About Rob Meades

Rob Meades · 2024-05-07

I'm trying to get SPI1 working on an STM32U575 (NUCLEO board), starting from a base of existing working STM32F4 LL API code, but have failed.I am running this on a NUCLEO-U575ZI-Q board, so MOSI on PA7 (D11), MISO on PA6 (D12), SCLK on PA5(D13) and w...

Rob Meades · 2024-04-26

I have LL-API based UART/USART code which runs on an STM32U575 (tested on a NUCLEO-U575ZI-Q board), no problem (@ 115200).I would like to move this code to the LPUART (pins D0/D1, PG8/PG7, of the board). However, I have failed; not even TX works (a ...

Rob Meades · 2024-04-25

Using the STM32CubeProgramer (v2.16 from a Windows 11 laptop) with my NUCLEO-U575ZI-Q board has, from this morning, resulted in only the response:UR connection mode is defined with the HWrst reset modeST-LINK SN : 003E004C3532510F31333430ST-LINK FW :...

Rob Meades · 2024-04-24

[This is a follow-up to https://community.st.com/t5/stm32-mcus-embedded-software/setting-up-clocks-on-stm32u5-nucleo-board-in-startup-assembler/m-p/665708#M47209]As discussed in the issue referenced above, we do quite a lot of work in C constructors ...

Rob Meades · 2024-04-23

We have code which performs quite a lot of operations in C constructors. This means that, with the standard STM32U5 startup code, execution of __libc_init_array takes around 10 seconds, which is undesirable, hence we would like to set up all of the ...

Rob Meades · 2024-05-09

Turns out I was falling foul of ye olde MODF problem: the SPI HW monitors the CS line (either HW, or SW if emulated) and, if it thinks it has been pulled low, it switches to slave mode and does not allow the PE bit to be set in CR1. In the code abov...

Rob Meades · 2024-05-08

One additional note on this: the code above works when you single step through the debugger. If you just let it run, it does not work: the LL_SPI_Enable() does not have the desired effect; if you stop it in the debugger after the code above and look...

Rob Meades · 2024-05-08

I switched to SPI3 to avoid the conflict with PB0 on the NUCLEO board and realised that, in the simple test code, I had not initialised the clocks to the GPIOs and after fixing that I do get proper SPI TX behaviour. This wouldn't have been a problem...

Rob Meades · 2024-05-07

In the end it needs to fit into the same structure, since the code has to support both, and 90% of it is the same: same SPI configuration, same GPIO configuration, and this is a simple polled, non-DMA'ed arrangement, so I can ignore much of the new s...

Rob Meades · 2024-05-07

The documentation says:> The spi_pclk clock signal feeds the peripheral bus interface. It must be active when accesses to the SPI registers are required.This is fine, I have this I think. Then it says:> When the SPI works as master, it needs spi_ker...

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SPI on STM32U575 (NUCLEO board)

STM32U575 LPUART: what am I missing?

NUCLEO-U575ZI-Q board "Error: No STM32 target found"

Best way to boost STM32U5 speed during libc init

Setting up clocks on STM32U5 (Nucleo board) in startup assembler

Re: SPI on STM32U575 (NUCLEO board)

Re: SPI on STM32U575 (NUCLEO board)

Re: SPI on STM32U575 (NUCLEO board)

Re: SPI on STM32U575 (NUCLEO board)

Re: SPI on STM32U575 (NUCLEO board)