在Linux上读写SPI eeprom [英] Read and write to spi eeprom on linux

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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