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Thread: Flash protection

  1. #1
    New Member New Member diego_ is on a distinguished road
    Join Date
    Sep 2018
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    Flash protection

    Hi everyone,

    I have several questions about flash protection.
    I flash the XMC4200 microcontroller with DAVE over JTAG which also allows me to debug my applications. I use the following code to protect global read/write flash content.

    Code:
    #include <DAVE.h>
    #include <stdlib.h>
    #include <XMC4200.h>
    #include <xmc_common.h>
    #include <xmc_scu.h>
    #include <xmc_flash.h>
    #include <xmc_gpio.h>
    
    uint8_t user = 0;
    uint32_t protection_mask = XMC_FLASH_PROTECTION_READ_GLOBAL;
    uint32_t password_0 = 0x0;
    uint32_t password_1 = 0x0;
    
    int main(void){
    
    	//##### SET UP #####
    	if ((XMC_FLASH_GetStatus() & XMC_FLASH_STATUS_PROTECTION_INSTALLED) == 0) {
    		XMC_FLASH_EraseUCB(XMC_FLASH_UCB0);
    		XMC_FLASH_InstallProtection(user, protection_mask, password_0, password_1);
    		XMC_FLASH_ConfirmProtection(user);
    	}
    	
    	// ... rest of my code
    }
    My first question is: Must I include the flash protection code in the same DAVE project as my application code? If I do so, the application works but it is not possible to flash any code again. This is obviously what I am looking for, but I also need to temporary disable protection (with correct passwords) to allow flashing new programs.
    The second one is: in this forum link: https://www.infineonforums.com/threa...onnect-anymore jferreira (an Infineon employee) suggest to implement a backdoor to disable protection. What exactly does he mean? Can I do it over JTAG?

    Thanks in advance
    Diego

  2. #2

    Infineon Employee
    Infineon Employee
    jferreira will become famous soon enough
    Join Date
    Oct 2012
    Posts
    599
    Hi,

    Have a look to the XMCLib example at XMCLib\examples\XMC4500\FLASH\FLASH_PROTECTION. It uses a shell which implements a command that allows to disable temporarily the flash protection.
    The way of disabling temporarily the flash protection are multiple, i.e. pin level at start up...
    Regards,
    Jesus
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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