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energia / Energia

Fork of Arduino for the Texas Instruments LaunchPad's
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using Wire.setModule() with a value greater than 3 will "soft-brick" the board #963

Closed jstamour802 closed 7 years ago

jstamour802 commented 7 years ago

I am expecting the ability to use all of the i2c modules on the TM4C1294, but when I enter a Wire.setModule(n) greater than 3 the board becomes unresponsive. I can then no longer program any other sketches onto the board until I run the LM Flash Tool debug port unlock.

Wire.setModule(0) thru 3 do not cause this problem.

steps to reproduce the problem:

Setup a program to blink an led. Use wire.setModule(0) & wire.Begin and the program will run as expected. Change wire.setModule to 4 or higher to break it.

note: you'll need lm flash tool and run the debug port unlock in order to program the launchpad again after breaking it.

rei-vilo commented 7 years ago

Energia implements 4 I²C ports on the TM4C, numbered 0 through 3.

So the valid values for Wire.setModule() are 0, 1, 2, and 3.

Please refer to the pins map.

jstamour802 commented 7 years ago

the TM4C1294 has 10 i2c ports. So it's not possible to address the 6 other i2c ports available?

rei-vilo commented 7 years ago

Energia implements 4 ports. Consider CCS instead.

robertinant commented 7 years ago

As @rei-vilo mentioned we currently only support 4 I2C ports and none of the other ports are currently accessible. With that said, it should not crash / brick when using a number higher than 3 in setModule. I'll look into this to try and figure out why it is crashing / bricking the chip.