Diff: main.cpp

Revision:

1:1df877428dff

Parent:

0:03ec17aefbcc

Child:

2:4a0b5f2947d1

--- a/main.cpp	Fri Jan 09 11:11:45 2015 +0000
+++ b/main.cpp	Tue Jan 20 08:13:03 2015 +0000
@@ -1,25 +1,12 @@
 #include "mbed.h"
 #include "MMA8451Q.h"
+
 #if   defined (TARGET_KL25Z) || defined (TARGET_KL46Z)
   PinName const SDA = PTE25;
   PinName const SCL = PTE24;
   #else
   #error TARGET NOT DEFINED
 #endif
-/*
-#if   defined (TARGET_KL25Z) || defined (TARGET_KL46Z)
-  PinName const SDA = PTE25;
-  PinName const SCL = PTE24;
-#elif defined (TARGET_KL05Z)
-  PinName const SDA = PTB4;
-  PinName const SCL = PTB3;
-#elif defined (TARGET_K20D50M)
-  PinName const SDA = PTB1;
-  PinName const SCL = PTB0;
-#else
-  #error TARGET NOT DEFINED
-#endif
-*/
 
 #define MMA8451_I2C_ADDRESS (0x1d<<1)
 #define CNTRL_REG_1 0x2A
@@ -29,23 +16,38 @@
 #define Z_acc 0x05
 #define STATUS 0x00
 
-float conversion(char buf);
 PinName const MOSI = PTD2;
 PinName const MISO = PTD3;
 PinName const SCK = PTD1;
 PinName const SS = PTD0;
 
+float conversion(char buf);
+
+//funzione che trasmette ad uno schermo in SPI i valori delle accelerazioni in codice ascii
+void VAL_TO_SPI( char tens, char unit, int pos_unit);
+
+//inizializzazione dell protocollo SPI
+SPI device(MOSI, MISO, SCK); // mosi, miso, clock
+
+float x, y, z;
+
 int main(void)
 {
     
     I2C i2c(SDA,SCL);
-    SPI device(MOSI, MISO, SCK); // mosi, miso, sclk
+    
+    
+    //trasmettiamo 8 bit alla volta
+    //POL = 0, PHA = 1
     device.format(8,1);
+    //frequenza della trasmissione SPI
     device.frequency(500000);
+    
+    
     MMA8451Q acc(SDA, SCL, MMA8451_I2C_ADDRESS);
     
     int address = MMA8451_I2C_ADDRESS;
-    float x, y, z;
+   
     char stato=STATUS;
     char addr_reg2=CNTRL_REG_2;
     char data_stato;
@@ -56,21 +58,24 @@
     char z_buffer;
     char y_buffer;
     char x_buffer;
+    char x_str[8];
+    char y_str[8];
+    char z_str[8];
    
+   //inizializziamo il registro di controllo a 0 per poterlo settare
     char data[2] = {CNTRL_REG_1, 0x00};
     i2c.write(address, data, 2);
     
+    
      i2c.write(address,&addr_reg2,1,true);
        i2c.read(address,&stato_reg2,1,false);
     
     char data_reg2[2] = {CNTRL_REG_2, (stato_reg2 |4)};
     i2c.write(address, data_reg2, 2);
     
+    //settiamo il registro di controllo
     char data_reg1[2]={CNTRL_REG_1, 0xFB};
     i2c.write(address,data_reg1, 2);
-    PwmOut rled(LED1);
-    PwmOut gled(LED2);
-    PwmOut bled(LED3);
 
     while (true) {
        
@@ -84,47 +89,33 @@
         y = 0;
        i2c.write(address,&Z_addr,1,true);
        i2c.read(address,&z_buffer,1,false);
-       printf("z=%d\n\r", z_buffer);
-       
        
        i2c.write(address,&X_addr,1,true);
        i2c.read(address,&x_buffer,1,false);
-       printf("x=%d\n\r", x_buffer);
-       
        
        i2c.write(address,&Y_addr,1,true);
        i2c.read(address,&y_buffer,1,false);
-       printf("y=%d\n\r", y_buffer);
        
-       printf("\n\r");
        x = conversion(x_buffer);
-       printf("X= %f\n\r",x);
+       
        y = conversion(y_buffer);
-       printf("Y= %f\n\r",y);
+       
        z = conversion(z_buffer);
-       printf("Z= %f\n\r",z);
-       printf("\n\r");
-       rled = 1.0f - abs(x);
-       gled = 1.0f - abs(y);
-       bled = 1.0f - abs(z);
 
-    
        }
+       x = x*2.551 + 50;
+       sprintf(x_str,"%f",x);
+       VAL_TO_SPI( x_str[0], x_str[1], 134);
+       printf("ciao");
        
-        char zeta[8];
-       z = -1.62830;
-       sprintf(zeta,"%lf",z);
-       int i;
-       for(i=0; i<8; i++)
-       {
-           DigitalOut  (SS,0);
-            device.write(i);
-            //device.write(85);
-            DigitalOut  (SS,1);
-            DigitalOut  (SS,0);
-            device.write(zeta[i]);
-            DigitalOut  (SS,1);
-        }
+       y = y*2.551 + 50;
+       sprintf(y_str,"%f",y);
+       VAL_TO_SPI( y_str[0], y_str[1], 132);
+       
+       z = z*2.551 + 50;
+       sprintf(z_str,"%f",z);
+       VAL_TO_SPI( z_str[0], z_str[1], 130);
+        
     }
 }
 
@@ -175,3 +166,18 @@
     val = (float) val/64;
     return val;
 }
+
+void VAL_TO_SPI( char tens, char unit, int pos_unit)
+{
+    int pos_tens;
+    pos_tens = pos_unit + 1;
+    DigitalOut  (SS,0);
+    device.write(pos_unit);
+    device.write(unit);
+    DigitalOut  (SS,1);
+    DigitalOut  (SS,0);
+    device.write(pos_tens);
+    device.write(tens);
+    DigitalOut  (SS,1);
+    return;   
+}