This is my program which enable the sci _c to communicate with peripherals.It works but when the 28377 read more than a word,the fact of program is showed below in the pictures.I hope someone who can help me to find the errors i have made,than you very much! By the way,the program is about the RS485.
2728.Example_28X7xSci_Echoback.c
//########################################################################### // FILE: Example_28X7xSci_Echoback.c // TITLE: SCI Echoback. // //! \addtogroup cpu01_example_list //! <h1>SCI Echoback</h1> //! //! This test receives and echo-backs data through the SCI-A port. //! //! The PC application 'hypterterminal' can be used to view the data //! from the SCI and to send information to the SCI. Characters received //! by the SCI port are sent back to the host. //! //! \b Running \b the \b Application //! -# Configure hyperterminal: //! Use the included hyperterminal configuration file SCI_96.ht. //! To load this configuration in hyperterminal //! -# Open hyperterminal //! -# Go to file->open //! -# Browse to the location of the project and //! select the SCI_96.ht file. //! -# Check the COM port. //! The configuration file is currently setup for COM1. //! If this is not correct, disconnect (Call->Disconnect) //! Open the File-Properties dialog and select the correct COM port. //! -# Connect hyperterminal Call->Call //! and then start the 2806x SCI echoback program execution. //! -# The program will print out a greeting and then ask you to //! enter a character which it will echo back to hyperterminal. //! //! \note If you are unable to open the .ht file, you can create //! a new one with the following settings //! - Find correct COM port //! - Bits per second = 9600 //! - Date Bits = 8 //! - Parity = None //! - Stop Bits = 1 //! - Hardware Control = None //! //! \b Watch \b Variables \n //! - \b LoopCount, for the number of characters sent //! - ErrorCount //! //! \b External \b Connections \n //! Connect the SCI-A port to a PC via a transceiver and cable. //! - GPIO28 is SCI_A-RXD (Connect to Pin3, PC-TX, of serial DB9 cable) //! - GPIO29 is SCI_A-TXD (Connect to Pin2, PC-RX, of serial DB9 cable) // //########################################################################### // $TI Release: F2837xD Support Library v110 $ // $Release Date: Mon Apr 7 10:35:37 CDT 2014 $ //########################################################################### #include "F28x_Project.h" // Device Headerfile and Examples Include File // Prototype statements for functions found within this file. void scia_echoback_init(void); void scia_fifo_init(void); void scia_xmit(int a); void scia_msg(char *msg); // Global counts used in this example Uint16 LoopCount; Uint16 ErrorCount; void main(void) { Uint16 ReceivedChar; char *msg; // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the F2837xD_SysCtrl.c file. InitSysCtrl(); // Step 2. Initialize GPIO: // This example function is found in the F2837xD_Gpio.c file and // illustrates how to set the GPIO to it's default state. InitGpio(); // For this example, only init the pins for the SCI-A port. // These functions are found in the F2837xD_Gpio.c file. GPIO_SetupPinMux(57, GPIO_MUX_CPU1, 6); GPIO_SetupPinOptions(57, GPIO_INPUT, GPIO_ASYNC); GPIO_SetupPinMux(56, GPIO_MUX_CPU1, 6); GPIO_SetupPinOptions(56, GPIO_OUTPUT, GPIO_ASYNC); // 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 F2837xD_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 F2837xD_DefaultIsr.c. // This function is found in F2837xD_PieVect.c. InitPieVectTable(); // Step 4. Initialize all the Device Peripherals: // This function is found in F2837xD_InitPeripherals.c // InitPeripherals(); // Not required for this example // Step 5. User specific code: LoopCount = 0; ErrorCount = 0; EALLOW; CpuSysRegs.PCLKCR7.bit.SCI_C = 1; scia_fifo_init(); // Initialize the SCI FIFO scia_echoback_init(); // Initialize SCI for echoback EDIS; //GpioDataRegs.GPBSET.bit.GPIO55=1; msg = "\r\n\n\nHello World!\0"; scia_msg(msg); msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0"; scia_msg(msg); for(;;) { int i=0; msg = "\r\nEnter a character: \0"; scia_msg(msg); //GpioDataRegs.GPBCLEAR.bit.GPIO56=1; GpioDataRegs.GPBSET.bit.GPIO56=1; // Wait for inc character while(ScicRegs.SCIFFRX.bit.RXFFST ==0) { } // wait for XRDY =1 for empty state // Get character //ReceivedChar = ScicRegs.SCIRXBUF.all; msg = " You sent: \0"; scia_msg(msg); //scia_xmit(ReceivedChar); GpioDataRegs.GPBSET.bit.GPIO56=1; do { /*for(j=0;j<10000;j++) {}*/ //GpioDataRegs.GPBCLEAR.bit.GPIO56=1; ReceivedChar = ScicRegs.SCIRXBUF.all; // Echo character back scia_xmit(ReceivedChar); GpioDataRegs.GPBSET.bit.GPIO56=1; /*for(j=0;j<10000;j++) { }*/ i++; }while(ScicRegs.SCIFFRX.bit.RXFFST != 0);/**/ LoopCount++; } // Echo character back /* msg = " You sent: \0"; scia_msg(msg); scia_xmit(ReceivedChar);*/ //} } // Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity void scia_echoback_init() { // Note: Clocks were turned on to the SCIA peripheral // in the InitSysCtrl() function ScicRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback // No parity,8 char bits, // async mode, idle-line protocol ScicRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK, // Disable RX ERR, SLEEP, TXWAKE //ScicRegs.SCICTL2.all =0x0003; ScicRegs.SCICTL2.bit.TXINTENA =1; ScicRegs.SCICTL2.bit.RXBKINTENA =1; //ScicRegs.SCICCR.bit.LOOPBKENA =1; ScicRegs.SCIHBAUD =0x0002; // 9600 baud @LSPCLK = 50MHz (200 MHz SYSCLK). ScicRegs.SCILBAUD =0x008B; ScicRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset ScicRegs.SCIFFTX.bit.TXFIFOXRESET=1; ScicRegs.SCIFFRX.bit.RXFIFORESET=1; } // Transmit a character from the SCI void scia_xmit(int a) { while (ScicRegs.SCIFFTX.bit.TXFFST != 0) {} ScicRegs.SCITXBUF=a; } void scia_msg(char * msg) { int i; i = 0; while(msg[i] != '\0') { scia_xmit(msg[i]); i++; } } // Initialize the SCI FIFO void scia_fifo_init() { //ScicRegs.SCIFFTX.all=0xC022; //ScicRegs.SCIFFRX.all=0x0022; ScicRegs.SCIFFTX.all=0xE040; ScicRegs.SCIFFRX.all=0x204f; ScicRegs.SCIFFCT.all=0x0; } //=========================================================================== // No more. //===========================================================================