STM32 MCUs Products

Strange behavior when using QSPI free running clock mode on STM32H750

I'm currently troubleshooting a STM32H750 QSPI implementation, and wanted to check that the prescaler was running correctly. So, on page 892 of RM0433 it shows a feature in the QUADSPI CCR called FRCM (free running clock mode). The catch is none of t...

STM32H7 SPI low speed stabilization problem

I am communicating Nucleo H743 with several PN532s using SPI. I edited waveshare's stm32 codes, I didn't use DMA or interrupt. I am trying to reduce the SPI speed so that the reader can work when I extend the cable length. Since I could choose the SP...

K.I.S.S. STM32L0xx persistent storage / non-volatile memory

I need a to read and write a simple 16 bit user configuration value that's stored in non-volatile memory. The STM32L0xx is famously short on memory and as such bringing the entire HAL in is out of the question. It swells up the code space well beyond...

adc dma reading

I am using 6 channels adc with 46uSec sample rate. the reading is pretty good with dma. and I use TIMER trigger adc reading and get data from dma call back function. but every time I only get one sample for each channels, it is possible to set multip...

Hello! I m using uC STM32G491 and I want to use CH1 and CH2 from TIM1 for asymmetric PWM to command a H bridge. In RM says that I must use CH1 and CH3 (oc1refc and oc3refc) and nothing about CH1 and CH2. Can I use them?

How to access the 2KB user option bytes in H7

In the STM32H7 datasheets, page 23 (H750) or 26 (H743) - ST says the device has 2KB user option bytes flash area. Does anyone have idea if this is a typo? Or how to access this memory?If it really is there - it has a good potential to be used as conf...

SPI loopbacking not working

I am using nucle-h745ziq ,SPI1 as Full duplex master and SPI4 as Full duplex salve.And both have same freuncy 25MHZ .And spi1 prescalar is 2.But SPI4 is not start the communication.Both structure parameter are same.In spi.c libabry I am uing if(HAL_...

Is there a possibility of a mistake in stm32F4/7 reference manual About Encoder mode in Timer section?

We have three options to select encoder mode In SMS bits (Slave Mode Selection) of TIMx_SMCR register. Based on the description following each mode in this register, counter counts UP/Down on each TI2FP1/TI1FP2 edge based on the TI1FP2/TI2FP1 level o...