• State
  • Locked Locked
  • Replies 10 replies
  • Subscribers 57 subscribers
  • Views 1164 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Z Stack EXP4538 2.5.1 Generic App Delay between two packets

yuvraj sahni
Expert 1045 points

Other Parts Discussed in Thread: MSP430F5438, CC2520, MSP430F5438A

Hi,

I am using MSP430F5438 experimenter board and CC2520 transceiver as coordinator and end device.

I am using Generic app for sending the analog data after passing through ADC of msp430f5438a controller. 

The setup is working fine when I set GENERICAPP_SEND_MSG_TIMEOUT in GenericApp.h to more than 150. The default value for that was 5000 and I changed it to 150. I am currently sending 80 bytes of data.

Whenever I change the value of GENERICAPP_SEND_MSG_TIMEOUT  to any value lower than 150 the system does not respond correctly  By incorrect  respond I mean that the values do not come continuously.  I keep getting a message orphan Response on coordinator. 

Is there some other parameter also that needs to be changed if I want to keep the delay between two packets less than 150 ms? I want to keep that value as low as possible.

Thanks

Yuvraj

  • 0
    Expert 2610 points
    I thought the lower timeout value gives the issue.
    I suggest you to provide delay between two transmission.
    Why do you send the message continuously?



    Regards,
    Keerthi G.
  • 0 in reply to KEERTHI G
    Expert 1045 points
    My application is such that it is required for me to keep the delay as low as possible. Also I wanted to cross the barrier of 150ms to see the behavior. Can we set the value of timeout lower than 150ms and if yes how can we do that ?
  • 0 in reply to yuvraj sahni
    Expert 2610 points
    As I knew, It is not possible to send the data continuously with this low timeout value.
    I would suggest you to provide at least 1sec delay between successive data.

    If you tell me your requirements little more, I will try to give the solution.

    Regards,
    Keerthi G.
  • 0 in reply to KEERTHI G
    Expert 1045 points
    I want to send the analog data after passing through ADC of MSP430F5438A controller. I want to send the data from end device and receive at coordinator with routers in between. The analog data has frequency of 0Hz to 250Hz. I am sending the data received at coordinator to PC using UART. For testing purpose I am sending a sine wave generated from function generator and passing it through analog pin of MSP430F5438A.

    I am not able to send the data correctly i.e. the signal received is not continuous and it has spikes in between. I want the signal received to be very smooth. I am trying to adjust the delay between two packets to see if I can get smooth wave for low delay values.
  • 0 in reply to yuvraj sahni
    Guru 735695 points
    According to the description of your application, I suggest you collect several ADC data to send at a time. Don't send an single ADC EVERY TIME. For example, you can collect 40 ADC reading and send in a message. In this way, you don't have to use TX very fast.
  • 0 in reply to YiKai Chen
    Expert 1045 points
    Yikai Chen,

    I am currently collecting 60 bytes of data and sending them after a delay of 200ms. I have kept the sampling rate of ADC 7075Hz and I have also kept delay of 1ms between two values of ADC in ADC ISR.

    Using above settings I am able to receive the data correctly or almost smoothly for frequencies above 30Hz to 150Hz but for low frequencies the data is not smooth . I want smooth data for 0 Hz to 250Hz
  • 0 in reply to yuvraj sahni
    Expert 1045 points
    Hi,

    Anyone please help me with my query.

    Thanks
  • 0 in reply to yuvraj sahni
    Guru 735695 points
    According to my experience, ZED can't send data that fast. My experience shows the fastest data rate of ZED is about 16K bits per seconds. I don't think you can make ZED send smooth data on 250 Hz.
  • 0 in reply to YiKai Chen
    Expert 1045 points
    Yikai Chen Sir,

    Thanks for the reply.

    As you told that the fastest data rate of ZED is about 16K bits per second and 250Hz means 250 * 8 bits per second so shouldn't 16K bits per second be sufficient for reconstruction of signal?

    If I consider that I cannot send smooth data for 250 Hz then what is the maximum limit?

    Also can you please tell me how to send 16K bits per second, what settings should I use?

    Thanks

    Yuvraj Sahni
  • 0 in reply to yuvraj sahni
    Guru 735695 points
    Sorry, I might misunderstand you. If your 250Hz means 250*8bits per seconds, I think it is no problem to send data smoothly. You can do collect 50 ADC reading and send them in one message. So, ZED only has to send ADC data 5 times per seconds in 200ms interval.