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POHow do I continuously send and receive with wireless serial-port in 8051?
 

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  1. POHow do I continuously send and receive with wireless serial-port in 8051?
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    <p>I'm trying to make a microcontroller communicate with a program on my desktop. I'm using serial port connections with Xbee radios on both ends. </p> <p>The communication works fine when I send something from the microcontroller to the desktop and the program on the desktop then sends something back to the microcontroller. </p> <p>However, when I require the information to be sent from the controller to the desktop program continuously until the desktop program sends a particular answer it doesn't work. </p> <p>Here's the code for what I'm talking about:</p> <pre><code> unsigned char ans = 'N'; unsigned int count = 0; void main(void) { while(1) { if(count == 0) { Configure(); count = 1; } //there is some more code here but is irrelevant to the serial communication } } void Configure() { //Repeat this until the user accepts the sent string as correct while(ans == 'N') { BuildString(); Send(); Receive(); } } void Send() { unsigned int i; TMOD = 0x20; TH1 = 0xFD; SCON = 0x50; TR1 = 1; for(i=0; i&lt;4; i++) { SBUF = toSend[i]; while(TI == 0); TI = 0; } } void Receive() { unsigned int j; TMOD = 0x20; TH1 = 0xFD; SCON = 0x50; TR1 = 1; for(j=0; j&lt;2; j++) { while(RI == 0); Received[j] = SBUF; RI = 0; } if(count == 0) ans = Received[1]; else { RunType = Received[0]; Move = Received[1]; } } </code></pre> <p>The BuildString() function simply constructs a string on the basis of some sensor inputs. The send and receive functions work fine usually but when I need them to send and receive continuously, like in the Configure() function above, it doesn't work. </p> <p>Any suggestions? I'd really appreciate them.</p>
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      1. POHow do I continuously send and receive with wireless serial-port in 8051?
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    1. COA quick and dirty hack that will make your code more reliable is to limit the amount of time you will wait for RI to be set to true. Set a variable to 65535 and decrement. If it reaches 0 before you get a byte, give up and try sending again. If you really need an interrupt based version of your code, I can knock on up for you - in general these are far more reliable.
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      1. USTom Leys
 

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