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Recent content by musfiq

  1. M

    need uC/OS TCP-IP implementation source code and/or docs

    dear friends, i need uC/OS TCP-IP implementation source code and releated docs for educational purposes. please help me by sharing them. official link: h**p://micrium.com/products/tcp-ip/tcp-ip.html thanks in advance.
  2. M

    Need help on WiMAX base station design

    i need some information on designing WiMAX base controller software. what is the best place to start ? is it analyzing the standard or something else. any guidelines will be highly appreciated. fyi: we will use open source linux 2.6.18 kernel version. we have expertise on linux kernel and...
  3. M

    my sdcard can't finish writing

    friends, would u support me with the "SD Security Specification" and "SD File-system Specificatoin" for my project. i tried a lot to find out those docs but failed. without those 2 docs, i can't be able to finish my project. thanks a lot
  4. M

    my sdcard can't finish writing

    let me brief my design a little bit more... well, i am not using any kind of SDCard controller. i have built up a s/w layer which replaces the controller. i am just using the DM1AA-SF-PEJ connector to hold my sdcard. the pins CLK, CMD, DAT0, DAT1, DAT2, DAT3 are directly mapped to my GPIO...
  5. M

    my sdcard can't finish writing

    let me be more specific....i see the card going to PRG (programming state) and simultaneously the DAT0 is pulled LOW (indicates the card is busy) ... i wait for DAT0 line to become HIGH (after writing the card will pull it HIGH). unfortunately the card is pulling it LOW forever (i have waited...
  6. M

    my sdcard can't finish writing

    dear friends, i am having problems with writing a block of 512 bytes data to the sdcard. after i send 512 bytes of data and a 16-bit crc checksum, the sdcard sends back the crc status as 010 which means a crc ok, then it enters the PRG state with the DAT0 pin held at '0' by the card, which...
  7. M

    block read problem with sdcard (solved)

    Re: block read/write problem with sdcard i solved my problem myself. actually the DAT0 line was shared by some other bus. so, i was not getting proper voltage levels on the DAT0 pin. i had to disable that bus sharing. now i can read properly from the card. hope it would be helpful for others...
  8. M

    block read problem with sdcard (solved)

    friends, i am having severe problems with reading (and writing) from sdcard. i am using SD bus mode for communication with the sdcard and NOT using any sort of scard-controller for that. now i have successfully intialized the sdcard with ACMD41 (with OCR = 0x80FF8000 ), got the RCA and...
  9. M

    how to initialize sdcard ?

    i am working with SD mode i have successfully took the card to data TRAN state thank u very much
  10. M

    how to initialize sdcard ?

    let me be specific when i give CMD55, my sdcard responses successfully showing the card status which indicates the next it expects Application specific command. next when i give ACMD41 with the operation voltage range of 1.6 - 3.3, the card stops responding anything. (my board is using Vdd...
  11. M

    how to initialize sdcard ?

    dear friends, i have some problems with sdcard initialization phase. what is the actual (working) command-reponse sequence to get the sdcard through 'card identification phase' into 'data transfer phase' ? another...after issueing a read/write command, what is the command-response sequece to...
  12. M

    Question on CRC check in SD Card

    hello friends, i am working on a project where we are using the SD card with SD bus mode i have 3 questions regarding to CRC checking 1. Let i am reading a Data block of 512 bytes. It starts with a startbit (0) and then 512 bytes comes in sequence. Now, is the CRC16 check over the block...
  13. M

    equipments and books for an embedded systems lab

    embedded design with pic18f452 microcontroller hello friends, i am from BD. the CSE dept. in our university is thinking to setup an embedded systems lab. But we have lack of information on the necessary/essential equipments/books and others (even i may not know) to run such a lab. So i turn...

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