test
#include "stm32f4xx.h"
//key gpio a 0 e 2 3 4
//led gpio f 9 10 e 13 14
//beep gpio f 8
//位带操作
//寄存器位带别名 = 0x42000000 + (寄存器的地址-0x40000000)*32 + 引脚编号*4
#define PAin(n) *(volatile uint32_t *)(0x42000000+(((uint32_t)&GPIOA->IDR - 0x40000000)<<5) + (n<<2))
#define PEin(n) *(volatile uint32_t *)(0x42000000+(((uint32_t)&GPIOE->IDR - 0x40000000)<<5) + (n<<2))
#define PFout(n) *(volatile uint32_t *)(0x42000000+(((uint32_t)&GPIOF->ODR - 0x40000000)<<5) + (n<<2))
#define PFin(n) *(volatile uint32_t *)(0x42000000+(((uint32_t)&GPIOF->IDR - 0x40000000)<<5) + (n<<2))
#define PEout(n) *(volatile uint32_t *)(0x42000000+((uint32_t)&GPIOE->ODR - 0x40000000)*32+n*4)
#define LED0 PFout(9)
#define LED1 PFout(10)
#define LED2 PEout(13)
#define LED3 PEout(14)
//定义需要配置的硬件结构体
static GPIO_InitTypeDef GPIO_InitStruct;
static TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
static NVIC_InitTypeDef NVIC_InitStruct;
//初始化LED
void init_led_beep()
{
//1、使能AHB1硬件时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF | RCC_AHB1Periph_GPIOE, ENABLE);
//2、硬件配置
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; //端口模式配置为输出
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; //输出配置为推挽输出
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10 | GPIO_Pin_8; //配置引脚编号为9号引脚
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; //快速50Mhz输出速度
GPIO_Init(GPIOF, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
GPIO_Init(GPIOE, &GPIO_InitStruct);
//3、使能硬件工作
//GPIO_SetBits(GPIOF, GPIO_Pin_9|GPIO_Pin_10);//设置GPIOF9引脚为高电平，灯灭
PFout(8) = 0;
PFout(9) = 1;
PFout(10) = 1;
PEout(13) = 1;
PEout(14) = 1;
}
void TIm1_init(void)
{
//使能TIM1的硬件时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
//TIM1的硬件配置
//配置定时器1分频值、计数值等等
TIM_TimeBaseStructure.TIM_Period = (10000/2)-1; //计数值 168000000/16800 = 10000hz/2，决定定时时间1/2秒
TIM_TimeBaseStructure.TIM_Prescaler = 16800-1; //预分频值 16800-1 + 1 = 16800
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数的方法
// TIM_TimeBaseStructure.TIM_ClockDivision = 0; //在F407是不支持
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM1,TIM_FLAG_Update); //必须先清除配置时候产生的更新标志
//配置定时器1中断的触发方式：时间更新
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
//开启TIM1的NVIC中断
NVIC_InitStruct.NVIC_IRQChannel = TIM1_UP_TIM10_IRQn ; //定时器1的请求通道
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x02; //抢占优先级
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x02; //响应优先级
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; //使能该通道中断，失能
NVIC_Init(&NVIC_InitStruct);
//使能定时器3工作
TIM_Cmd(TIM1, ENABLE);
}
void TIM1_UP_TIM10_IRQHandler(void)
{
//判断TIM3是否有中断请求
if(TIM_GetITStatus(TIM1, TIM_IT_Update) == SET)
{
LED1 ^= 1;
//清空标志位，告诉CPU，已经完成当前中断处理，可以响应新的中断请求
TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
}
}
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
init_led_beep();
TIm1_init();
while(1)
{}
return 0;
}
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