void initI2CModule(void)
{
unsigned int flags = EUSCI_B_I2C_TRANSMIT_INTERRUPT0 |
EUSCI_B_I2C_RECEIVE_INTERRUPT0 |
EUSCI_B_I2C_TRANSMIT_INTERRUPT1 |
EUSCI_B_I2C_RECEIVE_INTERRUPT1 |
EUSCI_B_I2C_STOP_INTERRUPT |
EUSCI_B_I2C_NAK_INTERRUPT;
#if 0
/* Select Port B1 for I2C - Set Pin 4, 5 to input Primary Module Function,
* (UCB1SIMO/UCB1SDA, UCB1SOMI/UCB1SCL).
*/
GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P6,
GPIO_PIN4 + GPIO_PIN5, GPIO_PRIMARY_MODULE_FUNCTION);
/* eUSCI I2C Slave Configuration */
I2C_initSlave(EUSCI_B1_BASE, SLAVE_ADDRESS, EUSCI_B_I2C_OWN_ADDRESS_OFFSET0,
EUSCI_B_I2C_OWN_ADDRESS_ENABLE);
I2C_initSlave(EUSCI_B1_BASE, 0xC, EUSCI_B_I2C_OWN_ADDRESS_OFFSET1,
EUSCI_B_I2C_OWN_ADDRESS_ENABLE);
I2C_setMode(EUSCI_B1_BASE, EUSCI_B_I2C_RECEIVE_MODE);
/* Enable the module and enable interrupts */
I2C_enableModule(EUSCI_B1_BASE);
MAP_I2C_clearInterruptFlag(EUSCI_B1_BASE, EUSCI_B_I2C_RECEIVE_INTERRUPT0);
MAP_I2C_enableInterrupt(EUSCI_B1_BASE, EUSCI_B_I2C_RECEIVE_INTERRUPT0);
MAP_Interrupt_enableInterrupt(INT_EUSCIB1);
#else
/* eUSCI I2C Slave Configuration */
I2C_initSlave(EUSCI_B0_BASE, SLAVE_ADDRESS, EUSCI_B_I2C_OWN_ADDRESS_OFFSET0,
EUSCI_B_I2C_OWN_ADDRESS_ENABLE);
#if 1
I2C_initSlave(EUSCI_B0_BASE, 0xC, EUSCI_B_I2C_OWN_ADDRESS_OFFSET1,
EUSCI_B_I2C_OWN_ADDRESS_ENABLE);
#endif
/* Select Port B2 for I2C - Set Pin 6, 7 to input Primary Module Function
*/
MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,
GPIO_PIN6 | GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION);
/* Define the SMbus alert pin */
MAP_GPIO_setOutputHighOnPin(GPIO_PORT_P5, GPIO_PIN0);
MAP_GPIO_setAsOutputPin(GPIO_PORT_P5, GPIO_PIN0);
I2C_setMode(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_MODE);
/* Enable the module and enable interrupts */
I2C_enableModule(EUSCI_B0_BASE);
MAP_I2C_clearInterruptFlag(EUSCI_B0_BASE, flags);
MAP_Interrupt_setPriority(INT_EUSCIB0, configMAX_SYSCALL_INTERRUPT_PRIORITY);
MAP_I2C_enableInterrupt(EUSCI_B0_BASE, flags);
MAP_Interrupt_enableInterrupt(INT_EUSCIB0);
#endif
}
void main (void)
{
//Stop WDT
WDT_hold(__MSP430_BASEADDRESS_WDT_A__);
//Assign I2C pins to USCI_B0
GPIO_setAsPeripheralModuleFunctionInputPin(__MSP430_BASEADDRESS_PORT3_R__,
GPIO_PORT_P3,
GPIO_PIN1 + GPIO_PIN2
);
//Initialize Master
I2C_masterInit(__MSP430_BASEADDRESS_USCI_B0__,
I2C_CLOCKSOURCE_SMCLK,
UCS_getSMCLK(__MSP430_BASEADDRESS_UCS__),
I2C_SET_DATA_RATE_400KBPS
);
//Specify slave address
I2C_setSlaveAddress(__MSP430_BASEADDRESS_USCI_B0__,
SLAVE_ADDRESS
);
//Set Master in receive mode
I2C_setMode(__MSP430_BASEADDRESS_USCI_B0__,
I2C_RECEIVE_MODE
);
//Enable I2C Module to start operations
I2C_enable(__MSP430_BASEADDRESS_USCI_B0__);
//Enable master Receive interrupt
I2C_enableInterrupt(__MSP430_BASEADDRESS_USCI_B0__,
I2C_RECEIVE_INTERRUPT
);
while (1)
{
//Initiate command to receive a single character from Slave
I2C_masterSingleReceiveStart(__MSP430_BASEADDRESS_USCI_B0__);
//Enter low power mode 0 with interrupts enabled.
//Wait until character is received.
__bis_SR_register(LPM0_bits + GIE);
__no_operation();
}
}
