DSPF28335串口程序

#include "DSP28x_Project.h" // Device Headerfile and Examples Include File

// Prototype statements for functions found within this file.
void scia_echoback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void scia_msg(char *msg);
void scia_gpio_init(void);
char Rx[100];

// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;

void main(void)
{

Uint16 ReceivedChar;
char *msg;
int i;
InitSysCtrl();

//InitSciaGpio();
scia_gpio_init();

DINT;

InitPieCtrl();

IER = 0x0000;
IFR = 0x0000;

InitPieVectTable();

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2802x_InitPeripherals.c
// InitPeripherals(); // Not required for this example

// Step 5. User specific code:

LoopCount = 0;
ErrorCount = 0;

scia_fifo_init(); // Initialize the SCI FIFO
scia_echoback_init(); // Initalize SCI for echoback

msg = "\r\n\n\nHello World!\0";
scia_msg(msg);

msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
scia_msg(msg);

for(;;)
{
msg = "\r\nEnter a character: \0";
scia_msg(msg);

// Wait for inc character
//加的
for(i=0;i<8;i++)
{

while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state

// Get character
ReceivedChar = SciaRegs.SCIRXBUF.all;
Rx[i]=ReceivedChar;
}
// Echo character back
msg = " You sent: \0";
scia_msg(msg);
scia_msg(Rx);

LoopCount++;
}

}

// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scia_echoback_init()
{
// Note: Clocks were turned on to the SCIA peripheral
// in the InitSysCtrl() function

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

// SCI BRR = LSPCLK/(SCI BAUDx8) - 1
#if (CPU_FRQ_60MHZ)
SciaRegs.SCIHBAUD =0x0000; // 9600 baud @LSPCLK = 15MHz (60 MHz SYSCLK).
SciaRegs.SCILBAUD =0x00C2;
#elif (CPU_FRQ_50MHZ)
SciaRegs.SCHBAUD =0x0000; // 9600 baud @LSPCLK = 12.5 MHz (50 MHz SYSCLK)
#elif (CPU_FRQ_40MHZ) =0x00A1;
SciaRegs.SCIHBAUD =0x0000; // 9600 baud @LSPCLK = 10MHz (40 MHz SYSCLK).
SciaRegs.SCILBAUD =0x0081;
#endif

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

// Transmit a character from the SCI
void scia_xmit(int a)
{
while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
Scia

Regs.SCITXBUF=a;

}

void scia_msg(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
scia_xmit(msg[i]);
i++;
}
}

// Initalize the SCI FIFO
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all=0xE040;
SciaRegs.SCIFFRX.all=0x2044;
SciaRegs.SCIFFCT.all=0x0;

}
void scia_gpio_init(void)
{
EALLOW;
GpioCtrlRegs.GPAMUX2.bit.GPIO28=1;
GpioCtrlRegs.GPAMUX2.bit.GPIO29=1;
GpioCtrlRegs.GPAQSEL2.bit.GPIO28=3;
GpioCtrlRegs.GPAPUD.bit.GPIO28=0;
GpioCtrlRegs.GPAPUD.bit.GPIO29=0;
EDIS;


}
//===========================================================================
// No more.
//===========================================================================