My first C project for an STM32F407 DISCOVERY board with a 32-bit Arm Cortex-M4 processor. Main functionality: turning on a LED.

The focus is on the file main.c which contains the practice I did during an embedded systems course for complete beginners (in C). The commits are thought as stages of the progress, so with each commit there is a small improvement or change of how the board works.

1. Hard-coded memory addresses and manipulating registers using bitwise operations and masks (no bit shifting). link to commit

   Registers used:

   • RCC_AHB1ENR for clock enable
   • GPIOx_MODER for mode
   • GPIOx_ODR for data output

2. Implementation of bit shifting. link to commit

3. Implementation of loop and delays to toggle LED. link to commit

4. LED toggle based on input reading. The input read checks if there is current or not. link to commit

   Register added:

   • GPIOx_IDR for input

STM32CubeIDE