About Yang Yang

Yang Yang · 2024-06-23

Hello, ST expert STM32F407 is used for our custom design. And htim2 play the role of precise timing base.When htim2->Instance.CNT = xx is used for setting a new counter start value for timer2, it seems that the new counter value does not functions i...

Yang Yang · 2024-06-14

Hello, ST expertE.g. GPIO PD4 functions as falling edge interrupt pin on STM32F407. Before the falling edge this interrupt is disabled by HAL_NVIC_DisableIRQ(EXTI4_IRQn). What happened if HAL_NVIC_EnableIRQ(EXTI4_IRQn) is executed after the falling ...

Yang Yang · 2024-04-12

Hello, ST expert CubeMX generated software framework is used for our STM32U595VJT6 based hardware design. It works well but for the low start up time. It takes almost 1 second between 3.3V is stable and the flag GPIO turns high in MX_GPIO_Init. Is th...

Yang Yang · 2024-03-11

Hello, ST experts STM32U595VJT6 is used on our own HW design. There is external SD3.0 compliant level translator NVT4857UK to help to work on UHSI mode. Everything is fine when SDIO clock sets as 96MHz or lower. But when the SDIO clock is higher than...

Yang Yang · 2024-02-22

Hello ST experts I found the same problem as previous post https://community.st.com/t5/stm32-mcus-embedded-software/stm32f072xb-gpio-issue-usb-pins-do-not-work-as-gpio/m-p/151104#M8715 But for stm32u595, I can not find the similar register USB_CNTR...

Yang Yang · 2024-06-24

Hi, Barry Seems a very good idea, I will have a try later. Thank you very much. BRYang

Yang Yang · 2024-06-23

Hello, jan According to my measurement, it takes effect after about 4 micro seconds in the case of 8MHz CPU main frequency, 4MHz htim2 clock frequency. That means the next counter value appears 4 micro seconds later. I am not sure this is correct. Is...

Yang Yang · 2024-06-23

Hello, BarryWhit I am sorry for the unclear description. I am talking about the TIMx_CNT register. BRYang

Yang Yang · 2024-04-19

Hello, ASchaI am very appreciated for your help and quick reply. Sorry for the unclear discription, it is just a example, not really if(1). It is something like this if(condition == 1) {xxxx} else {xxxx}And at this time the condition is 1, so the el...

Yang Yang · 2024-04-19

Hello, AScha I did it as you said. There are some updates on this problem. When the else part code is removed, the start up time is very short. But when the else part which will never reach in this case is added, the start up time is about one second...

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what is the timing diagram about writing TIMx_CNT register

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Re: what is the timing diagram about writing TIMx_CNT register

Re: what is the timing diagram about writing TIMx_CNT register

Re: what is the timing diagram about writing TIMx_CNT register

Re: stm32u5 start up time too long

Re: stm32u5 start up time too long