我的源代码：
#include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"
void delay_loop(void);
void spi_xmit(Uint16 a);
void spi_fifo_init(void);
void spi_init(void);
interrupt void cpu_timer0_isr(void);
//interrupt void cpu_timer0_isr(void);
Uint16 sdata; // send data
Uint16 rdata;
short Hrdata,Lrdata; // received data
float temp;
/***********************/
void scia_loopback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void error(int);
interrupt void scia_rx_isr(void);
interrupt void scia_tx_isr(void);
// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount,i,j;
int n=0;
void main(void)
{
Uint16 SendChar;
Uint16 ReceivedChar;
// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
// This function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Select GPIO for the device or for the specific application:
// This function is found in the DSP2833x_Gpio.c file.
// InitGpio(); skip this as this is example selects the I/O
// for SCI-A in this file itself
InitSciGpio();
InitSpiaGpio();
// 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 DSP2833x_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 DSP2833x_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 DSP2833x_PieVect.c.
// This function populates the PIE vector table with pointers
// to the shell ISR functions found in DSP2833x_DefaultIsr.c.
InitPieVectTable();
EALLOW;
PieVectTable.TINT0=&cpu_timer0_isr;
EDIS;
InitCpuTimers();
ConfigCpuTimer(&CpuTimer0,150,1000);//800us
StartCpuTimer0();
IER|=M_INT1;
PieCtrlRegs.PIEIER1.bit.INTx7=1;
EINT;
ERTM;
// CpuTimer0Regs.TCR.bit.TSS=0;
// Enable CPU and PIE interrupts
// This example function is found in the DSP2833x_PieCtrl.c file.
//EnableInterrupts();
// Step 4. Initialize all the Device Peripherals to a known state:
// This function is found in DSP2833x_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
spi_fifo_init(); // Initialize the Spi FIFO
spi_init();
// Note: Autobaud lock is not required for this example
// Send a character starting with 0
SendChar = 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(;;)
{
while(CpuTimer0.InterruptCount<3);
CpuTimer0.InterruptCount=0;
spi_xmit(0x0400);
while(SpiaRegs.SPIFFRX.bit.RXFFST !=1) {}
rdata = SpiaRegs.SPIRXBUF;
Hrdata=(rdata>>8);
Lrdata=(rdata&0x00ff);
rdata =rdata&0x3fff;
scia_xmit(Hrdata);
scia_xmit(Lrdata);
// while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO
// Check received character
// ReceivedChar = SciaRegs.SCIRXBUF.all;
// if(ReceivedChar != SendChar) error(1);
// Move to the next character and repeat the test
// SendChar++;
// Limit the character to 8-bits
// SendChar &= 0x00FF;
LoopCount++;
for(i=0;i<=10000;i++)
{for(j=0;j<150;j++);}
EALLOW;
SysCtrlRegs.WDKEY=0xAA;
EDIS;
}
}
interrupt void cpu_timer0_isr(void)
{
CpuTimer0.InterruptCount++;
n++;
EALLOW;
SysCtrlRegs.WDKEY=0x55;
EDIS;
PieCtrlRegs.PIEACK.all=PIEACK_GROUP1;
}
// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
void error(int ErrorFlag)
{
Uint16 Error = ErrorFlag;
ErrorCount++;
// asm(" ESTOP0"); // Uncomment to stop the test here
// for (;;);
}
// 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 =1; // Enable 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 delay_loop()
{
long i;
for (i = 0; i < 100000; i++) {}
}
void spi_init()
{
SpiaRegs.SPICCR.bit.SPISWRESET = 0;
SpiaRegs.SPICCR.all =0x004F; // Reset on, rising edge, 16-bit char bits
SpiaRegs.SPICTL.all =0x0006; // Enable master mode, normal phase,
// enable talk, and SPI int disabled.
SpiaRegs.SPIBRR =0x007F;
// SpiaRegs.SPICCR.all =0x008F; // Relinquish SPI from Reset
// SpiaRegs.SPIPRI.bit.FREE = 1; // Set so breakpoints don't disturb xmission
SpiaRegs.SPICCR.bit.SPISWRESET = 1;
}
void spi_xmit(Uint16 a)
{
SpiaRegs.SPITXBUF=a;
}
void spi_fifo_init()
{
// Initialize SPI FIFO registers
SpiaRegs.SPIFFTX.all=0xE040;
SpiaRegs.SPIFFRX.all=0x204F;
SpiaRegs.SPIFFCT.all=0x0;
}
//===========================================================================
// No more.
//===========================================================================
为什么串口传输接收的数据总是不对 |
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