Hi I would like to run a function in microcontroller_1 in another microcontroller_2 is it possible? For example i want to execute this code in microcontroller_2 via microcontroller_1:
LPC_GPIO2->FIOSET=0xffffffff;
or for another example i want to ruuning this code from micro_1 to micro_2:
__disable_irq(); command[0] = 57; // Reinvoke ISP command iap_entry (command, result);
I mean i want to sent above code from micro_1 to micro_2 and expect to running this code in micro_2. Is it possible?
This is my own device but i forgot disable CRP3.Is there any solution to reinvoke ISP command?
The processor manual clearly states that:
This mode effectively disables ISP override using the P2.10 pin. It is up to the user’s application to provide for flash updates by using IAP calls or by reinvoking ISP via UART0.
What use would CRP3 be if there was a simple way to circumvent the protection?
How many companies would be willing to invest millions in in-house know-how into a broken NXP chip that would allow any willing student to extract the firmware and then send a request to some foreign country for a couple of hundred or thousand counterfeit units using stolen firmware?
What is your idea about Writing 0xffffffff in RAM location at 0x0000001F for breaking CRP2? Because in CRP2 we can write sectors. What is your idea?
First off: Address 0x0000001F is not RAM, so whatever you writes to RAM will not hurt the flash.
Next thing - only your already programmed firmware can write to RAM.
And it doesn't matter what you write to RAM - as long as it doesn't happen to be data that behaves like the required assembler instructions to do IAP or activate ISP. And even then it will not help you, unless your already existing firmware have a command to jump to these magic RAM bytes.
But since you are now talking about breaking CRP2 - which can be trivially broken by using ISP and request a full chip erase - it follows that you haven't accidentally locked up your own processor and want to get it erased so you can reprogram it with a better working program.
The only reason why you want to deactivate CRP2 without doing the trivial full-chip erase, is that you want to circumvent the code protection and extract the existing software. Which is a crime in (almost) all countries in the world. And in a lot of countries it is even criminal to debate different attack methods to try to circumvent copy protection.
So - why are you here asking for criminal help?
No I don't want to have criminal help just want to share our general information and also we can not erase a sector in CRP2 only can erase all of the chip NOT A SECTOR
Can you introduce me a good cross compiler for arm cortexM3?