TS-4900 NVRAM

The RTC includes 128 bytes of NVRAM which can be used for custom applications. There is a utility, nvramctl which can be used to read/write the NVRAM.

ts4900-utils github.

This code can be included in your c/c++ application, or compiled as a standalone utility for access through other languages. The utility reads/writes a byte at a time, and returns the value in hex.

nvramctl --addr 10 --set 0x40
nvramctl --addr 10 --get
# Returns "nvram10=0x40".
# This can also be used with eval
eval $(nvramctl --addr 10 --get)
echo $nvram10
# Returns "0x40"

The NVRAM code can be included in your application by using these two files:

• nvram.c
• nvram.h