gpio.c

基于MDK的LPC1100处理器开发应用例程

/****************************************************************************
 *   $Id:: gpio.c 3647 2010-06-02 21:33:04Z usb00423                        $
 *   Project: NXP LPC11xx GPIO example
 *
 *   Description:
 *     This file contains GPIO code example which include GPIO 
 *     initialization, GPIO interrupt handler, and related APIs for 
 *     GPIO access.
 *
 ****************************************************************************
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
****************************************************************************/
#include "LPC11xx.h"			/* LPC11xx Peripheral Registers */
#include "gpio.h"
volatile uint32_t gpio0_counter = 0;
volatile uint32_t gpio1_counter = 0;
volatile uint32_t gpio2_counter = 0;
volatile uint32_t gpio3_counter = 0;
volatile uint32_t p0_1_counter  = 0;
volatile uint32_t p1_1_counter  = 0;
volatile uint32_t p2_1_counter  = 0;
volatile uint32_t p3_1_counter  = 0;

/*****************************************************************************
** Function name:		PIOINT0_IRQHandler
**
** Descriptions:		Use one GPIO pin(port0 pin1) as interrupt source
**
** parameters:			None
** Returned value:		None
** 
*****************************************************************************/
void PIOINT0_IRQHandler(void)
{
  uint32_t regVal;

  gpio0_counter++;
  regVal = GPIOIntStatus( PORT0, 1 );
  if ( regVal )
  {
	p0_1_counter++;
	GPIOIntClear( PORT0, 1 );
  }		
  return;
}

/*****************************************************************************
** Function name:		PIOINT1_IRQHandler
**
** Descriptions:		Use one GPIO pin(port1 pin1) as interrupt source
**
** parameters:			None
** Returned value:		None
** 
*****************************************************************************/
void PIOINT1_IRQHandler(void)
{
  uint32_t regVal;

  gpio1_counter++;
  regVal = GPIOIntStatus( PORT1, 1 );
  if ( regVal )
  {
	p1_1_counter++;
	GPIOIntClear( PORT1, 1 );
  }		
  return;
}

/*****************************************************************************
** Function name:		PIOINT2_IRQHandler
**
** Descriptions:		Use one GPIO pin(port2 pin1) as interrupt source
**
** parameters:			None
** Returned value:		None
** 
*****************************************************************************/
void PIOINT2_IRQHandler(void)
{
  uint32_t regVal;

  gpio2_counter++;
  regVal = GPIOIntStatus( PORT2, 1 );
  if ( regVal )
  {
	p2_1_counter++;
	GPIOIntClear( PORT2, 1 );
  }		
  return;
}

/*****************************************************************************
** Function name:		PIOINT3_IRQHandler
**
** Descriptions:		Use one GPIO pin(port3 pin1) as interrupt source
**
** parameters:			None
** Returned value:		None
** 
*****************************************************************************/
void PIOINT3_IRQHandler(void)
{
  uint32_t regVal;

  gpio3_counter++;
  regVal = GPIOIntStatus( PORT3, 1 );
  if ( regVal )
  {
	p3_1_counter++;
	GPIOIntClear( PORT3, 1 );
  }		
  return;
}

/*****************************************************************************
** Function name:		GPIOInit
**
** Descriptions:		Initialize GPIO, install the
**						GPIO interrupt handler
**
** parameters:			None
** Returned value:		true or false, return false if the VIC table
**						is full and GPIO interrupt handler can be
**						installed.
** 
*****************************************************************************/
void GPIOInit( void )
{
  /* Enable AHB clock to the GPIO domain. */
  LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);

#ifdef __JTAG_DISABLED  
  LPC_IOCON->R_PIO1_1  &= ~0x07;
  LPC_IOCON->R_PIO1_1  |= 0x01;
#endif

  /* Set up NVIC when I/O pins are configured as external interrupts. */
  NVIC_EnableIRQ(EINT0_IRQn);
  NVIC_EnableIRQ(EINT1_IRQn);
  NVIC_EnableIRQ(EINT2_IRQn);
  NVIC_EnableIRQ(EINT3_IRQn);
  return;
}

/*****************************************************************************
** Function name:		GPIOSetInterrupt
**
** Descriptions:		Set interrupt sense, event, etc.
**						edge or level, 0 is edge, 1 is level
**						single or double edge, 0 is single, 1 is double 
**						active high or low, etc.
**
** parameters:			port num, bit position, sense, single/doube, polarity
** Returned value:		None
** 
*****************************************************************************/
void GPIOSetInterrupt( uint32_t portNum, uint32_t bitPosi, uint32_t sense,
			uint32_t single, uint32_t event )
{
  switch ( portNum )
  {
	case PORT0:
	  if ( sense == 0 )
	  {
		LPC_GPIO0->IS &= ~(0x1<<bitPosi);
		/* single or double only applies when sense is 0(edge trigger). */
		if ( single == 0 )
		  LPC_GPIO0->IBE &= ~(0x1<<bitPosi);
		else
		  LPC_GPIO0->IBE |= (0x1<<bitPosi);
	  }
	  else
	  	LPC_GPIO0->IS |= (0x1<<bitPosi);
	  if ( event == 0 )
		LPC_GPIO0->IEV &= ~(0x1<<bitPosi);
	  else
		LPC_GPIO0->IEV |= (0x1<<bitPosi);
	break;
 	case PORT1:
	  if ( sense == 0 )
	  {
		LPC_GPIO1->IS &= ~(0x1<<bitPosi);
		/* single or double only applies when sense is 0(edge trigger). */
		if ( single == 0 )
		  LPC_GPIO1->IBE &= ~(0x1<<bitPosi);
		else
		  LPC_GPIO1->IBE |= (0x1<<bitPosi);
	  }
	  else
	  	LPC_GPIO1->IS |= (0x1<<bitPosi);
	  if ( event == 0 )
		LPC_GPIO1->IEV &= ~(0x1<<bitPosi);
	  else
		LPC_GPIO1->IEV |= (0x1<<bitPosi);  
	break;
	case PORT2:
	  if ( sense == 0 )
	  {
		LPC_GPIO2->IS &= ~(0x1<<bitPosi);
		/* single or double only applies when sense is 0(edge trigger). */
		if ( single == 0 )
		  LPC_GPIO2->IBE &= ~(0x1<<bitPosi);
		else
		  LPC_GPIO2->IBE |= (0x1<<bitPosi);
	  }
	  else
	  	LPC_GPIO2->IS |= (0x1<<bitPosi);
	  if ( event == 0 )
		LPC_GPIO2->IEV &= ~(0x1<<bitPosi);
	  else
		LPC_GPIO2->IEV |= (0x1<<bitPosi);  
	break;
	case PORT3:
	  if ( sense == 0 )
	  {
		LPC_GPIO3->IS &= ~(0x1<<bitPosi);
		/* single or double only applies when sense is 0(edge trigger). */
		if ( single == 0 )
		  LPC_GPIO3->IBE &= ~(0x1<<bitPosi);
		else
		  LPC_GPIO3->IBE |= (0x1<<bitPosi);
	  }
	  else
	  	LPC_GPIO3->IS |= (0x1<<bitPosi);
	  if ( event == 0 )
		LPC_GPIO3->IEV &= ~(0x1<<bitPosi);
	  else
		LPC_GPIO3->IEV |= (0x1<<bitPosi);	  
	break;
	default:
	  break;
  }
  return;
}

/*****************************************************************************
** Function name:		GPIOIntEnable
**
** Descriptions:		Enable Interrupt Mask for a port pin.
**
** parameters:			port num, bit position
** Returned value:		None
** 
*****************************************************************************/
void GPIOIntEnable( uint32_t portNum, uint32_t bitPosi )
{
  switch ( portNum )
  {
	case PORT0:
	  LPC_GPIO0->IE |= (0x1<<bitPosi); 
	break;
 	case PORT1:
	  LPC_GPIO1->IE |= (0x1<<bitPosi);	
	break;
	case PORT2:
	  LPC_GPIO2->IE |= (0x1<<bitPosi);	    
	break;
	case PORT3:
	  LPC_GPIO3->IE |= (0x1<<bitPosi);	    
	break;
	default:
	  break;
  }
  return;
}

/*****************************************************************************
** Function name:		GPIOIntDisable
**
** Descriptions:		Disable Interrupt Mask for a port pin.
**
** parameters:			port num, bit position
** Returned value:		None
** 
*****************************************************************************/
void GPIOIntDisable( uint32_t portNum, uint32_t bitPosi )
{
  switch ( portNum )
  {
	case PORT0:
	  LPC_GPIO0->IE &= ~(0x1<<bitPosi); 
	break;
 	case PORT1:
	  LPC_GPIO1->IE &= ~(0x1<<bitPosi);	
	break;
	case PORT2:
	  LPC_GPIO2->IE &= ~(0x1<<bitPosi);	    
	break;
	case PORT3:
	  LPC_GPIO3->IE &= ~(0x1<<bitPosi);	    
	break;
	default:
	  break;
  }
  return;
}

/*****************************************************************************
** Function name:		GPIOIntStatus
**
** Descriptions:		Get Interrupt status for a port pin.
**
** parameters:			port num, bit position
** Returned value:		None
** 
*****************************************************************************/
uint32_t GPIOIntStatus( uint32_t portNum, uint32_t bitPosi )
{
  uint32_t regVal = 0;

  switch ( portNum )
  {
	case PORT0:
	  if ( LPC_GPIO0->MIS & (0x1<<bitPosi) )
		regVal = 1;
	break;
 	case PORT1:
	  if ( LPC_GPIO1->MIS & (0x1<<bitPosi) )
		regVal = 1;	
	break;
	case PORT2:
	  if ( LPC_GPIO2->MIS & (0x1<<bitPosi) )
		regVal = 1;		    
	break;
	case PORT3:
	  if ( LPC_GPIO3->MIS & (0x1<<bitPosi) )
		regVal = 1;		    
	break;
	default:
	  break;
  }
  return ( regVal );
}

/*****************************************************************************
** Function name:		GPIOIntClear
**
** Descriptions:		Clear Interrupt for a port pin.
**
** parameters:			port num, bit position
** Returned value:		None
** 
*****************************************************************************/
void GPIOIntClear( uint32_t portNum, uint32_t bitPosi )
{
  switch ( portNum )
  {
	case PORT0:
	  LPC_GPIO0->IC |= (0x1<<bitPosi); 
	break;
 	case PORT1:
	  LPC_GPIO1->IC |= (0x1<<bitPosi);	
	break;
	case PORT2:
	  LPC_GPIO2->IC |= (0x1<<bitPosi);	    
	break;
	case PORT3:
	  LPC_GPIO3->IC |= (0x1<<bitPosi);	    
	break;
	default:
	  break;
  }
  return;
}

/*****************************************************************************
** Function name:		GPIOSetValue
**
** Descriptions:		Set/clear a bitvalue in a specific bit position
**						in GPIO portX(X is the port number.)
**
** parameters:			port num, bit position, bit value
** Returned value:		None
**
*****************************************************************************/
void GPIOSetValue( uint32_t portNum, uint32_t bitPosi, uint32_t bitVal )
{
  LPC_GPIO[portNum]->MASKED_ACCESS[(1<<bitPosi)] = (bitVal<<bitPosi);
}

/*****************************************************************************
** Function name:		GPIOSetDir
**
** Descriptions:		Set the direction in GPIO port
**
** parameters:			port num, bit position, direction (1 out, 0 input)
** Returned value:		None
**
*****************************************************************************/
void GPIOSetDir( uint32_t portNum, uint32_t bitPosi, uint32_t dir )
{
  if(dir)
	LPC_GPIO[portNum]->DIR |= 1<<bitPosi;
  else
	LPC_GPIO[portNum]->DIR &= ~(1<<bitPosi);
}

/******************************************************************************
**                            End Of File
******************************************************************************/