162 lines
6.1 KiB
C
162 lines
6.1 KiB
C
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// TI File $Revision: /main/2 $
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// Checkin $Date: April 21, 2008 15:44:40 $
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//###########################################################################
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//
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// FILE: Example_2833xLedBlink.c
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//
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// TITLE: DSP2833x eZdsp LED Blink Getting Started Program.
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//
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// ASSUMPTIONS:
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//
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// This program requires the DSP2833x header files.
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//
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//
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// As supplied, this project is configured for "boot to SARAM"
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// operation. The 2833x Boot Mode table is shown below.
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// For information on configuring the boot mode of an eZdsp,
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// please refer to the documentation included with the eZdsp,
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//
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// $Boot_Table:
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//
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// GPIO87 GPIO86 GPIO85 GPIO84
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// XA15 XA14 XA13 XA12
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// PU PU PU PU
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// ==========================================
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// 1 1 1 1 Jump to Flash
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// 1 1 1 0 SCI-A boot
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// 1 1 0 1 SPI-A boot
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// 1 1 0 0 I2C-A boot
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// 1 0 1 1 eCAN-A boot
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// 1 0 1 0 McBSP-A boot
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// 1 0 0 1 Jump to XINTF x16
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// 1 0 0 0 Jump to XINTF x32
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// 0 1 1 1 Jump to OTP
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// 0 1 1 0 Parallel GPIO I/O boot
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// 0 1 0 1 Parallel XINTF boot
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// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
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// 0 0 1 1 Branch to check boot mode
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// 0 0 1 0 Boot to flash, bypass ADC cal
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// 0 0 0 1 Boot to SARAM, bypass ADC cal
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// 0 0 0 0 Boot to SCI-A, bypass ADC cal
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// Boot_Table_End$
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//
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// DESCRIPTION:
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//
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// This example configures CPU Timer0 for a 500 msec period, and toggles the GPIO32
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// LED on the 2833x eZdsp once per interrupt. For testing purposes, this example
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// also increments a counter each time the timer asserts an interrupt.
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//
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// Watch Variables:
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// CpuTimer0.InterruptCount
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//
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// Monitor the GPIO32 LED blink on (for 500 msec) and off (for 500 msec) on the 2833x eZdsp.
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//
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//###########################################################################
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// $TI Release: DSP2833x/DSP2823x Header Files V1.20 $
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// $Release Date: August 1, 2008 $
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//###########################################################################
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#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
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// Prototype statements for functions found within this file.
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interrupt void cpu_timer0_isr(void);
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void main(void)
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{
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// Step 1. Initialize System Control:
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// PLL, WatchDog, enable Peripheral Clocks
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// This example function is found in the DSP2833x_SysCtrl.c file.
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InitSysCtrl();
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// Step 2. Initalize GPIO:
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// This example function is found in the DSP2833x_Gpio.c file and
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// illustrates how to set the GPIO to it's default state.
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// InitGpio(); // Skipped for this example
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// Step 3. Clear all interrupts and initialize PIE vector table:
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// Disable CPU interrupts
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DINT;
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// Initialize the PIE control registers to their default state.
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// The default state is all PIE interrupts disabled and flags
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// are cleared.
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// This function is found in the DSP2833x_PieCtrl.c file.
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InitPieCtrl();
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// Disable CPU interrupts and clear all CPU interrupt flags:
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IER = 0x0000;
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IFR = 0x0000;
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// Initialize the PIE vector table with pointers to the shell Interrupt
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// Service Routines (ISR).
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// This will populate the entire table, even if the interrupt
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// is not used in this example. This is useful for debug purposes.
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// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
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// This function is found in DSP2833x_PieVect.c.
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InitPieVectTable();
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// Interrupts that are used in this example are re-mapped to
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// ISR functions found within this file.
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EALLOW; // This is needed to write to EALLOW protected registers
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PieVectTable.TINT0 = &cpu_timer0_isr;
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EDIS; // This is needed to disable write to EALLOW protected registers
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// Step 4. Initialize the Device Peripheral. This function can be
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// found in DSP2833x_CpuTimers.c
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InitCpuTimers(); // For this example, only initialize the Cpu Timers
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#if (CPU_FRQ_150MHZ)
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// Configure CPU-Timer 0 to interrupt every 500 milliseconds:
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// 150MHz CPU Freq, 50 millisecond Period (in uSeconds)
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ConfigCpuTimer(&CpuTimer0, 150, 500000);
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#endif
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#if (CPU_FRQ_100MHZ)
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// Configure CPU-Timer 0 to interrupt every 500 milliseconds:
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// 100MHz CPU Freq, 50 millisecond Period (in uSeconds)
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ConfigCpuTimer(&CpuTimer0, 100, 500000);
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#endif
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// To ensure precise timing, use write-only instructions to write to the entire register. Therefore, if any
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// of the configuration bits are changed in ConfigCpuTimer and InitCpuTimers (in DSP2833x_CpuTimers.h), the
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// below settings must also be updated.
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CpuTimer0Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0
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// Step 5. User specific code, enable interrupts:
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// Configure GPIO32 as a GPIO output pin
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EALLOW;
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GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 0;
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GpioCtrlRegs.GPBDIR.bit.GPIO32 = 1;
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EDIS;
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// Enable CPU INT1 which is connected to CPU-Timer 0:
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IER |= M_INT1;
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// Enable TINT0 in the PIE: Group 1 interrupt 7
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PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
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// Enable global Interrupts and higher priority real-time debug events:
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EINT; // Enable Global interrupt INTM
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ERTM; // Enable Global realtime interrupt DBGM
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// Step 6. IDLE loop. Just sit and loop forever (optional):
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for(;;);
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}
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interrupt void cpu_timer0_isr(void)
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{
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CpuTimer0.InterruptCount++;
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GpioDataRegs.GPBTOGGLE.bit.GPIO32 = 1; // Toggle GPIO32 once per 500 milliseconds
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// Acknowledge this interrupt to receive more interrupts from group 1
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PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
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}
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//===========================================================================
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// No more.
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//===========================================================================
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