About tarmasr

tarmasr · 2024-02-09

This is a request for clarification of the TUR (Time Unit Ratio) calculation in the TTCAN implementation of the FD-CAN peripheral that is part of STM32MP1xxx systems. Specifically: the TUR is composed of a numerator and a denominator, designated FDCA...

tarmasr · 2023-11-10

The LPTIM_TypeDef struct that is used throughout many of the HAL header files contains a few RESERVED fields that cover unused address offsets in the peripheral's memory map.The first of these, RESERVED1, is declared as uint16_t. I believe that this ...

tarmasr · 2023-10-24

With reference to RM0436, the STM32MP157 Reference Manual, revision 6.On pages 1066 and 1072 the schematic structures of a GPIO port are drawn (figures 119, 120, and 122). These all show an inverter circle on the gate of P-MOS output transistor and n...

tarmasr · 2023-09-13

The otherwise excellent STM32CubeMX tool has a bug in its Configuration Report output (reached via the File > Generate Report command). In the Peripherals and Middlewares Configuration section of the report, the left and right columns of the output a...

tarmasr · 2024-02-12

Hi @PatrickF ,Thanks for taking the trouble to answer my query.Yes, I agree with the theoretical value (15.999...) and I did see the examples, but I was wondering if any form of rounding or truncation takes place, particularly since this combination ...

tarmasr · 2023-11-10

@Pavel A.: I noticed it by inspection while working on an STM32MP157 project. I was trying to understand some third-party code and the uint16_t just jumped out.And no, I was using the default compiler settings, no special packing options.I mentioned ...

tarmasr · 2023-11-10

@STTwo-32 : It happens in all the STM32CubeMX-related header files that define the LPTIM_TypeDef, for all STM32MP1xx MPUs and MCU that contain an LPTIM peripheral.There are too many different header files to enumerate individually; I suggest that yo...

tarmasr · 2023-11-10

Thanks @STTwo-32 The reason that this wasn't noticed before is probably because the C compiler will insert its own invisible 2-byte padding right after RESERVED1 to ensure that the next uint32_t data member is 4-byte aligned.

tarmasr · 2023-10-26

Thanks @PatrickF Understood; I stand corrected. I am used to arrows to indicate the P-ness or N-ness of transistors, but you are right: in the absence of arrows a small circle on the gate designates the P-MOS.

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TTCAN TUR division: rounding or truncating?

LPTIM_TypeDef contains incorrectly sized field uint16_t RESERVED1

GPIO port documentation query: P-MOS is shown inverted but is active high, and vice versa for N-MOS

STM32CubeMX and STM32CubeIDE configuration report output: configuration columns are reversed

Re: TTCAN TUR division: rounding or truncating?

Re: LPTIM_TypeDef contains incorrectly sized field uint16_t RESERVED1

Re: LPTIM_TypeDef contains incorrectly sized field uint16_t RESERVED1

Re: LPTIM_TypeDef contains incorrectly sized field uint16_t RESERVED1

Re: GPIO port documentation query: P-MOS is shown inverted but is active high, and vice versa for N-