VORAGO PEB1 - CMSIS Compatible Drivers; Using Preprocessor Directives

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VA41620/VA41630 Evaluation Board User’s Manual

V1.0

Figure 4 - Keil IDE project item management folder

The “common” group has files specific to the MCU. The “drivers” group has files for using the

peripheral modules of the VA416xx MCU. The “src” group has files unique for this project

including the main.c file. The “BSP/evk/src” has files associated with the EVK boards. The

“utils” group has Segger RTT support files and some redirect functions that allow peripherals

with multiple instances to use the same code.

6.2 CMSIS compatible driver

ARM has created the Cortex-M Software Interface Standard (CMSIS) to provide a basis for

structuring code such that it can be ported from one ARM based MCU to another. Details on

this standard can be found at: http://www.arm.com/products/processors/cortex-m/cortex-

microcontroller-software-interface-standard.php.

6.3 Preprocessor directives

For bigger projects, the use of preprocessor directives can allow different build options. The

below code snippet shows the “ifdef” preprocessor directive. If “GPIO_DRIVER” was defined,

the first portion of the snippet would be executed. If “GPIO_DRIVER” was not defined, the

“else” portion would be executed. FYI: The demonstration code does not utilize the

“GPIO_DRIVER”.