Shift register control with STM32 HAL Drivers

A little program to control leds brightness through multichannel PWM over SPI with a STM32F103 microcontroller using HAL Drivers

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I always wanted to build a led cube, but I never gave me the time to analize and code it. Recently, I was playing with ARM microcontrollers and I want to apply these little knowledge in order to build a decent led cube.
The first step is to figure out how to control several leds with few pins and in a effective way. shift register are a very good option because they are cheap and almost available everywhere.
In this project I will attempt to develop a base for controlling the brightness of a group of leds using the popular 74HC595 serial in - parallel out shift register.

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