Example_281xSci_FFDLB_int.c
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- //###########################################################################
- //
- // FILE: Example_281xSci_FFDLB_int.c
- //
- // TITLE: DSP281x Device SCI Digital Loop Back porgram.
- //
- //
- // ASSUMPTIONS:
- //
- // This program requires the DSP281x V1.00 header files.
- // As supplied, this project is configured for "boot to H0" operation.
- //
- // Other then boot mode pin configuration, no other hardware configuration
- // is required.
- //
- // DESCRIPTION:
- //
- // This program is a SCI example that uses the internal loopback of
- // the peripheral. Both interrupts and the SCI FIFOs are used.
- //
- // A stream of data is sent and then compared to the recieved stream.
- //
- // The SCI-A sent data looks like this:
- // 00 01 02 03 04 05 06 07
- // 01 02 03 04 05 06 07 08
- // 02 03 04 05 06 07 08 09
- // ....
- // FE FF 00 01 02 03 04 05
- // FF 00 01 02 03 04 05 06
- // etc..
- //
- //
- // The SCI-B sent data looks like this:
- // FF FE FD FC FB FA F9 F8
- // FE FD FC FB FA F9 F8 F7
- // FD FC FB FA F9 F8 F7 F6
- // ....
- // 01 00 FF FE FD FC FB FA
- // 00 FF FE FD FC FB FA F9
- // etc..
- //
- // Both patterns are repeated forever.
- //
- // Watch Variables:
- //
- // SCI-A SCI-B
- // ----------------------
- // sdataA sdataB Data being sent
- // rdataA rdataB Data received
- // rdata_pointA rdata_pointB Keep track of where we are in the datastream
- // This is used to check the incoming data
- //###########################################################################
- // Original Source by S.D.
- //
- // Ver | dd mmm yyyy | Who | Description of changes
- // =====|=============|======|===============================================
- // 1.00| 11 Sep 2003 | L.H. | EzDSP Alpha Release
- //###########################################################################
- #include "DSP281x_Device.h" // DSP281x Headerfile Include File
- #include "DSP281x_Examples.h" // DSP281x Examples Include File
- #define CPU_FREQ 150E6
- #define SCI_FREQ 100E3
- #define SCI_PRD CPU_FREQ/(SCI_FREQ*8)
- // 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[8]; // Send data for SCI-A
- Uint16 sdataB[8]; // Send data for SCI-B
- Uint16 rdataA[8]; // Received data for SCI-A
- Uint16 rdataB[8]; // Received data for SCI-A
- Uint16 rdata_pointA; // Used for checking the received data
- Uint16 rdata_pointB;
- void main(void)
- {
- Uint16 i;
- // Step 1. Initialize System Control:
- // PLL, WatchDog, enable Peripheral Clocks
- // This example function is found in the DSP281x_SysCtrl.c file.
- InitSysCtrl();
- // Step 2. Initalize GPIO:
- // This example function is found in the DSP281x_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
- EALLOW;
- GpioMuxRegs.GPFMUX.bit.SCITXDA_GPIOF4 = 1;
- GpioMuxRegs.GPFMUX.bit.SCIRXDA_GPIOF5 = 1;
- GpioMuxRegs.GPGMUX.bit.SCITXDB_GPIOG4 = 1;
- GpioMuxRegs.GPGMUX.bit.SCIRXDB_GPIOG5 = 1;
- EDIS;
- // 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 DSP281x_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 DSP281x_DefaultIsr.c.
- // This function is found in DSP281x_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.RXAINT = &sciaRxFifoIsr;
- PieVectTable.TXAINT = &sciaTxFifoIsr;
- PieVectTable.RXBINT = &scibRxFifoIsr;
- PieVectTable.TXBINT = &scibTxFifoIsr;
- EDIS; // This is needed to disable write to EALLOW protected registers
-
-
- // Step 4. Initialize all the Device Peripherals:
- // This function is found in DSP281x_InitPeripherals.c
- // InitPeripherals(); // Not required for this example
- scia_fifo_init(); // Init SCI-A
- scib_fifo_init(); // Init SCI-B
-
- // 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<8; i++)
- {
- sdataA[i] = i;
- }
- for(i = 0; i<8; i++)
- {
- sdataB[i] = 0xFF - i;
- }
- rdata_pointA = sdataA[0];
- rdata_pointB = sdataB[0];
-
- // Enable interrupts required for this example
- PieCtrlRegs.PIECRTL.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
- PieCtrlRegs.PIEIER9.bit.INTx3=1; // PIE Group 9, INT3
- PieCtrlRegs.PIEIER9.bit.INTx4=1; // PIE Group 9, INT4
- 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< 8; i++)
- {
- SciaRegs.SCITXBUF=sdataA[i]; // Send data
- }
- for(i=0; i< 8; i++) //Increment send data for next cycle
- {
- sdataA[i] = (sdataA[i]+1) & 0x00FF;
- }
- SciaRegs.SCIFFTX.bit.TXINTCLR=1; // Clear SCI Interrupt flag
- PieCtrlRegs.PIEACK.all|=0x100; // Issue PIE ACK
- }
- interrupt void sciaRxFifoIsr(void)
- {
- Uint16 i;
- for(i=0;i<8;i++)
- {
- rdataA[i]=SciaRegs.SCIRXBUF.all; // Read data
- }
- for(i=0;i<8;i++) // Check received data
- {
- if(rdataA[i] != ( (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=0xC028;
- SciaRegs.SCIFFRX.all=0x0028;
- SciaRegs.SCIFFCT.all=0x00;
- SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
- SciaRegs.SCIFFTX.bit.TXFIFOXRESET=1;
- SciaRegs.SCIFFRX.bit.RXFIFORESET=1;
-
-
- }
- interrupt void scibTxFifoIsr(void)
- {
- Uint16 i;
- for(i=0; i< 8; i++)
- {
- ScibRegs.SCITXBUF=sdataB[i]; // Send data
- }
- for(i=0; i< 8; i++) //Increment send data for next cycle
- {
- sdataB[i] = (sdataB[i]-1) & 0x00FF;
- }
- ScibRegs.SCIFFTX.bit.TXINTCLR=1; // Clear Interrupt flag
- PieCtrlRegs.PIEACK.all|=0x100; // Issue PIE ACK
- }
- interrupt void scibRxFifoIsr(void)
- {
- Uint16 i;
- for(i=0;i<8;i++)
- {
- rdataB[i]=ScibRegs.SCIRXBUF.all; // Read data
- }
- for(i=0;i<8;i++) // Check received data
- {
- if(rdataB[i] != ( (rdata_pointB-i) & 0x00FF) ) error();
- }
- rdata_pointB = (rdata_pointB-1) & 0x00FF;
-
- ScibRegs.SCIFFRX.bit.RXFFOVRCLR=1; // Clear Overflow flag
- ScibRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag
- PieCtrlRegs.PIEACK.all|=0x100; // Issue PIE ack
- }
- void scib_fifo_init()
- {
- ScibRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
- // No parity,8 char bits,
- // async mode, idle-line protocol
- ScibRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
- // Disable RX ERR, SLEEP, TXWAKE
- ScibRegs.SCICTL2.bit.TXINTENA =1;
- ScibRegs.SCICTL2.bit.RXBKINTENA =1;
- ScibRegs.SCIHBAUD =0x0000;
- ScibRegs.SCILBAUD =SCI_PRD;
- ScibRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
- ScibRegs.SCIFFTX.all=0xC028;
- ScibRegs.SCIFFRX.all=0x0028;
- ScibRegs.SCIFFCT.all=0x00;
- ScibRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
- ScibRegs.SCIFFTX.bit.TXFIFOXRESET=1;
- ScibRegs.SCIFFRX.bit.RXFIFORESET=1;
-
- }
- //===========================================================================
- // No more.
- //===========================================================================