/** * Called to set the eUSCI module in 'master' mode */ void DWire::_initMaster(const eUSCI_I2C_MasterConfig * i2cConfig) { // Initialise the pins MAP_GPIO_setAsPeripheralModuleFunctionInputPin(modulePort, modulePins, GPIO_PRIMARY_MODULE_FUNCTION); // Initializing I2C Master to SMCLK at 400kbs with no autostop MAP_I2C_initMaster(module, i2cConfig); // Specify slave address MAP_I2C_setSlaveAddress(module, slaveAddress); // Set Master in transmit mode MAP_I2C_setMode(module, EUSCI_B_I2C_TRANSMIT_MODE); // Enable I2C Module to start operations MAP_I2C_enableModule(module); // Enable and clear the interrupt flag MAP_I2C_clearInterruptFlag(module, EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_NAK_INTERRUPT + EUSCI_B_I2C_RECEIVE_INTERRUPT0); // Enable master interrupts MAP_I2C_enableInterrupt(module, EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_NAK_INTERRUPT + EUSCI_B_I2C_RECEIVE_INTERRUPT0); // Register the interrupts on the correct module MAP_Interrupt_enableInterrupt(intModule); MAP_Interrupt_enableMaster(); }
int main(void) { volatile uint32_t ii; /* Disabling the Watchdog */ MAP_WDT_A_holdTimer(); /* Select Port 1 for I2C - Set Pin 6, 7 to input Primary Module Function, * (UCB0SIMO/UCB0SDA, UCB0SOMI/UCB0SCL). */ MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, GPIO_PIN6 + GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION); sendStopCondition = false; sendToSlaveAddress2 = false; /* Initializing I2C Master to SMCLK at 400kbs with no autostop */ MAP_I2C_initMaster(EUSCI_B0_MODULE, &i2cConfig); /* Specify slave address. For start we will do our first slave address */ MAP_I2C_setSlaveAddress(EUSCI_B0_MODULE, SLAVE_ADDRESS_1); /* Set Master in receive mode */ MAP_I2C_setMode(EUSCI_B0_MODULE, EUSCI_B_I2C_TRANSMIT_MODE); /* Enable I2C Module to start operations */ MAP_I2C_enableModule(EUSCI_B0_MODULE); /* Enable and clear the interrupt flag */ MAP_I2C_clearInterruptFlag(EUSCI_B0_MODULE, EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_NAK_INTERRUPT); //Enable master Receive interrupt MAP_I2C_enableInterrupt(EUSCI_B0_MODULE, EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_NAK_INTERRUPT); MAP_Interrupt_enableInterrupt(INT_EUSCIB0); while (1) { /* Load Byte Counter */ TXByteCtr = 4; /* Making sure the last transaction has been completely sent out */ while (MAP_I2C_masterIsStopSent(EUSCI_B0_MODULE) == EUSCI_B_I2C_SENDING_STOP); /* Sending the initial start condition for appropriate * slave addresses */ if(sendToSlaveAddress2) { MAP_I2C_setSlaveAddress(EUSCI_B0_MODULE, SLAVE_ADDRESS_2); } else { MAP_I2C_setSlaveAddress(EUSCI_B0_MODULE, SLAVE_ADDRESS_1); } MAP_I2C_masterSendMultiByteStart(EUSCI_B0_MODULE, TXData++); while(sendStopCondition == false) { /* Go to sleep while data is being transmitted */ MAP_Interrupt_enableSleepOnIsrExit(); MAP_PCM_gotoLPM0InterruptSafe(); } sendStopCondition = false; } }