Tim Kyle

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10 years, 3 months ago.

11u24 Program Stuck in Memory

I used the following code

Break Your MBED

#include "mbed.h"
 
InterruptIn wakeup(p14);
DigitalOut  led(LED1); 
 
// Pulled from mbed SDK sources but removed mbed_interface_disconnect() call
// since that would cause halt when it tried to disable the interface chip
// which isn't powered up when I am powering the device from VB.
void deepsleep(void) 
{
    // PCON[PD] set to deepsleep
    LPC_PMU->PCON = 0x1;
 
    // SRC[SLEEPDEEP] set to 1 = deep sleep
    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
 
    // Power up everything after powerdown
    LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
 
    // wait for interrupt
    __WFI();
}
 
static void dummyHandler(void)
{
    return;
}
 
int main ()
{
    wakeup.rise(&dummyHandler);  // Setup rising edge interrupt
 
    led = 1;
    while (1)
    {
        deepsleep();  // Deep sleep until external interrupt
        led = !led;
    }
}

I added the & to pass by reference to the dummy handler so that I could actually throw a little code in there. Guess what, now when I load new programs to my mbed they will stay on the drive, but the processor will only run this code. I have disconnected usb, pressed power button, etc. Any ideas?

1 Answer

Tim Kyle
poster
10 years, 3 months ago.

I am answering my own question. I did the reset described here. http://mbed.org/cookbook/Unbricking I had to do it when the processor was not asleep.

Accepted Answer