1.35.17.3 TWIx_TransferSetup Function

C

/* x = TWI instance number */

/* TWI master mode */
bool TWIx_TransferSetup(TWI_TRANSFER_SETUP* setup, uint32_t srcClkFreq)

Summary

Dynamic setup of TWI Peripheral.

Description

This API is generally used when there are multiple clients on the same TWI bus having different clock speed. In such a case, the TWIx_TransferSetup API must be called to set the appropriate bus speed before starting the TWI transfer for the TWI slave.

Precondition

TWIx_Initialize must have been called for the associated TWI instance. The transfer status should not be busy.

Parameters

Returns

true - Transfer setup was updated Successfully.

false - Failure while updating transfer setup.

Example

TWI_TRANSFER_SETUP setup;

setup.clkSpeed = 400000;

// Make sure that the TWI is not busy before changing the TWI clock frequency
if (TWI1_IsBusy() == false)
{
    if (TWI1_TransferSetup( &setup, 0 ) == true)
    {
        // Transfer Setup updated successfully
    }
}

Remarks

srcClkFreq overrides any change in the peripheral clock frequency. If configured to zero PLIB takes the peripheral clock frequency from MHC.