Texas Instruments MSP430

294
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));