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HW_I2C.c

#include "HW_I2C.h"

void I2C_USCI_init(unsigned char address)

{

P1DIR &= ~(BIT6 + BIT7);

P1OUT |= (BIT6 + BIT7);

P1SEL2 |= (BIT6 | BIT7);

P1SEL |= (BIT6 | BIT7);

UCB0CTL1 |= UCSWRST;

UCB0CTL0 = (UCMST | UCMODE_3 | UCSYNC);

UCB0CTL1 = (UCSSEL_2 | UCSWRST);

UCB0BR0 = 20;

UCB0I2CSA = address;

UCB0CTL1 &= ~UCSWRST;

}

void I2C_USCI_set_address(unsigned char address)

{

UCB0CTL1 |= UCSWRST;

UCB0I2CSA = address;

UCB0CTL1 &= ~UCSWRST;

}

unsigned char I2C_USCI_read_byte(unsigned char address)

{

while(UCB0CTL1 & UCTXSTP);

UCB0CTL1 |= (UCTR | UCTXSTT);

while(!(IFG2 & UCB0TXIFG));

UCB0TXBUF = address;

while(!(IFG2 & UCB0TXIFG));

UCB0CTL1 &= ~UCTR;

UCB0CTL1 |= UCTXSTT;

IFG2 &= ~UCB0TXIFG;

while(UCB0CTL1 & UCTXSTT);

UCB0CTL1 |= UCTXSTP;

return UCB0RXBUF;

}

unsigned char I2C_USCI_read_word(unsigned char address,unsigned char *value,

unsigned char length)

{

unsigned char i = 0;

while (UCB0CTL1 & UCTXSTP);

UCB0CTL1 |= (UCTR | UCTXSTT);

while (!(IFG2 & UCB0TXIFG));

Brand	Texas Instruments
Model	MSP430
Category	Microcontrollers
Language	English

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