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Help me analyze problems about the FATFS and STM32F4
http://forum.hobbycomponents.com/viewtopic.php?f=49&t=2179
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Author:  rala [ Tue Apr 18, 2017 10:08 am ]
Post subject:  Help me analyze problems about the FATFS and STM32F4

Hello,
Please help me analyze problems about the FATFS and STM32F4
I would like to realize the data which will record by TF, A frame of data which has 2048 bytes will be recorded every 20ms. The writing time of every frame of data can’t ever 20ms. Because of the data was found to be lose,I opened a timing counter to calculate time in the program. As a result, the biggest time arrived 200ms !! It’s so big ! Then I opened a relief area of 20 frames, but the data lost as normal.
The transmission mode of SDIO is DMA.
Didn’t the data write in ? How do you think about it?
The driving of SDIO is using atom.
The loss rate of data <=1%.
Please help me to find the reasons and measures,thank you in advance!

PS: the STM32F4's datasheet:http://www.kynix.com/uploadfiles/pdf65976/STM32F401CCU6.pdf

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