X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=firmware%2Fapps%2Fi2c%2Fi2c.c;h=85677dfbdb29ec4f64cabb450087720c0b79cac1;hb=443bcd972725a80fd8d55014d4f1d84485ec53f0;hp=1f92b9e92b478d7f0b5456e1b8c5647677a3c72c;hpb=aa1ad64b8f1a87590c9a94d32a1561bca33e843c;p=goodfet

diff --git a/firmware/apps/i2c/i2c.c b/firmware/apps/i2c/i2c.c
index 1f92b9e..85677df 100644
--- a/firmware/apps/i2c/i2c.c
+++ b/firmware/apps/i2c/i2c.c
@@ -1,5 +1,8 @@
-//GoodFET I2C Master Application
-//Handles basic I/O
+/*! \file i2c.c
+  \author Travis Goodspeed
+  \brief I2C Master  
+*/
+
 
 //Higher level left to client application.
 
@@ -8,6 +11,7 @@
 
 #include "platform.h"
 #include "command.h"
+#include "i2c.h"
 
 #include <signal.h>
 #include <io.h>
@@ -15,21 +19,44 @@
 
 
 //Pins and I/O
-#define SS   BIT3
-#define SDA  BIT2
-#define SCL  BIT3
+#include <jtag.h>
+
+//! Handles an i2c command.
+void i2c_handle_fn( uint8_t const app,
+					uint8_t const verb,
+					uint32_t const len);
+
+// define the i2c app's app_t
+app_t const i2c_app = {
+
+	/* app number */
+	I2C,
+
+	/* handle fn */
+	i2c_handle_fn,
+
+	/* name */
+	"I2C",
 
-#define I2CDELAY(x) delay(x)
+	/* desc */
+	"\tThe I2C app implements the i2c bus protocol thus\n"
+	"\tturning your GoodFET into a USB-to-i2c adapter.\n"
+};
 
-//Bits are cleared by output of low.
-//Bits are set but input and pull-up resistor.
-#define SETSDA P5DIR&=~SDA
-#define CLRSDA P5DIR|=SDA
-#define SETSCL P5DIR&=~SCL
-#define CLRSCL P5DIR|=SCL
+#define SDA TDI
+#define SCL TDO
+
+#define I2CDELAY(x) delay(x<<4)
+
+
+//2xx only, need 1xx compat code
+#define CLRSDA P5OUT&=~SDA
+#define SETSDA P5OUT|=SDA
+#define CLRSCL P5OUT&=~SCL
+#define SETSCL P5OUT|=SCL
 
 #define READSDA (P5IN&SDA?1:0)
-#define SETBOTH P5DIR&=~(SDA|SCL)
+#define SETBOTH P5OUT|=(SDA|SCL)
 
 #define I2C_DATA_HI() SETSDA
 #define I2C_DATA_LO() CLRSDA
@@ -37,6 +64,26 @@
 #define I2C_CLOCK_HI() SETSCL
 #define I2C_CLOCK_LO() CLRSCL
 
+//#warning "Using internal resistors.  Won't work on 161x devices."
+
+//! Inits bitbanging port, must be called before using the functions below
+void I2C_Init()
+{
+  
+  //Clear SDA and SCL.
+  //Direction, not value, is used to set the value.
+  //(Pull-up or 0.)
+  
+  P5DIR|=(SDA|SCL);
+  //P5REN|=SDA|SCL;
+  
+  
+  I2C_CLOCK_HI();
+  I2C_DATA_HI();
+
+  I2CDELAY(1);
+}
+
 //! Write an I2C bit.
 void I2C_WriteBit( unsigned char c )
 {
@@ -64,7 +111,7 @@ unsigned char I2C_ReadBit()
 
   I2C_CLOCK_HI();
   I2CDELAY(1);
-
+  
   unsigned char c = READSDA;
 
   I2C_CLOCK_LO();
@@ -73,19 +120,6 @@ unsigned char I2C_ReadBit()
   return c;
 }
 
-//! Inits bitbanging port, must be called before using the functions below
-void I2C_Init()
-{
-  //Clear SDA and SCL.
-  //Direction, not value, is used to set the value.
-  //(Pull-up or 0.)
-  P5OUT&=~(SDA|SCL);
-  
-  I2C_CLOCK_HI();
-  I2C_DATA_HI();
-
-  I2CDELAY(1);
-}
 
 //! Send a START Condition
 void I2C_Start()
@@ -116,7 +150,7 @@ unsigned char I2C_Write( unsigned char c )
 {
   char i;
   for (i=0;i<8;i++){
-    I2C_WriteBit( c & 128 );
+    I2C_WriteBit( c & 0x80 );
     c<<=1;
   }
   
@@ -146,41 +180,48 @@ unsigned char I2C_Read( unsigned char ack )
 }
 
 
-//! Handles a monitor command.
-void i2chandle(unsigned char app,
-	       unsigned char verb,
-	       unsigned char len){
-  unsigned char i;
-  switch(verb){
-    
-  case PEEK:
-    break;
-  case POKE:
-    break;
-    
-  case READ:
-    if(len>0)          //optional parameter of length
-      len=cmddata[0];
-    if(len==0)         //default value of 1
-      len=1;
-    for(i=0;i<len;i++)
-      cmddata[i]=I2C_Read(1);  //Always acknowledge
-    txdata(app,verb,len);
-    break;
-  case WRITE:
-    for(i=0;i<len;i++)
-      I2C_Write(cmddata[i]);
-    txdata(app,verb,0);
-    break;
-  case START:
-    I2C_Start();
-    break;
-  case STOP:
-    I2C_Stop();
-    break;
-  case SETUP:
-    I2C_Init();
-    txdata(app,verb,0);
-    break;
-  }
+//! Handles an i2c command.
+void i2c_handle_fn( uint8_t const app,
+					uint8_t const verb,
+					uint32_t const len)
+{
+	unsigned char i;
+	unsigned long l;
+	switch(verb)
+	{
+
+	case PEEK:
+		break;
+	case POKE:
+		break;
+
+	case READ:
+		l = len;
+		if(l > 0)					//optional parameter of length
+			l=cmddata[0];
+		if(!l)						//default value of 1
+			l=1;
+		for(i = 0; i < l; i++)
+			cmddata[i]=I2C_Read(1);	//Always acknowledge
+		txdata(app,verb,l);
+		break;
+	case WRITE:
+		cmddata[0]=0;
+		for(i=0;i<len;i++)
+			cmddata[0]+=I2C_Write(cmddata[i]);
+		txdata(app,verb,1);
+		break;
+	case START:
+		I2C_Start();
+		txdata(app,verb,0);
+		break;
+	case STOP:
+		I2C_Stop();
+		txdata(app,verb,0);
+		break;
+	case SETUP:
+		I2C_Init();
+		txdata(app,verb,0);
+		break;
+	}
 }