wave_burst.c

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*-----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*-----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*-----------------------------------------------------------------------------
//* File Name           : wave_burst.c
//* Object              : AT91 - Timer Counter - Burst waveform generation
//*
//* Exported resources  : main
//*
//* 1.0 30/09/98 JLV    : Creation
//* 2.0 24/07/00  PF    : Clean up
//*-----------------------------------------------------------------------------
/*
Configure the channel 0 of the Timer Counter (TC) of the AT91
to aim Single waveform generation :
- clock = MCKI / 1024
- Register C = 0xA000
  toggle TIOA1 when reached
  generate trigger to restart the timer

Configure the channel 1 of the Timer Counter (TC) of the AT91
to aim single waveform generation by anding the clock with TIOA1 :
- clock = MCKI / 1024 ANDed with XC1 (TIOA0)
- Register C = 0x4000
  toggle TIOA1 when reached
  generate trigger to restart the timer
--------------------------------------------------------------------------------
          ___     ___     ___     ___     ___     ___     _
  TIOA0 _|   |___|   |___|   |___|   |___|   |___|   |___|   red LED / output
          _   ___   _     _   ___   _     _   ___   _     _
  TIOA1 _| |_|   |_| |___| |_|   |_| |___| |_|   |_| |___|   amber LED / output
--------------------------------------------------------------------------------
*/

#include    "periph/stdc/std_c.h"
#include    "targets/eb40/eb40.h"
#include    "parts/r40807/reg_r40807.h"


//*-----------------------------------------------------------------------------
//* Function Name       : main
//* Object              : AT91 - Timer Counter - Burst waveform generation
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : None
//*-----------------------------------------------------------------------------
int main ( void )
//* Begin
{
    /* Enable and clear PIO pin corresponding to TIOA0, TIOB0 and TIOA1 */
    PIO_PER  = (1<<PIOTIOA0) | (1<<PIOTIOA1) | (1<<PIOTIOB0) ;
    PIO_OER  = (1<<PIOTIOA0) | (1<<PIOTIOA1) | (1<<PIOTIOB0) ;
    PIO_CODR = (1<<PIOTIOA0) | (1<<PIOTIOA1) | (1<<PIOTIOB0) ;


	TCB0_BMR = TC_TIOA0XC1 ;			/* Define XC1 as TIOA0 for channel 0 */

    PIO_PDR = (1<<PIOTIOA1) ;			/* Define TIOA1 as peripheral */

    TC1_CCR = TC_CLKDIS ;				/* Disable the timer 1 */


	/* Initialize the mode of the channel 1 */
    TC1_CMR =
        TC_ASWTRG_SET_OUTPUT   |        /* ASWTRG  : software trigger set TIOA */
        TC_ACPC_TOGGLE_OUTPUT  |        /* ACPC    : Register C compare toggle TIOA */
        TC_WAVE				   |        /* WAVE    : Waveform mode */
        TC_CPCTRG              |        /* CPCTRG  : Register C compare trigger enable */
        TC_BURST_XC1		   |        /* BURST   : XC1 is ANDed with the selected clock */
        TC_CLKS_MCK1024 ;   	 		/* TCCLKS  : MCKI / 1024 */


	TC1_RC = 0x4000 ;					/* Initialize the RC Register value */
    TC1_CCR = TC_CLKEN ;				/* Enable the clock of the timer */
    TC1_CCR = TC_SWTRG ;				/* Trig the timer */

    PIO_PDR = (1<<PIOTIOA0) ;			/* Define TIOA0 as peripheral */
    TC0_CCR = TC_CLKDIS ;				/* Disable the timer 0 */


	/* Initialize the mode of the timer 0 */
    TC0_CMR =
        TC_ASWTRG_SET_OUTPUT   |        /* ASWTRG  : software trigger set TIOA */
        TC_ACPC_TOGGLE_OUTPUT  |        /* ACPC    : Register C compare toggle TIOA */
        TC_WAVE				   |        /* WAVE    : Waveform mode */
        TC_CPCTRG              |        /* CPCTRG  : Register C compare trigger enable */
        TC_CLKS_MCK1024 ;   	 		/* TCCLKS  : MCKI / 1024 */


    TC0_RC = 0xA000 ;					/* Initialize the RC Register value */
    TC0_CCR = TC_CLKEN ;				/* Enable the clock of the timer */
    TC0_CCR = TC_SWTRG ;				/* Trigg the timer */

    return(0);
}//* End