Posted on April 18, 2017 at 23:07Hi 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);
