2017-01-27 04:40 AM
Hi, everyone! I am working on a NucleoF303K8. I am using the standard periph library. I am trying to use USART interrupt in my project, but being held by a problem. When I NVIC_Init() the USART interrupts, it hangs. When I comment out the NVIC_Init() call, It works. I am new in STM32 programming, so I don'thave much to find the cause. I have replaced the startup files, some from the cube libandsome from the std library, not work.When I use the CubeMX to generate the hold project, it work with the USART interrupts. Since some requirements are not fit with the HAL library, so I use the std library. The following is my code:
Hoping someone can give me a little help, thanks a lot!
int main(void)
{
board_init();
uint8_t c = 1;
while(1){
GPIO_SetBits(GPIOB,GPIO_Pin_3);
Delay_us(1000000);
//Serial_Write(&Serial2, c);
USART_SendData(USART2,c);
GPIO_ResetBits(GPIOB,GPIO_Pin_3);
Delay_us(1000000);
}
}
void board_init(){
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// UART Init
//fifo_queue_reset(&usart_rx_q[0],usart_rx_buf[0],USART_RX_BUFFER_SIZE);
//fifo_queue_reset(&usart_rx_q[1],usart_rx_buf[1],USART_RX_BUFFER_SIZE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource15, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_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(USART1,&USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART1, USART_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE);
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//USART_Init(USART2,&USART_InitStructure);
//USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART2, USART_IT_TC, ENABLE);
//NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
//NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
//NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
//NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//NVIC_Init(&NVIC_InitStructure);
//USART_Cmd(USART2, ENABLE);
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
SysTick_Config(SystemCoreClock/1000);
//NVIC_SetPriority (SysTick_IRQn, 0);
RCC_ClocksTypeDef clocks;
RCC_GetClocksFreq(&clocks);
usTicks = clocks.SYSCLK_Frequency / 1000000;
//Serial_Init(SERIAL0, &Serial1);
//Serial_Init(SERIAL1, &Serial2);
}
void USART1_IRQHandler(void){
if(USART_GetITStatus(USART1, USART_IT_ORE) != RESET){
USART_ClearFlag(USART1,USART_FLAG_ORE);
USART_ClearITPendingBit(USART1,USART_IT_ORE);
}
if(USART_GetITStatus(USART1, USART_IT_NE) != RESET){
USART_ClearFlag(USART1,USART_FLAG_NE);
USART_ClearITPendingBit(USART1,USART_IT_NE);
}
if(USART_GetITStatus(USART1, USART_IT_FE) != RESET){
USART_ClearFlag(USART1,USART_FLAG_FE);
USART_ClearITPendingBit(USART1,USART_IT_FE);
}
if(USART_GetITStatus(USART1, USART_IT_PE) != RESET){
USART_ClearFlag(USART1,USART_FLAG_PE);
USART_ClearITPendingBit(USART1,USART_IT_PE);
}
if(USART_GetITStatus(USART1, USART_IT_WU) != RESET){
USART_ClearFlag(USART1,USART_FLAG_WU);
USART_ClearITPendingBit(USART1,USART_IT_WU);
}
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){
GPIO_SetBits(GPIOB,GPIO_Pin_3);
USART_ReceiveData(USART1);
//fifo_queue_put(&usart_rx_q[0],USART_ReceiveData(USART1));
}
if(USART_GetITStatus(USART1, USART_IT_TC) != RESET){
//uint8_t c;
//if(fifo_queue_get(&usart_tx_q[0],&c)){
// USART_SendData(USART1,c);
//}
//else {
// fifo_queue_reset(&usart_tx_q[0],(void*)0,0);
//}
}
}
uint32_t Micros(void){
register uint32_t ms, cycle_cnt;
do {
ms = sysTickUptime;
cycle_cnt = SysTick->VAL;
__ASM('\tnop\n');
} while (ms != sysTickUptime);
return (ms * 1000) + (usTicks * 1000 - cycle_cnt) / usTicks;
}
void Delay_us(uint32_t us){
uint32_t now = Micros();
while (Micros() - now < us);
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Solved! Go to Solution.
2017-01-27 06:47 AM
Hi Clive, Thanks again. You give me the hint, and I solve the problem now. It is the TC interrupt hold the procudure, I find it by lighting up the led when it happens. Finally, I disable the TC interrupt when there is no more data to send. Thanks a lot.
2017-01-27 05:07 AM
You'd need to clear the TC flag in the IRQHandler
2017-01-27 06:36 AM
Hi Clive, Thanks for reply. I have updated the code as the following:
But it doesn't help......it still hangs when calling the NVIC_Init();
void USART1_IRQHandler(void){
if(USART_GetITStatus(USART1, USART_IT_ORE) != RESET){ USART_ClearFlag(USART1,USART_FLAG_ORE); USART_ClearITPendingBit(USART1,USART_IT_ORE); } if(USART_GetITStatus(USART1, USART_IT_NE) != RESET){ USART_ClearFlag(USART1,USART_FLAG_NE); USART_ClearITPendingBit(USART1,USART_IT_NE); } if(USART_GetITStatus(USART1, USART_IT_FE) != RESET){ USART_ClearFlag(USART1,USART_FLAG_FE); USART_ClearITPendingBit(USART1,USART_IT_FE); } if(USART_GetITStatus(USART1, USART_IT_PE) != RESET){ USART_ClearFlag(USART1,USART_FLAG_PE); USART_ClearITPendingBit(USART1,USART_IT_PE); } if(USART_GetITStatus(USART1, USART_IT_WU) != RESET){ USART_ClearFlag(USART1,USART_FLAG_WU); USART_ClearITPendingBit(USART1,USART_IT_WU); } if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){ GPIO_SetBits(GPIOB,GPIO_Pin_3); USART_ReceiveData(USART1); //fifo_queue_put(&usart_rx_q[0],USART_ReceiveData(USART1)); }if(USART_GetITStatus(USART1, USART_IT_TC) != RESET){
USART_ClearFlag(USART1,USART_FLAG_TC);// uint8_t c;// if(fifo_queue_get(&usart_tx_q[0],&c)){// USART_SendData(USART1,c);// }// else {// fifo_queue_reset(&usart_tx_q[0],(void*)0,0);// } }}2017-01-27 06:47 AM
Hi Clive, Thanks again. You give me the hint, and I solve the problem now. It is the TC interrupt hold the procudure, I find it by lighting up the led when it happens. Finally, I disable the TC interrupt when there is no more data to send. Thanks a lot.