// 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
InitScicGpio();
// 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;
InitPieVectTable();
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.XINT2 = &xint2_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
// Step 4. Initialize the Device Peripheral. This function can be
// found in DSP2833x_CpuTimers.c
InitCpuTimers(); // For this example, only initialize the Cpu Timers
InitSystimer(&CpuTimer1); //初始化CPUTimer1
// 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.
StartCpuTimer1();
// Step 5. User specific code, enable interrupts:
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER1.bit.INTx5 = 1; // Enable PIE Gropu 1 INT2
IER |= M_INT1;
// Enable global Interrupts and higher priority real-time debug events:
EINT; // Enable Global interrupt INTM
// ERTM; // Enable Global realtime interrupt DBGM
scic_fifo_init(); // Initialize the SCI FIFO
scic_echoback_init(); // Initalize SCI for echoback
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