Example_281xCodeRunFromXintf.c
上传用户:qingfan3
上传日期:2014-10-27
资源大小:31439k
文件大小:9k
源码类别:
DSP编程
开发平台:
C/C++
- //###########################################################################
- //
- // FILE: Example_281xCodeRunFromXintf.c
- //
- // TITLE: Example Program That Executes From XINTF (assumes MPNMC = 1)
- //
- // ASSUMPTIONS:
- //
- // This program requires the DSP281x V1.00 header files.
- // As supplied, this project is configured for "boot from XINTF Zone 7"
- // operation.
- //
- // XMP/MCn pin = 1
- //
- // Map the region for XINTF Zone 7 as RAM in Code Composer
- // (Refer to the F2812.gel file supplied with CCS Studio)
- //
- // DESCRIPTION:
- //
- // This example configures CPU Timer0 and increments
- // a counter each time the timer asserts an interrupt.
- //
- // Watch Variables:
- // CpuTimer0.InterruptCount
- // BackGroundCounter
- //###########################################################################
- //
- // Original Author: A.T.
- //
- // Ver | dd mmm yyyy | Who | Description of changes
- // =====|=============|======|===============================================
- // 1.00| 11 Sep 2003 | L.H. | Changes since previous version (v.58 Alpha)
- // | | | Changed the method for copying code from
- // | | | XINTF to internal RAM via the MemCopy
- // | | | function and symbols created by the
- // | | | linker.
- // | | | Added pipeline flush after the XINTF Init
- //###########################################################################
- // Step 0: Include required header files:
- // DSP281x_Device.h: device specific definitions #include statements for
- // all of the peripheral .h definition files.
- #include "DSP281x_Device.h" // DSP281x Headerfile Include File
- #include "DSP281x_Examples.h" // DSP281x Examples Include File
- // Prototype statements for functions found within this file:
- // Assign this function to a section to be linked to internal RAM
- #pragma CODE_SECTION(xintf_zone6and7_timing,"ramfuncs");
- void xintf_zone6and7_timing(void);
- interrupt void ISR_CPUTimer0(void);
- void error(void);
- // Global variables found within this file:
- Uint32 BackgroundCount = 0;
- // RAM Count - This counter will be stored in RAM, to compare with that stored
- // in XINTF.
- #pragma DATA_SECTION(RamInterruptCount,"ramdata");
- Uint32 RamInterruptCount = 0;
- void main(void)
- {
- //-----------------------------------------------------------------------
- // Step 1 to Step 5 should be followed in all designs:
- //
- // Step 1: Disable and clear all CPU interrupts:
- DINT;
- IER = 0x0000;
- IFR = 0x0000;
- // Step 2. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
- // This function is found in the DSP281x_SysCtrl.c file.
- InitSysCtrl();
- // Step 3. Select GPIO for the device or for the specific application:
- // This function is found in the DSP281x_Gpio.c file.
- // InitGpio(); // Not required for this example
- // Step 4. Initialize PIE to known state (control registers and vector table):
- // The PIE vector table is initialized with pointers to shell Interrupt
- // Service Routines (ISR). The shell routines are found in DSP281x_DefaultIsr.c.
- // Insert user specific ISR code in the appropriate shell ISR routine in
- // the DSP281x_DefaultIsr.c file.
- //
- // Initialize Pie Control Registers To Default State:
- // This function is found in the DSP281x_PieCtrl.c file.
- InitPieCtrl();
- // Initialize the PIE Vector Table To a Known State:
- // This function is found in DSP281x_PieVect.c.
- // This function populates the PIE vector table with pointers
- // to the shell ISR functions found in DSP281x_DefaultIsr.c.
- InitPieVectTable();
- // Enable CPU and PIE interrupts
- // This example function is found in the DSP281x_PieCtrl.c file.
- EnableInterrupts();
- // Step 5. Initialize all the Device Peripherals to a known state:
- // This function is found in DSP281x_InitPeripherals.c
- // InitPeripherals(); // For this example just init the CPU Timers
- InitCpuTimers();
- //-----------------------------------------------------------------------
- // User specific code:
- //
- // Initalize XINTF Zone 6 and Zone 7 timing
- // First copy the function to RAM, then call the function to
- // change the zone timing
- // The RamfuncsLoadStart, RamfuncsLoadEnd, and RamfuncsRunStart
- // symbols are created by the linker.
- // Refer to the CodeRunFromXintfonF2812EzDSP.cmd file.
- MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);
- xintf_zone6and7_timing();
- EALLOW; // This is needed to write to EALLOW protected registers
- PieVectTable.TINT0 = &ISR_CPUTimer0;
- EDIS; // This is needed to disable write to EALLOW protected registers
- PieCtrlRegs.PIEIER1.bit.INTx7 = 1; // Enable INT1.7 which is connected to CPU-Timer 0:
- IER |= M_INT1;
- SetDBGIER(M_INT1); // Enable INT1 for Real-Time mode
- EINT; // Enable Global interrupt INTM
- ERTM; // Enable Global realtime debug DBGM
- // Configure and Initialize CPU Timer 0 for:
- // > CPU Timer 0 Connect To INT1.7
- // > Set Up For 1 Second Interrupt Period
- // > Point To "ISR_CPUTimer0" function
- ConfigCpuTimer(&CpuTimer0, 150, 1000000); // 150MHz CPU Freq, 1 second Period (in uSeconds)
- StartCpuTimer0();
- for(;;)
- BackgroundCount++; // IDLE loop. Just sit and loop forever....
- exit(0); // should never get here.
- }
- interrupt void ISR_CPUTimer0(void)
- {
- PieCtrlRegs.PIEACK.all = 0xFFFF;
- ERTM; // Enable Global realtime debug DBGM
- CpuTimer0.InterruptCount++; // Should increment every second.
- RamInterruptCount++;
- if(RamInterruptCount != CpuTimer0.InterruptCount) error();
- }
- // Configure the timing paramaters for Zone 6 and Zone 7.
- // Note: this function should not be executed from the same
- // zones as those being configured.
- void xintf_zone6and7_timing()
- {
- // All Zones---------------------------------
- // Timing for all zones based on XTIMCLK = SYSCLKOUT
- XintfRegs.XINTCNF2.bit.XTIMCLK = 0;
- // Buffer up to 3 writes
- XintfRegs.XINTCNF2.bit.WRBUFF = 3;
- // XCLKOUT is enabled
- XintfRegs.XINTCNF2.bit.CLKOFF = 0;
- // XCLKOUT = XTIMCLK
- XintfRegs.XINTCNF2.bit.CLKMODE = 0;
- // Zone 6------------------------------------
- // When using ready, ACTIVE must be 1 or greater
- // Lead must always be 1 or greater
- // Zone write timing
- XintfRegs.XTIMING6.bit.XWRLEAD = 1;
- XintfRegs.XTIMING6.bit.XWRACTIVE = 1;
- XintfRegs.XTIMING6.bit.XWRTRAIL = 1;
- // Zone read timing
- XintfRegs.XTIMING6.bit.XRDLEAD = 1;
- XintfRegs.XTIMING6.bit.XRDACTIVE = 2;
- XintfRegs.XTIMING6.bit.XRDTRAIL = 0;
- // do not double all Zone read/write lead/active/trail timing
- XintfRegs.XTIMING6.bit.X2TIMING = 0;
- // Zone will not sample READY
- XintfRegs.XTIMING6.bit.USEREADY = 0;
- XintfRegs.XTIMING6.bit.READYMODE = 0;
- // Size must be 1,1 - other values are reserved
- XintfRegs.XTIMING6.bit.XSIZE = 3;
- // Zone 7------------------------------------
- // When using ready, ACTIVE must be 1 or greater
- // Lead must always be 1 or greater
- // Zone write timing
- XintfRegs.XTIMING7.bit.XWRLEAD = 1;
- XintfRegs.XTIMING7.bit.XWRACTIVE = 1;
- XintfRegs.XTIMING7.bit.XWRTRAIL = 1;
- // Zone read timing
- XintfRegs.XTIMING7.bit.XRDLEAD = 1;
- XintfRegs.XTIMING7.bit.XRDACTIVE = 2;
- XintfRegs.XTIMING7.bit.XRDTRAIL = 0;
- // don't double all Zone read/write lead/active/trail timing
- XintfRegs.XTIMING7.bit.X2TIMING = 0;
- // Zone will not sample XREADY signal
- XintfRegs.XTIMING7.bit.USEREADY = 0;
- XintfRegs.XTIMING7.bit.READYMODE = 0;
- // Size must be 1,1 - other values are reserved
- XintfRegs.XTIMING7.bit.XSIZE = 3;
- //Force a pipeline flush to ensure that the write to
- //the last register configured occurs before returning.
- asm(" RPT #7 || NOP");
- }
- void error(void)
- {
- asm(" ESTOP0"); // software breakpoint
- }
- //===========================================================================
- // No more.
- //===========================================================================