[2.0.x] M43 & LPC176x - the real fix (PR #13568 was wrong)

[Bob-the-Kuhn]

I got it wrong on PR #13568. M43's Toggle and Watch utilizes were not working because the PARSED_PIN_INDEX function was not handling the default conditions properly.

The PR #13568 changes have already been backed out.

PARSED_PIN_INDEX scans the command line for code and returns an index into the pin map. If the code is found and the pin is valid then the index for the pin is returned. It returns the default if the code is not found or the pin is not valid.

PARSED_PIN_INDEX changes:

• Adding -1 results in getting the default when the code is not present. const uint16_t val = (uint16_t)parser.intval(code, -1), port = val / 100, pin = val % 100;
• Changing to -1 results in getting the default value if an invalid pin is specified. return ind > -1 ? ind : dval;

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Additional changes were needed to make the M43 toggle utility work reliably with a LPC176x:

• Toggling the three USB pins causes hangs & disconnects. The M43_NEVER_TOUCH macro was added to cover this.
• Random hangs and disconnects were occurring when the WDT was enabled. WDT resets were added to minimize. this.

[hectori4502]

M43 Still halt the printer

[Bob-the-Kuhn]

@hectori4502 - sounds like you need to disable the WDT.

[hectori4502]

Thanks Bob-the-kuhn.
//#define USE_WATCHDOG
I will test.
Thanks.

[hectori4502]

I get Compile ERROR
can you tell me how to disable WDT.
thanks.

[thinkyhead]

Compile error is now patched.