ringbuf put errors when running I2CBMP280.js and HeartRateDemo.js on A101

[qiaojingx]

Description

This is an regression issue and probably caused by #1542.ringbuf put errors prints when running HeartRateDemo.js and I2CBMP280.js on A101.

Test Code

HeartRateDemo.js; I2CBMP280.js

Steps to Reproduction

1. make JS=samples/I2CBMP280.js
2. make dfu

Actual Result

Expected Result

No error.

Test Builds

Branch	Commit Id	Target Device	Test Date	Result
master	a36b2c9 - cd3f44e	Arduino101	Oct 11, 2017	Fail
master	4b77505	Arduino101	Oct 11, 2017	Pass

Additional Information

[brianjjones]

Looks like the setInterval isn't finishing before it gets called again. I'll look to make sure there isn't a problem with callbacks. It may also be that 10 is too low a timer number.

[brianjjones]

Looks like callbacks are fine, the demo timer is just going faster than the callbacks can be handled - hence the error message. #1614 will fix this.

[qiaojingx]

Verified with commit cac4c3a + #1614. Error in I2CBMP280.js has been fixed. Could you change interval time in HeartRateDemo.js, too?

[grgustaf]

This seems to indicate we have a performance regression because we used to do this work in 10ms apparently and now it takes 200ms? Rather than mask the problem (:D) let's look into why. @brianjjones, could you try testing this just before and after #1542 to see if that's what caused the problem.

[grgustaf]

@brianjjones ping on this one, just note I don't think we're done here.

[jimmy-huang]

@cuiyanx is this still reproducible?

[cuiyanx]

@jimmy-huang Yes, this issue can be reproduced on both cases. And /samples/Stepper.js case looks like this issue. Log:

Stepper Motor sample...

554:(ERROR) 1 ringbuf put errors (last rval=-122)

554:(ERROR) 15 ringbuf put errors (last rval=-122)

554:(ERROR) 47 ringbuf put errors (last rval=-122)

554:(ERROR) 110 ringbuf put errors (last rval=-122)