dsp DM642用定时器点亮LED 源程序

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dsp DM642用定时器点亮LED 源程序 [复制链接]

// FILE:    Example_2833xLedBlink.c

//

// TITLE:   DSP2833x eZdsp LED Blink Getting Started Program.

//

// ASSUMPTIONS:

//

//    This program requires the DSP2833x header files.

//

//

//    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 example configures CPU Timer0 for a 500 msec period, and toggles the GPIO32

//    LED on the 2833x eZdsp once per interrupt. For testing purposes, this example

//    also increments a counter each time the timer asserts an interrupt.

//

//       Watch Variables:

//          CpuTimer0.InterruptCount

//

//       Monitor the GPIO32 LED blink on (for 500 msec) and off (for 500 msec) on the 2833x eZdsp.

//

//###########################################################################

// $TI Release: DSP2833x Header Files V1.10 $

// $Release Date: February 15, 2008 $

//###########################################################################

#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File

#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File

// Prototype statements for functions found within this file.

interrupt void cpu_timer0_isr(void);

unsigned int Count,Flag;

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;

   Count = 0;                                        //初始化变量

   Flag=0;

   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 to interrupt every 500 milliseconds:

// 150MHz CPU Freq, 50 millisecond Period (in uSeconds)

   ConfigCpuTimer(&CpuTimer0, 150, 500000);

#endif

#if (CPU_FRQ_100MHZ)

// Configure CPU-Timer 0 to interrupt every 500 milliseconds:

// 100MHz CPU Freq, 50 millisecond Period (in uSeconds)

   ConfigCpuTimer(&CpuTimer0, 100, 500000);

#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

// Step 5. User specific code, enable interrupts:

// Configure GPIO0-3 as a GPIO output pin

   EALLOW;

   GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0;

   GpioCtrlRegs.GPADIR.bit.GPIO0 = 1;

   GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 0;

   GpioCtrlRegs.GPADIR.bit.GPIO1 = 1;

   GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 0;

   GpioCtrlRegs.GPADIR.bit.GPIO2 = 1;

   GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 0;

   GpioCtrlRegs.GPADIR.bit.GPIO3 = 1;

   EDIS;

// Enable CPU INT1 which is connected to CPU-Timer 0:

   IER |= M_INT1;

// 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++;

   GpioDataRegs.GPATOGGLE.bit.GPIO0 = 1; // Toggle GPIO0 once per 500 milliseconds

   GpioDataRegs.GPATOGGLE.bit.GPIO1 = 1; // Toggle GPIO1 once per 500 milliseconds

   GpioDataRegs.GPATOGGLE.bit.GPIO2 = 1; // Toggle GPIO2 once per 500 milliseconds

   GpioDataRegs.GPATOGGLE.bit.GPIO3 = 1; // Toggle GPIO3 once per 500 milliseconds

   // Acknowledge this interrupt to receive more interrupts from group 1

   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

}