/* 2812A板：
使用直连的串口通信电缆;
启动串口调试助手.exe;
PC机发送一个"."为结束标志
*/
#include "DSP281x_Device.h"
#include "DSP281x_Examples.h"
// Prototype statements for functions found within this file.
void scia_loopback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void error(int);
void wait(int nWait);
interrupt void scia_rx_isr(void);
interrupt void scia_tx_isr(void);
// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;
char cString[17]={ "Hello PC!,Over|" },cReceive,cBuffer[17],cAnswer[16]={"Oh,you say"};
void main(void)
{
char ReceivedChar;
int i,k=0,nLen,bReceive=0;
// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
// This function is found in the DSP281x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Select GPIO for the device or for the specific application:
// This function is found in the DSP281x_Gpio.c file.
// InitGpio(); skip this as this is example selects the I/O for SCI in this file itself
EALLOW;
GpioMuxRegs.GPFMUX.all=0x0030; // Select GPIOs to be Sci pins
// Port F MUX - x000 0000 0011 0000
EDIS;
// Step 3. Initialize PIE vector table:
// The PIE vector table is initialized with pointers to shell Interrupt
// Service Routines (ISR). The shell routines are found in DSP281x_DefaultIsr.c.
// Insert user specific ISR code in the appropriate shell ISR routine in
// the DSP28_DefaultIsr.c file.
// Disable and clear all CPU interrupts:
DINT;
IER = 0x0000;
IFR = 0x0000;
// Initialize Pie Control Registers To Default State:
// This function is found in the DSP281x_PieCtrl.c file.
// InitPieCtrl(); PIE is not used for this example
// Initialize the PIE Vector Table To a Known State:
// This function is found in DSP281x_PieVect.c.
// This function populates the PIE vector table with pointers
// to the shell ISR functions found in DSP281x_DefaultIsr.c.
InitPieVectTable();
// Enable CPU and PIE interrupts
// This example function is found in the DSP281x_PieCtrl.c file.
EnableInterrupts();
// Step 4. Initialize all the Device Peripherals to a known state:
// This function is found in DSP281x_InitPeripherals.c
// InitPeripherals(); skip this for SCI tests
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
LoopCount = 0;
ErrorCount = 0;
scia_fifo_init(); // Initialize the SCI FIFO
scia_loopback_init(); // Initalize SCI for digital loop back
// Note: Autobaud lock is not required for this example
// Send a character starting with 0
// Step 6. Send Characters forever starting with 0x00 and going through
// 0xFF. After sending each, check the recieve buffer for the correct value
for ( i=0;i<16;i++ )
{
scia_xmit(cString[i]);
while(SciaRegs.SCIFFTX.bit.TXFFST !=0) { }
//wait(1024);
}
for(;;)
{
if ( bReceive==1 )
{for ( i=0;i<10;i++ )
{
scia_xmit(cAnswer[i]);
while(SciaRegs.SCIFFTX.bit.TXFFST !=0) { }
}
scia_xmit('\"');
for ( i=0;i<nLen;i++ )
{
scia_xmit(cBuffer[i]);
while(SciaRegs.SCIFFTX.bit.TXFFST !=0) { }
}
scia_xmit('\"');
wait(1024);
for ( i=9;i<16;i++ )
{
scia_xmit(cString[i]);
while(SciaRegs.SCIFFTX.bit.TXFFST !=0) { }
}
}
k=0; bReceive=0;
while(1)
{
while(SciaRegs.SCIFFRX.bit.RXFIFST ==0)
{ } // 如果接受寄存器不为0则跳出
ReceivedChar = SciaRegs.SCIRXBUF.all;
cBuffer[k]=ReceivedChar;
if ( ReceivedChar=='.')
{
cBuffer[k+1]='\0';
nLen=k+1;
bReceive=1;
break;
}
k++; k%=16;
}
}
}
// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
void error(int ErrorFlag)
{
ErrorCount++;
}
// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scia_loopback_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;
SciaRegs.SCIHBAUD =0x0001;
SciaRegs.SCILBAUD =0x00e7;
SciaRegs.SCICCR.bit.LOOPBKENA =0; // disable loop back
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
// Transmit a character from the SCI'
void scia_xmit(int a)
{
SciaRegs.SCITXBUF=a;
}
// Initalize the SCI FIFO
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all=0xE040;
SciaRegs.SCIFFRX.all=0x204f;
SciaRegs.SCIFFCT.all=0x0;
}
void wait(int nWait)
{
int i,j,k=0;
for ( i=0;i<nWait;i++ )
for ( j=0;j<64;j++ )
k++;
}
//===========================================================================
// No more.
//===========================================================================
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