Example_281xEvTimerPeriod.c
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上传日期:2014-10-27
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文件大小:10k
源码类别:
DSP编程
开发平台:
C/C++
- //###########################################################################
- //
- // FILE: Example_281xEvTimerPeriod.c
- //
- // TITLE: DSP281x Event Manager GP Timer example program.
- //
- // 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 sets up EVA Timer 1, EVA Timer 2, EVB Timer 3
- // and EVB Timer 4 to fire an interrupt on a period overflow.
- // A count is kept each time each interrupt passes through
- // the interrupt service routine.
- //
- // EVA Timer 1 has the shortest period while EVB Timer4 has the
- // longest period.
- //
- // Watch Variables:
- //
- // EvaTimer1InterruptCount;
- // EvaTimer2InterruptCount;
- // EvbTimer3InterruptCount;
- // EvbTimer4InterruptCount;
- //
- //###########################################################################
- //
- // Ver | dd mmm yyyy | Who | Description of changes
- // =====|=============|======|===============================================
- // 1.00| 11 Sep 2003 | L.H. | No change since previous version (v.58 Alpha)
- //###########################################################################
- #include "DSP281x_Device.h" // DSP281x Headerfile Include File
- #include "DSP281x_Examples.h" // DSP281x Examples Include File
- // Prototype statements for functions found within this file.
- interrupt void eva_timer1_isr(void);
- interrupt void eva_timer2_isr(void);
- interrupt void evb_timer3_isr(void);
- interrupt void evb_timer4_isr(void);
- void init_eva_timer1(void);
- void init_eva_timer2(void);
- void init_evb_timer3(void);
- void init_evb_timer4(void);
- // Global counts used in this example
- Uint32 EvaTimer1InterruptCount;
- Uint32 EvaTimer2InterruptCount;
- Uint32 EvbTimer3InterruptCount;
- Uint32 EvbTimer4InterruptCount;
- void main(void)
- {
- // 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(); // Skipped for this example
- // 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.T1PINT = &eva_timer1_isr;
- PieVectTable.T2PINT = &eva_timer2_isr;
- PieVectTable.T3PINT = &evb_timer3_isr;
- PieVectTable.T4PINT = &evb_timer4_isr;
- 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
- init_eva_timer1();
- init_eva_timer2();
- init_evb_timer3();
- init_evb_timer4();
- // Step 5. User specific code, enable interrupts:
- // Initialize count values to 0
- EvaTimer1InterruptCount = 0;
- EvaTimer2InterruptCount = 0;
- EvbTimer3InterruptCount = 0;
- EvbTimer4InterruptCount = 0;
- // Enable PIE group 2 interrupt 4 for T1PINT
- PieCtrlRegs.PIEIER2.all = M_INT4;
- // Enable PIE group 3 interrupt 1 for T2PINT
- PieCtrlRegs.PIEIER3.all = M_INT1;
- // Enable PIE group 4 interrupt 4 for T3PINT
- PieCtrlRegs.PIEIER4.all = M_INT4;
- // Enable PIE group 5 interrupt 1 for T4PINT
- PieCtrlRegs.PIEIER5.all = M_INT1;
- // Enable CPU INT2 for T1PINT, INT3 for T2PINT, INT4 for T3PINT
- // and INT5 for T4PINT:
- IER |= (M_INT2 | M_INT3 | M_INT4 | M_INT5);
- // 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:
- for(;;);
- }
- void init_eva_timer1(void)
- {
- // Initialize EVA Timer 1:
- // Setup Timer 1 Registers (EV A)
- EvaRegs.GPTCONA.all = 0;
- // Set the Period for the GP timer 1 to 0x0200;
- EvaRegs.T1PR = 0x0200; // Period
- EvaRegs.T1CMPR = 0x0000; // Compare Reg
- // Enable Period interrupt bits for GP timer 1
- // Count up, x128, internal clk, enable compare, use own period
- EvaRegs.EVAIMRA.bit.T1PINT = 1;
- EvaRegs.EVAIFRA.bit.T1PINT = 1;
- // Clear the counter for GP timer 1
- EvaRegs.T1CNT = 0x0000;
- EvaRegs.T1CON.all = 0x1742;
- // Start EVA ADC Conversion on timer 1 Period interrupt
- EvaRegs.GPTCONA.bit.T1TOADC = 2;
- }
- void init_eva_timer2(void)
- {
- // Initialize EVA Timer 2:
- // Setup Timer 2 Registers (EV A)
- EvaRegs.GPTCONA.all = 0;
- // Set the Period for the GP timer 2 to 0x0200;
- EvaRegs.T2PR = 0x0400; // Period
- EvaRegs.T2CMPR = 0x0000; // Compare Reg
- // Enable Period interrupt bits for GP timer 2
- // Count up, x128, internal clk, enable compare, use own period
- EvaRegs.EVAIMRB.bit.T2PINT = 1;
- EvaRegs.EVAIFRB.bit.T2PINT = 1;
- // Clear the counter for GP timer 2
- EvaRegs.T2CNT = 0x0000;
- EvaRegs.T2CON.all = 0x1742;
- // Start EVA ADC Conversion on timer 2 Period interrupt
- EvaRegs.GPTCONA.bit.T2TOADC = 2;
- }
- void init_evb_timer3(void)
- {
- // Initialize EVB Timer 3:
- // Setup Timer 3 Registers (EV B)
- EvbRegs.GPTCONB.all = 0;
- // Set the Period for the GP timer 3 to 0x0200;
- EvbRegs.T3PR = 0x0800; // Period
- EvbRegs.T3CMPR = 0x0000; // Compare Reg
- // Enable Period interrupt bits for GP timer 3
- // Count up, x128, internal clk, enable compare, use own period
- EvbRegs.EVBIMRA.bit.T3PINT = 1;
- EvbRegs.EVBIFRA.bit.T3PINT = 1;
- // Clear the counter for GP timer 3
- EvbRegs.T3CNT = 0x0000;
- EvbRegs.T3CON.all = 0x1742;
- // Start EVA ADC Conversion on timer 3 Period interrupt
- EvbRegs.GPTCONB.bit.T3TOADC = 2;
- }
- void init_evb_timer4(void)
- {
- // Initialize EVB Timer 4:
- // Setup Timer 4 Registers (EV B)
- EvbRegs.GPTCONB.all = 0;
- // Set the Period for the GP timer 4 to 0x0200;
- EvbRegs.T4PR = 0x1000; // Period
- EvbRegs.T4CMPR = 0x0000; // Compare Reg
- // Enable Period interrupt bits for GP timer 4
- // Count up, x128, internal clk, enable compare, use own period
- EvbRegs.EVBIMRB.bit.T4PINT = 1;
- EvbRegs.EVBIFRB.bit.T4PINT = 1;
- // Clear the counter for GP timer 4
- EvbRegs.T4CNT = 0x0000;
- EvbRegs.T4CON.all = 0x1742;
- // Start EVA ADC Conversion on timer 4 Period interrupt
- EvbRegs.GPTCONB.bit.T4TOADC = 2;
- }
- interrupt void eva_timer1_isr(void)
- {
- EvaTimer1InterruptCount++;
- // Enable more interrupts from this timer
- EvaRegs.EVAIMRA.bit.T1PINT = 1;
- // Note: To be safe, use a mask value to write to the entire
- // EVAIFRA register. Writing to one bit will cause a read-modify-write
- // operation that may have the result of writing 1's to clear
- // bits other then those intended.
- EvaRegs.EVAIFRA.all = BIT7;
- // Acknowledge interrupt to receive more interrupts from PIE group 2
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP2;
- }
- interrupt void eva_timer2_isr(void)
- {
- EvaTimer2InterruptCount++;
- // Enable more interrupts from this timer
- EvaRegs.EVAIMRB.bit.T2PINT = 1;
- // Note: To be safe, use a mask value to write to the entire
- // EVAIFRB register. Writing to one bit will cause a read-modify-write
- // operation that may have the result of writing 1's to clear
- // bits other then those intended.
- EvaRegs.EVAIFRB.all = BIT0;
- // Acknowledge interrupt to receive more interrupts from PIE group 3
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
- }
- interrupt void evb_timer3_isr(void)
- {
- EvbTimer3InterruptCount++;
- // Note: To be safe, use a mask value to write to the entire
- // EVBIFRA register. Writing to one bit will cause a read-modify-write
- // operation that may have the result of writing 1's to clear
- // bits other then those intended.
- EvbRegs.EVBIFRA.all = BIT7;
- // Acknowledge interrupt to receive more interrupts from PIE group 4
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;
- }
- interrupt void evb_timer4_isr(void)
- {
- EvbTimer4InterruptCount++;
- // Note: To be safe, use a mask value to write to the entire
- // EVBIFRB register. Writing to one bit will cause a read-modify-write
- // operation that may have the result of writing 1's to clear
- // bits other then those intended.
- EvbRegs.EVBIFRB.all = BIT0;
- // Acknowledge interrupt to receive more interrupts from PIE group 5
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP5;
- }
- //===========================================================================
- // No more.
- //===========================================================================