io.h is deprecated, so now msp430.h is included instead.

[goodfet] / firmware / apps / i2c / i2c.c

diff --git a/firmware/apps/i2c/i2c.c b/firmware/apps/i2c/i2c.c
index 1f92b9e..e58b266 100644 (file)
--- 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.
 
@@ -8,28 +11,73 @@
 
 #include "platform.h"
 #include "command.h"
+#include "i2c.h"
 
 #include <signal.h>
-#include <io.h>
+#include <msp430.h>
 #include <iomacros.h>
 
 
 //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_APP,
+
+       /* handle fn */
+       i2c_handle_fn,
+
+       /* name */
+       "I2C",
+
+       /* desc */
+       "\tThe I2C app implements the i2c bus protocol thus\n"
+       "\tturning your GoodFET into a USB-to-i2c adapter.\n"
+};
+
+#define I2CDELAY(x) delay(x<<4)
+
+
+//2xx only, need 1xx compat code
+#if (board == tilaunchpad)
+// P3.1 SDA
+// P3.3 SCL
+#define SDA (1<<1)
+#define SCL (1<<3)
+
+#define CLRSDA P3OUT&=~SDA
+#define SETSDA P3OUT|=SDA
+#define CLRSCL P3OUT&=~SCL
+#define SETSCL P3OUT|=SCL
+
+#define READSDA (P3IN&SDA?1:0)
+#define SDAINPUT P3DIR&=~SDA
+#define SDAOUTPUT P3DIR|=SDA
+#define SCLINPUT P3DIR&=~SCL
+#define SCLOUTPUT P3DIR|=SCL
+#define SETBOTH P3OUT|=(SDA|SCL)
+
+#else
 
-#define I2CDELAY(x) delay(x)
+#define SDA TDI
+#define SCL TDO
 
-//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 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)
+#endif
 
 #define I2C_DATA_HI() SETSDA
 #define I2C_DATA_LO() CLRSDA
@@ -37,6 +85,39 @@
 #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.)
+  
+#if (platform == tilaunchpad)
+  SDAOUTPUT;
+  SCLOUTPUT;
+#else
+  P5DIR|=(SDA|SCL);
+#endif
+  //P5REN|=SDA|SCL;
+  
+  
+  I2C_CLOCK_HI();
+  I2C_DATA_HI();
+
+  I2CDELAY(1);
+}
+
+#if (platform == tilaunchpad)
+void I2C_Exit()
+{
+  SDAINPUT;
+  SCLINPUT;
+}
+#endif
+
 //! Write an I2C bit.
 void I2C_WriteBit( unsigned char c )
 {
@@ -63,29 +144,18 @@ unsigned char I2C_ReadBit()
   I2C_DATA_HI();
 
   I2C_CLOCK_HI();
+  SDAINPUT;
   I2CDELAY(1);
-
+  
   unsigned char c = READSDA;
 
   I2C_CLOCK_LO();
   I2CDELAY(1);
+  SDAOUTPUT;
 
   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 +186,7 @@ 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 +216,48 @@ 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;
+       }
 }