TMS320F280025: Half-duplex RS485 transceiver with SCI

Hi Wayne,

Thanks for your question! A direct way to check the TX buffer status in C2000Ware driverlib is using "SCI_getTxFIFOStatus()". See the below code snippet that does the opposite (waits until there is at least one byte available, meaning nearly full):

//
// Wait until space is available in the transmit FIFO.
//
while(SCI_getTxFIFOStatus(base) == SCI_FIFO_TX15)
{
}

You could instead use >= SCI_FIFO_TX0 to effectively wait "while the FIFO is not empty".

Regards,

Vince

Hi Wayne,

See the below function that checks if the transmit buffer has space for non-FIFO from C2000Ware. You can also find these functions and more in the "sci.h" and "sci.c" files in C2000Ware, which gives the other available functions/functionality on the SCI software!

//*****************************************************************************
//
//! Determines if there is any space in the transmit buffer when the FIFO
//! enhancement is not enabled.
//!
//! \param base is the base address of the SCI port.
//!
//! This function returns a flag indicating whether or not there is space
//! available in the transmit buffer when not using the FIFO enhancement.
//!
//! \return Returns \b true if there is space available in the transmit buffer
//! or \b false if there is no space available in the transmit buffer.
//
//*****************************************************************************
static inline bool
SCI_isSpaceAvailableNonFIFO(uint32_t base)
{
    //
    // Check the arguments.
    //
    ASSERT(SCI_isBaseValid(base));

    //
    // Return the availability of space.
    //
    return(((HWREGH(base + SCI_O_CTL2) & SCI_CTL2_TXRDY) ==
            SCI_CTL2_TXRDY) ? true : false);
}

Regards,

Vince