STM32 MCUs Products

## preprocessor directive in STM32 eclipse doesn't work

I use this definition #define ITEM(A,B,C,D,E,F)   (((ulong32)##A## << 25) | ((ulong32)##B## << 20) | ((ulong32)##C## << 15) | ((ulong32)##D## << 10) | ((ulong32)##E## << 5) | ((ulong32)##F##))that "translate" any switch case block in a constantswitc...

looking for an open source STM32 Project to contribute to

Hi thereI am a senior Embedded developer. 1in order to maintain my technical knowledge, I would like to conribute an open source project. Have you got any suggestions?

SMBus communication between STM32 and BQ25700A(charger ic)

Hello,I am trying to do communication between Charger IC(BQ25700A) and STM32 controller by using I2C communication protocol.For taking the status of charging/discharging current of battery from charger ic,i have to configure registers in charger ic a...

STM32F7XX bootloader unable to erase.

Hello,We already have developed a USART boot-uploader for a project of ours, testing it on an STM32F7XX customized board. I can bring up the bootloader by init command ( 0x7F ) and get a response 0x79 ( ACK ). But an extended erase command fails to r...

Can the embedded (factory) IAP code be changed in the field? I need an I2C IAP for the STM32F302. Is there available code for the I2C IAP I could use for a start on my own bootloader?

When do we need to call Clean and Invalidate D Cache?

Hi everybody, this maybe a very simple question but it is complex to me.Are they only needed between DMA and Memory?If we have few buffers but they are same RAM, do we need to clean/invalidate before copy or read?If a buffer is located in uncache (by...

STM32H747I board how to program

Hello I just got a STM32H747I-DISCO board. I have no idea how to program it. I am using STM32Cube ide. When I use only CM4 main to led blink debugger gives error. When I write led blinking code to both CM4 main and CM7 main then this time debugger is...

I want to use the RS485 interface. How do I get the DE to toggle off? I have configured the USART to enable the DEM bit but the DE line stays high all the time. Do I have to toggle the DE line or is it ran by the uC?