问题描述
我想在debian(Beaglebone Black)下使用spi eeprom(at25).我已经编辑了设备树，所以现在我可以读写eeprom了.
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.
Linux中已经有一个spi-at25驱动程序.
There is already a spi-at25-driver in Linux.
从eeprom读取
cat /sys/class/spi_master/spi1/spi1.o/eeprom
写给eeprom
echo hello > /sys/class/spi_master/spi1/spi1.o/eeprom
但是我想读写eeprom的特定地址.在C程序中有什么方法可以做到这一点?
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
推荐答案
由于此处的eeprom已映射到文件表示形式，因此您可以将其用作普通文件.
As the eeprom here is mapped to a file representation you can use it as a normal file.
因此只需open文件，转到要使用seek进行读取/修改/写入的位置，然后执行write.不要忘记close或flush作为文件ID.
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.
还可以将文件映射到进程的内存中，然后以普通数组的形式访问该内存.
It is also possible to mmap your file into your memory of the process and access the memory there as a normal array.
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