testtc.c

AT91RM9200的嵌入式LINUX下GPIO驱动

/* testtc.c
* test file for testing AT91RM9200 tc, deals with the Timer/Counter 1
*/
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sched.h>  
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <linux/termios.h>
#include <fcntl.h>
#include <asm/param.h>
#include <asm/arch/hardware.h>  /* get all the AT91 def's */
#include <asm/arch/tc.h>  /* get all the tc ioctl def's */

int main(int argc, char **argv)
  {
  unsigned int cntr;
  struct at91_tc_ioctl_clock tc_clock;
  struct at91_pck_ioctl pmc_pck;

  char *filename4 = "/dev/tc1";
  int file4;

#define AT91C_START_CNT -1  /* almost forever */
unsigned int rd_wr_sz = AT91C_START_CNT;

  printf ("tc test program\n");
  if (argc <= 1)
    {
    printf("testtc [period] [pin_on_off(1 or 0)] [dev (/dev/tca29]\n");
    printf("\t period: period of TIOA1\n");
    }
  if (argc > 1)  /* how many loops to take */
    rd_wr_sz = atoi (argv[1]);
  if ((file4 = open(filename4, O_RDWR)) < 0)
    {
    printf ("open failed %s\n", filename4);
    exit(1);
    }
#define AT91_DAS_FREQ 960
  tc_clock.tc_rc = AT91C_TC_TIMER_DIV1_CLK / AT91_DAS_FREQ;  /* set to 960 Hz */
  tc_clock.tc_ra = ((AT91C_TC_TIMER_DIV1_CLK / AT91_DAS_FREQ) * 31) / 32;  /* make 1/32 high pulse */
  tc_clock.tc_ccr = AT91C_TC_CLKEN | AT91C_TC_SWTRG;  /* Channel Control Register */
  tc_clock.tc_cmr = AT91C_TC_ACPA_SET | AT91C_TC_ACPC_CLEAR | AT91C_TC_WAVE | 
    AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_TIMER_DIV1_CLOCK;  /* Channel Mode Register */
  tc_clock.tcb_bcr = 0;  /* TC Block Control Register */
  tc_clock.tcb_bmr = 0;  /* TC Block Mode Register */
  tc_clock.p_pio = AT91C_BASE_PIOA;  /* PIO port if any */
  tc_clock.pio_asr = 0;  /* ASR for above port if any */
  tc_clock.pio_bsr = AT91C_PA19_TIOA1;  /* BSR for above port if any */
  if (ioctl(file4, AT91_TC_SET_CLOCK, &tc_clock) != 0)  /* write the data */
    {
    perror ("AT91_TC_SET_CLOCK failed");
    close (file4);
    exit (1);
    } 
  /* now program the 288 kHz pin to the power supply 18.432 MHz / 64 */
  pmc_pck.pck_no = 0;  /* Select PCK0 */
  pmc_pck.pmc_pck = AT91C_PMC_PRES_CLK_64 | AT91C_PMC_CSS_MAIN_CLK;  /* TC Block Mode Register */
  pmc_pck.p_pio = AT91C_BASE_PIOB;  /* PIO port if any */
  pmc_pck.pio_asr = AT91C_PB27_PCK0;  /* ASR for above port if any */
  pmc_pck.pio_bsr = 0;  /* BSR for above port if any */
  if (ioctl(file4, AT91_TC_ENABLE_PCK, &pmc_pck) != 0)  /* write the data */
    {
    perror ("AT91_TC_SET_CLOCK failed");
    close (file4);
    exit (1);
    } 
  sleep(500);
  close (file4);
  exit(0);
  }