Cortex m4 of vf61

Can we use LPCXpresso IDE for development of applications for CORTEX M4 core in vf61 along with free rtos.

Probably, yes, but we don’t have any specific configuration nor experience with it. In theory, Processor Expert would be better but Vybrid is kind of tricky as there aren’t really any out-of-the-box configuration files for that neither. As mentioned here we just use GCC which you may combine with Eclipse.