SCI功能开发例程，串口通讯调试.zip

// TI File $Revision: /main/8 $ // Checkin $Date: August 15, 2007 09:45:52 $ //########################################################################### // // FILE: Example_2833xSci_FFDLB.c // // TITLE: DSP2833x Device SCI FIFO Digital Loop Back Test. // // ASSUMPTIONS: // // This program requires the DSP2833x header files. // // This program uses the internal loop back test mode of the peripheral. // Other then boot mode pin configuration, no other hardware configuration // is required. // // As supplied, this project is configured for "boot to SARAM" // operation. The 2833x Boot Mode table is shown below. // For information on configuring the boot mode of an eZdsp, // please refer to the documentation included with the eZdsp, // // $Boot_Table: // // GPIO87 GPIO86 GPIO85 GPIO84 // XA15 XA14 XA13 XA12 // PU PU PU PU // ========================================== // 1 1 1 1 Jump to Flash // 1 1 1 0 SCI-A boot // 1 1 0 1 SPI-A boot // 1 1 0 0 I2C-A boot // 1 0 1 1 eCAN-A boot // 1 0 1 0 McBSP-A boot // 1 0 0 1 Jump to XINTF x16 // 1 0 0 0 Jump to XINTF x32 // 0 1 1 1 Jump to OTP // 0 1 1 0 Parallel GPIO I/O boot // 0 1 0 1 Parallel XINTF boot // 0 1 0 0 Jump to SARAM <- "boot to SARAM" // 0 0 1 1 Branch to check boot mode // 0 0 1 0 Boot to flash, bypass ADC cal // 0 0 0 1 Boot to SARAM, bypass ADC cal // 0 0 0 0 Boot to SCI-A, bypass ADC cal // Boot_Table_End$ // // DESCRIPTION: // // This test uses the loopback test mode of the SCI module to send // characters starting with 0x00 through 0xFF. The test will send // a character and then check the receive buffer for a correct match. // // Watch Variables: // LoopCount Number of characters sent // ErrorCount Number of errors detected // SendChar Character sent // ReceivedChar Character recieved // // //########################################################################### // // Original Author: S.S. // // $TI Release: DSP2833x Header Files V1.01 $ // $Release Date: September 26, 2007 $ //########################################################################### #include "DSP2833x_Device.h" #include "DSP2833x_Examples.h" #define SCIB 1 #define SCIC 0 // Prototype statements for functions found within this file. void scib_loopback_init(void); void scib_fifo_init(void); void scib_xmit(int a); void scic_loopback_init(void); void scic_fifo_init(void); void scic_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; void main(void) { Uint16 SendChar; // 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(); // 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(); // 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; #if SCIB scib_fifo_init(); // Initialize the SCI FIFO scib_loopback_init(); // Initalize SCI #elif SCIC scic_fifo_init(); // Initialize the SCI FIFO scic_loopback_init(); // Initalize SCI #endif // 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(;;) { #if SCIB while(ScibRegs.SCIFFRX.bit.RXFFST == 0); { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO SendChar = ScibRegs.SCIRXBUF.all; scib_xmit(SendChar); while(ScibRegs.SCIFFTX.bit.TXFFST != 0); #elif SCIC while(ScicRegs.SCIFFRX.bit.RXFFST == 0); { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO SendChar = ScicRegs.SCIRXBUF.all; scic_xmit(SendChar); while(ScicRegs.SCIFFTX.bit.TXFFST != 0); #endif } } // 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,SCIB DLB, 8-bit word, baud rate 9.6K, default, 1 STOP bit, no parity void scib_loopback_init() { // Note: Clocks were turned on to the SCIB peripheral // in the InitSysCtrl() function 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.all =0x0003; ScibRegs.SCICTL2.bit.TXINTENA =1; ScibRegs.SCICTL2.bit.RXBKINTENA =1; ScibRegs.SCIHBAUD =0x0001; ScibRegs.SCILBAUD =0x00e7; ScibRegs.SCICCR.bit.LOOPBKENA =0; // Disable loop back ScibRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset } // Transmit a character from the SCI' void scib_xmit(int a) { ScibRegs.SCITXBUF=a; } // Initalize the SCI FIFO void scib_fifo_init() { ScibRegs.SCIFFTX.bit.TXFIFOXRESET=0; ScibRegs.SCIFFRX.bit.RXFIFORESET=0; ScibRegs.SCIFFTX.all=0xE040; ScibRegs.SCIFFRX.all=0x204f; ScibRegs.SCIFFCT.all=0x0; } // Test 1,SCIC DLB, 8-bit word, baud rate 9.6k, default, 1 STOP bit, no parity void scic_loopback_init() { // Note: Clocks were turned on to the SCIC peripheral // in the InitSysCtrl() function ScicRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback