Diferencia entre revisiones de «Código Acelerómetro para Codewarrior 10.6»

Revisión del 18:06 22 jun 2016

Contenido

1 Descripción general
2 Descripción de funciones

Descripción general

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

ICSC2: ICS Control Register 2

ICSSC: ICS Status and Control

Rutina de inicialización

#define ICSC1_FEI 0x04
#define ICSC2_FEI 0x06
#define ICSSC_FEI 0x80


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) {}
}

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

Recibir caracteres

char RecChar(void) {
  byte rec_char;

  if (SCI1S1_RDRF)  

<font color="#3f7f5f">/ Si el buffer de transmisión esta lleno</font>

  rec_char = SCI1D;  <font color="#3f7f5f">/ Limpio el buffer</font>
  SCI1C2_RE = 1;    <font color="#3f7f5f">/Habilito la transmisión</font>
  while(!SCI1S1_RDRF){  };<font color="#3f7f5f">/ Espero hasta que el buffer no esté vacío</font>
  rec_char = SCI1D; <font color="#3f7f5f">/ Obtengo el caracter enviado</font>
  SendChar((char) rec_char); <font color="#3f7f5f">/ Reenvío el caracter</font>
  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;
    }
  }
}

void ShowAcceleration (void)
{
  word SampleCNT;
  byte j,k;   
  
  ReadAcceleration();           
  ADCSC1 = 0x01;                 
  x.reading[samp]  = (dword)( IIC_Converted_Data[0] <<8);
  ADCSC1 = 0x08;                 
  y.reading[samp]  = (dword)( IIC_Converted_Data[1] <<8);
  ADCSC1 = 0x09;                 
  z.reading[samp]  = (dword)( IIC_Converted_Data[2] <<8);
  
  StartTPM(0);   //0 = TPM prescaler = /2

  if(samp>0){
    switch (mode){
      case filter: filter_data();   break;
      case avg   : avg_data();      break;
      default    : copy_data();
    }
  } else {
    copy_data();
  }
  
  SampleCNT = StopTPM();
  if (SampleCNT<0x0100) {
    for(j=0xff;j>0;j--){
      for(k=0x10;k>0;k--){}
    }
  }

  // Display Acceleration
  SendMsg("\r\n");
  SendMsg(word2asc((word)x.result[samp],dis_base));
  SendMsg(",");
  SendMsg(word2asc((word)y.result[samp],dis_base));
  SendMsg(",");
  SendMsg(word2asc((word)z.result[samp],dis_base));
  SendMsg(",");
  SendMsg(word2asc(SampleCNT,dis_base));
  
  // Shift array of results if we hit max
  if (samp >= max-1) {
    for (j=0;j<max-1;j++){
      x.result[j]  = x.result[j+1];
      x.reading[j] = x.reading[j+1];
      y.result[j]  = y.result[j+1];
      y.reading[j] = y.reading[j+1];
      z.result[j]  = z.result[j+1];
      z.reading[j] = z.reading[j+1];
    }
    samp = max-1;
  } else {
    samp++;
  } //end if (i => max) 
  
}

Funciones del Maestro

void Master_Read_and_Store(void) {
  IIC_Rec_Data[rec_count++] = IIC2D; 
}

void Master_Write_MMA7660_register(byte transbytes) {
  last_byte = 0;                    // Initialize variables to 0
	count = 0;
  bytes_to_trans = transbytes;       
  
  if (transbytes == 0) return; 
  
  IIC2C1_TX = 1;                    // Set TX bit for Address cycle
  IIC2C1_MST = 1;                   // Set Master Bit to generate a Start
  
  IIC2D = mma7660[count++];         // Send first byte (should be 7-bit address + R/W bit)    
}

void Master_Read_MMA7660_register(byte transbytes, byte recbytes) {

  rec_count = 0;                    // Initialize variables to 0
  last_byte = 0;                    
	count = 0;
	repeat_start_sent = 0;
	
  bytes_to_trans = transbytes;      
  num_to_rec = recbytes;
  
  
  if (transbytes == 0) return;  
    
  IIC2C1_TXAK = 0;
  IIC2C1_TX = 1;                    // Set TX bit for Address cycle
  IIC2C1_MST = 1;                   // Set Master Bit to generate a Start
  
  reading_mma7660_reg = 1;
  IIC2D = mma7660[count++];         // Send first byte (should be 7-bit address + R/W bit)    
}

Contributors

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

Diferencia entre revisiones de «Código Acelerómetro para Codewarrior 10.6»

Revisión del 18:06 22 jun 2016

Contenido

Descripción general

Descripción de funciones

Inicialización de periféricos

ICS

KBI

SCI

ICC

Funciones para la transmisión y recepción de datos

Recibir caracteres

Recibir caracter

Enviar mensaje

Conversión de datos

Aceleración

Funciones del Maestro

Contributors

Menú de navegación

Herramientas personales

Espacios de nombres

Variantes

Vistas

Más

Buscar

Navegación

Herramientas