1.27.25.4 1.34.25.4 1.35.18.4 TWIHSx_TransferSetup Function

C

/* x = TWIHS instance number */

/* TWIHS master mode */
bool TWIHSx_TransferSetup(TWIHS_TRANSFER_SETUP* setup, uint32_t srcClkFreq)

Summary

Dynamic setup of TWIHS Peripheral.

Description

This API is generally used when there are multiple clients on the same TWIHS bus having different clock speed. In such a case, the TWIHSx_TransferSetup API must be called to set the appropriate bus speed before starting the transfer for the I2C slave.

Precondition

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

Parameters

Param Description
setup Pointer to the structure containing the transfer setup.
srcClkFreq TWIHS Peripheral Clock Source Frequency.

Returns

true - Transfer setup was updated Successfully.

false - Failure while updating transfer setup.

Example

TWIHS_TRANSFER_SETUP setup;

setup.clkSpeed = 400000;

// Make sure that the TWIHS is not busy before changing the TWIHS clock frequency
if (TWIHS1_IsBusy() == false)
{
    if (TWIHS1_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.