eint2.c

ARM7的I2C读写

#include "configLPC.h"
#include "i2c.h"


extern 	RAMP_CONTROLLER g_ramp;



void eint2_ISR(void)
{                                                      

	OS_ENTER_CRITICAL();

	while (EXTINT & 0x04 != 0)
	{
		//g_ramp.vehicle_num ++;
		uint8 * io_value;
		
		
		//pcf的地址 前4bits固定为 0100 接着的3bits是A2,A1,A0选中多片pcf中的一片 只有一片所以为000 最后1bit读/写位,0为写、1读
		uint8 address_of_pcf8574 = 0x41;
		
		x1226LastRegister = reg;
		
		i2cReadBuffer (address_of_pcf8574, io_value, sizeof (uint8));
		
		//将io口的值写到g_ramp.vehicle_num中
		g_ramp.vehicle_num += *io_value;//字符类型要改 io_value是uint8 和 vehicle_num的类型不同
		//EXTINT = 0x04;

	}
	
	VICVectAddr = 0;
	
	OS_EXIT_CRITICAL();
}
void eint2_process(void)
{

	extern void EINT2_Handler(void);

	PINSEL0 &= ~PCB_PINSEL0_P015_MASK;
	PINSEL0 |= PCB_PINSEL0_P015_EINT2;


	VIC_IntSelect = 0x00000000;
	// UART0中断通道分配到IRQ slot 4
	VIC_VectCntl4 = VIC_VectCntl_ENABLE | VIC_Channel_EINT2;
	// 设置UART0向量地址
	VIC_VectAddr4 = (uint32)EINT2_Handler;					
	// 使能UART0中断
	VIC_IntEnable |= VIC_IntEnable_EINT2;
	
	EXTINT = 0x04;

}