Electronic – Save data on sim card using micro-controller

data storageinterfacemicrocontrollersim

SIM cards come in various data capacities, from 8 KB to at least 256 KB. All allow a maximum of 250 contacts to be stored on the SIM,

Is it possible to save data (other then contacts) in sim card, interfacing it with micro-controller then transfer data from micro-controller to sim card?

Best Answer

Absolutely. Except I am not sure if you are referring to smart cards or mobile specific SIM cards.

Smart Cards are easy. They are like any other memory device.

If you need to access a SIM card from a mobile phone it can get a bit more difficult as it becomes carrier and phone vendor specific.

For mobile SIM cards, I found it easiest to use a GMS modem module. You can use the serial port of the µController to communicate with the GSM module.

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Electronic – Problems reading data from a microSD card

It turns out that I was reading the MBR, which is located at the address 0 on the SD card. To find the location of the boot sector, one needs to read the appropriate entry in the MBR. The entries start at the address 0x01be and are 16 bytes each. The point of interest in the entry lies at the offset 0x08, is 4 bytes long and is called an LBA. [Wikipedia] To get the address of the boot sector location, one would multiply the LBA by the size of a sector (512 bytes). [Microchip forum]

For example:

In the output above, the four entries look like this:

00 02 10 00 06 2f ef af 8d 00 00 00 73 0f 3a 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

As you can see, only one entry is used. The LBA in this case is 8d 00 00 00 and is in little-endian format, so in big-endian it would be 0x8d or 141 in decimal. Multiply this by 512 and you get 72192 (0x11a00). This is the address of the sector where the FAT starts.

Electronic – Maximum transfer rate of USB mass storage device using micro-controller

I have just implemented a FS usb connection on a STM32F3 (72Mhz). I dont' know for the HS rate, but about the number of cycle used by USB, I would say not so much.

I used an FSK algorithm which processed data all the time and take something like 75% of the CPU cycles, but the USB connection (VCP 115kbps) was ok and not disturb the algorithm, whithout DMA.

If you have the answer for the rate at HS speed, please post, it could interest me!

Seb.

Best Answer

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Electronic – Problems reading data from a microSD card

Electronic – Maximum transfer rate of USB mass storage device using micro-controller

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