gpio_example.c

TI DM648 gpio配置源代码,可以下接下到板子上,非常不错

/*  ============================================================================
 *   Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005, 2006, 2007
 *
 *   Use of this software is controlled by the terms and conditions found
 *   in the license agreement under which this software has been supplied.
 *  ============================================================================
 */

/** ============================================================================
 *
 *   @file  Gpio_example.c
 *
 *	 @path (CSL_EXAMPLE_PATH)\example\dm648\gpio\src
 *
 *   @desc  example for GPIO Register layer usage.
 *
 * =============================================================================
 *   @n Target Platform: EVM
 *  ============================================================================
 *   @n <b> Example Description </b>
 *   @verbatim
      This Example, 
       1. Write 1 (high) to GPIO pin 8 and then read it back to verify
       2. Write 0 (low) to GPIO pin 8 and then read it back to verify 
 *
 * =============================================================================
 *      
 *   <b> Procedure to run the example </b>
 *   @verbatim
 *      1. Configure the CCS setup to work with the emulator being used
 *      2. Please refer CCS manual for setup configuration and loading 
 *         proper GEL file
 *      3. Launch CCS window
 *      4. Open project GPIO_example.pjt
 *      5. Build the project and load the .out file of the project.
 *          
 *   @endverbatim
 *
 */

/* =============================================================================
 *  Revision History
 *  ===============
 *
 *  22-March-2007 File Created.
 *
 * =============================================================================
 */


#include <tistdtypes.h>
#include <soc.h>
#include <cslr_sys.h>
#include <cslr_psc.h>
#include <cslr_gpio.h>
#include <stdio.h>


/*
 * =============================================================================
 *   @func   sw_wait
 *
 *   @desc
 *     This is the delay routine.
 *
 * =============================================================================
 */
void sw_wait (int delay) 
{
    volatile int i;
    for( i = 0; i < delay; i++ ) {
    }
}
    
/*
 * =============================================================================
 *   @func   test_GPIO
 *
 *   @desc
 *     This is the example code for GPIO register layer macro usage.
 *
 * =============================================================================
 */
void test_GPIO (void) 
{
    /* Pointer to register overlay structure for PSC */
    CSL_PscRegsOvly pscRegs = (CSL_PscRegsOvly)CSL_PSC_0_REGS;
        /* Pointer to register overlay structure for GPIO */
    CSL_GpioRegsOvly gpioRegs = (CSL_GpioRegsOvly)CSL_GPIO_0_REGS;

    
    /* enable GPIO LPSC*/
    pscRegs->MDCTL[CSL_PSC_GPIO] = CSL_FMKT(PSC_MDCTL_NEXT, ENABLE) | 
                                   CSL_FMKT(PSC_MDCTL_LRST, DEASSERT);
    
    pscRegs->PTCMD = CSL_FMKT(PSC_PTCMD_GO0, SET);
    
    while (CSL_FEXT(pscRegs->MDSTAT[CSL_PSC_GPIO], PSC_MDSTAT_STATE)
          != CSL_PSC_MDSTAT_STATE_ENABLE);
    
    /* Configure pin 8 as an output, then set the data High (Low->High).*/
    CSL_FINS(gpioRegs->DIR01, GPIO_DIR01_DIR8, CSL_GPIO_DIR01_DIR8_OUT);
        
    /* Set Data high in SET_DATA register*/
    gpioRegs->SET_DATA01 = 
      CSL_FMK(GPIO_SET_DATA01_SET8, CSL_GPIO_SET_DATA01_SET8_SET);    
    
    sw_wait(10);
    
    /* read IN_DATA*/
    if (CSL_FEXT(gpioRegs->IN_DATA01, GPIO_IN_DATA01_IN8)
       != CSL_GPIO_IN_DATA01_IN8_HIGH) {
        printf("Driving GPIO8 high failed!\n" );
        return;
    }
    
    sw_wait(10);
    
    /* Set Data low in CLR_DATA register*/
    gpioRegs->CLR_DATA01 = 
      CSL_FMK(GPIO_CLR_DATA01_CLR8, CSL_GPIO_CLR_DATA01_CLR8_CLEAR);    
    
    sw_wait(10);
    
    /* read IN_DATA*/
    if (CSL_FEXT( gpioRegs->IN_DATA01, GPIO_IN_DATA01_IN8) != 
    	CSL_GPIO_IN_DATA01_IN8_LOW) {
        printf("Driving GPIO8 low failed!\n" );
        return;
    }
    
    printf( "Test of GPIO8 is successful!\n" );
}
    
/*
 * =============================================================================
 *   @func   main
 *
 *   @desc
 *     This is the main routine for the file.
 *
 * =============================================================================
 */
void main (void) 
{
    test_GPIO( );
    return;
}