But as soon as you release the push button, LEDs turn off. When you press and hold the push button, all four LEDs turn on (green, yellow, red, and blue). This code controls on-board LEDs of the STM32F4 board with an onboard push button. You can read this guide on how to download and install keil MDK for ARM on your system: ![]() Therefore, you should have installed Keil uvision on your system. In this series of tutorials on the STM32F4 discovery board, we are using Keil uvision IDE and HAL drivers from STMicroelectronics to write programs for the STM32F4 discovery board.
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