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Hello, when am working with embedded c code i can see the error "cannot open source input file "xxxx.h", after 'build target'? How to include header files to this Programming ?
You haven't given much to go on, but the common reasons why a compiler - any compiler - can't open a header are:
1. The file does not exist (did you spell the name correctly?), or is inaccessible (eg, network problem or permissions);
2. The file does exist, but is not in a location where the compiler can find it.
You tell the compiler where to find headers by configuring the Include Paths
See: http://www.keil.com/support/man/docs/uv4/uv4_dg_adscc.htm
This is standard stuff - not specific to Keil or microcontrollers.