(STM32H735) Problem flashing, no contact to µC while BOOT0=GND
Hello,
I have problems with a Custum board with a STM32H735IGK6 controller. I can flash a firmware once, after that I have no connection to the microcontroller and the software does not want to start.
Problem description:
BOOT0 = VDD
--> Microcontroller is recognized by STM32CubeProgrammer, STM32CubeIDE flashes firmware and then loses contact to the controller. The microcontroller does not start the user program (which was tested successfully on a STM32G431: LED flashing, otherwise no further commands).
BOOT0 = GND
--> Microcontroller not recognized neither by STM32CubeProgrammer nor by STM32CubeIDE. Exception: Previous Mass Erase with BOOT0 = VDD, disconnect from power supply, BOOT0 = GND, switch power supply on again)
I have already applied some solutions from this forum:
- Mass Erase with the STM32CubeProgrammer.
- ST-Link ISOL replaced by ST-Link
- When flashing the option "Shared Programmer" selected
- Flash speed lowered
Furthermore I have the log file of the STM32CubeIDE:
[3.435] spawnCubeProgrammer():
[3.435] spawnCubeProgrammer(): 14:58:31:695 Download verified successfully.
[3.435] spawnCubeProgrammer(): 14:58:31:695
[3,435] spawnCubeProgrammer():
[3.435] spawnCubeProgrammer(): 14:58:31:705 Disconnected
[3,435] spawnCubeProgrammer(): ------ Switching context -----
[3.438] Device_Initialise(): COM frequency = 4000 kHz
[3.439] Device_Initialise(): Target connection mode: Default
[3.446] readFromTarget(): Reading ROM table for AP 0 @0xe00fefd0
[3.448] reset_hw_wtchpt_module(): Hardware watchpoint supported by the target
[3.451] Device_Initialise(): ST-LINK firmware version : V2J41S7
[3.451] Device_Initialise(): Device ID: 0x483
[3.451] Device_Initialise(): PC: 0x8000634
[3.452] Device_Initialise(): ST-LINK detects target voltage = 3.02 V
[3.452] Device_Initialise(): ST-LINK device status: HALT_MODE
[3.452] initServerContext(): ST-LINK device initialization OK
[3.452] write(): <7> Tx: $OK#9a
[3.452] read(): <7> Rx: $Pf=34060008#88
[3.453] write(): <7> Tx: $OK#9a
[3.454] read(): <7> Rx: $vCont;c#a8
[3.460] handle_vCont_c(): handle_vCont_c, Failed continue thread
[3.460] write(): <7> Tx: $E31#a9
[3.460] read(): <7> Rx: $D#44
[3.462] handlePacket(): Error in executing 'detach' command ...
[3.462] write(): <7> Tx: $E31#a9
[3.462] stop(): Stopping port 61235
[3.522] WaitConnection(): Received stop for port 61235, not accepting new connections.
I have the feeling that the controller hangs after flashing the firmware, or does not start properly.
The hardware looks like this:
BOOT0 is selectable with a jumper.
PDR is set with 0R resistors. Currently PDR = VDD.
VDDA and VREF+ are connected to 3.3V.
The rest of the supply is external according to the data sheet.
I have tried all my ideas and I'm afraid that I can't solve the problem alone. Thanks for all suggestions in advance
