <akas...@gmail.com>
Date: Wed, 16 Jun 2010 07:41:32 -0500
Local: Wed, Jun 16 2010 8:41 am
Subject: Re: [android-porting] sensor calibration file
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FWRITE should work in your case

- Akash


 
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Deva R  
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 More options Jun 16 2010, 4:01 pm
From: Deva R <r.deva...@gmail.com>
Date: Thu, 17 Jun 2010 01:31:04 +0530
Local: Wed, Jun 16 2010 4:01 pm
Subject: Re: [android-porting] sensor calibration file
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is fopen() successful or does it return errorcode?

>if ((fp = fopen(CALIBRATION_FILE, "rw")) == NULL) {

can you try fopen(CALIBRATION_FILE, "w+")?
i dont feel "rw" is right mode to pass..

-Deva


 
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RYO IKUYAMA  
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 More options Jun 16 2010, 9:54 pm
From: RYO IKUYAMA <r.ikuy...@gmail.com>
Date: Thu, 17 Jun 2010 10:54:15 +0900
Local: Wed, Jun 16 2010 9:54 pm
Subject: Re: [android-porting] sensor calibration file
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thanks Akash,

I have not tried it yet you off the schedule. I'll try today or tomorrow.

--
nama


 
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RYO IKUYAMA  
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 More options Jun 16 2010, 10:09 pm
From: RYO IKUYAMA <r.ikuy...@gmail.com>
Date: Thu, 17 Jun 2010 11:09:49 +0900
Local: Wed, Jun 16 2010 10:09 pm
Subject: Re: [android-porting] sensor calibration file
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Thank you Deva,

I'll try to fix it soon and report results again.

--
nama


 
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RYO IKUYAMA  
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 More options Jun 17 2010, 12:11 am
From: RYO IKUYAMA <r.ikuy...@gmail.com>
Date: Thu, 17 Jun 2010 13:11:51 +0900
Local: Thurs, Jun 17 2010 12:11 am
Subject: Re: [android-porting] sensor calibration file
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hi Deva,

I fixed fopen(filename, "rw") to fopen(filename, "w+").
then I can write to file.
simple mistake!! I am shame..

Thanks a lot.

--
nama


 
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