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STM32H745ZI Power On Reset Problem issue,

JYoon.2
Associate II

i use CubeMX, CubeProgrammer, ST-LinkV3set, and IAR

i made my own Board, modifiy en.MB1363-H745ZIQ-C01_Schematic

ST-Link can recognize Device when Boot0 to High and PowerOnReset.

when Boot0 to Low and PowerOnReset can not recognize Device.

What can i debug??

Add

Boot0 to High and PowerOnReset State, I can download

Error Massage

"no MCU device found session aborted"

7 REPLIES 7
Uwe Bonnes
Principal III

Is some programm loaded? Does the programm remap JTAG/SWD pins? Try connect under reset!

swd : i didnt use remap function,

st-link : using Connect during reset

Boot1 to High before powerOnReset , i can program.. and it is located 0x800 0000

Boot0 to High before powerOnReset , i can program.. and it is located 0x800 0000

==miss typing

T J
Lead

the 4.7uF cap or 2x 2.2uF caps , on Vcap pins seems fairly critical.

do you have a reset chip ?

use a scope and check at high frequency, trigger on the power rail dip, slowly lower the trigger level, if its 0.5V below VCC that is your issue...

more bypass caps...

thanks for reply, i will check them.

i checked Vcap pin, it is 1.2V level

and use scope it looks fine...

Try doing some simple stuff in main(), without calling SystemConfig(), as I recall part should run at 64 MHz by default.

Toggle some GPIO, output via a USART.

Check HSE_VALUE matches board design.

If it doesn't get to main(), uncheck "run to main()" or equivalent setting, start stepping in Reset_Handler.

Have HardFault_Handler() and Error_Handler() report actionable data.

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