操作GPIO点灯核心板LD1、LD2可以使用（当然在此之前要step 1：PLL, WatchDog, enable Peripheral Clocks；step 2：Clear all interrupts and initialize PIE vector table； step3：然后就是GPIO配置） 1、GPBDAT  数据寄存器 
配置GPIO复用（对应寄存器GPAMUX2）为GPIO功能 配置GPIO为输出（GPBDIR）默认为输入，0为输入，1为输出 函数中配置GPBDAT为1高电平，延时，在为0低电平，延时（如果配置GPIO为输入模式，GPBDAT为1时锁存，而不输出）
2、GPBSET/GPBCLEAR 设置 / 清除寄存器 这两个寄存器设置为0不起错用，设置为1时起作用，GPBSET为1，驱动输出高电平，GPBCLEAR为1，,驱动清低电平 3、GPATOGGLE  反转寄存器 为0时不起作用，为1时反转当前状态 #include "DSP28x_Project.h" // Device Headerfile and Examples Include File // Select the example to compile in. Only one example should be set as 1 // the rest should be set as 0. #define EXAMPLE1 0 // Use DATA registers to toggle I/O's #define EXAMPLE2 0 // Use SET/CLEAR registers to toggle I/O's #define EXAMPLE3 1 // Use TOGGLE registers to toggle I/O's // Prototype statements for functions found within this file. void delay_loop(void); void Gpio_select(void); void Gpio_example1(void); void Gpio_example2(void); void Gpio_example3(void); 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 // For this example use the following configuration: Gpio_select(); // 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 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(); // Step 4. Initialize all the Device Peripherals: // This function is found in DSP2833x_InitPeripherals.c // InitPeripherals(); // Not required for this example // Step 5. User specific code: #if EXAMPLE1 // This example uses DATA registers to toggle I/O's Gpio_example1(); #endif // - EXAMPLE1 #if EXAMPLE2 // This example uses SET/CLEAR registers to toggle I/O's Gpio_example2(); #endif #if EXAMPLE3 // This example uses TOGGLE registers to toggle I/O's Gpio_example3(); #endif } void delay_loop() { volatile long i; for (i = 0; i < 1000000; i++) {} } void Gpio_example1(void) { // Example 1: // Toggle I/Os using DATA registers // GPIO7 is used for buzzer for(;;) { //LD3 -> GPIO32 //LD1/2 ->GPIO60/61 // GpioDataRegs.GPADAT.all =0xAAAAAAAA; // 1010 A GpioDataRegs.GPBDAT.all =0x3000000A; // 32-63 delay_loop(); // GpioDataRegs.GPADAT.all =0x55555555; // 0101 5 GpioDataRegs.GPBDAT.all =0x00000005; delay_loop(); } } void Gpio_example2(void) { // Example 2: // Toggle I/Os using SET/CLEAR registers for(;;) { GpioDataRegs.GPASET.all =0xAAAAAAAA; GpioDataRegs.GPACLEAR.all =0x55555555; // set/clear register 1 is work GpioDataRegs.GPBSET.all =0x3000000A; GpioDataRegs.GPBCLEAR.all =0x00000005; delay_loop(); GpioDataRegs.GPACLEAR.all =0xAAAAAAAA; GpioDataRegs.GPASET.all =0x55555555; GpioDataRegs.GPBCLEAR.all =0x3000000A; GpioDataRegs.GPBSET.all =0x00000005; delay_loop(); } } void Gpio_example3(void) { // Example 2: // Toggle I/Os using TOGGLE registers // Set pins to a known state GpioDataRegs.GPASET.all =0xAAAAAAAA; GpioDataRegs.GPACLEAR.all =0x55555555; GpioDataRegs.GPBSET.all =0x3000000A; GpioDataRegs.GPBCLEAR.all =0x00000005; // Use TOGGLE registers to flip the state of // the pins. // Any bit set to a 1 will flip state (toggle) // Any bit set to a 0 will not toggle. for(;;) { GpioDataRegs.GPATOGGLE.all =0xFFFFFFFF; GpioDataRegs.GPBTOGGLE.all =0x3000000F; delay_loop(); } } void Gpio_select(void) { EALLOW; GpioCtrlRegs.GPAMUX1.all = 0x00000000; // All GPIO GpioCtrlRegs.GPAMUX2.all = 0x00000000; // All GPIO //GpioCtrlRegs.GPAMUX1.all = 0x00000000; // All GPIO GpioCtrlRegs.GPADIR.all = 0xFFFFFFFF; // All outputs GpioCtrlRegs.GPBDIR.all = 0x3000000F; // All outputs EDIS; }