running microSD card SPI clock at 30MHz hi, all the microSD card datasheets i can found online said it's max 25MHz for SPI.
I use UC3B at 60MHz to get 30MHz SPI.
Saturday, 9 January 2010 - 19:44
problem with FAT32 alloc 16KB sector segment in a new file ok, just found out that fs_g_seg.u32_size_or_pos do return 32. So fat_write_file() function was correct.
The problem is that my multiple block write function will stuck at 31st...
Saturday, 28 November 2009 - 14:36
AVR32 UC3A/UC3B SD Card Performance just did some test on the SDHC driver found from:
https://www.avrfreaks.net/index.p...
and also I included the ACMD23 before multiple block write.
The speed test on 4GB microSDHC...
Sunday, 1 November 2009 - 14:40
SD driver mod for SDHC - enjoy and also that the setting in conf_sd_mmc_spi.h:
#define SD_MMC_SPI_MASTER_SPEED 400000 // used during card init
#define SD_MMC_SPI_WRITE_SPEED 12000000 // used during...
Sunday, 1 November 2009 - 13:31
SD driver mod for SDHC - enjoy ok, just checked the wiki for max SPI speed for microSD card, it's 25MHz.
I also tried 30MHz SPI speed on a 8GB microSDHC card and a 4GB microSDHC card, both works.
Sunday, 1 November 2009 - 13:03
SD driver mod for SDHC - enjoy I just tested these codes, and also included my multiple block write function, and it works.
But now I want to test the max writing speed, and the code works at 24MHz SPI clock,...
How many decoupling capacitors for the AVR32UC3B0256? i suggest you go for as mush decoupling caps as you can have in your design.
In my design, with a 3.3V LDO and a 1.8V DC-DC step down, and with more than 10 caps around my MCU, i...
Sunday, 4 October 2009 - 20:55
AVR32 UC3A/UC3B SD Card Performance just did some test:
FAT with 32k format has writing speed on both 1GB and 2GB card similar compared with FAT format with default allocation size.
FAT32 with 16k or 32k format is...
hi, all the microSD card datasheets i can found online said it's max 25MHz for SPI. I use UC3B at 60MHz to get 30MHz SPI.
ok, just found out that fs_g_seg.u32_size_or_pos do return 32. So fat_write_file() function was correct. The problem is that my multiple block write function will stuck at 31st...
just did some test on the SDHC driver found from: https://www.avrfreaks.net/index.p... and also I included the ACMD23 before multiple block write. The speed test on 4GB microSDHC...
and also that the setting in conf_sd_mmc_spi.h: #define SD_MMC_SPI_MASTER_SPEED 400000 // used during card init #define SD_MMC_SPI_WRITE_SPEED 12000000 // used during...
ok, just checked the wiki for max SPI speed for microSD card, it's 25MHz. I also tried 30MHz SPI speed on a 8GB microSDHC card and a 4GB microSDHC card, both works.
I just tested these codes, and also included my multiple block write function, and it works. But now I want to test the max writing speed, and the code works at 24MHz SPI clock,...
https://www.avrfreaks.net/index.p... this might help.
I just found out my MCU start-up problem, it's because 3.3VIO must be on before 1.8Vcore.
i suggest you go for as mush decoupling caps as you can have in your design. In my design, with a 3.3V LDO and a 1.8V DC-DC step down, and with more than 10 caps around my MCU, i...
just did some test: FAT with 32k format has writing speed on both 1GB and 2GB card similar compared with FAT format with default allocation size. FAT32 with 16k or 32k format is...
nice, thanks!
ok, thanks for the info.
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