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CCS/TMS320F28377D: SCI Cannot work at power up but it can work after push down reset button

Alvin
Prodigy 150 points

Part Number: TMS320F28377D

Tool/software: Code Composer Studio

Hi 

SCI Cannot work at power up but it can work after push down reset button, ie. after reset it works.

And it works during debug phase using J-tag.

It occurred when I using LaunchPad and my own control board.

below is my code:

 #define SCIRegs SciaRegs

SCIRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback// No parity,8 char bits,// async mode, idle-line protocol
SCIRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,// Disable RX ERR, SLEEP, TXWAKE
SCIRegs.SCICTL2.all =0x0003;
SCIRegs.SCICTL2.bit.TXINTENA = 0;
SCIRegs.SCICTL2.bit.RXBKINTENA = 0;

// C7h = 31250 baud @ LSPCLK = 200/4 MHz SCIHBAUD 0x2 SCILBAUD 0x8B 9600
// BRR = LSPCLK / (SCI Asynchronous Baud * 8) - 1

SCIRegs.SCIHBAUD.all = 0x0000; //0x2;
SCIRegs.SCILBAUD.all = 0x00C7; //0x8B;

SCIRegs.SCIFFTX.all= 0x8040; // DISable FIFO enhancement
SCIRegs.SCIFFRX.all= 0x204f;
SCIRegs.SCIFFCT.all=0x0;

SCIRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset

Look forward to your kind feedback.

Best Regards,
Alvin