Hi,
Q1)Which IDE should be chosen for metering applications?
>>>>The project is based on IAR IDE. You can unzip it to a directory by double clicking the *PHMET_R4_0_1_IAR.exe
After unzipping, the directory will be generated:
C:\Freescale\KM256SW1PHMET_R4_0_1\build\iar_7_40\projects\1phmetFFT
You can use the IAR to load the project to IAR


Because my IAR license has expired, so I have error when I compile the project.
Q2)How to incorporate metering libs like Application note software into those selected IDE's?
>>>>The FFT library is dependent the compiler, we have three library format based on iar,armgcc(Keil tools) and gcc. I copy the table from an4255.pdf

Q3)Also, in DRM163's SW part,KM256SW1PHMET_R4_0_1_IAR.exe, I can see IAR Toolchain with number of math/frac/meterlibFFT files in it. How to start with it?
>>>>pls refer to Q1
Hope it is helpful
BR
XiangJun Rong