Hi,I try to work with the JSN-SR04T distance sensor. The working principle is very simple :put the trigger pin to high for 10 uscount the elapsed time in us on the echo pin between the rising and falling eventdistance is proportional to the elapsed t...

HiI have a Clicker2 demo card (it is like a discovery card). I have a SD in SDIO 4 bits mode with DMA : no problem, work fine. I can read and write to it with the FatFS library.I want to access this card with the USB port. So I initialize the USB_OTG...

Hi,Sorry for my stupid question but I am always in doubt when I give the priority in the NVIC table for DMA, UART, SPI, Timer, ...Is there a rule like for example set all DMA at 0 ?How to know what peripherals must have the highest priority and how ...

Hi,I have two Nucleo F411 board. When I connect the board to the computer with the USB ST_Link, one automatically reset and the other no. I don't want that the board automatically reset. The HW configuration and program are exactly the same for the t...

HiTimer make me crazy !!!Is there a simple formula to compute prescaler and ARR for a defined Delay and Pulse ?I have a STM32F411 Nucleo at 100 MHz. For the Timer2, APB1 is at 50 MHz.I want a delay of 10 ms with a pulse of 50 us. ThanksLionelNote : w...