使用control suite提供的28335例程v133 scia_loopback时,观察寄存器发现SCIA、SCIB、SCIC三个都在不断更新。运行一定时间后,程序暂停,弹出defaultlsr.c窗口。
这个例程理论上应该只有一个SCI在使用才对啊,而且这个暂停弹出窗口在其他SCI通信的程序中也会出现。
怎么解决?
怎么解释?
附上使用的control suite例程如下:
- //###########################################################################
- //
- // 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: 2833x/2823x Header Files and Peripheral Examples V133 $
- // $Release Date: June 8, 2012 $
- //###########################################################################
- #include "DSP28x_Project.h" // Device Headerfile and Examples Include File
- // Prototype statements for functions found within this file.
- void scia_loopback_init(void);
- void scia_fifo_init(void);
- void scia_xmit(int a);
- void error();
- 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;
- Uint16 ReceivedChar;
- // 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;
- scia_fifo_init(); // Initialize the SCI FIFO
- scia_loopback_init(); // Initalize SCI for digital loop back
- // 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(;;)
- {
- scia_xmit(SendChar);
- while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO
- // Check received character
- ReceivedChar = SciaRegs.SCIRXBUF.all;
- if(ReceivedChar != SendChar) error();
- // Move to the next character and repeat the test
- SendChar++;
- // Limit the character to 8-bits
- SendChar &= 0x00FF;
- 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,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
- void scia_loopback_init()
- {
- // Note: Clocks were turned on to the SCIA peripheral
- // in the InitSysCtrl() function
- 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.all =0x0003;
- SciaRegs.SCICTL2.bit.TXINTENA =1;
- SciaRegs.SCICTL2.bit.RXBKINTENA =1;
- SciaRegs.SCIHBAUD =0x0000;
- SciaRegs.SCILBAUD =0x000F;
- SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
- SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
- }
- // Transmit a character from the SCI'
- void scia_xmit(int a)
- {
- SciaRegs.SCITXBUF=a;
- }
- // Initalize the SCI FIFO
- void scia_fifo_init()
- {
- SciaRegs.SCIFFTX.all=0xE040;
- SciaRegs.SCIFFRX.all=0x204f;
- SciaRegs.SCIFFCT.all=0x0;
- }
- //===========================================================================
- // No more.
- //===========================================================================
复制代码
SCI是一个单工,半双工,和全双工都有的吧。然后,我一般都没有使用检验奇偶位
一周热门 更多>