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详细说明：这是一个TI DSP2812的GPIO的应用: 跑马灯程序,可以让8个Led灯,每隔一秒钟依序轮流闪烁,附录了完整的程序批注
//###########################################################################
//
// FILE: Example_281xGpio_Led.c Edited by Steven-Tsao
//
// TITLE: DSP281x GPIO LED Test
//
//
// This program requires the DSP281x V1.00 header files.
// As supplied, this project is configured for "boot to H0" operation.
//
// To work properly this test requires hardware configuration described
// below.
//
//###########################################################################
//###########################################################################
#include "DSP281x_Device.h" // DSP281x Headerfile Include File
#include "DSP281x_Examples.h" // DSP281x Examples Include File
// Prototype statements for functions found within this file.
Uint16 j=0x0001;
short i ;
void Gpio_select(void);
void delay_loop(Uint16 loop_time);
void main(void)
{
// Step 1. Initialize System Control registers, PLL, WatchDog,
// peripheral Clocks to default state:
// This 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();
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP281x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
// Step 5. User specific code
Gpio_select();
// *******************************************//
// ************ *************//
GpioDataRegs.GPACLEAR.all=0xFFFF; // All GpioAx to OFF
GpioDataRegs.GPADAT.all=j; // First led light ON
delay_loop(1000); // Delay 1[s]
while(1) //
{
for(i=1;i<8;i++) // The second led to eighth one lights by turns
{
j=0x0001<<(8*i);
GpioDataRegs.GPADAT.all=j;
delay_loop(1000); // // Delay 1[s]
}
for(i=1;i<8;i++)
{
j=0x1000>>(8*i); // The seventh led to first one lights by turns
GpioDataRegs.GPADAT.all=j;
delay_loop(1000); // Delay 1[s]
}
}
}
void Gpio_select(void)
{
EALLOW;
GpioMuxRegs.GPAMUX.all = 0x0000; // Configure MUXs as digital I/Os
GpioMuxRegs.GPADIR.all = 0xFFFF; // GPIO PORTs as output
GpioMuxRegs.GPAQUAL.all = 0x0000; // Set GPIO input qualifier values
EDIS;
}
// ********************************************** //
// Delay time function : set i[ms] with delay time function
// ********************************************** //
void delay_loop(Uint16 loop_time)
{
short i;
for (i = 0; i < loop_time; i++) {asm(" RPT #100000 ||NOP ");}
}
//===========================================================================
// No more.
//===========================================================================
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