Interrupt problem and UART problem

[randyao12345]

Posted on December 05, 2014 at 03:03

Hi ST forum,

I have two separate problems: 1. How do I configure an interrupt to do X on rising edge and Y on falling edge? Currently, I can only do rising edge: (Solved, see below)/*********************************************************************************************************** Function name:           EXTI_PA0_Config** Descriptions:            Configures interrupt for PA0** Parameters: None*********************************************************************************************************/void EXTI_PA0_Config(void){ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); GPIO_main.GPIO_Mode = GPIO_Mode_IN; GPIO_main.GPIO_Speed = GPIO_Speed_25MHz; GPIO_main.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_main.GPIO_Pin = GPIO_Pin_0; //Output PA0 GPIO_Init(GPIOA,&GPIO_main); EXTI_main.EXTI_Line = EXTI_Line0; EXTI_main.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_main.EXTI_Trigger = EXTI_Trigger_Rising; //need raising falling EXTI_main.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_main); SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0); NVIC_main.NVIC_IRQChannel = EXTI0_IRQn; //connect EXTI to line 0 NVIC_main.NVIC_IRQChannelPreemptionPriority = 0x01;  //set both preemptive priority and sub-priority to lowest NVIC_main.NVIC_IRQChannelSubPriority = 0x01; NVIC_main.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_main);}void EXTI0_IRQHandler(void){    NVIC_ClearPendingIRQ(EXTI0_IRQn);    if(flag==0)    {    flag=1;    }    else if(flag==1)    {    flag=0;    }    EXTI->PR|=(1<<0); //write 1 to PR to clear - write 1 at bit 0?}Problem 2: I want to be able to receive UART. Currently I can only transmit UART. (Partially solved with bugs, see below)/*********************************************************************************************************** Function name:           UART1_Init** Descriptions:            Initializes UART2_TX at PA2** Parameters: None*********************************************************************************************************/void UART1_Init(void){    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);    GPIO_main.GPIO_Pin = GPIO_Pin_2; GPIO_main.GPIO_Mode = GPIO_Mode_AF; GPIO_main.GPIO_PuPd = GPIO_PuPd_UP; GPIO_main.GPIO_Speed = GPIO_Speed_50MHz; GPIO_main.GPIO_OType = GPIO_OType_PP; GPIO_Init(GPIOA, &GPIO_main); GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); USART_main.USART_Mode = USART_Mode_Tx; //Transmit Mode, Receiver mode not currently required USART_main.USART_BaudRate = 115200; //This is right USART_main.USART_WordLength = USART_WordLength_8b; //8 bit data transmit USART_main.USART_Parity = USART_Parity_No; // USART_main.USART_StopBits = USART_StopBits_1; // 1 stop bit USART_main.USART_HardwareFlowControl =     USART_HardwareFlowControl_None; USART_Init(USART2,&USART_main);        USART_Cmd(USART2,ENABLE);}

[randyao12345]

Posted on December 12, 2014 at 19:10

I got the interrupt problem solved by doing this (after entering interrupt, check for port level).

void EXTI9_5_IRQHandler(void){ if (EXTI_GetITStatus(EXTI_Line5) != RESET) //Filter line 5 {    EXTI_ClearITPendingBit(EXTI_Line5);    if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_5))    {     GPIOD->BSRRL = GPIO_Pin_12; //test and debug only     flag = 1;    }    else if(!GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_5))    {     GPIOD->BSRRH = GPIO_Pin_12; //test and debug only     flag = 0;    }//    UART1_Send(Message_StopMotor,5); }}For the UART, I'm stuck on this problem: I'm doing a loopback test, but valid data only displays 3500 baud or below. Over 4000 it displays some nonsense..Here's my codes:void UART1_Init(void){    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);    GPIO_main.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_main.GPIO_Mode = GPIO_Mode_AF;// GPIO_main.GPIO_PuPd = GPIO_PuPd_UP; GPIO_main.GPIO_Speed = GPIO_Speed_50MHz;// GPIO_main.GPIO_OType = GPIO_OType_PP; GPIO_Init(GPIOA, &GPIO_main); GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); USART_main.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //Transmit Mode, Receiver mode not currently required USART_main.USART_BaudRate = 3500; //Current baud rate 115200 bit/s USART_main.USART_WordLength = USART_WordLength_8b; //8 bit data transmit USART_main.USART_Parity = USART_Parity_No; //No parity bits USART_main.USART_StopBits = USART_StopBits_1; // 1 stop bit USART_main.USART_HardwareFlowControl = USART_HardwareFlowControl_None;// USART_Init(USART1,&USART_main);//  USART_Cmd(USART1,ENABLE);    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //enables USART_Init(USART1,&USART_main); USART_Cmd(USART1, ENABLE);    NVIC_main.NVIC_IRQChannel = USART1_IRQn;        // we want to configure the USART1 interrupts    NVIC_main.NVIC_IRQChannelPreemptionPriority = 0;         // this sets the priority group of the USART1 interrupts    NVIC_main.NVIC_IRQChannelSubPriority = 0; // this sets the subpriority inside the group    NVIC_main.NVIC_IRQChannelCmd = ENABLE; // the USART1 interrupts are globally enabled NVIC_Init(&NVIC_main);        // the properties are passed to the NVIC_Init function which takes care of the low level stuff}void USART1_IRQHandler(void){ if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {// USART_ClearITPendingBit(USART1, USART_IT_RXNE);// rx[rx_index] = USART_ReceiveData(USART1); rx[rx_index] = USART1->DR; if(rx_index>9) { rx_index = 0; } rx_index++; }}in main:int main(void){ LED_Init(); //Initializes LED outputs UART1_Init(); //Initializes UART1 at PA9 EXTI_PB5_Config(); //Configures interrupt for PB5 int k = 0; UART1_Send(Message_SetSpeed,7);    while(1)    {    for(k=0;k<rx_index;k++)    {    printf(''\n%d: %X'',k,rx[k]);    }    }}(Set speed was defined as: uint8_t Message_SetSpeed[6] = {0x01,0xA1,0x9C,0x40,0x82,0x04}; //Speed set at 4000RPM)

[Tesla DeLorean]

Posted on December 12, 2014 at 21:21

What board are you doing this on? The STM32F4-DISCO has a huge bulk capacitor hung off the USART1 pins, which is going to limit it's rate/usability.

[randyao12345]

Posted on December 12, 2014 at 22:25

I am using the discovery board. Maybe that is the problem? Thus switching to USART2/3 would solve the problem?