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sci_loopback_int的例程（中断程序）
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例程代碼如下：
#include "DSP28x_Project.h"? ???// Device Headerfile and Examples Include File
#define CPU_FREQ ? ? ? ? 40E6? ?? ???// Default = 40 MHz. Change to 60E6 for 60 MHz devices
#define LSPCLK_FREQ CPU_FREQ/4
#define SCI_FREQ ? ? ? ? 100E3
#define SCI_PRD ? ? ? ? (LSPCLK_FREQ/(SCI_FREQ*8))-1
// Prototype statements for functions found within this file.
interrupt void sciaTxFifoIsr(void);
interrupt void sciaRxFifoIsr(void);
interrupt void scibTxFifoIsr(void);
interrupt void scibRxFifoIsr(void);
void scia_fifo_init(void);
void scib_fifo_init(void);
void error(void);
// Global variables
Uint16 sdataA[2];? ? // Send data for SCI-A
Uint16 rdataA[2];? ? // Received data for SCI-A
Uint16 rdata_pointA; // Used for checking the received data
void main(void)
{
? ?Uint16 i;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2802x_SysCtrl.c file.
? ?InitSysCtrl();
// Step 2. Initalize GPIO:
// This example function is found in the DSP2802x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();
// Setup only the GP I/O only for SCI-A and SCI-B functionality
// This function is found in DSP2802x_Sci.c
? ?InitSciGpio();
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
? ?DINT;
// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2802x_PieCtrl.c file.
? ?InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags:
? ?IER = 0x0000;
? ?IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.??This is useful for debug purposes.
// The shell ISR routines are found in DSP2802x_DefaultIsr.c.
// This function is found in DSP2802x_PieVect.c.
? ?InitPieVectTable();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
? ?EALLOW;? ? ? ? // This is needed to write to EALLOW protected registers
? ?PieVectTable.SCIRXINTA = &sciaRxFifoIsr;
? ?PieVectTable.SCITXINTA = &sciaTxFifoIsr;
? ?EDIS;? ?// This is needed to disable write to EALLOW protected registers
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2802x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
? ?scia_fifo_init();??// Init SCI-A
// Step 5. User specific code, enable interrupts:
// Init send data.??After each transmission this data
// will be updated for the next transmission
? ?for(i = 0; i<2; i++)
? ?{
? ?? ?sdataA?= i;
? ?}
? ?rdata_pointA = sdataA[0];
// Enable interrupts required for this example
? ?PieCtrlRegs.PIECTRL.bit.ENPIE = 1;? ?// Enable the PIE block
? ?PieCtrlRegs.PIEIER9.bit.INTx1=1;? ???// PIE Group 9, INT1
? ?PieCtrlRegs.PIEIER9.bit.INTx2=1;? ???// PIE Group 9, INT2
? ?IER = 0x100;? ? ? ? // Enable CPU INT
? ?EINT;
// Step 6. IDLE loop. Just sit and loop forever (optional):
? ? ? ? for(;;);
}
void error(void)
{
? ? asm("? ???ESTOP0"); // Test failed!! Stop!
? ? for (;;);
}
interrupt void sciaTxFifoIsr(void)
{
? ? Uint16 i;
? ? for(i=0; i< 2; i++)
? ? {
? ? ? ?? ? SciaRegs.SCITXBUF=sdataA;? ???// Send data
? ? ? ? }
? ? for(i=0; i< 2; i++)? ?? ?? ?? ?? ???//Increment send data for next cycle
? ? {
? ? ? ?? ? sdataA?= (sdataA+1) & 0x00FF;
? ? ? ? }
? ? ? ? SciaRegs.SCIFFTX.bit.TXFFINTCLR=1;? ? ? ? // Clear SCI Interrupt flag
? ? ? ? PieCtrlRegs.PIEACK.all|=0x100;? ?? ?// Issue PIE ACK
}
interrupt void sciaRxFifoIsr(void)
{
? ? Uint16 i;
? ? ? ? for(i=0;i<2;i++)
? ? ? ? {
? ? ? ?? ? rdataA=SciaRegs.SCIRXBUF.all;? ? ? ???// Read data
? ? ? ? }
? ? ? ? for(i=0;i<2;i++)? ?? ?? ?? ?? ?? ?? ?// Check received data
? ? ? ? {
? ? ? ?? ? if(rdataA?!= ( (rdata_pointA+i) & 0x00FF) ) error();
? ? ? ? }
? ? ? ? rdata_pointA = (rdata_pointA+1) & 0x00FF;
? ? ? ? SciaRegs.SCIFFRX.bit.RXFFOVRCLR=1;? ?// Clear Overflow flag
? ? ? ? SciaRegs.SCIFFRX.bit.RXFFINTCLR=1;? ?// Clear Interrupt flag
? ? ? ? PieCtrlRegs.PIEACK.all|=0x100;? ?? ? // Issue PIE ack
}
void scia_fifo_init()
{
? ?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.bit.TXINTENA =1;
? ?SciaRegs.SCICTL2.bit.RXBKINTENA =1;
? ?SciaRegs.SCIHBAUD = 0x0000;
? ?SciaRegs.SCILBAUD = SCI_PRD;
? ?SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
? ?SciaRegs.SCIFFTX.all=0xC022;
? ?SciaRegs.SCIFFRX.all=0x0022;
? ?SciaRegs.SCIFFCT.all=0x00;
? ?SciaRegs.SCICTL1.all =0x0023;? ???// Relinquish SCI from Reset
? ?SciaRegs.SCIFFTX.bit.TXFIFOXRESET=1;
? ?SciaRegs.SCIFFRX.bit.RXFIFORESET=1;
}
//===========================================================================
// No more.
//===========================================================================
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