Define according the used Cortex core ARM_MATH_CM7, ARM_MATH_CM4, ARM_MATH_CM3, ARM_MA

ARM_MATH_CM7, ARM_MATH_CM4, ARM_MATH_CM3, and ARM_MATH_M0/M0+ are different Cortex cores used in ARM microcontrollers.

ARM_MATH_CM7 is a Cortex-M7 core, which is a high-performance core designed for complex signal processing and control applications. It has a single-precision floating-point unit and can perform up to two instructions per clock cycle.

ARM_MATH_CM4 is a Cortex-M4 core, which is also designed for signal processing and control applications. It has a single-precision floating-point unit and can perform up to two instructions per clock cycle.

ARM_MATH_CM3 is a Cortex-M3 core, which is designed for general-purpose microcontroller applications. It does not have a floating-point unit but can perform up to three instructions per clock cycle.

ARM_MATH_M0/M0+ are Cortex-M0/M0+ cores, which are designed for low-power and cost-sensitive applications. They do not have a floating-point unit and can perform up to one instruction per clock cycle.