Hello ~
My STM32H743 MCU can not get into USB DFU mode, which has initial bootloader version V13.2
I follow the instruction, boot0 pin to high, plug usb, watching my device list, but there is no STM FS DFU device.
I designed new board with stm32h743xi, 16Mhz, 10pf, 0 ohm, 32.768KHz, 6pf,
There are BASE BOARD, and CPU Board, and did adjust impedance pairing USB_DM, USB_DP , all power managed by base board.
The base board also fit to commercial other MCU board(stm32h743xi, bootloader version V9.0)
Other Commercial CPU Board works well, I can see STM FD DFU device in the list
My question is
What cause this issue cannot get into USB DFU mode?
Bootloader version?, 13.2 version cannot get into USB DFU mode?
or HSE?, LSE?
or in the bootloader selection mechanism, my stm32h7 could select another boot mode like FD-CAN or I2Cx ?, or SPI detected?(CS PIN?)
should put all CS Pin to HIGH?
for more information.
- i can downlad the hex file to stm32h743 thru the st-link. also mcu look works fine, all led blink as I wanted...
- check the external clock HSE, 16Mhz,, my osilloscope show 16 Mhz wave pulse on resistor which is connected to xtal
- check the external clock LSE 32.768. that is sensitive, cannot measure it,,
- when i tried my stm32h743, USB DP showed the status like Not pull up, USB_DM showed only bottom level volage.
- I use STM32CubeProgrammer, to see memory, the bootloader version is located 0x1FF1E7FE, it was D2, (13.2)
I am having a so much headache.
plz help me
