1.中断

硬件中断：直接让外部的硬件产生中断，CPU获取中断源并执行异常处理流程

1.需求：（中断的原理一样，但外设是按键）按键产生中断，并在中断处理中串口发送消息
2.原理图：
	UART_RING --> key2 --> 按键按下会有电平变化
	GPX1_1 --> 功能复用为 XEINT9
	
3，芯片手册：
	GPIO：
	GPX1_1:    0x11000C20  [7:4]  0xF = EXT_INT41[1]
	
	
	EXT_INT41_CON[1] 0x11000E04 [6:4] 0x2 = Triggers Falling edge
	EXT_INT41_MASK  0x11000F04  [1]  0x0 = Enables Interrupt
	EXT_INT41_PEND  0x11000F44  [1]  0x1 = Interrupt Occurs ?

GIC中断管理:

中断ID号： 25（只包含SPI）–>57（包含SGI 和PPI）

The Distributor provides a programming interface for:
分发器做的事情

1. Enabling the forwarding of interrupts to the CPU interfaces globally.
使能到 CPU interface的功能
ICDDCR   0x10490000 [0] 1 = GIC monitors the peripheral interrupt signals and forwards pending interrupts to the CPU interfaces.

2. Enabling or disabling each interrupt.
使能某一个中断
ICDISER1 0x10490104 [25] 1 = Enables the corresponding interrupt.

3. Setting the priority level of each interrupt.
设置每一个中断的优先级
ICDIPR14 0x10490438 [15:8]  0x1   0~255

4. Setting the target processor list of each interrupt.
设置要去哪个处理器
ICDIPTR14 0x10490838 [15:8]  0x1  =CPU interface 0

5. Setting each peripheral interrupt to be level-sensitive or edge-triggered.
设置外设中断怎么触发 //寄存器只读，所以不用
6. Setting each interrupt as either secure or Non-secure if the GIC implements the Security Extensions.
安全模式 //不用
7. Sending an SGI to one or more target processors.
设置软件中断 //不用

清除中断标志：

ICDICPR1：0x10490284  [25]  1=For SPIs, the corresponding 
interrupt is pending on at least one processor.

CPU interface：

Each CPU interface block provides:
 Interface for a processor that operates with the GIC.
 Programming interface for:
CPU interface做的事情：

1. Enabling the signaling of interrupt requests by the CPU interface.
使能CPU interface通道，让interface能够与CPU链接
ICCICR_CPU0 0x10480000 [0] 1 = Enables signaling of interrupts

2. Acknowledging an interrupt.
应答中断（中断处理前）
ICCIAR_CPUn  0x1048000C [9:0]  return interrupt ID(保存应答的ID)
 
3. Indicating completion of the processing of an interrupt.
应答中断（中断处理后）
ICCEOIR_CPUn  0x10480010 [9:0] (告知CPU保存的ID这个中断执行结束)

4. Setting an interrupt priority mask for the processor.
设置优先级掩码
ICCPMR_CPUn 0x10480004 [7:0] 0~255

5. Defining the preemption policy for the processor.
定义抢占策略    //不用
6. Determining the highest priority pending interrupt for the processor.
 //不用

/*===============================================
*   文件名称：main1.h
*   创 建 者: memories
*   创建日期：2023年06月28日
*   描    述：have a nice day
================================================*/
#ifndef __main_H_
#define __main_H_


#define GPA1CON    *(volatile unsigned int *)0x11400020

#define ULCON2     *(volatile unsigned int *)0x13820000
#define UCON2      *(volatile unsigned int *)0x13820004
#define UTRSTAT2   *(volatile unsigned int *)0x13820010
#define UTXH2      *(volatile unsigned int *)0x13820020
#define URXH2      *(volatile unsigned int *)0x13820024
#define UBRDIV2    *(volatile unsigned int *)0x13820028
#define UFRACVAL2  *(volatile unsigned int *)0x1382002C

#define GPX1_1         *(volatile unsigned int *)0x11000C20
#define EXT_INT41_CON  *(volatile unsigned int *)0x11000E04
#define EXT_INT41_MASK *(volatile unsigned int *)0x11000F04
#define EXT_INT41_PEND *(volatile unsigned int *)0x11000F44

#define ICDDCR    *(volatile unsigned int *)0x10490000
#define ICDISER1  *(volatile unsigned int *)0x10490104
#define ICDIPR14  *(volatile unsigned int *)0x10490438
#define ICDIPTR14 *(volatile unsigned int *)0x10490838

#define ICDICPR1  *(volatile unsigned int *)0x10490284

#define ICCICR_CPU0  *(volatile unsigned int *)0x10480000
#define ICCIAR_CPUn  *(volatile unsigned int *)0x1048000C
#define ICCEOIR_CPUn *(volatile unsigned int *)0x10480010
#define ICCPMR_CPUn  *(volatile unsigned int *)0x10480004


void GIC_init();
void UART_init();
void interrupt_init();
void send_str();

#endif



/*===============================================
*   文件名称：main1.c
*   创 建 者: memories
*   创建日期：2023年06月28日
*   描    述：have a nice day
================================================*/
#include "main1.h"

int main(int argc, char *argv[])
{ 
     UART_init();
     GIC_init();
     interrupt_init();
     while(1);
} 


void UART_init()
{
    //设置波特率
    UBRDIV2 = 53;
    UFRACVAL2 = 4;
    //设置串口的工作模式
    GPA1CON &= ~(0xf << 4);
    GPA1CON |= (0x2 << 4);
    //设置UART属性
    ULCON2 = 0x3;

    UCON2 &= ~(0x3 << 2);
    UCON2 |= 1 << 2; //开启发送轮循模式

}
void GIC_init()
{
    ICDDCR |= 0x1;
    ICDISER1 |= 1 << 25;
    ICDIPR14 &= ~(0xff << 8);
    ICDIPR14 |= (0x1 << 8);
    ICDIPTR14 &= ~(0xff << 8);
    ICDIPTR14 |= (0x1 << 8);
    
    ICCICR_CPU0 |= 0x1;
    ICCPMR_CPUn = 255;
}

void interrupt_init()
{
    GPX1_1 |= 0xf << 4;

    EXT_INT41_CON &= ~(0x7 << 4);
    EXT_INT41_CON |= 0x2 << 4;

    EXT_INT41_MASK &= ~(1 << 1);
}

void do_irq()
{
   int data = ICCIAR_CPUn & 0x3ff;
    send_str();
    EXT_INT41_PEND |= 1 << 1;
    ICDICPR1 |= 1 << 25;
    ICCEOIR_CPUn = data;
}

void send_str()
{
    int i = 0;
    char *p = "press\n\r";
    while(p[i] != '\0')
    {
        while(! (UTRSTAT2 & 1<<2));
        UTXH2 = p[i];
        i++;
    }
}

2.pwm

在这里插入图片描述

1.需求：蜂鸣器响起来
2.原理图：
	MOTOR_PWM <--> GPD0_0
3.芯片手册
	GPIO：
	GPD0CON 0x114000A0 [3:0] 0x2 = TOUT_0  //PWM功能
	
	PWM：
	TCONn：可以使能
	TCNTBn:给递减计数器赋初值，以及重新装载计数器
	TCMPBn：比较值
	
Timer Input Clock Frequency = PCLK/({prescaler value + 1})/{divider value}

	TCFG0：0x139D0000 [7:0] 1~255 Prescaler 0 value for timer 0 and 1
	TCFG1: 0x139D0004 [3:0] 0010 = 1/4 div4分频
	TCON: 0x139D0008 [3] 1 = Interval mode (auto-reload)
					 [2] 1 = TOUT_0 inverter-on?
					 
					 [1] 1 = Updates TCNTB0 andTCMPB0
					 		0 = No operation 先置一再置0
					 		
					 [0] 1 = Starts Timer 0				 
	TCNTB0：0x139D000C [31:0] 自动装载值
	TCMPB0：0x139D0010 [31:0] 比较值

/*===============================================
*   文件名称：main2.h
*   创 建 者: memories
*   创建日期：2023年06月28日
*   描    述：have a nice day
================================================*/
#ifndef __main2_H_
#define __main2_H_

#define GPD0CON  *(volatile unsigned int *)0x114000A0 
#define TCFG0  *(volatile unsigned int *)0x139D0000
#define TCFG1  *(volatile unsigned int *)0x139D0004
#define TCON  *(volatile unsigned int *)0x139D0008 
#define TCNTB0  *(volatile unsigned int *)0x139D000C
#define TCMPB0  *(volatile unsigned int *)0x139D0010 

void pwm_init();
void pwm_on();


#endif


/*===============================================
*   文件名称：main2.c
*   创 建 者: memories
*   创建日期：2023年06月28日
*   描    述：have a nice day
================================================*/
#include "main2.h"

int main(int argc, char *argv[])
{
     pwm_init();
     pwm_on();
     while(1);
} 

void pwm_init()
{
    GPD0CON &= ~(0xf); 
    GPD0CON |= (0x2);

    TCFG0 |= 0xff;
    TCFG1 &= ~(0xf);
    TCFG1 |= (0x2);

    TCNTB0 = 3000;
    TCMPB0 = 1500;

    TCON |= 1 << 3;
    TCON |= 1 << 2;
    TCON |= 1 << 1;
    TCON &= ~(1 << 1);
    
}
void pwm_on()
{
    TCON |= 1;
}