Wake up from deep sleep

lpcware — Thu, 16 Jun 2016 01:32:23 GMT

Content originally posted in LPCWare by mhjerde on Tue Dec 11 07:01:43 MST 2012
Hi
I have this weird behavior where I can put the mcu in sleep and wake it up with an interrupt on P2.10. But if I put it in deep sleep, it won't wake up.
The MCU is an LPC1756.

The only code change is adding the line

SCB->SCR = 0x4;

So this works:

LPC_SC->PCON = 0x00;
__WFI();

But it wont wake up after this:

SCB->SCR = 0x4;
LPC_SC->PCON = 0x00;
__WFI();

The code immediately following __WFI() restarts the MCU:

WDT_Init(WDT_CLKSRC_IRC, WDT_MODE_RESET);// Initialize WDT, IRC OSC, interrupt mode
WDT_Start(500000);// restart time in us (sec/1000000)
while(1); //infinite loop to wait chip reset from WDT

Any suggestions? If I assume the interrupt fires, so maybe the error is in the WDC restart code?
Morten

Re: Wake up from deep sleep

lpcware — Thu, 16 Jun 2016 01:32:23 GMT

Content originally posted in LPCWare by mhjerde on Tue Dec 11 07:44:31 MST 2012
SystemInit(); after __WFI did the trick.

topic Wake up from deep sleep in LPCXpresso IDE

Wake up from deep sleep

Re: Wake up from deep sleep