Post Created date
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,...
Sunday, 1 November 2009 - 12:54
Regarding SSC & DMA
https://www.avrfreaks.net/index.p... this might help.
Friday, 23 October 2009 - 19:55
How many decoupling capacitors for the AVR32UC3B0256?
I just found out my MCU start-up problem, it's because 3.3VIO must be on before 1.8Vcore.
Monday, 19 October 2009 - 15:31
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...
Saturday, 8 August 2009 - 09:07
AVR32 UC3A/UC3B SD Card Performance
nice, thanks!
Saturday, 8 August 2009 - 08:17
AVR32 UC3A/UC3B SD Card Performance
ok, thanks for the info.
Friday, 7 August 2009 - 18:05

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