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C语言驱动之配置串口（基于S3C2440开发板）
（https://blog.csdn.net/Gaodes/article/details/81775919）
C语言驱动之配置LCD（基于S3C2440开发板）（https://blog.csdn.net/Gaodes/article/details/81775882）

irq.c

@@ -0,0 +1,189 @@
+#include "irq.h"
+#include <string.h>
+#include <s3c2440.h>
+#include "type.h"
+
+static irqEvent_t G_IRQEvents[IRQ_MAX];
+
+
+//中断总是初始化
+void irq_init(void)
+{
+	 int i; 	
+
+	 memset(G_IRQEvents,0,sizeof(G_IRQEvents));  //初始化信息
+
+	 //初始化所有的中断寄存器
+	 EINTMASK = 0xFFFFFFFF;
+	 INTSUBMSK = 0xFFFFFFFF;
+	 INTMSK = 0xFFFFFFFF;
+
+	 EINTPEND=  0xFFFFFFFF;
+	 SUBSRCPND =  0xFFFFFFFF;
+	 SRCPND =  0xFFFFFFFF;
+	 INTPND =  0xFFFFFFFF;
+
+	 INTMOD = 0; 
+
+	 //初始化所有信息结构体
+	 for(i = 0; i < IRQ_MAX; i++)
+	 {
+	 	G_IRQEvents[i].irqno = i;
+		G_IRQEvents[i].parent = -1;
+		G_IRQEvents[i].irq = NULL;
+
+		if(i >= IRQ_SUB_EINT4 && i <= IRQ_SUB_EINT7)
+		{
+			G_IRQEvents[i].parent = IRQ_EINT4_7;
+		}
+		else if(i >= IRQ_SUB_EINT8 && i <= IRQ_SUB_EINT23)
+		{
+			G_IRQEvents[i].parent = IRQ_EINT8_23;
+		}
+		else if(i >= IRQ_SUB_RXD0 && i <= IRQ_SUB_ERR0)
+		{
+			G_IRQEvents[i].parent = IRQ_UART0;
+		}
+		else if(i >= IRQ_SUB_RXD1 && i <= IRQ_SUB_ERR1)
+		{
+			G_IRQEvents[i].parent = IRQ_UART1;
+		}
+		else if(i >= IRQ_SUB_RXD2 && i <= IRQ_SUB_ERR2)
+		{
+			G_IRQEvents[i].parent = IRQ_UART2;
+		}
+		else if(i >= IRQ_SUB_TC && i <= IRQ_SUB_ADC_S)
+		{
+			G_IRQEvents[i].parent = IRQ_ADC;
+		}
+		else if(i >= IRQ_SUB_CAM_P && i <= IRQ_SUB_CAM_C)
+		{
+			G_IRQEvents[i].parent = IRQ_CAM;
+		}
+		else if(i >= IRQ_SUB_AC97 && i <= IRQ_SUB_WDT)
+		{
+			G_IRQEvents[i].parent = IRQ_WDT_AC97;
+		}
+	 }
+} 
+
+
+
+//中断安装  		
+void irq_install(IRQ_E irqno, IRQHandler irq)
+{
+  //1.填充实际的中断处理函数
+  G_IRQEvents[irqno].irq = irq;
+
+  //2.打开对应的开关
+  if(irqno >= IRQ_SUB_EINT4 && irqno <= IRQ_SUB_EINT23)
+  {
+  	BIT_CLR(EINTMASK,(irqno- IRQ_SUB_EINT4 +4));  //打开外部二级开关
+	BIT_CLR(INTMSK, G_IRQEvents[irqno].parent);   //打开对应的一级开关
+  }
+  else if(irqno >= IRQ_SUB_RXD0 && irqno <= IRQ_SUB_WDT)
+  {
+  	BIT_CLR(INTSUBMSK,(irqno- IRQ_SUB_RXD0));  //打开外部二级开关
+	BIT_CLR(INTMSK, G_IRQEvents[irqno].parent);   //打开对应的一级开关 	
+  }
+  else
+  {
+  	BIT_CLR(INTMSK,irqno);  //打开对应的一级开关
+  }
+}
+
+
+//中断卸载		
+void irq_unstall(IRQ_E irqno)
+{
+  //1.填充实际的中断处理函数
+  G_IRQEvents[irqno].irq = NULL;
+
+  //2.打开对应的开关
+  if(irqno >= IRQ_SUB_EINT4 && irqno <= IRQ_SUB_EINT23)
+  {
+  	BIT_SET(EINTMASK,(irqno- IRQ_SUB_EINT4 +4));  //打开外部二级开关
+	BIT_SET(INTMSK, G_IRQEvents[irqno].parent);   //打开对应的一级开关
+  }
+  else if(irqno >= IRQ_SUB_RXD0 && irqno <= IRQ_SUB_WDT)
+  {
+  	BIT_SET(INTSUBMSK,(irqno- IRQ_SUB_RXD0));  //打开外部二级开关
+	BIT_SET(INTMSK, G_IRQEvents[irqno].parent);   //打开对应的一级开关 	
+  }
+  else
+  {
+  	BIT_SET(INTMSK,irqno);  //打开对应的一级开关
+  }
+
+
+}
+#define EINTIRQ_RUN(start,end)\
+  for(i = start; i <= end; i++) \
+  {	\
+	   if(EINTPEND &(1 << i)) \
+	   { \
+	   		BIT_SET(EINTPEND,i);  	   /*二级未决中断清除*/	\
+			if(	G_IRQEvents[IRQ_SUB_EINT4+(i - 4)].irq)	\
+			{ \
+	   		 G_IRQEvents[IRQ_SUB_EINT4+(i - 4)].irq();\
+			}  \
+			break;	 \
+	   } \
+  } break;
+
+#define SUBIRQ_RUN(start,end) \
+  for(i = start; i <= end; i++) \
+  {	\
+	   if(SUBSRCPND &(1 << i)) \
+	   { \
+	   		BIT_SET(SUBSRCPND,i);  \
+			if(	G_IRQEvents[IRQ_SUB_RXD0+i].irq)	\
+			{ \
+	   		    G_IRQEvents[IRQ_SUB_RXD0+i].irq();\
+			} \
+			break;	 \
+	   } \
+  } break;
+
+//中断分发		
+void irq_dispatch(void)
+{
+  int ofs = INTOFFSET;
+  int i;
+
+  switch(ofs)
+  {
+  	case IRQ_EINT4_7:
+			EINTIRQ_RUN(4,7);
+	case IRQ_EINT8_23:
+			EINTIRQ_RUN(8,23);
+	case IRQ_WDT_AC97:
+		    SUBIRQ_RUN(13,14);
+	 case IRQ_CAM:
+			SUBIRQ_RUN(11,12);
+	case IRQ_ADC:
+			SUBIRQ_RUN(9,10);
+	case IRQ_UART2:
+			SUBIRQ_RUN(6,8);
+	case IRQ_UART1:
+			SUBIRQ_RUN(3,5);
+	case IRQ_UART0:
+			SUBIRQ_RUN(0,2);
+
+    default:  //默认一级中断
+		if(G_IRQEvents[ofs].irq)
+		{
+			G_IRQEvents[ofs].irq();
+		}
+		break;
+  }
+
+  //2.一级中断清除
+  BIT_SET(SRCPND,ofs);
+  BIT_SET(INTPND,ofs);
+}  
+
+
+
+
+

irq.h

@@ -0,0 +1,109 @@
+#ifndef __IRQ_H_
+#define __IRQ_H_
+
+typedef enum
+{
+	//32个一级中断
+	IRQ_EINT0 = 0,
+	IRQ_EINT1 = 1,
+	IRQ_EINT2 = 2,
+	IRQ_EINT3 = 3,
+	IRQ_EINT4_7,			//有二级外部中断
+	IRQ_EINT8_23,			//有二级外部中断
+	IRQ_CAM,
+	IRQ_BATT_FLT,
+	IRQ_TICK,
+	IRQ_WDT_AC97,	   	    //有二级内部中断
+	IRQ_TIMER0,
+	IRQ_TIMER1,
+	IRQ_TIMER2,
+	IRQ_TIMER3,
+	IRQ_TIMER4,
+	IRQ_UART2,	 			//有二级内部中断
+	IRQ_LCD,
+	IRQ_DMA0,
+	IRQ_DMA1,
+	IRQ_DMA2,
+	IRQ_DMA3,
+	IRQ_SDI,
+	IRQ_SPI0,
+	IRQ_UART1,			    //有二级内部中断
+	IRQ_UFCON,
+	IRQ_USBD,
+	IRQ_USBH,
+	IRQ_IIC,
+	IRQ_UART0,		 		//有二级内部中断
+	IRQ_SPI1,
+	IRQ_RTC,
+	IRQ_ADC,                 //有二级内部中断
+
+	//以下是二级外部子中断
+	IRQ_SUB_EINT4 = 32,	  //IRQ_SUB_EINT4-7对应一级中断
+	IRQ_SUB_EINT5,
+	IRQ_SUB_EINT6,
+	IRQ_SUB_EINT7,
+
+    IRQ_SUB_EINT8,
+	IRQ_SUB_EINT9,
+	IRQ_SUB_EINT10,
+	IRQ_SUB_EINT11,
+	IRQ_SUB_EINT12,
+	IRQ_SUB_EINT13,
+	IRQ_SUB_EINT14,
+	IRQ_SUB_EINT15,
+	IRQ_SUB_EINT16,
+	IRQ_SUB_EINT17,
+	IRQ_SUB_EINT18,
+	IRQ_SUB_EINT19,
+	IRQ_SUB_EINT20,
+	IRQ_SUB_EINT21,
+	IRQ_SUB_EINT22,
+	IRQ_SUB_EINT23,
+
+	//以下是二级内部中断
+	IRQ_SUB_RXD0 = 52,
+	IRQ_SUB_TXD0,
+	IRQ_SUB_ERR0,
+
+	IRQ_SUB_RXD1,
+	IRQ_SUB_TXD1,
+	IRQ_SUB_ERR1,
+
+	IRQ_SUB_RXD2,
+	IRQ_SUB_TXD2,
+	IRQ_SUB_ERR2,
+
+	IRQ_SUB_TC,
+	IRQ_SUB_ADC_S,
+
+	IRQ_SUB_CAM_P,
+	IRQ_SUB_CAM_C,
+
+	IRQ_SUB_AC97,
+	IRQ_SUB_WDT,
+
+	IRQ_MAX,
+
+}IRQ_E;
+
+
+//2.数据结构体
+typedef void (*IRQHandler)(void);
+typedef struct irqEvent_s
+{
+	int irqno;   //中断源
+	int parent;   //二级中断对应的一级中断号
+
+	IRQHandler irq;
+    void (*irqFun)(void);	//定义一个中断的处理函数
+
+}irqEvent_t;
+
+
+void irq_init(void);   		//中断总是初始化
+void irq_install(IRQ_E irqno, IRQHandler irq);		//中断安装
+void irq_unstall(IRQ_E irqno);		//中断卸载
+void irq_dispatch(void);    //中断分发
+
+#endif 
+