Example_281xFlash.c
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- //###########################################################################
- //
- // FILE: DSP28_281xFlash.c
- //
- // TITLE: DSP281x Flash example.
- //
- // ASSUMPTIONS:
- //
- // This program requires the DSP281x V1.00 header files.
- // As supplied, this project is configured for "boot to Flash" operation.
- //
- // This example runs the EV Timer Period example from the
- // Flash.
- //
- // 1) Build the project
- // 2) Flash the .out file into the device. This program will fit on
- // an F2812 or an F2810
- // 3) Set the hardware jumpers to boot to Flash
- // 4) Use the included GEL file to load the project, symbols
- // defined within the project and the variables into the watch
- // window.
- //
- // Steps that were taken to convert the EV example from RAM
- // to Flash execution:
- //
- // - Change the linker cmd file to reflect the flash memory map.
- // This example uses the DSP281x F2812.cmd file.
- // - Make sure any initialized sections are mapped to Flash.
- // In SDFlash utility this can be checked by the View->Coff/Hex
- // status utility. Any section marked as "load" should be
- // allocated to Flash.
- // - Make sure there is a branch instruction from the entry to Flash
- // at 0x3F7FF6 to the beginning of code execution. This example
- // uses the DSP281x_CodeStartBranch.asm file to accomplish this.
- // - Set boot mode Jumpers to "boot to Flash"
- // - For best performance from the flash, modify the waitstates
- // and enable the flash pipeline as shown in this example.
- // Note: any code that manipulates the flash waitstate and pipeline
- // control must be run from RAM. Thus these functions are located
- // in their own memory section called ramfuncs.
- //
- // 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.
- //
- // ISR Locations:
- // eva_timer1_isr executed from RAM, puts flash in sleep mode
- // eva_timer2_isr executed from RAM, puts flash in standby mode
- // evb_timer3_isr executed from RAM, puts flash in sleep mode
- // and later moves it to standby
- // evb_timer4_isr executed from FLASH
- //
- // Watch Variables:
- //
- // EvaTimer1InterruptCount;
- // EvaTimer2InterruptCount;
- // EvbTimer3InterruptCount;
- // EvbTimer4InterruptCount;
- //
- //###########################################################################
- //
- // Ver | dd mmm yyyy | Who | Description of changes
- // =====|=============|======|===============================================
- // 1.00| 11 Sep 2003 | L.H. | Changes since previous version (v.58 Alpha)
- // | | | Updated comments with info on converting
- // | | | a project to flash.
- // | | | Changed the method for copying code from
- // | | | XINTF to internal RAM via the MemCopy
- // | | | function and symbols created by the
- // | | | linker.
- //###########################################################################
- #include "DSP281x_Device.h" // DSP281x Headerfile Include File
- #include "DSP281x_Examples.h" // DSP281x Examples Include File
- // Functions that will be run from RAM need to be assigned to
- // a different section. This section will then be mapped using
- // the linker cmd file.
- #pragma CODE_SECTION(eva_timer1_isr, "ramfuncs");
- #pragma CODE_SECTION(eva_timer2_isr, "ramfuncs");
- #pragma CODE_SECTION(evb_timer3_isr, "ramfuncs");
- // 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 variables used in this example
- Uint32 EvaTimer1InterruptCount;
- Uint32 EvaTimer2InterruptCount;
- Uint32 EvbTimer3InterruptCount;
- Uint32 EvbTimer4InterruptCount;
- Uint32 LoopCount;
- // These are defined by the linker (see F2812.cmd)
- extern Uint16 RamfuncsLoadStart;
- extern Uint16 RamfuncsLoadEnd;
- extern Uint16 RamfuncsRunStart;
- 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:
- // Copy time critical code and Flash setup code to RAM
- // This includes the following ISR functions: EvaTimer1(), EvaTimer2()
- // EvbTimer3 and and InitFlash();
- // The RamfuncsLoadStart, RamfuncsLoadEnd, and RamfuncsRunStart
- // symbols are created by the linker. Refer to the F2812.cmd file.
- MemCopy(&RamfuncsLoadStart, &RamfuncsLoadEnd, &RamfuncsRunStart);
- // Call Flash Initialization to setup flash waitstates
- // This function must reside in RAM
- InitFlash();
- // Initialize count values to 0
- EvaTimer1InterruptCount = 0;
- EvaTimer2InterruptCount = 0;
- EvbTimer3InterruptCount = 0;
- EvbTimer4InterruptCount = 0;
- LoopCount = 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:
- while(1)
- {
- LoopCount++;
- }
- }
-
- 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;
- }
-
- // This ISR MUST be executed from RAM as it will put the Flash into Sleep
- interrupt void eva_timer1_isr(void)
- {
- Uint16 i;
- // Put the Flash to sleep
- FlashRegs.FPWR.bit.PWR = FLASH_SLEEP;
-
- EvaTimer1InterruptCount++;
- // Short Delay to simulate some ISR Code
- for(i = 1; i < 0x03FF; i++) {}
- // 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;
- }
- // This ISR MUST be executed from RAM as it will put the Flash into Standby
- interrupt void eva_timer2_isr(void)
- {
- Uint16 i;
- // Put the Flash into standby
- FlashRegs.FPWR.bit.PWR = FLASH_STANDBY;
- EvaTimer2InterruptCount++;
- // Short Delay to simulate some ISR Code
- for(i = 1; i < 0x02FF; i++) {}
- // 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 recieve more interrupts from PIE group 3
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
- }
- // This ISR MUST be executed from RAM as it will put the Flash to sleep
- // and then later move it to Standby
- interrupt void evb_timer3_isr(void)
- {
- Uint16 i;
- // Put the Flash to sleep
- FlashRegs.FPWR.bit.PWR = FLASH_SLEEP;
- EvbTimer3InterruptCount++;
- // Short Delay to simulate some ISR Code
- for(i = 1; i < 0x01FF; i++) {}
- // Sometime later, move the Flash to standby
- FlashRegs.FPWR.bit.PWR = FLASH_STANDBY;
- // 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;
- }
- // This ISR will be executed out of Flash
- interrupt void evb_timer4_isr(void)
- {
- Uint16 i;
-
- EvbTimer4InterruptCount++;
- // Short Delay to simulate some ISR Code
- for(i = 1; i < 0x00FF; i++) {}
-
- // 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 recieve more interrupts from PIE group 5
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP5;
- }
- //===========================================================================
- // No more.
- //===========================================================================