topic Re: HW fix possible for Kwikstik v4 regarding SDHC? in Kinetis Microcontrollers

HW fix possible for Kwikstik v4 regarding SDHC?

thedannysmith — Sat, 07 Apr 2012 03:53:21 GMT

Hi,

Since the SD card connector's data pins (DATA0~DATA3) are connected to SDHC0_D4~SDHC0_D7 in HW rev 4 rendering it unusable, would it be possible to connect the MCU pins SDHC0_D4~SDHC0_D7 to SDHC0_D0~SDHC0_D3 physically with wires and thus enabling the SD card functionality? If so, would there be any implications?

Best Regards,

Danny

Re: HW fix possible for Kwikstik v4 regarding SDHC?

emh203 — Mon, 09 Apr 2012 20:39:24 GMT

Check out the BRTOS project. They got it to work by had to "bit bang" the interface.

Re: HW fix possible for Kwikstik v4 regarding SDHC?

mjbcswitzerland — Mon, 09 Apr 2012 22:58:45 GMT

As long as you have suitable tools for reworking the SD card connector and wiring the alternative signals it is possible to modify the board. However it is probably best to order a new one with V5 circuit if it is important to use SDHC (they are relatively inexpensive).

Also the uTasker project supports either SPI or SDHC interfaces to the SD card. By setting the define SD_CONTROLLER_AVAILABLE it will work on the Kwikstik v5 and by removing it it will work on the Kwikstik v4.

The same is in fact also true for the SD card slot on the Tower Kit TFT board, which is also not connected suitably for SDHC use.

The uTasker project includes its own FAT module and so doesn't use add-ons - this is fully documented here: http://www.utasker.com/docs/uTasker/uTasker_utFAT.PDF. This supports LFN but not writing (to avoid patent issues) but the next release will include LFN writing using the 'Linux work-around' to avoid potential infringements. It also allows the Kwikstik to be fully simulated, including the SD card (in SPI or SHDC modes :smileywink: - image below.

Regards

Mark

Re: HW fix possible for Kwikstik v4 regarding SDHC?

thedannysmith — Fri, 13 Apr 2012 17:07:02 GMT

Thanks for your advice! Will probably just buy a new kwikstik then.

Regards,

Danny