Posted on November 22, 2015 at 21:54 hello,
I'm having a problem with the UART4 of the processor STM32F072CBT6 when the interrupt of the UART is enabled.
Lets me shot the code:
#include ''stm32f0xx.h''
#include ''stm32f0xx.h''
#include ''stm32f0xx_usart.h''
#include ''stm32f0xx_misc.h''
void initUSART(void);
void sendStringUart(char *data);
void sendCharUart(char data);
volatile char receiverBufferUart[256];
int possitionUart; //possition of next byte of receiveerBuffer
void initUSART(){
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART4, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_4);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_4);
/* Configure USART4 pins: Rx and Tx ----------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable USART4 IRQ */
NVIC_InitStructure.NVIC_IRQChannel = USART3_4_IRQn;//USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
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(USART4, &USART_InitStructure);
// Habilita a interrupcao
USART_ITConfig(USART4, USART_IT_RXNE, ENABLE);
USART_Cmd(USART4,ENABLE);
}
void sendCharUart(char data){
while (USART_GetFlagStatus(USART4, USART_FLAG_TXE) == RESET);
USART_SendData(USART4, data);
}
void sendStringUart(char *data){
int i=0;
for(;data[i] !=0 ;i++){
sendCharUart(data[i]);
}
}
void USART3_4_IRQHandler(void)
{
/* RXNE handler */
if(USART_GetITStatus(USART4, USART_IT_RXNE) != RESET)
{
receiverBufferUart[possitionUart] = USART_ReceiveData(USART4);
}
}
int main(void){
initUSART();
sendStringUart(''hello world\n'');
while(1);
return 0;
}
When I execute this code the processor broke in the function HardFault_Handler () at stm32f0xx_it.c:67 - I discovery it using the GDB. However when I comment the line USART_ITConfig(USART4, USART_IT_RXNE, ENABLE); it work very well, but without interrupt.
Anyone was this problem?
Is some bug of the processor? My code is wrong?
Sorry for my bad English.
Thanks
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