/*! \file i2c.c
\author Travis Goodspeed
-
- GoodFET I2C Master Application
- Handles basic I/O
-
+ \brief I2C Master
*/
#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
#include <jtag.h>
-#define SDA TDI
-#define SCL TDO
+
+//! 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 SDA TDI
+#define SCL TDO
+
#define CLRSDA P5OUT&=~SDA
#define SETSDA P5OUT|=SDA
#define CLRSCL P5OUT&=~SCL
#define READSDA (P5IN&SDA?1:0)
#define SETBOTH P5OUT|=(SDA|SCL)
+#endif
#define I2C_DATA_HI() SETSDA
#define I2C_DATA_LO() CLRSDA
//Direction, not value, is used to set the value.
//(Pull-up or 0.)
+#if (platform == tilaunchpad)
+ SDAOUTPUT;
+ SCLOUTPUT;
+#else
P5DIR|=(SDA|SCL);
- P5REN|=SDA|SCL;
+#endif
+ //P5REN|=SDA|SCL;
I2C_CLOCK_HI();
I2CDELAY(1);
}
+#if (platform == tilaunchpad)
+void I2C_Exit()
+{
+ SDAINPUT;
+ SCLINPUT;
+}
+#endif
+
//! Write an I2C bit.
void I2C_WriteBit( unsigned char c )
{
I2C_DATA_HI();
I2C_CLOCK_HI();
+ SDAINPUT;
I2CDELAY(1);
unsigned char c = READSDA;
I2C_CLOCK_LO();
I2CDELAY(1);
+ SDAOUTPUT;
return c;
}
}
-//! 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) //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:
- 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;
- }
+//! 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;
+ }
}