Memory SD --> SDHC Implimentation

Started by Joey.G in comp.arch.embedded8 years ago 1 reply

Hi All, From my limited understanding the physical interface is the same between the SD and SDHC except the read/write speed is much...

Hi All, From my limited understanding the physical interface is the same between the SD and SDHC except the read/write speed is much faster... My ARM9 cpu has SD hardware ... but what is needed to impliment SDHC..... is extra hardware required or only software driver. Thanks in Advance Joe


SDHC questions

Started by analox in comp.arch.embedded9 years ago 3 replies

Hi there, I need the SDHC spec cause I got to adapt existing embedded code to support the HC cards. neither google nor Sandisk helped. Any...

Hi there, I need the SDHC spec cause I got to adapt existing embedded code to support the HC cards. neither google nor Sandisk helped. Any ideas where to get the spec from would be highly appreciated. Do ordinary built in SD card reads in laptops support SDHC? Is there anything out for cards beyond 32 GB ? tia w.b.


SDHC 4 bit driver?

Started by ded1...@iperbole.bo.it in comp.arch.embedded7 years ago 2 replies

Hello, I'm trying to add SDHC support to a STM32 4 bit mode driver (not SPI) which works fine with normal SD. Before ACMD41 I added CMD8...

Hello, I'm trying to add SDHC support to a STM32 4 bit mode driver (not SPI) which works fine with normal SD. Before ACMD41 I added CMD8 with 0x01AA as a parameter; the answer is the same (0x01AA) which is OK. In the following ACMD41 I set HSC bit (arg is 0x40000000), but in the STM32 SDIO controller the timeout flag is set. Did someone write a SDIO 4 bit driver for SDHC, please? ...


Dosfs and 8G SDHC card

Started by TonyDeng in comp.arch.embedded5 years ago 8 replies

Hi All, I am writing a data logging firmware using dosfs. The size of data I am logging is more than 10Meg. I tested the firmware with 2G SD...

Hi All, I am writing a data logging firmware using dosfs. The size of data I am logging is more than 10Meg. I tested the firmware with 2G SD card and 4G SDHC card. Both of these cards are working properly. When I put these cards into my PC I can read the filenames and creation dates. However, when I tested the same firmware against a 8G SDHC card, after logging about 1Meg of data, the DFS_Write...


SD snd SDHC card differences

Started by Joe G (Home) in comp.arch.embedded8 years ago 10 replies

Hi All, 1. I'd like the executive summary of the differences between the SD and SDHC memory interfaces. My assumptions the connection...

Hi All, 1. I'd like the executive summary of the differences between the SD and SDHC memory interfaces. My assumptions the connection interface is the same and the physical interface is the same except the speed and protocol. 2. microSD is the same as SD except the microSD is physically smaller. Any pointers would be appreciated. Thanks Joe


SD Voltages

Started by rickman in comp.arch.embedded6 years ago 1 reply

I am reading a CPU eval board data sheet that says it supports 1.8 volt interface for MMC cards. They don't seem to support SD cards. Looking...

I am reading a CPU eval board data sheet that says it supports 1.8 volt interface for MMC cards. They don't seem to support SD cards. Looking at wikipedia they say, "All SD card families initially use a 3.3-volt electrical interface. On command, SDHC and SDXC cards switch to 1.8-volt operation." How is that intended to work? I don't see the utility of requiring a voltage converter chip so ...


Password Protecting SD-Card Data

Started by benn in comp.arch.embedded8 years ago 1 reply

Anyone know how data on an "Secure" Digital Card can be secured? I'm designing an embedded arm-based board that uses a standard SD/SDHC Card...

Anyone know how data on an "Secure" Digital Card can be secured? I'm designing an embedded arm-based board that uses a standard SD/SDHC Card for storage, and I'd like to secure certain partitions by password protecting them from reading/writing. The only built-in protection I've been able to find is the SD Card's Content Protection for Recordable Media (CPRM). Apparently the use of th...


Micro SD card / MSP430 interface: write problem

Started by Christophe Braillon in comp.arch.embedded6 years ago 8 replies

Hi everyone, I have interfaced a Micro SD card to a MSP430 microcontroller using the SPI mode. Everything worked perfectly fine but I...

Hi everyone, I have interfaced a Micro SD card to a MSP430 microcontroller using the SPI mode. Everything worked perfectly fine but I recently had problems when writing too often into my files. Here is my setup. As I said the card (SDHC 4Go) is directly connected to the microcontroller via its USCI (SPI) peripheral. I have written the basic SD access (register read / write, basically...