need help getting ascii from a char array

[aj9999]

I am trying to get data from a temp sensor using MPLAB and C18, I poll the sensor and feed the values into a char array and then pass that array to another function, then send it to the LCD. I cannot get the LCD to display the number in decimal, presumably i need to change the BCD in the char array to ascii but my attempts were unsuccesful. THe BCD values that i am getting appear correct so what command can i use to convert it? i tried atoi but that didnt work.

#define LED1 PORTBbits.RB1
#define LED2 PORTBbits.RB2
#define button PORTAbits.RA4

unsigned char line1[17] = "!   1st line   !";
unsigned char line2[17] = "                ";

int i,l,h,ans = 0;
unsigned char *bcd_temp;
unsigned char *SPI_get(void);

void main()
{
  TRISA = 0x10;
  TRISB = 0x00;
  TRISD = 0x00;
  TRISE = 0x00;
  PORTB = 0x00;
  PORTD = 0x00;

  LCD_init();

  while(1)
  {
    ans = 0;
    bcd_temp = SPI_get();
    i=0;
    while(i<=16)
    {
      line1[i] = bcd_temp[i] + 0x30;  //converts to display 16bit bcd in ascii
  	  i++;		                          //currently 0000 1011 1001 1111 after +0x30
    }
   for (i=0; i<=8; i++)  // get rid of lower 7 bits making 0 0001 0111 =23 or similar
   {
      line2[i+7] = bcd_temp[i] + 0x30;       //
   }
//   ans = atoi (line2);
//   h = ans/0x0a + 0x30;
//   l = ans%0x0a + 0x30;
//   
//   line1[7] = ' ';
//   line1[8] = h;
//   line1[9] = l;
//   line1[10] = ' ';
   LCD_write_line(1,line1);  //currently 0000 1011 1001 1111, upper 9 bits give 23
   LCD_write_line(2,line2);
  }
}
unsigned char *SPI_get(void)
{
  SPI_SDI_DIR = 1;
  SPI_SCK_DIR = 0;
  SPI_CS_DIR = 0; 
  ADCON1 = 0x0f;
  counter = 0x10;
  SPI_SCK = 0;
  SPI_CS = 0;
  i=0;  
  while(i<=16)
  {
    SPI_SCK = 1;
    temp[i] = SPI_SDI;
    SPI_SCK = 0;
    i++;
  }
  SPI_CS = 1;
  return temp;
}

Thanks

 

[betwixt]

Try this:

get the character from the array into a variable, lets call it BCDChar.

High ascii character is ((BCDChar & 0xf0) >> 4) + 0x30
Low ascii character is (BCDChar & 0x0f) +0x30

If you have a function like 'ctoa()' use that instead of adding 0x30.

Brian.