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Code Example

I2C.h

#include <msp430.h>

#define FALSE 0

#define TRUE 1

#define wr FALSE

#define rd TRUE

#define SET_SDA_AS_OUTPUT() (USICTL0 |= USIOE)

#define SET_SDA_AS_INPUT() (USICTL0 &= ~USIOE)

#define FORCING_SDA_HIGH() \

{ \

USISRL = 0xFF; \

USICTL0 |= USIGE; \

USICTL0 &= ~(USIGE + USIOE); \

}

#define FORCING_SDA_LOW() \

{ \

USISRL = 0x00; \

USICTL0 |= (USIGE + USIOE); \

USICTL0 &= ~USIGE; \

}

void i2c_usi_mst_gen_start(void);

void i2c_usi_mst_gen_repeated_start(void);

void i2c_usi_mst_gen_stop(void);

void i2c_usi_mst_wait_usi_cnt_flag(void);

unsigned char i2c_usi_mst_send_byte(unsigned char value);

unsigned char i2c_usi_mst_read_byte(void);

void i2c_usi_mst_send_n_ack(unsigned char ack);

unsigned char i2c_usi_mst_send_address(unsigned char addr, unsigned char r_w);

I2C.c

#include "I2C.h"

static unsigned char usi_cnt_flag = FALSE;

// function to generate I2C START condition

void i2c_usi_mst_gen_start(void)

{

// make sure SDA line is in HIGH level

FORCING_SDA_HIGH();

// small delay

_delay_cycles(100);

Texas Instruments MSP430 User Manual

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