About christophkeiner9

christophkeiner9 · 2023-08-15

I use the USART1 on a STM32F103RB in half duplex RS485 configuration.My question is: how can i be shure, that the bus is idle?OK, i can see RXNE if a complete Byte was received, but if the USART is just receiving the bits and it has not reached the s...

christophkeiner9 · 2023-07-31

i have a question regarding the correct way of reading the timer counter registers.I learned not to read timer couter registers asynchronously, because it can lead to spourious wrong values if i read just when the timer changes it's value.In several ...

christophkeiner9 · 2020-11-06

I had an issue with a STM32F103RB connected to a poor Power Supply with slow Ramp-Up.In this case, the CAN Peripheral was not correctly initialized. After adding an external Voltage supervisor the Issue dissapeared. My question: is it also possible t...

christophkeiner9 · 2019-10-18

I configured a Project with STM32CubeMX 5.3 for STM32F042. Using Nucleo-Board witch Jumpering for MCO from STLink..The 1ms Timer works fine when using HAL for RCC, but it goes double Speed when changing RCC to LL. I have to limit Codesize for a Boot...

christophkeiner9 · 2019-10-10

I wanted to use the CAN Legacy Driver like i did it in my old STM32F103 Project (Same Cube Version. latest Firmware) but i failed.I copied the Legacy CAN-Module to the Driver Source-Path, the Legacy Include's were already included.But what should i d...

christophkeiner9 · 2023-08-15

Thank you for your Reply.I use Modbus RTU, but i usually like to check things that can go wrong as far as i can.

christophkeiner9 · 2023-08-15

No, it's not 30 years ago ;).It had this issue with a msp430x2xx, you can choose stopping or majority vote:

christophkeiner9 · 2023-08-02

I try to define wrong value:if i read a register that is just changing it's value due to a clock event, then it is not clear to me, that the value is OK, because the bits don't change all at the same time.assume change from 0x00FF to 0x0100. In this ...

christophkeiner9 · 2020-03-20

Hi Paul, at 125kbs it may work at room temperature because the HSI has app. +1.5% to -1% accuracy after soldering (Page 65 of the Datasheet). A collegue also made a design with internal Oszillator and he found also that 125k is the maximum Baudrate. ...

christophkeiner9 · 2020-02-10

Hi Karl, yes i see, the oscillator is synchronized to USB Data Stream, therefore it is sufficient accurate also for higher CAN Datarates. I never used the USB-Device but it's an nice feature.

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USART1: is it busy receiving?

Correct way to read timer counter register

STM32F103RB Reset IC neccessary?

Double Speed Systick STM32F042

CAN Legacy with STM32F042, STM32Cube Version 5.3.0, FW V1.10.

Re: USART1: is it busy receiving?

Re: Correct way to read timer counter register

Re: Correct way to read timer counter register

Re: CAN Legacy with STM32F042, STM32Cube Version 5.3.0, FW V1.10.

Re: CAN Legacy with STM32F042, STM32Cube Version 5.3.0, FW V1.10.