STM32F4寄存器初始化系列：时钟开启

 1 static void RCC_Init(void)
 2 {
 3   RCC->APB1ENR|=1<<17;  //使能串口2时钟
 4   RCC->APB1ENR|=1<<14;//SPI2时钟使能
 5   RCC->APB2ENR|=1<<12;//使能SPI1时钟
 6   RCC->APB2ENR|=1<<8;    //使能ADC1
 7   RCC->APB2ENR|=1<<9;    //使能ADC2
 8   RCC->APB2ENR|=1<<10;    //使能ADC3
 9   RCC->APB2ENR|=1<<14;    //使能SYSCFG时钟
10
11   RCC->AHB1ENR|=1;    //使能PORTA时钟
12   RCC->AHB1ENR|=1<<1;    //使能PORTB时钟
13   RCC->AHB1ENR|=1<<2;    //使能PORTC时钟
14   RCC->AHB1ENR|=1<<3;    //使能PORTD时钟
15   RCC->AHB1ENR|=1<<4;     //使能PORTE时钟
16   RCC->AHB1ENR|=1<<5;     //使能PORTE时钟
17   RCC->AHB1ENR|=1<<6;    //使能PORTG时钟
18
19   RCC->APB1ENR|=1<<20;      //使能串口5时钟
20   RCC->APB1ENR|=1<<19;      //使能串口4时钟
21   RCC->APB1ENR|=1<<18;      //使能串口3时钟
22   RCC->APB1ENR|=1<<17;      //使能串口2时钟
23
24   //DMA
25   RCC->AHB1ENR|=1<<21;//DMA1时钟使能
26   RCC->AHB1ENR|=1<<22;//DMA2时钟使能
27
28   RCC->APB1ENR|=1<<1;         //TIM3时钟使能
29   RCC->APB1ENR|=1<<2;         //TIM4时钟使能
30   RCC->APB2ENR|=1<<0;        //TIM1时钟使能
31   RCC->APB2ENR|=1<<1;        //TIM8时钟使能
32 }