STM32F7xx外设驱动5-uart（寄存器）

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//源文件   void UartGpioConfig() {     RCC->AHB1ENR |= (1<<3);    //使能GPIOD     RCC->APB1ENR |= (1<<18);   //使能USART3     RCC->APB2ENR |=         //PD8  TXD   GPIOD->MODER |=  (2<<16);  //复用模式   GPIOD->OSPEEDR |= (2<<16); //High speed     GPIOD->AFR[1] |= (7<<0);   //AF7     GPIOD->PUPDR |= (1<<8*2);           //PD9  RXD   GPIOD->MODER |=  (2<<18);  //复用模式   GPIOD->OSPEEDR |= (2<<18); //High speed     GPIOD->AFR[0] |= (7<<4);   //AF7     GPIOD->PUPDR |= (1<<9*2); }   void UartCoreConfig(uint32_t bound) {    USART3->BRR |= (54*1000000+bound/2)/bound;      USART3->CR1 = 0;      USART3->CR1 |= 0<<28; //设置 M1=0    USART3->CR1 |= 0<<12; //设置 M0=0&M1=0,选择 8 位字长    USART3->CR1 |= 0<<15; //设置 OVER8=0,16 倍过采样    USART3->CR1 |= 1<<3;  //串口发送使能      USART3->CR1 |= 1<<0;    //串口使能 }   void UartPhyConfig() {     UartGpioConfig();     UartCoreConfig(UartBaud);   }   void UartPhySendByte(uint8_t byte) {    USART3->TDR = byte;      while((USART3->ISR &(1<<6)) == 0); }   void UartPhySendString(uint8_t *str) {    while(*str)      {        UartPhySendByte(*str);          str++;      } }   //头文件 /*****************************Uart*************************************/ #define  UartBaud   115200   void UartPhyConfig(void); void UartPhySendByte(uint8_t byte); void UartPhySendString(uint8_t *str); /**********************************************************************/