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problem with some signal conversion.

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Ahmmed Razu

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Recently i have done an experiment on uc.In this time i faced problem with some signals(square wave).I sent the one signal(first picture) and received the another one (second picture and full shape is shown in picture3).the problem is related to uc UART.Now the problem is how can i convert the second signal to first signal for a fixed bit per second(as the problem related to uc UART). DS0001 (2).jpgDS0038 (2).jpgDS0042 (2).jpg
 

skogsjanne

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I think you have to provide some more information
 

Ahmmed Razu

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I think the information needed to solve the matter given below:
The problem is related to atmega8 USART.I am transmitting data(as in first picture) via RF transmitter module(KST TX01) at 960 baud rate and receiving data by RF receiver module(KST RX806) at the same baud.the problem is that my receiver stays low when no signal is transmitted and when i transmit any signal(picture1), in the receiving end i obtain some signal (picture2 & 3) which is symmetrical to the transmitted signal but not same i.e. unequal time distribution of the bits of received signal as shown in picture 2 & 3(simply the time duration of each bit is not same).So my receiving uc(atmega8) shows garbage value because the received signal is not same or perfect like transmitted signal i.e. corrupted.So for this reason i have to modify or convert the received signal to make it similar to the transmitted signal at a given baud.Suggestion needed.
 
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skogsjanne

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I don't think the problem is with the UART. I think you have to send a few bytes of 0x55 or something similar at the beginning to get the link up and running OK.
 

Ahmmed Razu

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I don't think the problem is with the UART. I think you have to send a few bytes of 0x55 or something similar at the beginning to get the link up and running OK
It's working.very helpful suggestion.just continue.
 

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