LPC1850 - soft reset - SPIFI Boot - KEIL UV5 RTX

[scotthudis]

My system is a LPC1850 with IDE KEIL UV5 RTX and I boot from SPIFI.  That being said I am trying to do a soft reboot.  My hardware is set and I do not have an external pull-up P2-7.   

I have tried;

    *(volatile unsigned int *)0x40043100 = 0x10400000; //memmap with boot ROM address
    *(volatile unsigned int *)0x40053100 =(1<<0); // Core reset

But I suspect since I don't have a pull up on P2-7 this will not work.

Do I need to update the OTP?  If so, I cant seem to find a function in the Keil IDE.  I sure could use your help!  Thanks.

Update:

I updated the OTP to boot SPIFI and it did not correct the problem.

[scotthudis]

Is there an ISP pin workaround?  Is there anyway to do a soft reset without pulling up the ISP pin? 

[jeremyzhou]

Hi Scott Hudis,
1） Is there an ISP pin workaround?  Is there anyway to do a soft reset without pulling up the ISP pin?
-- I'm afraid that these's no way to do that.
Hope this is clear.
Have a great day,
TIC

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[scotthudis]

The call to NVIC_SystemReset() brings no joy and according to the Errata it should not work.  I think the only way to get Core Reset to work is to pull P2.7 high which means a hardware change I am trying to avoid.  Does anyone have a work around?

[jeremyzhou]

Hi Scott Hudis,
I've illustrated the way to boot from the QSPI flash after resetting in the previous reply, and the 3.18 RESET.2 shows a workaround to software reset, in my opinion, it definitely can implement your purpose.
Have a great day,
TIC

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[scotthudis]

Jeremy,  I did try what you suggested a few different ways without success and then noted the errata that indicated that what was suggested will not work.  It is precisely what I am doing a Soft Reset.  Besides, in the table suggested, if the ISP is not pulled high the soft boot gets stuck in ISP mode (USART0) (see box below).  With P2-7 pulled high the 2 lines

    *(volatile unsigned int *)0x40043100 = 0x10400000; 
    *(volatile unsigned int *)0x40053100 =(1<<0);

work great.  I assure you "NVIC_SystemReset()" does not work even with P2-7 pulled high.  I have tried it multiple times with LPC1850.  What am I misunderstanding?  Is there a workaround?  Am I looking at the wrong bits of figure 11?

Regards,

Scott

[jeremyzhou]

Hi Scott Hudis,
According to 3.18 RESET.2 in errata, the following codes is the workaround to software reset, and your understand is correct.
*(volatile unsigned int *)0x40043100 = 0x10400000;
*(volatile unsigned int *)0x40053100 =(1<<0);
Have a great day,
TIC

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[jeremyzhou]

Hi Scott Hudis,
Thank you for your interest in NXP Semiconductor products and
the opportunity to serve you.
The Fig 11 demonstrates the boot process for parts without flash and according to the Fig 11, BOOT_SRC bits and boot pins both can force MCU to enter related ISP mode.
About generating a software reset, please call NVIC_SystemReset() instead of
    *(volatile unsigned int *)0x40043100 = 0x10400000; //memmap with boot ROM address
    *(volatile unsigned int *)0x40053100 =(1<<0); // Core reset

Hope it helps.
Have a great day,
TIC

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