sk40c to Uc00A

[hafdzansauli]

hi i'm beginner in pic program using C language, i got a problem with my project that i work for. my sk40c receive input from port AN0 and data from that i want transmit using RF module wireless through UART (TX port), at receiver i use UC00A (usb to UART converter), supposedly when i connect that UC00A to computer i can receive the value of input at AN0. help me on program pls

CODE: SELECT_ALL_CODE

#include<pic.h>

__CONFIG (0x3F32);

#define      CHANNEL0   0b10000001

void read_adc(void);
void delay(unsigned short i);
void uart_transmit(result);

unsigned short read_temp(void);
unsigned short result;
unsigned short temp;

void main(void)
{
   ADRESH=0;
   ADRESL=0;

   ADCON1=0b11000000;

   TRISA=0b11111111;
   TRISB=0b00000000;
   TRISD=0b00000000;

   PORTB=0;
   PORTD=0;

   unsigned char dummy = 0;
   BRG16 = 0;
   SYNC = 0;
   TX9 = 0;
   RX9 = 0;
   BRGH = 1;                           // Select high speed baud rate.
   SPBRG = 129;                        // Configure the baud rate.
   SPEN = 1;                           // Enable serial port.
   CREN = 1;                           // Enable reception.
   TXEN = 1;                           // Enable transmission.
   dummy = RCREG;                        // dummy read, to clear the receive buffer
   dummy = RCREG;

   while(1)
   {
   ADCON0=CHANNEL0;
            
   read_adc();

   temp=read_temp();

   delay(20000);
   
   uart_send(result);
   }
      
}

void read_adc(void)
{
   unsigned short i;
   unsigned long result_temp=0;
   for(i=20000;i>0;i-=1)         
   {
      ADGO = 1;               
      while(ADGO==1);            
      result=ADRESH;
      result=result<<8;         
      result=result|ADRESL;      
      result_temp+=result;      
   }
   result = result_temp/20000;   
}

unsigned short read_temp(void)
{
   unsigned short temp;
   temp=result;
   return temp;

}

void uart_transmit(result)
{
   while (TXIF == 0);

   TXREG = result;
}

void uart_send(result)
{
   while (result != '\0')
   {
      uart_transmit(result);
      result++;
   }
}

void delay(unsigned short i)
{   
   for(;i>0;i--);
}



[robosang]

Try with actual wired connection first, look at the result and makesure the communication between your microcontroller to computer is correct, then only replace the wire with wireless.

[hafdzansauli]

ty robosang reply my problem...
I just try hardwire between pc n my mcu but it give unwanted symbol...
where is my problem in my program
hope anyone can help...

[robosang]

Most likely is your baudrate

[hafdzansauli]

ty roboson, my coding actually clash in ascII conversion when i differentiate ascII conversion between lcd and uart it fine now.
but in addition when i replace hardwire connected between UC00A and uart with RF recever and transmitter module its not continuous receiving data....

[yonghui]

what is the RF module u r using?

if the low cost wireless please try to use low baudrate mayb 1200bps.
send 10 bytes of 0x00 1st before sending the actual data.


regards,
yh