msp430-programlama-notlari-uygulamalar-bilgiler - 320Volt

#pragma vector = USI_VECTOR
__interrupt void USI_TXRX (void)
{
if (USICTL1 & USISTTIFG)
{
P1OUT |= 0x01;
I2C_State = 2;
}
switch(I2C_State)
{
case 0: // Idle, should not get here
break;
case 2: // RX Address
USICNT = (USICNT & 0xE0) + 0x08;
USICTL1 &= ~USISTTIFG;
I2C_State = 4;
break;
case 4: // Process Address and send (N)Ack
if (USISRL & 0x01)
SLV_Addr++;
USICTL0 |= USIOE;
if (USISRL == SLV_Addr)
{
USISRL = 0x00;
P1OUT &= ~0x01;
I2C_State = 8;
}
else
{
USISRL = 0xFF;
P1OUT |= 0x01;
I2C_State = 6;
}
USICNT |= 0x01;
break;
case 6: // Prep for Start condition
USICTL0 &= ~USIOE;
SLV_Addr = 0x90;
I2C_State = 0;
break;
case 8: // Receive data byte
USICTL0 &= ~USIOE;
USICNT |= 0x08;
I2C_State = 10;
break;
MSP430 Programlama Sayfa 83