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2014-01-13
, 22:27
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Joined on Feb 2010
@ Holland
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#2
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Also, GITHUB has this page
struct toh_eeprom_entry toh_eeprom[] = {
{ TOH_EEPROM_VENDOR, 2, 0 },
{ TOH_EEPROM_PRODUCT, 2, 2 },
{ TOH_EEPROM_REV, 1, 4 },
{ TOH_EEPROM_EEPROM_SIZE, 2, 5 },
{ TOH_EEPROM_CFG_ADDR, 2, 7 },
{ TOH_EEPROM_CFG_SIZE, 2, 9 },
{ TOH_EEPROM_UDATA_ADDR, 2, 11 },
{ TOH_EEPROM_UDATA_SIZE, 2, 13 },
};
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2014-01-14
, 06:12
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Community Council |
Posts: 4,920 |
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Joined on May 2012
@ Southerrn Finland
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#3
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Well, 256 bytes don't hold very impressive images or sounds. that's for sure 
I'd imagine what you can put there is an URL that gets downloaded by the system when you insert the EEPROM, for example. Now you'd need to write up a daemon that gets kicked when an EEPROM of the signature you have gets inserted to I2C...
Last edited by juiceme; 2014-01-14 at 06:12. Reason: corrected typo
I'd imagine what you can put there is an URL that gets downloaded by the system when you insert the EEPROM, for example. Now you'd need to write up a daemon that gets kicked when an EEPROM of the signature you have gets inserted to I2C...
Last edited by juiceme; 2014-01-14 at 06:12. Reason: corrected typo
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2014-01-14
, 06:57
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Joined on Jul 2010
@ Espoo, Finland
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#4
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Originally Posted by dirkvl
256 bytes is about same capacity of the NFC tags. If it's just to recognize the OH wouldn't be better to use those (and spare the energy to power the EEPROM) ?
An AT24C02 EEPROM with a wopping 256 bytes of data
Since EEPROMS are very very easy to program, this is a very quick way to make your custom OH instantly very awesome!
Otherwise, how does read/write cycles in NFS tags and EEPROMs compare, when they are used to periodically store temporary data?
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2014-01-14
, 07:59
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@ Espoo, Finland
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#5
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Remember that the VDD in toh is 3.3V, and I2C levels are 1.8V CMOS, so the EEPROM might not talk with you.
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2014-01-14
, 09:40
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#6
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Originally Posted by juiceme
Well no, that's why I said 'download' image
Well, 256 bytes don't hold very impressive images or sounds. that's for sure
Although there are also a lot bigger EEPROMS, I think its power is in simple commands.
Originally Posted by minimos
Stand-by current of eeprom = 8 micro-amps. Read/write is a bit higher, but write time is a few milliseconds. The thing is, EEPROMs are available and Jolla NFCtags are not. Also, when you are making a PCB for an OH, it is way easier to also put an EEPROM on there instead of also making an NFC tag.
how does read/write cycles in NFS tags and EEPROMs compare, when they are used to periodically store temporary data?
Originally Posted by kimmoli
I believe EEPROMS are designed with flexibility in mind, so I think this will be okay!
Remember that the VDD in toh is 3.3V, and I2C levels are 1.8V CMOS, so the EEPROM might not talk with you.
Originally Posted by juiceme
Ha! See this post. Thats the beauty, the phone automatically looks for it.
Now you'd need to write up a daemon that gets kicked when an EEPROM of the signature you have gets inserted to I2C...
Anyway, the question was not 'if' but 'how'! What kind of commands could you put on there?
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2014-01-14
, 11:02
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@ Espoo, Finland
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#7
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Originally Posted by dirkvl
you wish... with I2C, anything is possible, it is "standard", but implementations varies.
I believe EEPROMS are designed with flexibility in mind, so I think this will be okay!
VinHIlow = VCCx0.7V (aka CMOS) and when VCC is 3.3V, means that SDA/SCL needs to be ~2.3V to make sure them to be high.
(Ref AT24C02 datasheet)
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2014-01-14
, 14:51
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#8
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Okay, then i put an regulator in between that outputs 2 volt to the Vcc of the EEPROM, problem solved. At least for trial fase.
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2014-01-20
, 16:40
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#9
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In recent developments, the qwerty-oh is upgraded with a 1.8V voltage regulator, which mean I will very probably also stick an EEPROM on there.
Has anyone -by chance- come by some EEPROM commands for Sailfish?
Has anyone -by chance- come by some EEPROM commands for Sailfish?
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2014-01-20
, 17:09
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#10
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Originally Posted by dirkvl
you'll need to create that interface yourself
In recent developments, the qwerty-oh is upgraded with a 1.8V voltage regulator, which mean I will very probably also stick an EEPROM on there.
Has anyone -by chance- come by some EEPROM commands for Sailfish?
An eeprom is programmed by electric signals on designated addressbusses and will output whatever you put in their. Those instructions can then be used by microcontrollers, or TOH, interpreting the output.
http://www.engineersgarage.com/elect...s/24c02-eeprom
An AT24C02 EEPROM with a wopping 256 bytes of data
Since EEPROMS are very very easy to program, this is a very quick way to make your custom OH instantly very awesome!
But, since I am an extreme hardware guy (and a little low on software knowlegde), what to put on them??
Howto:
-download a picture and set it as ambiance?
-download and install a program?
-change settings?
-start a daemon?
Also, they are dirt-cheap.