Linux 学习记录58(ARM篇)
本文目录
- Linux 学习记录58(ARM篇)
- 一、GIC相关寄存器
- 1. 系统框图
- 2. 中断号对应关系
- 二、GICD寄存器
- 1. GICD_CTLR
- 2. GICD_ISENABLERx
- 3. GICD_IPRIORITYRx
- 4. GICD_ITARGETSRx
- 5. GICD_ICPENDRx
- 三、GICC寄存器
- 1. GICC_PMR
- 2. GICC_CTLR
- 3. GICC_IAR
- 4. GICC_EOIR
- 四、封装函数
- 1. 寄存器封装
- 2. EXTI初始化结构体/枚举封装
- 3. GICD初始化结构体/枚举
- 4. GICC初始化结构体/枚举
- 5. EXTI函数
- 6. GICD函数
- 7. GICC函数
- 8. 使用示例
一、GIC相关寄存器
1. 系统框图
- PPI:私有外设中断号:(ID:0~15)
- SPI:共享外设中断号:(ID:16~31)
- SGI:软件产生的中断号:(ID:0~287)
总结:
GIC层一共管理288个中断号(ID:0 ~ 287),16个SGIS,16个PPIS,256个SPIS
2. 中断号对应关系
例:
二、GICD寄存器
1. GICD_CTLR
功能:使能CPU
2. GICD_ISENABLERx
功能:设置GICD层中断使能
该寄存器共有8个(0-8),用于使能GICD层的的288个中断号,每个寄存器32位,分别控制32个中断号的使能
计算方式
置1 为使能
int ID = 99//中断号,以外部中断号为99的ID为例
ID / 32 = 3
使用" GICD_ISENABLER3 "寄存器即可
ID % 32 = 3
使用" GICD_ISENABLER3 "寄存器的第 "3 bit位" 即可
3. GICD_IPRIORITYRx
功能:设置GICD层中断优先级
计算方式
备注:设置中断优先级值的范围在:0 ~ 2^5 -1 GICD层中断优先级,需要比GICC层中断优先级高 中断优先级的值越小,代表中断优先级越高
int ID = 99//中断号,以外部中断号为99的ID为例
ID / 4 = 24
使用" GICD_IPRIORITYR第24个"寄存器即可
ID % 4 = 3 (*8+3) =27
从" GICD_IPRIORITYR第24个 "寄存器的第 "27 ~ 37(27+4) bit位" 即可
4. GICD_ITARGETSRx
功能:分配给cpu0 或者 cpu1
该寄存器共有72个(0~71)个寄存器 [ 288个中断号/每个寄存器控制4个中断号的分配 ]
计算方式
int ID = 99//中断号,以外部中断号为99的ID为例
ID / 4 = 24
使用" GICD_ITARGETSR第24个"寄存器即可
ID % 4 = 3 (*8) =24
从" GICD_ITARGETSR第24个 "寄存器的第 "24 ~ 25(24+1) bit位" 即可
5. GICD_ICPENDRx
功能:清除GICD层挂起的中断标志位
该寄存器给共有8个寄存器[ 228个中断号/每个寄存器控制32个中断号的清除 ]
计算方式
置1为清除
int ID = 99//中断号,以外部中断号为99的ID为例
ID / 32 = 3
使用" GICD_ICPENDR第3个"寄存器即可
ID % 32 = 3
从" GICD_ICPENDR第3个 "寄存器的第 "3 bit位" 即可
三、GICC寄存器
1. GICC_PMR
功能:设置GICC层中断优先级
2. GICC_CTLR
功能:使能cpu中断
3. GICC_IAR
功能:获取中断号,这个寄存器只读
4. GICC_EOIR
功能:清除获取到中断号
四、封装函数
1. 寄存器封装
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;#define __IO volatile
typedef struct{__IO uint32_t RTSR1; // EXTI rising trigger selection register __IO uint32_t FTSR1; // EXTI falling trigger selection register __IO uint32_t SWIER1; // EXTI software interrupt event register __IO uint32_t RPR1; // EXTI rising edge pending register__IO uint32_t FPR1; // EXTI falling edge pending register__IO uint32_t TZENR1; // EXTI TrustZone enable register__IO uint32_t RES1[2]; __IO uint32_t RTSR2; // EXTI rising trigger selection register__IO uint32_t FTSR2; // EXTI falling trigger selection register__IO uint32_t SWIER2; // EXTI software interrupt event register__IO uint32_t RPR2; // EXTI rising edge pending register__IO uint32_t FPR2; // EXTI falling edge pending register__IO uint32_t TZENR2; // EXTI TrustZone enable register__IO uint32_t RES2[2];__IO uint32_t RTSR3; // EXTI rising trigger selection register__IO uint32_t FTSR3; // EXTI falling trigger selection register__IO uint32_t SWIER3; // EXTI software interrupt event register__IO uint32_t RPR3; // EXTI rising edge pending register__IO uint32_t FPR3; // EXTI falling edge pending register__IO uint32_t TZENR3; // EXTI TrustZone enable register__IO uint32_t RES3[2];__IO uint32_t EXTICR1; // EXTI external interrupt selection register 1__IO uint32_t EXTICR2; // EXTI external interrupt selection register 2 __IO uint32_t EXTICR3; // EXTI external interrupt selection register 3 __IO uint32_t EXTICR4; // EXTI external interrupt selection register 4 __IO uint32_t RES4[4];__IO uint32_t C1IMR1; // EXTI CPU1 wakeup with interrupt mask register__IO uint32_t C1EMR1; // EXTI CPU1 wakeup with event mask register__IO uint32_t RES5[2];__IO uint32_t C1IMR2; // EXTI CPU1 wakeup with interrupt mask register__IO uint32_t C1EMR2; // EXTI CPU1 wakeup with event mask register__IO uint32_t RES6[2];__IO uint32_t C1IMR3; // EXTI CPU1 wakeup with interrupt mask register __IO uint32_t C1EMR3; // EXTI CPU1 wakeup with event mask register __IO uint32_t RES7[6];__IO uint32_t C2IMR1; // EXTI CPU2 wakeup with interrupt mask register__IO uint32_t C2EMR1; // EXTI CPU2 wakeup with event mask register__IO uint32_t RES8[2];__IO uint32_t C2IMR2; // EXTI CPU2 wakeup with interrupt mask register__IO uint32_t C2EMR2; // EXTI CPU2 wakeup with event mask register__IO uint32_t RES9[2];__IO uint32_t C2IMR3; // EXTI CPU2 wakeup with interrupt mask register __IO uint32_t C2EMR3; // EXTI CPU2 wakeup with event mask register __IO uint32_t RES10[2];
}EXTI_TypeDef;#define EXTI ((EXTI_TypeDef*)0x5000D000)typedef struct {volatile unsigned int CTRL;volatile unsigned int TYPER;volatile unsigned int IIDR;volatile unsigned int RES1[29];volatile unsigned int IGROUPR[9];volatile unsigned int RES2[23];volatile unsigned int ISENABLER[9];volatile unsigned int RES3[23];volatile unsigned int ICENABLER[9];volatile unsigned int RES4[23];volatile unsigned int ISPENDR[9];volatile unsigned int RES5[23];volatile unsigned int ICPENDR[9];volatile unsigned int RES6[23];volatile unsigned int ISACTIVER[9];volatile unsigned int RES7[23];volatile unsigned int ICACTIVER[9];volatile unsigned int RES8[23];volatile unsigned int IPRIORITYR[72];volatile unsigned int RES9[184];volatile unsigned int ITARGETSR[72];volatile unsigned int RES10[184]; volatile unsigned int ICFGR[18];volatile unsigned int RES11[46];}GICD_TypeDef;
#define GICD ((GICD_TypeDef*)0xA0021000)typedef struct {volatile unsigned int CTRL;volatile unsigned int PMR;volatile unsigned int BRR;volatile unsigned int IAR;volatile unsigned int EOIR;volatile unsigned int RPR;volatile unsigned int HPPIR;volatile unsigned int ABPR;volatile unsigned int AIAR;volatile unsigned int AEOIR;volatile unsigned int AHPPIR;volatile unsigned int RES1[41];volatile unsigned int APR0;volatile unsigned int RES2[3];volatile unsigned int NSAPR0;volatile unsigned int RES3[6];volatile unsigned int IIDR;volatile unsigned int RES4[960];volatile unsigned int DIRDIR;}GICC_TypeDef;
#define GICC ((GICC_TypeDef*)0xA0022000)
2. EXTI初始化结构体/枚举封装
typedef enum
{EXTI_GPIOA = 0x0,EXTI_GPIOB,EXTI_GPIOC,EXTI_GPIOD,EXTI_GPIOE,EXTI_GPIOF,EXTI_GPIOG,EXTI_GPIOH,EXTI_GPIOI,EXTI_GPIOJ,EXTI_GPIOK,EXTI_GPIOZ,
}EXTI_GPIOxTypedef;typedef enum
{EXTI_Trigger_Rising = 0x0,//上升EXTI_Trigger_Falling,//下降EXTI_Trigger_Rising_Falling,//双边沿
}EXTI_TriggerTypedef;typedef struct
{uint16_t EXTI_GPIOx;//GPIO组号uint16_t EXTI_Line;//中断线uint8_t EXTI_Trigger;//触发方式uint8_t EXTI_Wakeup;//是否屏蔽}EXTI_InitTypeDef;
/*相关函数声明*/
/*外部中断初始化*/
void EXTI_Init(EXTI_InitTypeDef* EXTI_Init);
/*清除挂起标志位s*/
void EXTI_Clr_FPR1(uint16_t ID);
3. GICD初始化结构体/枚举
typedef enum
{/*和GICC共用*/GIC_CPU0 = 0x1,//CPU0GIC_CPU1,//CPU1GIC_CPU1_0,//CPU1和CPU0
}GIC_CPUTypedef;typedef struct
{uint8_t GICD_CPU;//使能的CPUuint8_t GICD_Allocation_CPU;//分配CPUuint8_t GICD_priority;//设置优先级uint16_t GICD_interrupt_ID;//使能的中断号}GICD_InitTypeDef;
/*相关函数声明*/
/*GICD初始化*/
void GICD_Init(GICD_InitTypeDef* GICD_Init);
/*清除挂起标志位*/
void GICD_Clr_ICPENDR(uint16_t ID);
4. GICC初始化结构体/枚举
typedef struct
{uint8_t GICC_priority;//设置优先级uint8_t GICC_CPU;//使能的CPU
}GICC_InitTypeDef;
/*相关函数声明*/
/*GICC初始化*/
void GICC_Init(GICD_InitTypeDef* GICD_Init);
/*获取中断号*/
uint32_t GICC_Get_IAR(void);
/*清除中断号*/
void GICC_Clr_EOIR(uint32_t ID);
5. EXTI函数
void EXTI_Init(EXTI_InitTypeDef* EXTI_Init)
{uint8_t py = 0;py = EXTI_Init->EXTI_Line/4;py++;switch(py){case 1:{/*连接Pin到EXTI_line*/EXTI->EXTICR1 &= ~(0xff << ((EXTI_Init->EXTI_Line%4) *8));EXTI->EXTICR1 |= (EXTI_Init->EXTI_GPIOx << ((EXTI_Init->EXTI_Line%4) *8));}break;case 2:{/*连接Pin到EXTI_line*/EXTI->EXTICR2 &= ~(0xff << ((EXTI_Init->EXTI_Line%4) *8));EXTI->EXTICR2 |= (EXTI_Init->EXTI_GPIOx << ((EXTI_Init->EXTI_Line%4) *8));}break;case 3:{EXTI->EXTICR3 &= ~(0xff << ((EXTI_Init->EXTI_Line%4) *8));EXTI->EXTICR3 |= (EXTI_Init->EXTI_GPIOx << ((EXTI_Init->EXTI_Line%4) *8));}break;case 4:{/*连接Pin到EXTI_line*/EXTI->EXTICR4 &= ~(0xff << ((EXTI_Init->EXTI_Line%4) *8));EXTI->EXTICR4 |= (EXTI_Init->EXTI_GPIOx << ((EXTI_Init->EXTI_Line%4) *8));}break;default : break;}switch(EXTI_Init->EXTI_Trigger){case EXTI_Trigger_Rising :{//上升沿/*设置为上升降沿触发*/EXTI->RTSR1 &= ~(0x1 << EXTI_Init->EXTI_Line);EXTI->RTSR1 |= (0x1 << EXTI_Init->EXTI_Line);}break;case EXTI_Trigger_Falling :{//下降沿/*设置为下降沿触发*/EXTI->FTSR1 &= ~(0x1 << EXTI_Init->EXTI_Line);EXTI->FTSR1 |= (0x1 << EXTI_Init->EXTI_Line);}break;case EXTI_Trigger_Rising_Falling :{//双边沿/*设置下降沿触发*/EXTI->FTSR1 &= ~(0x1 << EXTI_Init->EXTI_Line);EXTI->FTSR1 |= (0x1 << EXTI_Init->EXTI_Line);/*设置为上升降沿触发*/EXTI->RTSR1 &= ~(0x1 << EXTI_Init->EXTI_Line);EXTI->RTSR1 |= (0x1 << EXTI_Init->EXTI_Line);}break;}/*设置EXTI不屏蔽*/EXTI->C1IMR1 &= ~(0x1 << EXTI_Init->EXTI_Line);EXTI->C1IMR1 |= (0x1 << EXTI_Init->EXTI_Line);/*设置EXTI不屏蔽*/EXTI->C1IMR1 &= ~(0x1 << EXTI_Init->EXTI_Line);EXTI->C1IMR1 |= (0x1 << EXTI_Init->EXTI_Line);
}/*清除挂起标志位s*/
void EXTI_Clr_FPR1(uint16_t ID)
{EXTI->FPR1 |= 0x1 << ID;
}
6. GICD函数
/*GICD初始化*/
void GICD_Init(GICD_InitTypeDef* GICD_Init)
{/*使能GICD*/GICD->CTRL &= ~(0x3);GICD->CTRL |= GICD_Init->GICD_CPU;/*设置使能寄存器*/GICD->ISENABLER[GICD_Init->GICD_interrupt_ID/32] |= 0x1<<(GICD_Init->GICD_interrupt_ID%32);/*设置中断优先级*/GICD->IPRIORITYR[GICD_Init->GICD_interrupt_ID/4] &= ~(0x1F << ((GICD_Init->GICD_interrupt_ID%32)*8+3));GICD->IPRIORITYR[GICD_Init->GICD_interrupt_ID/4] |= GICD_Init->GICD_priority << ((GICD_Init->GICD_interrupt_ID%32)*8+3);/*设置中断优先级*/GICD->ITARGETSR[GICD_Init->GICD_interrupt_ID/4] &= ~(0x3 << ((GICD_Init->GICD_interrupt_ID%32)*8));GICD->ITARGETSR[GICD_Init->GICD_interrupt_ID/4] |= GICD_Init->GICD_Allocation_CPU << ((GICD_Init->GICD_interrupt_ID%32)*8);
}
/*清除挂起标志位*/
void GICD_Clr_ICPENDR(uint16_t ID)
{GICD->ICPENDR[ID/32] |= 0x1 << ID%32;
}
7. GICC函数
/*GICC初始化*/
void GICC_Init(GICC_InitTypeDef* GICC_Init)
{/*使能CICC*/GICC->CTRL &= ~(0x3);GICC->CTRL |= GICC_Init->GICC_CPU;/*中断优先级设置*/GICC->PMR &= ~(0x1F << 3);GICC->PMR |= GICC_Init->GICC_priority << 3;
}
8. 使用示例
EXTI_InitTypeDef EXTI_InitStructure;EXTI_InitStructure.EXTI_GPIOx = EXTI_GPIOF;EXTI_InitStructure.EXTI_Line = 9;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_InitStructure.EXTI_Wakeup = 1;EXTI_Init(&EXTI_InitStructure);EXTI_InitStructure.EXTI_Line = 8;EXTI_Init(&EXTI_InitStructure);EXTI_InitStructure.EXTI_Line = 7;EXTI_Init(&EXTI_InitStructure);GICD_InitTypeDef GICD_InitStructure;GICD_InitStructure.GICD_CPU = GIC_CPU0;GICD_InitStructure.GICD_Allocation_CPU = GIC_CPU0;GICD_InitStructure.GICD_priority = 0;GICD_InitStructure.GICD_interrupt_ID = 99;GICD_Init(&GICD_InitStructure);GICD_InitStructure.GICD_priority = 1;GICD_InitStructure.GICD_interrupt_ID = 98;GICD_Init(&GICD_InitStructure);GICD_InitStructure.GICD_priority = 2;GICD_InitStructure.GICD_interrupt_ID = 97;GICD_Init(&GICD_InitStructure);GICC_InitTypeDef GICC_InitStructure;GICC_InitStructure.GICC_priority = 4;GICC_InitStructure.GICC_CPU = GIC_CPU0;GICC_Init(&GICC_InitStructure);