Código Acelerómetro para Codewarrior 10.6

Descripción de funciones

Inicialización de periféricos

ICS

El módulo ICS (Internal Clock Source) maneja las diferentes opciones para la fuente de reloj. Tiene siete modos de operación: FEI, FEE, FBI, FBILP, FBE, FBELP, y stop. En este caso se trabajará con el modo por defecto FEI.

Para inicilizar el ICS deben modificarse tres de sus registros:

ICSC1: ICS Control Register 1 Archivo:ICSC1.jpg

ICSC2: ICS Control Register 2

ICSSC: ICS Status and Control

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