[grovelcd] Grovelcd does not work on K64

[cuiyanx]

Description

Grovelcd does not work on K64, no console log.

Test Code

/samples/I2C.js
/samples/GroveLCD.js
/tests/test-i2c.js
/tests/test-grovelcd.js
/tests/test-grovelcd-rgb-manual.js
/tests/test-grovelcd-ds-manual.js
/tests/test-grovelcd-cursor-manual.js

Steps to Reproduction

Actual Result

Does not work and no console log.

Expected Result

Work well.

Test Builds

Branch	Commit Id	Target Device	Test Date	Result
master	ddcbbb	K64	April 6, 2017	Fail

Additional Information

/tests/test-i2c.js:

/samples/I2C.js:

[qiaojingx]

This issue is probably caused by #954.
commit 9e12add failed
commit ed04317 pass

[grgustaf]

Yeah, that makes sense. We probably need to identify whether I2C is being used and if so, not pinmux those pins to GPIO.

[qiaojingx]

Verified with commit f8f9621 on k64f. This issue is not reproducible.