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MPS430F5529 Low Power Mode Hanging.

Kas Lewis
Expert 1740 points
Other Parts Discussed in Thread: CC3100

I am running a loop that is constantly reading from an I2C sensor. However after a long while I notice the system hangs. When I pause the code I see it is hanging just after going into LPM0. I have included a screenshot of the situation below. 

I ran three tests and found that the number of cycles differs significantly.

Test 1 - 836 cycles

Test 2 - 1892 cycles

Test 3 - 1002 cycles

One cycle is counted when the sensor has data to be read but, the sensor is polled between each full data read to see if data is available. There are approximately 44 reads per cycle and therefore 88 times the uC goes into LPM0 (once per write and once per read).

Any help in resolving this issue would be very much appreciated.

Thanks

Kas

  • 0
    Prodigy 20 points

    Make sure that the sleep mode that you have enabled can wake up after entering sleep mode. Also what wakes up the micro from sleep. Sounds like you are polling the value and are not interrupting the value. 

  • 0 in reply to daniel johnson2
    Expert 1740 points

    Hello Daniel, 

    The code I am using is based on TI's example code for Master Tx/Rx with an I2C device, if I remember correctly the example numbers are 8 and 10. I have not gone back to the basic code and tried letting it run for 2+ hours but I can maybe try that over the weekend. 

    Either Way seeing as it is a TI demo I would assume that the code should work 100%.

    Thanks

    Kas

  • 0 in reply to daniel johnson2
    Expert 1740 points

    Hello Daniel, 

    I am now not able to run the code at all as it always hangs at the low power section and does not wake up. I am starting to wonder if somehow the CC3100 code is interfering. Any help would be very much appreciated.

    Thanks

    Kas

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