ARM® Cortex® M4 Cookbook

Illustrating machine storage classes

This recipe illustrates a version of addTwoNums that uses the machine storage classes, int32_t and uint8_t. We explain why it is advantageous for embedded applications to define and use these as opposed to the primitive types that are provided by the C language.

How to do it…

To define and use machine storage classes, please follow the outlined steps:

1. Create a new folder named addTwoNums_v2 by cloning the previous project.
2. Copy the addTwoNums.c file from the previous recipe to the folder and modify it as follows:

   int main (void) { int32_t input; uint8_t num1, num2, res; HAL_Init (); /* Init Hardware Abstraction Layer */ SystemClock_Config (); /* Config Clocks */ SER_Init(); for (;;) { /* Loop forever */ printf("Enter ...