• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 79 subscribers
  • Views 1742 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430 interface to SDHC cards

Shanguo Lu
Intellectual 570 points

Hi,

Understand that there is AppNote on interface MMC/SD card to MSP430. And there are a few discussions on the implementations of SDHC interface on MSP430.

 

Thinking of integrating a SDHC to my MSP430 boards, and any kind soul to share if you have succeeded in doing this? Possible to share the codes.

 

Thank you very much!

 

  • 0
    Prodigy 120 points

    TI's appnote and associated code slaa281 will only work for MMC cards since you want to interface SDHC you should start by downloading specs of SDHC on SDA website. Sort out the difference in initialization routine for MMC and SDHC cards (some commands are different & sometimes extra commands are required) .

    Some SDHC cards donot even support SPI mode so make sure you have the right one. 

    The link below was a great help to me :

    http://elm-chan.org/docs/mmc/mmc_e.html

  • 0
    Guru 227245 points

    There aren’t many differences between standard and SDHC cards.

    Some fields in the information register have different meanings, as the SDHC card has more capacity than the original register fields can describe. Also, the read and write functions do no longer take a linear memory address as parameter, but rather a sector number of a 512 byte sector (pushing the addressable memory limit above 4GB)

    Also, IIRC, the cards require you to read the register with supported operating voltages before proceeding. A command the standard SD cards do not know. (or was it the XD cards?)

**Attention** This is a public forum