DSP

28335无法进入SCI FIFO中断问题探究

2019-07-13 11:58发布

站内文章 / DSP
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class="markdown_views prism-atom-one-light"> 问题的关键在于SCIFFTX，SCIFFRX的bit一定要置1 #include "DSP28x_Project.h" // Device Headerfile and Examples Include File // Prototype statements for functions found within this file. void Scic_loopback_init(void); void Scic_fifo_init(void); void Scic_xmit(int a); int Scic_recv(void); void error(); __interrupt void scicTxFifoIsr(void); __interrupt void scicRxFifoIsr(void); // Global counts used in this example Uint16 LoopCount; Uint16 ErrorCount; Uint16 ReceivedChar; Uint16 sdataB[8]; // Send data for SCI-B Uint16 rdataB[8]; // Received data for SCI-A void main(void) { Uint16 i; // 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; InitPieCtrl(); 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; // This is needed to write to EALLOW protected registers PieVectTable.SCIRXINTC = &scicRxFifoIsr; PieVectTable.SCITXINTC = &scicTxFifoIsr; EDIS; // This is needed to disable write to EALLOW protected registers // Enable CPU and PIE interrupts // This example function is found in the DSP2833x_PieCtrl.c file. PieCtrlRegs.PIECTRL.bit.ENPIE = 1; PieCtrlRegs.PIEIER8.bit.INTx5=1; // PIE Group 9, int1 PieCtrlRegs.PIEIER8.bit.INTx6=1; // PIE Group 9, INT2 IER|=M_INT8; // Enable CPU INT EINT; // 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; for(i = 0; i<8; i++) { sdataB[i] = 0xFF - i; } Scic_loopback_init(); // Initialize SCI for digital loop back // Step 6. Send Characters forever starting with 0x00 and going through // 0xFF. After sending each, check the receive buffer for the correct value for(;;) { LoopCount++; } } // Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here: void error() { ErrorCount++; __asm(" ESTOP0"); // Uncomment to stop the test here for (;;); } // Test 1,Scic DLB, 8-bit word, baud rate 0x000F, 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 // 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.SCIHBAUD =0x0001; ScicRegs.SCILBAUD =0x00E7; ScicRegs.SCIFFTX.all =0xE060; //bit5一定要置1使能中断，bit4~bit0表示缓冲多少个字节进中断 ScicRegs.SCIFFRX.all =0x2068; //bit5一定要置1使能中断，bit4~bit0表示缓冲多少个字节进中断 ScicRegs.SCIFFCT.all =0x0; ScicRegs.SCIFFTX.bit.TXFIFOXRESET=1;//重新使能发送fifo操作 ScicRegs.SCIFFRX.bit.RXFIFORESET=1; //重新使能接收fifo操作 ScicRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset 重启sci } // Transmit a character from the SCI' void Scic_xmit(int a) { while(ScicRegs.SCICTL2.bit.TXRDY!=1){} ScicRegs.SCITXBUF = a; } int Scic_recv(void) { while(SciaRegs.SCIRXST.bit.RXRDY!=1){} // wait for XRDY =1 for empty state return SciaRegs.SCIRXBUF.all; } __interrupt void scicTxFifoIsr(void) { Uint16 i; for(i=0; i< 8; i++) { ScicRegs.SCITXBUF=sdataB[i]; // Send data } ScicRegs.SCIFFTX.bit.TXFFINTCLR=1; // Clear Interrupt flag PieCtrlRegs.PIEACK.bit.ACK8=1; } __interrupt void scicRxFifoIsr(void) { Uint16 i; for(i=0;i<8;i++) { rdataB[i]=ScicRegs.SCIRXBUF.all; // Read data } ScicRegs.SCIFFRX.bit.RXFFOVRCLR=1; // Clear Overflow flag ScicRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag PieCtrlRegs.PIEACK.bit.ACK8=1; } //=========================================================================== // No more. //===========================================================================

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