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How to Enable GPIO External Interrupts STM32F30x_StdPeriph_Driver

epalaima
Associate II
Posted on January 29, 2017 at 09:53

Hi I'm working on a project where I need to enable external GPIO interrupts on the STM32F303 discovery board. I've looked up several examples online, but can't seem to get in to work. I'm using theSTM32F30x_StdPeriph_Driver. I see in several examples that GPIO_MODE_IT_RISING is used as the GPIO pin mode for interrupts, but this is a HAL library thing and not present in the StdPeriph.

I am using EXTI_LINE12 with GPIO PB12 in input pullup mode with trigger on the rising edge, vector isEXTI15_10_IRQn. Please let me know if you see anything I am doing wrong, I am at a loss at this point. Code is included below, thanks!

Function where I instantiate GPIO and interrupt (called in main):

static void GPIO_InputInit(void){
 GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE);
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOD, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15 | GPIO_Pin_14;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
 //GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
 GPIO_Init(GPIOE, &GPIO_InitStructure);
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; //GPIO_Pin_12
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
 GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
 GPIO_Init(GPIOD, &GPIO_InitStructure);
EXTI_InitTypeDef EXTI_InitStruct;
 NVIC_InitTypeDef NVIC_InitStruct;
/* Tell system that you will use PB12 for EXTI_Line12 */
 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource12);
/* PB12 is connected to EXTI_Line12 */
 EXTI_InitStruct.EXTI_Line = EXTI_Line12;
 /* Enable interrupt */
 EXTI_InitStruct.EXTI_LineCmd = ENABLE;
 /* Interrupt mode */
 EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
 /* Triggers on rising and falling edge */
 EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising;
 /* Add to EXTI */
 EXTI_Init(&EXTI_InitStruct);
/* Add IRQ vector to NVIC */
 /* PB12 is connected to EXTI_Line12, which has EXTI15_10_IRQn vector */
 NVIC_InitStruct.NVIC_IRQChannel = EXTI15_10_IRQn;
 /* Set priority */
 NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
 /* Set sub priority */
 NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x01;
 /* Enable interrupt */
 NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
 /* Add to NVIC */
 NVIC_Init(&NVIC_InitStruct);
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Interrupt Function:

void EXTI15_10_IRQHandler(void) {
 interruptCounter++;
 interruptFlag = 1;
 if (EXTI_GetITStatus(EXTI_Line12) != RESET) {
 envStage = 1;
 EXTI_ClearITPendingBit(EXTI_Line12);
 }
}�?�?�?�?�?�?�?�?

#standard-peripheral #gpio #exti #interrupt #stm32f303
3 REPLIES 3
Nesrine M_O
Lead II
Posted on January 30, 2017 at 16:24

Hi

Palaima.Emmett

,

Have a look to this example :STM32F30x_DSP_StdPeriph_Lib_V1.2.3\Projects\STM32F30x_StdPeriph_Examples\EXTI\EXTI_Example

this projectshows how to configure external interrupt lines, 3 EXTI lines (EXTI5, EXTI6 and EXTI13) when using the STM32303C-EVALare configured to generate an interrupt on each falling or rising edge.

In the interrupt routine a led connected to a specific GPIO pin is toggled.

In this example:

- EXTI5 is mapped to PD5

- EXTI6 is mapped to PE6

- EXTI13 is mapped to PC13

-Nesrine-

Randy Nelson
Associate III
Posted on November 24, 2017 at 18:33

Hello,

Did you get interrupts working? I'm also trying to use the STD Periph lib in Keil but not having much success.

Randy

Posted on November 24, 2017 at 19:25

 ,

 ,

The code you posted was some odd register level stuff, not the Standard Peripheral Library (SPL)

Here a PB4 example in SPL. Make sure PB4 doesn't have any other connectivity on board that might interfere. Look at my accepted Best Answer:

https://community.st.com/s/feed/0D50X00009XkX90SAF

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