PIC18F47K42 - Bootloader erases program flash and PIC resets

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Hot!PIC18F47K42 - Bootloader erases program flash and PIC resets

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Author Post Essentials Only Full Version
oliverb Super Member Total Posts : 285 Reward points : 0 Joined: 2009/02/16 13:12:38 Location: 0 Status: offline Re: PIC18F47K42 - Bootloader erases program flash and PIC resets 2020/06/08 01:36:46 (permalink) +1 (1) Is there any conflict between the resources (control registers) used for flash programming and the resources used for a pointer operation, particularly a pointer to ROM? I'm thinking of the table pointer and TBLPTRU specifically as the compiler may be assuming its value. #21
NorthGuy Super Member Total Posts : 6230 Reward points : 0 Joined: 2014/02/23 14:23:23 Location: Northern Canada Status: offline Re: PIC18F47K42 - Bootloader erases program flash and PIC resets 2020/06/08 06:52:11 (permalink) +1 (1) oliverb Is there any conflict between the resources (control registers) used for flash programming and the resources used for a pointer operation, particularly a pointer to ROM? I'm thinking of the table pointer and TBLPTRU specifically as the compiler may be assuming its value. Impossible. The OP said that he replaced writing NVMCON with NOP keeping everything else (which includes setting TBLPTRU) intact, and this cured the corruption. Must be something related to the actual erase process, but we will never know. Northern Software Inc #22

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oliverb

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Total Posts : 285
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Joined: 2009/02/16 13:12:38
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Re: PIC18F47K42 - Bootloader erases program flash and PIC resets 2020/06/08 01:36:46 (permalink)

+1 (1)

Is there any conflict between the resources (control registers) used for flash programming and the resources used for a pointer operation, particularly a pointer to ROM? I'm thinking of the table pointer and TBLPTRU specifically as the compiler may be assuming its value.

#21

NorthGuy

Super Member

Total Posts : 6230
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Joined: 2014/02/23 14:23:23
Location: Northern Canada
Status: offline

Re: PIC18F47K42 - Bootloader erases program flash and PIC resets 2020/06/08 06:52:11 (permalink)

+1 (1)

oliverb
Is there any conflict between the resources (control registers) used for flash programming and the resources used for a pointer operation, particularly a pointer to ROM? I'm thinking of the table pointer and TBLPTRU specifically as the compiler may be assuming its value.

Impossible. The OP said that he replaced writing NVMCON with NOP keeping everything else (which includes setting TBLPTRU) intact, and this cured the corruption. Must be something related to the actual erase process, but we will never know.

Northern Software Inc

#22

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