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moisesesc

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  1. Like
    moisesesc got a reaction from un3x in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  2. Like
    moisesesc got a reaction from bwilson4web in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  3. Like
    moisesesc got a reaction from xpg in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  4. Like
    moisesesc got a reaction from enl in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  5. Like
    moisesesc got a reaction from chicken in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  6. Like
    moisesesc got a reaction from bluehash in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  7. Like
    moisesesc got a reaction from RobG in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    Hello forum members
     
    We have an update on the issues posted here.
     
    After reading all your great suggestions and going back 
     
    and trying to do as suggested, we finally after several hours
     
    of debug and test we were able to ping point the trouble piece of code.
     
    For the low temperature issues it turns out that our equation calculating
     
    fault temperatures was off by factor of 10 as a results when the temperature
     
    return back by ADC at temperatures below 0 was causing our equation to blow up
     
    and trick our code that a temperature fault had occurred on the board and PWM
     
    and motor needed to be shutdown.  Why we did not catch this before, was for two reasons
     
    1) I am a monkey, and failed miserably to code the right equation for the temperature fault.
     
    2) I fail to keep the temperature fault flag longer then a few seconds to allow me to see 
    what had cause the temperature fault.  Now I set up a sticky fault to allow me to see
    what had cause the temperature fault.
     
    Now I am doing more freezer testing and High temperature testing just to make sure I did not guff again.
     
    Thank you so much for all of you that took that time to respond and make great suggestions to try out
     
    and get to a resolution.
  8. Like
    moisesesc got a reaction from chicken in TIVA C Launch Pad Fails at below 0 C and above 40 C temperatures   
    chicken,
     
    great points. and by no means am I putting blame on TI, but the fact that they show little interest in helping us
    out directly other than suggesting the forums make me wonder about TI.
     
    Any how.
     
    Here are some details about your crystal stability concerns, which we had the same concerns and even though
    I did not mention this an my previous post, but we have run the firmware using the internal oscillator of the TIVA C pars
    which according to datasheet the internal crystal should be +- 3% through -40 to +85 temperature range with same results.
    The parts fail regardless we run it from external crystal or internal oscillator.
     
    +-3% clock variance should not cause PWM or ADC to drift so bad that it causes Motor to either stop or speed up.
     
    Now, we have spot tested the other components on our board and Launch Pad with Freezing spray while running to see if any other component when spot frozen cause the mention failures.
     
    The only one found to cause problems when expose to low or high temperatures was the TIVA C parts.
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