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楼主 |
发表于 2011-3-26 09:12:57
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在主程序中没有发送数据,只是在发送中断时发送数据;既然这样为什么不发送数据也能进入发送中断呢,请大侠解释!!!!
程序:
// TI File $Revision: /main/4 $
// Checkin $Date: July 2, 2007 11:28:28 $
//###########################################################################
//
// 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
//###########################################################################
// $TI Release: DSP281x C/C++ Header Files V1.20 $
// $Release Date: July 27, 2009 $
//###########################################################################
#include "DSP281x_Device.h" // DSP281x Headerfile Include File
#include "DSP281x_Examples.h" // DSP281x Examples Include File
#define CPU_FREQ 150E6
#define LSPCLK_FREQ CPU_FREQ/4
#define SCI_FREQ 9600//100E3 //波特率
#define SCI_PRD (LSPCLK_FREQ/(SCI_FREQ*8))-1
// Prototype statements for functions found within this file.
interrupt void sciaTxFifoIsr(void);
interrupt void sciaRxFifoIsr(void);
void scia_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;
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
// 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;
}
rdata_pointA = sdataA[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 Gro |
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