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We had run our STM32F207 Hardware over night with a battery. Now the battery is empty and we can't flash the STM32F207 with Ulink Me (of course with proper powersupply).
Ulink says: Error: Flash Download failed - "Cortex-M3"
We can check the RDP register: the value is 0xff so we are in RDP Level 1.
We try to flash the STM32F207 with the " erase full chip"-Option but Full Chip Erase failed. If we try to flash an other STM32F207-Hardware this works fine.
So we tried to flash \Keil\ARM\Boards\Keil\MCBSTM32F200\Blinky with OPTs set to Level 0 but we can't flash it.
So we have 2 Questíons
How is it posible that the Level change form 0 to 1 without any line of code to do this? How can we disable the Read Out Protection with Ulink Me?
I have installed the STM ST-LINK Utility Software.
It shows that Read Out Protection Level is set to 1. If I change it to 0 I get the message that the Option bytes could not set.
11:27:09 : ST-LINK SN : 48FF6A066765565147401467 11:27:09 : ST-LINK Firmware version : V2J23S4 11:27:09 : Connected via SWD. 11:27:09 : SWD Frequency = 4,0 MHz. 11:27:09 : Connection mode : Normal. 11:27:09 : Debug in Low Power mode enabled. 11:27:09 : Device ID:0x411 11:27:09 : Device family :STM32F2xx 11:27:09 : Can not read memory! Disable Read Out Protection and retry. 11:27:29 : Could not set Option bytes! Please reset the target and retry. 11:27:31 : Can not read memory! Disable Read Out Protection and retry.
"I get the message that the Option bytes could not set"
Can it do a full chip erase?
No it fails
Oh dear.
But you have now eliminate the Keil tools - so now time to speak to ST and/or your distributor FAE about this ...