About sheng yang

sheng yang · 2024-09-05

I made a project with stm32h7 board, and use pemicro multlink to debug it under keil. I found it keep in systick handler pending but no active.I checked systick module register as:the counter is changed.and then I checked SCB releate registers asand ...

sheng yang · 2024-07-29

I made a board with spi1 connect a lora module, and the nss pin, I just want to use soft control. But I found that before I enable spi1, the SPI CR1 and CR2 register value as: (gdb) x/2wx 0x40013000 0x40013000: 0x00000024 0x00000040 but afte...

sheng yang · 2024-07-25

I use stm32CubeMX to generate usb code with HSI clock.Though I can config with usb clock to 48MHz, But stm32CubeMX software display there is clock issue as below:So I wonder can stm32f103cbt6 usb work under HSI clock?

sheng yang · 2024-06-28

stm32f429 ran in PCLK2 with 160MHz, and TIM8 prescaler division set to 0, auto reload set to 1.set up interrupt enable.in TIM8 update interrupt handler, just toggle PD4 pin out.when use oscilloscope to check the wave of PD4, just get around 2.3MHz. C...

sheng yang · 2024-04-22

I want do design a board with stm32h7b0zbt6, I found there is a Evaluation board with STM32H7B3LI MCU, but I couldn't find the schematic file, I just find the user manual file with RM2662, I wonder is the schematic file is opensource ?

sheng yang · 2024-09-06

I'm sorry replay so late, later I found the reason is that I disabled irq before with.CPSID I

sheng yang · 2024-09-05

1. I have checked SysTick->CTRL = 0X7 so SysTick interrupt has beed enabled. 2. Execution cannot be in an equal or higher priority interrupt (print out SCB registers) I wonder which register do you mean ? and I have print these registers in the pict...

sheng yang · 2024-07-26

ok，I get it.thanks for your reply.

sheng yang · 2024-07-25

But today I found my board (I designed this to achive USB convert to LoRa) without HSE , and I use HSI to generate 48MHz clock to USB, the usb with this board can still be identified by PC.

sheng yang · 2024-06-30

I'm sorry reply so late. I wonder can PD4 associate with a PWM output?I just see PD4 alternate function as:

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User Activity

systick handler keep pending on stm32h7 board.

stm32f103cbt6 spi enable cause spi in slave mode

can stm32f103cbt6 usb work under HSI clock?

stm32f429 tim8 in up count mode, update interrupt couldn't generate 10Mhz PWM.

Evaluation board with STM32H7B3LI MCU schematic file

Re: systick handler keep pending on stm32h7 board.

Re: systick handler keep pending on stm32h7 board.

Re: can stm32f103cbt6 usb work under HSI clock?

Re: can stm32f103cbt6 usb work under HSI clock?

Re: stm32f429 tim8 in up count mode, update interrupt couldn't generate 10Mhz PWM.