MPC5644A and MPC5644B different

[marklien]

What is the different between MPC5644A and MPC5644B ?

I am currently using MPC5644A, and using 2 UART (SCI_B_TX, SCI_B_RX, SCI_C_TX, SCI_C_RX) for communication.

Whein SCI_B and SCI_C both work in 2 second, the step will stop on below red char.

static void xxx_TxData( char* pBuf, const uint32_t cnt)

{

    uint16_t       j = 0;

    SIU.GPDO[192].R = 0x1;

    for (j=0; j< cnt; j++)

    {  /* Loop for character string */

        /* Wait for transmit data reg empty = 1 */

        //while (ESCI_B.SR.B.TDRE == 0) {}

        ESCI_B.SR.R = 0x80000000;              /* Clear TDRE flag */

        ESCI_B.DR.B.D = *(pBuf+j);          /* Transmit 8 bits Data */

while (ESCI_B.SR.B.TDRE == 0)

                {

                };        

    }

        for(j=0;j<900;j++)

        {}

        SIU.GPDO[192].R = 0;

Attached is the receive interrupt code.

Original Attachment has been moved to: code.txt.zip

[martin_kovar]

Hi,

it seems you clear TDRE flag in your receive interrupt handler. You must not clear RDRF flag by bit access.

Replace the following line in your interrupt handler:

ESCI_B.SR.B.RDRF = 0b1;

and use this code:

ESCI_B.SR.R = 0x2000;

Please look at the following picture, where the difference between .B and .R access is explained.

Regards,

Martin