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stm32u5

article 2025/3/15 17:20:02

//1 使能系统时钟

// 系统时钟初始化 - 不加入会报错可以尝试一下
void SystemInit(void)
{
//对地址 0xE000ED88 的内容进行修改:
//将0X3向左移动20位或上 0X3 向左移动22位
*(unsigned int*) 0xE000ED88|=((3UL << 20U)|(3UL << 22U));
}

int main()
{
   //GPIOC的RCC寄存器地址，将位2置为1，使能GPIOC的RCC时钟
   *(unsigned int*)0x56020C8C |=1<<2;
   //PC13，配置为通用输出模式，位27和26置为01
   *(unsigned int*)0x52020800 &=~(1<<27);
   *(unsigned int*)0x52020800 |=1<<26;
//GPIO_OTYPER寄存器位13写入0
   *(unsigned int*) (0x52020800+0x04) &=~(1<<13);
//GPIO_OSPEEDR位27和位26写入00
   *(unsigned int*) (0x52020800+0x08) &=~(1<<27);
   *(unsigned int*) (0x52020800+0x08) &=~(1<<26);
//GPIO_ODR寄存器位13写入1 高电平
   *(unsigned int*) (0x52020800+0x14) |=(1<<13);

   //PC06,配置为通用输出模式.位13和位12置为01
   *(unsigned int*)0x52020800 &=~(1<<13);
   *(unsigned int*)0x52020800 |=1<<12;
   //GPIO_OTYPER寄存器位06写入0
   *(unsigned int*) (0x52020800+0x04) &=~(1<<6);
   //GPIO_OSPEEDR位13和位12写入00
   *(unsigned int*) (0x52020800+0x08) &=~(1<<13);
   *(unsigned int*) (0x52020800+0x08) &=~(1<<12);
   //GPIO_ODR寄存器位13写入1 高电平
   *(unsigned int*) (0x52020800+0x14) |=(1<<6);


   //GPIOC的RCC寄存器地址，将位2置为1，使能GPIOC的RCC时钟
   *(unsigned int*)0x56020C8C |=1;
   //PA15，配置为通用输出模式，位31和30置为01
   *(unsigned int*)0x52020000 &=~(1<<31);
   *(unsigned int*)0x52020000 |=1<<30;
   //GPIO_OTYPER寄存器位15写入0
   *(unsigned int*) (0x52020000+0x04) &=~(1<<15);
       //GPIO_OSPEEDR位31和位30写入00
   *(unsigned int*) (0x52020000+0x08) &=~(1<<31);
   *(unsigned int*) (0x52020000+0x08) &=~(1<<30);
   //GPIO_ODR寄存器位15写入1 高电平
   *(unsigned int*) (0x52020000+0x14) |=(1<<15);
   return 0;
}
//2 使能GPIO总线上的时钟
//3 配置GPIO相关的寄存器