Código Acelerómetro para Codewarrior 10.6

Descripción de funciones

Inicialización de periféricos

ICS

void ICS_FEI(void) {

if (NVICSTRM != 0xFF)
ICSTRM = NVICSTRM;
else
ICSTRM = 0xAD;
ICSC1 = ICSC1_FEI;
ICSC2 = ICSC2_FEI;
ICSSC = ICSSC_FEI;
while (ICSC1_CLKS != ICSSC_CLKST) {}
} //end

KBI

void InitKBI(void) {
// Enable KBI1P[3:2] as interrupt
  KBI1PE = KBI_SW;
  KBI1SC = 0b00000110;
/*               ||||
                 |||+---- KBIMOD = KBI detection mode: 0=edge only
                 ||+----- KBIE   = KBI int enable: 1=enabled
                 |+------ KBACK  = KBI int acknowledge: 1=clr IRQF
                 +------- KBF    = KBI flag
*/
}

SCI

void InitSCI(word baud) {

  SCI1BD = baud;  // set baud
}

ICC

void IIC_configuration (void) {
 
  IIC2F = 0x90;         
  IIC2C1  = 0xC0;      
}

Funciones para la transmisión y recepción de datos

Enviar caracteres

char RecChar(void) {
  byte rec_char;

  if (SCI1S1_RDRF)  
  rec_char = SCI1D;  
  SCI1C2_RE = 1;    
  while(!SCI1S1_RDRF){  };
  rec_char = SCI1D; 
  SendChar((char) rec_char);
  return (char) SCI1D;
}

Recibir caracter

void SendChar(char s_char) {

SCI1C2 = 0x08;    // enable Tx
while(!SCI1S1_TDRE){ }
SCI1D = (byte) s_char;   // 2nd half of TDRE clear procedure
} //end SendChar
}

Enviar mensaje

void SendMsg(char msg[]) {
  byte i=0;
  char nxt_char;

  SCI1C2 = 0x08;    // enable Tx
  nxt_char = msg[i++];
  while(nxt_char != 0x00) {
   while(!SCI1S1_TDRE){}
   SCI1D = (byte) nxt_char; // 2nd half of TDRE clear procedure
   nxt_char = msg[i++];
  } //end while((SCI1D
} //end SendMsg

Conversión de datos

word hex2bcd(word hex){
byte dec[4],i;
word bcd;

for (i=0;i<4;i++){
dec[i] = (byte) (hex%10);
hex = (word) (hex/10);
}

if (hex>0){
bcd=0xffff;
}else{
bcd=(word)((word)(dec[3]<<12) + (word)(dec[2]<<8) + (dec[1]<<4) + dec[0]);
}
return bcd;
} //end hex2bcd

byte asc2byte(char n_asc) {
byte n;

n = (byte)(n_asc - 0x30);      //convert from ascii to int
if(n > 0x09)           // if num is $a or larger...
n -= 0x07;           // ...sub $7 to correct
if(n > 0x0f)           // if lower case was used...
n -= 0x20;           // ...sub $20 to correct
if(n > 0x0f)           // if non-numeric character...
n = 0x00;            // ...default to '0'
return n;
} //end asc2num

word asc2word(byte n_asc[2]) {
word n,n2;

// assumes n_asc[0] is MSB, n_asc[1] is LSB
n = (word)(n_asc[0] - 0x30);   //convert from ascii to int
if(n > 0x09)           // if num is $a or larger...
n -= 0x07;           // ...sub $7 to correct
if(n > 0x0f)           // if lower case was used...
n -= 0x20;           // ...sub $20 to correct
if(n > 0x0f)           // if non-numeric character...
n = 0x00;            // ...default to '0'
n = (word)(n<<8);              // shift into high byte
n2 = (word)(n_asc[1] - 0x30);  //convert from ascii to int
if(n2 > 0x09)          // if num is $a or larger...
n2 -= 0x07;          // ...sub $7 to correct
if(n2 > 0x0f)          // if lower case was used...
n2 -= 0x20;          // ...sub $20 to correct
if(n2 > 0x0f)          // if non-numeric character...
n2 = 0x00;           // ...default to '0'
n += n2;               //
return n;
} //end asc2word

char * byte2asc(byte num, byte base) {
byte n;

if (base){
n=(byte)(hex2bcd(num));
}else{
n=num;
} //end if (base)
n_str[0] = (byte)((n>>0x04)+0x30);  // convert MSN to ascii
if(n_str[0]>0x39)           // if MSN is $a or larger...
n_str[0]+=0x07;           // ...add $7 to correct
n_str[1] = (byte)((n&0x0f)+0x30);   // convert LSN to ascii
if(n_str[1]>0x39)           // if LSN is $a or larger...
n_str[1]+=0x07;           // ...add $7 to correct
n_str[2] = 0x00;            // add line feed
return  (char *) n_str;
} //end byte2asc

char * word2asc(word num, byte base) {
word n;

if (base){
n=hex2bcd(num);
}else{
n=num;
} //end if (base)

n_str[0] = (byte)((n>>12)+0x30);    // convert MSN to ascii
if(n_str[0]>0x39)           // if MSN is $a or larger...
n_str[0]+=0x07;           // ...add $7 to correct
n_str[1] = (byte)(((n>>8)&0x0f)+0x30);   // convert 2nd MSN to ascii
if(n_str[1]>0x39)           // if LSN is $a or larger...
n_str[1]+=0x07;           // ...add $7 to correct
n_str[2] = (byte)(((n>>4)&0x0f)+0x30);   // convert 2nd MSN to ascii
if(n_str[2]>0x39)           // if LSN is $a or larger...
n_str[2]+=0x07;           // ...add $7 to correct
n_str[3] = (byte)((n&0x0f)+0x30);   // convert 2nd MSN to ascii
if(n_str[3]>0x39)           // if LSN is $a or larger...
n_str[3]+=0x07;           // ...add $7 to correct
n_str[4] = 0x00;    // add line feed
return  (char *) n_str;

} //end word2asc

Aceleración

void ReadAcceleration(void){
  byte i;
  signed int temp;

  for(i=0;i<3;i++){
    temp = IIC_Rec_Data[i] & 0x3F;  
    if(IIC_Rec_Data[i] & 0x20){
       temp |= 0xFFC0;                                
       temp += 32;
       IIC_Converted_Data[i] = temp;
    }else{   
      IIC_Converted_Data[i] = temp + 32;
    }
  }
}

Contributors

AlexisG, AriannaG, DanielaB, DiegoGue, RicardoP, SimonR, TomNET