gpio.c

基于ADI 公司的blackfin芯片的通用中断框架程序

#include "gpio.h"


void init_gpio(void)
{
	// enable PB1~PB3 input buffer
	PORTFIO_INEN = 0x1c;
	
	// make LED1~LED6 as output
	PORTFIO_DIR = 0x0fc0;
	
	// make LED1~LED6 off
	PORTFIO_CLEAR |= 0x0fc0;
	
	// make PB1~PB3 edge interrupt trigger
	PORTFIO_EDGE = 0x1c;
	
	// make PB1~PB3 interrupt enabled
	PORTFIO_MASKA_SET = 0x1c;
}


#include <stdio.h>

void sys_button_handler(void)
{
	BOOL bHasEvent = FALSE;
	
	EVENT_MSG msg = 0UL;
	
	EVENT_MSG evt = LED6_TOGGLE;	// initial judging LED is LED6
	
	unsigned short bit = 0x4;		// 0100B, PB1
	
	ERR i;
	
	unsigned short data = PORTFIO;

	PORTFIO_CLEAR = 0x1c;			// clear all PB interrupt requests
	
	PUSH_LC0();
	
	for(i=0; i<3; i++)
	{
		if(data & bit)
		{
			bHasEvent = TRUE;
			
			msg |= evt;
		}
		
		evt >>= 1;
			
		bit <<= 1;
	}
	
	POP_LC0();

	if(bHasEvent)
	{
		sig_event(MSG_PORTFG_A_INT);
		
		i = post_message(MSG_PORTFG_A_INT, (void*)msg);
		
		if(i != VALID_SUCCESS)
			puts("message posting error!");
	}
}


ERR msg_button_event_handler(void *param)
{
	int i;
	
	EVENT_MSG bit = LED6_TOGGLE;
	
	unsigned short led = 0x0800;		// LED6
	
	EVENT_MSG msg = (EVENT_MSG)param;

	// 3 button events
	for(i=0; i<3; i++)
	{
		if(msg & bit)
			PORTFIO_TOGGLE = led;
			
		bit >>= 1;
		
		led >>= 1;
	}
	
	return VALID_SUCCESS;
}