www.pudn.com > tidcs.rar > Example_2823xCpuTimer.c, change:2009-08-04,size:7027b


// TI File $Revision: /main/3 $ 
// Checkin $Date: April 21, 2008   16:00:39 $ 
//########################################################################### 
// 
// FILE:    Example_2823xCpuTimer.c 
// 
// TITLE:   DSP2823x Device Getting Started Program. 
// 
// ASSUMPTIONS: 
// 
//    This program requires the DSP2823x header files. 
// 
//    Other then boot mode configuration, no other hardware configuration 
//    is required. 
// 
// 
//    As supplied, this project is configured for "boot to SARAM" 
//    operation.  The 2823x 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 example configures CPU Timer0, 1, and 2 and increments 
//    a counter each time the timers assert an interrupt. 
// 
//       Watch Variables: 
//          CpuTimer0.InterruptCount 
//          CpuTimer1.InterruptCount 
//          CpuTimer2.InterruptCount 
// 
//########################################################################### 
// $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $ 
// $Release Date: August 4, 2009 $ 
//########################################################################### 
 
 
#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File 
 
// Prototype statements for functions found within this file. 
interrupt void cpu_timer0_isr(void); 
interrupt void cpu_timer1_isr(void); 
interrupt void cpu_timer2_isr(void); 
 
void main(void) 
{ 
 
// Step 1. Initialize System Control: 
// PLL, WatchDog, enable Peripheral Clocks 
// This example function is found in the DSP2833x_SysCtrl.c file. 
   InitSysCtrl(); 
 
// Step 2. Initalize GPIO: 
// This example function is found in the DSP2833x_Gpio.c file and 
// illustrates how to set the GPIO to it's default state. 
// InitGpio();  // Skipped for this example 
 
 
// Step 3. Clear all interrupts and initialize PIE vector table: 
// Disable CPU interrupts 
   DINT; 
 
// Initialize the 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 DSP2833x_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 DSP2833x_DefaultIsr.c. 
// This function is found in DSP2833x_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.TINT0 = &cpu_timer0_isr; 
   PieVectTable.XINT13 = &cpu_timer1_isr; 
   PieVectTable.TINT2 = &cpu_timer2_isr; 
   EDIS;    // This is needed to disable write to EALLOW protected registers 
 
// Step 4. Initialize the Device Peripheral. This function can be 
//         found in DSP2833x_CpuTimers.c 
   InitCpuTimers();   // For this example, only initialize the Cpu Timers 
 
#if (CPU_FRQ_150MHZ) 
// Configure CPU-Timer 0, 1, and 2 to interrupt every second: 
// 150MHz CPU Freq, 1 second Period (in uSeconds) 
 
   ConfigCpuTimer(&CpuTimer0, 150, 1000000); 
   ConfigCpuTimer(&CpuTimer1, 150, 1000000); 
   ConfigCpuTimer(&CpuTimer2, 150, 1000000); 
#endif 
 
#if (CPU_FRQ_100MHZ) 
// Configure CPU-Timer 0, 1, and 2 to interrupt every second: 
// 100MHz CPU Freq, 1 second Period (in uSeconds) 
 
   ConfigCpuTimer(&CpuTimer0, 100, 1000000); 
   ConfigCpuTimer(&CpuTimer1, 100, 1000000); 
   ConfigCpuTimer(&CpuTimer2, 100, 1000000); 
#endif 
// To ensure precise timing, use write-only instructions to write to the entire register. Therefore, if any 
// of the configuration bits are changed in ConfigCpuTimer and InitCpuTimers (in DSP2833x_CpuTimers.h), the 
// below settings must also be updated. 
 
   CpuTimer0Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0 
   CpuTimer1Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0 
   CpuTimer2Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0 
 
// Step 5. User specific code, enable interrupts: 
 
 
// Enable CPU int1 which is connected to CPU-Timer 0, CPU int13 
// which is connected to CPU-Timer 1, and CPU int 14, which is connected 
// to CPU-Timer 2: 
   IER |= M_INT1; 
   IER |= M_INT13; 
   IER |= M_INT14; 
 
// Enable TINT0 in the PIE: Group 1 interrupt 7 
   PieCtrlRegs.PIEIER1.bit.INTx7 = 1; 
 
// Enable global Interrupts and higher priority real-time debug events: 
   EINT;   // Enable Global interrupt INTM 
   ERTM;   // Enable Global realtime interrupt DBGM 
 
// Step 6. IDLE loop. Just sit and loop forever (optional): 
   for(;;); 
 
} 
 
 
interrupt void cpu_timer0_isr(void) 
{ 
   CpuTimer0.InterruptCount++; 
 
   // Acknowledge this interrupt to receive more interrupts from group 1 
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; 
} 
 
interrupt void cpu_timer1_isr(void) 
{ 
   CpuTimer1.InterruptCount++; 
   // The CPU acknowledges the interrupt. 
   EDIS; 
} 
 
interrupt void cpu_timer2_isr(void) 
{  EALLOW; 
   CpuTimer2.InterruptCount++; 
   // The CPU acknowledges the interrupt. 
   EDIS; 
} 
 
//=========================================================================== 
// No more. 
//===========================================================================