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среда, 27 ноября 2013 г.

Конфигурирование USART

int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f0xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f0xx.c file
     */
  Configure_GPIO_LED();
  Configure_GPIO_USART1();
  Configure_USART1();
  Configure_GPIO_Button();
  Configure_EXTI();
  /* Start transmission in button IRQ handler */
  /* Infinite loop */
  while (1)
  {
  }
}
/**
  * @brief  This function :
             - Enables GPIO clock
             - Configures the Green LED pin on GPIO PC9
             - Configures the Orange LED pin on GPIO PC8
  * @param  None
  * @retval None
  */
__INLINE void Configure_GPIO_LED(void)
{
  /* Enable the peripheral clock of GPIOC */
  RCC->AHBENR |= RCC_AHBENR_GPIOCEN;
  /* Select output mode (01) on PC8 and PC9 */
  GPIOC->MODER = (GPIOC->MODER & ~(GPIO_MODER_MODER8 | GPIO_MODER_MODER9)) \
                 | (GPIO_MODER_MODER8_0 | GPIO_MODER_MODER9_0);
}
/**
  * @brief  This function :
             - Enables GPIO clock
             - Configures the USART1 pins on GPIO PB6 PB7
  * @param  None
  * @retval None
  */
__INLINE void Configure_GPIO_USART1(void)
{
  /* Enable the peripheral clock of GPIOA */
  RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
  /* GPIO configuration for USART1 signals */
  /* (1) Select AF mode (10) on PA9 and PA10 */
  /* (2) AF1 for USART1 signals */
  GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER9|GPIO_MODER_MODER10))\
                 | (GPIO_MODER_MODER9_1 | GPIO_MODER_MODER10_1); /* (1) */
  GPIOA->AFR[1] = (GPIOA->AFR[1] &~ (GPIO_AFRH_AFRH1 | GPIO_AFRH_AFRH2))\
                  | (1 << (1 * 4)) | (1 << (2 * 4)); /* (2) */
}
/**
  * @brief  This function configures USART1.
  * @param  None
  * @retval None
  */
__INLINE void Configure_USART1(void)
{
  /* Enable the peripheral clock USART1 */
  RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
  /* Configure USART1 */
  /* (1) oversampling by 16, 9600 baud */
  /* (2) 8 data bit, 1 start bit, 1 stop bit, no parity */
  USART1->BRR = 480000 / 96; /* (1) */
  USART1->CR1 = USART_CR1_TE | USART_CR1_UE; /* (2) */
  /* polling idle frame Transmission */
  while((USART1->ISR & USART_ISR_TC) != USART_ISR_TC)
  {
    /* add time out here for a robust application */
  }
  USART1->ICR |= USART_ICR_TCCF;/* clear TC flag */
  USART1->CR1 |= USART_CR1_TCIE;/* enable TC interrupt */
  /* Configure IT */
  /* (3) Set priority for USART1_IRQn */
  /* (4) Enable USART1_IRQn */
  NVIC_SetPriority(USART1_IRQn, 0); /* (3) */
  NVIC_EnableIRQ(USART1_IRQn); /* (4) */
}

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