/****************************************************************************************************
* @fn I2C_HardwareSetup
* Configures the GPIOs and h/w interface for the I2C bus
*
* @param busId - I2C bus identifier in case multiple buses are supported
*
* @return true if successful, false otherwise.
*
***************************************************************************************************/
osp_bool_t I2C_HardwareSetup( I2C_TypeDef *busId )
{
if (busId == LPC_I2C0)
{
if (sI2C_Bus1Initialized)
{
return true;
}
/* Configure the I2C interface in Master mode with the given speed */
Chip_IOCON_PinMuxSet(LPC_IOCON, I2C_SENSOR_BUS_SCL_PIN);
Chip_IOCON_PinMuxSet(LPC_IOCON, I2C_SENSOR_BUS_SDA_PIN);
Chip_I2C_Init(busId); /* Enables clock and resets the peripheral */
/* setup speed and config. as Master */
Chip_I2C_SetClockDiv( busId, I2C_MASTER_CLOCK_DIV );
Chip_I2CM_SetBusSpeed( busId, I2C_MCLOCK_SPEED );
/* Reset master state machine */
Chip_I2CM_Disable( busId );
Chip_I2CM_Enable( busId );
/* Enable interrupt for pending status */
Chip_I2C_EnableInt( busId, I2C_INTENSET_MSTPENDING );
I2C_Master_Initialise();
/* Configure TWI interrupts */
NVIC_SetPriority( I2C_SENSOR_BUS_IRQn, I2C_SENSOR_BUS_INT_PRIORITY );
NVIC_EnableIRQ( I2C_SENSOR_BUS_IRQn ); //enable I2C isr
sI2C_Bus1Initialized = true;
return true;
}
return false;
}
TempSensDig::TempSensDig(int deviceNumber, uint32_t speed) {
if(deviceNumber == 0) {
device = LPC_I2C0;
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 22, IOCON_DIGMODE_EN | I2C_MODE);
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 23, IOCON_DIGMODE_EN | I2C_MODE);
Chip_SWM_EnableFixedPin(SWM_FIXED_I2C0_SCL);
Chip_SWM_EnableFixedPin(SWM_FIXED_I2C0_SDA);
}
else {
// currently we support only I2C number 0
}
/* Enable I2C clock and reset I2C peripheral - the boot ROM does not
do this */
Chip_I2C_Init(device);
/* Setup clock rate for I2C */
Chip_I2C_SetClockDiv(device, I2C_CLK_DIVIDER);
/* Setup I2CM transfer rate */
Chip_I2CM_SetBusSpeed(device, speed);
/* Enable Master Mode */
Chip_I2CM_Enable(device);
}
