问题
I want to use my spi eeprom (at25) under debian (Beaglebone Black). I have edited the device tree, so now i can read and write to eeprom.
There is already a spi-at25-driver in Linux.
Reading from eeprom
cat /sys/class/spi_master/spi1/spi1.o/eeprom
writing to eeprom
echo hello > /sys/class/spi_master/spi1/spi1.o/eeprom
But i want to write and read from specific address of the eeprom. Is there any way to do this within a C-Program?
thx
回答1:
As the eeprom here is mapped to a file representation you can use it as a normal file.
So simply open the file, go to the place where you want to read/modify/write with seek and do your write. Don't forget a close or flush for the file id.
It is also possible to mmap your file into your memory of the process and access the memory there as a normal array.
来源：https://stackoverflow.com/questions/26100105/read-and-write-to-spi-eeprom-on-linux