Hi Bas, I use NXP Kinetis KW2xd MCU and OpenOCD + JLink with SWD, for flashing.
I didn't know there were special procedures for unlocking devices. I'll try to use NXP official IDE flash these chips again. Thanks Olivier Le mer. 19 déc. 2018 à 08:17, Bas Stottelaar <[email protected]> a écrit : > Hi Oliever, > > Which MCUs have you been playing with? > > This is a common 'problem' that can occur when you indeed enable LPM (or > other things like disable debug pins etc). Therefore, most MCUs have > certain procedures to keep the MCU halted after a reset, before any code is > executed and the MCU gets unreachable. IIRC, ARM Cortex provides a > vector-catch operation to halt the MCU after reset. Some IDEs (like > Simplicity Studio for EFM32 MCUs) have a special unlock operation. > > Your solution isn't new, but works great to solve/work-around the problem > ;-) > > Kind regards > Bas Stottelaar > > > > Op wo 19 dec. 2018 om 08:08 schreef Olivier Fauchon < > [email protected]>: > >> >> Hi, >> >> I recently bricked a couple of MCUs playing with low power modes. >> I'm still not sure what happened, but enabling LPM on my board makes JTAG >> inoperant. >> >> I spent a lot of time trying to save these dead MCUs. >> >> To avoid this situation, I added some kind of recovery mode at boot : >> >> >> board.c >> >> void board_init(void) >> ... >> >> // Safeguard: Infinite loop if board started with buttons pushed >> gpio_init(BTN0_PIN, GPIO_IN_PU); >> gpio_init(BTN1_PIN, GPIO_IN_PU); >> if (!gpio_read(BTN0_PIN) || !gpio_read(BTN1_PIN) ) { >> gpio_set(LED0_PIN); >> gpio_set(LED1_PIN); >> while(1){} >> } >> >> Did I reinvent the wheel ? >> Do Riot have already mecanisms to delay boot , or other way to protect >> from bad images ? >> >> Thanks >> Olivier Fauchon >> >> >> >> >> >> >> _______________________________________________ >> users mailing list >> [email protected] >> https://lists.riot-os.org/mailman/listinfo/users >> > _______________________________________________ > users mailing list > [email protected] > https://lists.riot-os.org/mailman/listinfo/users >
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