etpuc_gpio.c

mpc55**系列芯片的例程 包括SCI,SPI,TIMER,FIT,EDMA等几乎所有功能的实现

/****************************************************************************
 * FILE NAME: etpuc_gpio.c                      COPYRIGHT (c) freescale 2004*
 * DESCRIPTION:                                     All Rights Reserved     *
 * This function provide general purpose i/o functionality on the eTPU      *
 * allowing the user to configure an eTPU channel as an input or output     *
 *==========================================================================*
 * $Log: etpuc_gpio.c,v $
 * Revision 1.2  2004/11/02 13:43:42  r12110
 * -Added support for building function stand alone or in a set.
 *   -This includes using the global error function if avaialable.
 * -Updated comments in auto generated file to include version number.
 *
 * Revision 1.1  2004/11/01 14:44:45  r12110
 * No changes to code, just updated for CVS and checked into CVS.
 *
 *..........................................................................*
 * 0.01  K Terry     19 March 04  Initial version of file                   *
 * 0.02  K Terry     21 April 04  Removed debug comments                    *
 * 0.03  K Terry     22 April 04  Modifications to reduce code size         *
 * 0.04  K Terry     27 April 04  Removed option to turn off match and      *
 *                                transition events                         *
 * 0.05  K Terry     7  Jun   04  Modified Input Immediate Mode thread (S6) *
 *                                to generate interrupt and DTR             *
 * 0.06  K Terry     22  Jun   04  Mod'd to accomodate changes to directory *
 *                                structure and new location of             *
 *                                of etpu_gpio_auto.h                       *
 *                                                                          *
 * 0.07  G. Emerson  16 July 04   Add DisableOutputBuffer to input init     *
 *                                threads                                   *
 *                                Add disclaimer                            *
 * 0.08  G.Emerson   19 July 04   add () to DisableOutputBuffer calls       *
 * 0.09  J. Loeliger  3/Aug/04    Fixed comments to always use standard C   *
 *                                 open and close pairs. This is needed for *
 *                                 version b097 of the compiler. General    *
 *                                 clean-up of coments and added freescale. *
 ****************************************************************************/
#ifndef __ETPUC_H
#include <etpuc.h>          /*Defines eTPU hardware*/
#endif

#ifndef __ETPUC_COMMON_H
#include <eTPUc_common.h>   /*Standard way to use eTPU*/
#endif

#ifdef GPIO_FUNCTION_NUMBER    /* function is being compiled as part a set? */
#pragma ETPU_function GPIO @ GPIO_FUNCTION_NUMBER;
#else
#pragma ETPU_function GPIO; /* stand alone */
#endif

/* GPIO Specific defines */

/* Host Service Requests */
#define GPIO_OUTPUT_HIGH         7
#define GPIO_OUTPUT_LOW          6
#define GPIO_INPUT_IMMED         5
#define GPIO_INPUT_RISING        4
#define GPIO_INPUT_FALLING       3
#define GPIO_INPUT_EITHER        2
#define GPIO_INPUT_MATCH         1

/* Functions Modes
 FM0 - selects timebase to use
 FM1 set to disable Match and Transition events with INPUT_IMMED host service request */

#define GPIO_USE_TCR1 0
#define GPIO_USE_TCR2 1

/* FM1 - used during INPUT_IMMED host service request to optionally disable
match and transition events */

/******************************************************************************/
/* Function Description                                                       */
/* This function allows the user the configure an eTPU channel as a general   */
/* purpose input or output. 7 function modes are supported These are:         */
/*		1/. Input Mode - Update periodically                                  */
/*		2/. Input Mode - Update on Transition - either edge                   */
/*		3/. Input Mode - Update on Transition - falling edge                  */
/*		4/. Input Mode - Update on Transition - rising edge                   */
/*		5/. Input Mode - Update on request/disable transition and             */
/*                               match updates                                */
/* 		6/. Output Mode - (output low)                                        */
/* 		7/. Output Mode - (output high)                                       */
/******************************************************************************/

/******************************************************************************
* Function Parameters
*
* InputMatch Period: Selects the match register value to define the match
* update period
*
******************************************************************************/
void GPIO (int24 InputMatchPeriod, int24 PinState)
{

	static int24 CurrentCount;
	static int24 NextMatch;

/*---------------------------------------------------------------------------+
|	Thread Name: Output High (S0)                                            |
|	Description: Set channel output high                                     |
+----------------------------------------------------------------------------*/
	if (HostServiceRequest == GPIO_OUTPUT_HIGH)
	{
		SetPinHigh();
		act_unitA = enable_output_buffer;
	}

/*---------------------------------------------------------------------------+
|	Thread Name: Output Low (S1)                                             |
|	Description: Set channel output low                                      |
+----------------------------------------------------------------------------*/
	else if (HostServiceRequest == GPIO_OUTPUT_LOW)
	{
		SetPinLow();
		act_unitA = enable_output_buffer;
	}

/*---------------------------------------------------------------------------+
|	Thread Name: Input Rising (S2)                                           |
|	Description: Configure channel to detect input rising edge               |
|                                                                            |
|	1/. Configure Input Pin Action Control Register 1 (IPAC1)to detect       |
|         rising edge                                                        |
|   2/. Set Channel Mode for SingleMatchSingleTransition                     |
|	3/. Set Comparitor and Timebase Selection for TCR1 capture and TCR1      |
|	      Match (Greater Equal)                                              |
|	4/. Enable Match and Transition Event Handling                           |
+----------------------------------------------------------------------------*/
	else if (HostServiceRequest == GPIO_INPUT_RISING)
	{
		DisableOutputBuffer();
		DetectARisingEdge();

		goto setup1;
	}

/*---------------------------------------------------------------------------+
|	Thread Name: Input Falling (S3)                                          |
|	Description: Configure channel to detect input falling edge              |
|                                                                            |
|	1/. Configure Input Pin Action Control Register 1 (IPAC1)to detect       |
|         falling edge                                                       |
|   2/. Set Channel Mode for SingleMatchSingleTransition                     |
|	3/. Set Comparitor and Timebase Selection for TCR1 capture and TCR1      |
|	      Match (Greater Equal)                                              |
|	4/. Enable Match and Transition Event Handling                           |
+----------------------------------------------------------------------------*/
	else if (HostServiceRequest == GPIO_INPUT_FALLING)
	{
		DisableOutputBuffer();
		DetectAFallingEdge();

		goto setup1;
	}

/*---------------------------------------------------------------------------+
|	Thread Name: Input Either (S4)                                           |
|	Description: Configure channel to detect input rising or falling edge    |
|                                                                            |
|	1/. Configure Input Pin Action Control Register 1 (IPAC1)to detect       |
|         rising or falling edge                                             |
|   2/. Set Channel Mode for SingleMatchSingleTransition                     |
|	3/. Set Comparitor and Timebase Selection for TCR1 capture and TCR1      |
|	      Match (Greater Equal)                                              |
|	4/. Enable Match and Transition Event Handling                           |
+----------------------------------------------------------------------------*/
	else if (HostServiceRequest == GPIO_INPUT_EITHER)
	{
		DisableOutputBuffer();
		DetectAAnyEdge();

setup1:
		SingleMatchSingleTransition();
		TimeBaseAMatchTcr1CaptureTcr1GreaterEqual();
		EnableMatchAndTransitionEventHandling();
	}