PIC16F877A+UART for Display of Measurements LABVIEW

Question

I need to send four measurement parameters to the PC for display and storage purposes. The software for this aim is LABVIEW. I am new to PIC and Interfacing, but by putting so much effort and asking questions from experts, i could have accomplished the acquisition of all the data till today.
I could also transmit a character "HELLO" through RS232 with my UART to USB converter and the result in hyperterminal was observed as well.
I am quite happy that i could have reached up to this stage. but on the other hand, unfortunately my knowledge is absolutely poor about LABVIEW.
I have heard that if i have control over the format of the data from PIC to LABVIEW, it is not that difficult.
Please find the attached pictures of the design for better understanding.
Questions:
1- can you please explain what is exactly meant by format of data?(I also don't know the format of data i sent through USB)
2- After specifiying the format, what would be the next stage?
3- If it is possible, please provide me with some sample codes for Hi-tech C, and LABVIEW as well.
Solved!
Go to Solution.
Attachments:
PIC16F877A+UART for LABVIEW_page1_image1.png ‏587 KB
PIC16F877A+UART for LABVIEW_page2_image1.jpg ‏72 KB
PIC16F877A+UART for LABVIEW_page3_image1.jpg ‏71 KB

Answer 1

void read_adc(void)                                                                 ////This function generates the average reading value of ADC
    unsigned short i;
    unsigned long result_temp=0;
    for(i=2000;i>0;i-=1)                                                            //looping 2000 times for getting average value
        ADGO = 1;                          //ADGO is the bit 2 of the ADCON0 register
        while(ADGO==1);                    //ADC start, ADGO=0 after finish ADC progress
        result=ADRESH;
        result=result<<8;                       //shift to left for 8 bit
        result=256*result|ADRESL;            //10 bit result from ADC
        result_temp+=result;
    result = result_temp/2000;            //getting average value
unsigned short read_temp(void)                                                        ////This function stores the generated value by ADC into the variable "temp"
    unsigned short temp;
    temp=result;
    return temp;
==========================================================================================================
//Since only 8 bits at a time can be sent with USART and the ADC value is 10 bits.
//How to recombine the Lo and Hi 8-bit values to get 10-bit value?
do {
for (i=0; i <=7; i++) {
myarray[i]=read_temp();
for (i=0; i <=7; i++)  {
putch (Lo(myarray[i]));               //send the lower 8 bits of ADC reading
putch(Hi(myarray[i]));                 // Send upper 8 bits of ADC reading
===========================================================================
Please let me know your feedback about this code?Is it sufficient for sending analog measurement values?
do {
    USART_Write(255);
    an0 = ADC_Read(0) >> 2; 
    an0 = (an0 - 1);                                     / 1 is taken away from the value of ADC read, because if Voltage In is 5 volts ADC value
    USART_Write(an0);                                 / will be 255 and labview will mistake the data as the start byte. Data can read from 0 - 254.   
    an1 = (an1 - 1);
    an1 = ADC_Read(1) >> 2; 
    USART_Write(an1);       
    an2 = ADC_Read(2) >> 2; 
    an2 = (an2 - 1);
    USART_Write(an2);       
    an3 = ADC_Read(3) >> 2;
    an3 = (an3 - 1);
    USART_Write(an3);       
    an4 = ADC_Read(4) >> 2; 
    an4 = (an4 - 1);
    USART_Write(an4);        
How about this?