Using Core-Coupled Memory on STM32F303CC microcontrollers #STM32 #Microcontrollers
Stupid Products digs into the super fast Core-Coupled Memory available on STM32F303CC microcontrollers.
Sometimes vendors provide some very interesting features in their cores and in this post I will get down to the Core-Coupled Memory (CCM) that you can find in some STM32 MCUs. In this post I’ll use the STM32F303CC, as I’ve already have written a cmake template project for this here that I use for fast development and testing.
I’ll use the RobotDyn STM32-MINI (or black-pill) module. Well, don’t get confused, there are many different black-pill modules (some with an STM32F411, which I’ll use on a future stupid project). This beauty has 256KB flash, 40KB SRAM and 8KB of CCM RAM.
What is CCM?
It is used to execute critical routines or to access data.
It can be accessed by the CPU only. No DMA accesses are allowed.
This memory can be addressed at maximum system clock frequency
without wait state.
The CCM SRAM is typically used for real-time and computation intensive routines, like the following:
digital power conversion control loops (switch-mode power supplies, lighting)
field-oriented 3-phase motor control
real-time DSP (digital signal processing) task
You can use it to speed up any task you choose in your application.
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