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Hard Fault When I enable the USART3_8_IRQn interrupt.

Question asked by carter.bob on Apr 18, 2017
Latest reply on Apr 19, 2017 by carter.bob

Hi Forum,

I'm using the stm32f091, but when I enable the USART3 interrupt, the system hard faults. I already use USARTS1 and 2 without any problem. Not sure what else is required, so I'd be grateful for some assistance. One thing I;d like to know is  how do you distinguish between interrupts from USARTS3 up to USART8.

 

Kind Regards

Bob

 

  USART_InitTypeDef USART_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

 


  // Enable GPIOC clock
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
 
  // Enable USART3 APB clock
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
    
 
  // Connect pin to Periph
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_1);   //  USART3 TX
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_1);   //  USART3 RX
 
  // Configure pins as AF pushpull
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
      
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART3, &USART_InitStructure);
    
  USART_Cmd(USART3, ENABLE);
      
//  Enable the COM3 Receive interrupt: this interrupt is generated when the
//  COM3 receive data register is not empty
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

 

  // USART3 IRQ Channel configuration
  NVIC_InitStructure.NVIC_IRQChannel = USART3_8_IRQn;   

  NVIC_InitStructure.NVIC_IRQChannelPriority = 1;


  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

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