Simple GPIO interrupt is not working

[wochenendpost]

Posted on November 02, 2012 at 23:24

Hello,

I use this example code below to get an ISR from GPIO PA0. My hardware is the STM32L152 at board STM32L152D-EVAL.

(

http://www.st.com/internet/evalboard/product/2517jsp

)

So I have only one task and before I run in infinity loop, I initialise the push_button (

BUTTON_KEY

= pin PA0) with interrupt mode exti0.

Without pushing the button, I always run in the ISR again and again. Only if I push the button than does not enter the ISR more than one time.

Can anybody hint me what is my mistake please?

int
main(
void
)


{

/* Ensure that all 4 interrupt priority bits are used as the pre-emption


priority. */


NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);




/* Enable the SYSCFG module clock */


RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);




/* Create the led flash task, as described at the top of this file. */


xTaskCreate(hwCntrlTask, (
signed
char
*) 
''hw_cntrl''
, mainHW_CNTRL_TASK_STACK_SIZE,


NULL, mainHW_CNTRL_PRIORITY | portPRIVILEGE_BIT, &handleHwCntrlTask);




/* Start the scheduler. */


vTaskStartScheduler();


for
(;;);


return
0;


}














typedef
enum


{


BUTTON_MODE_GPIO = 0,


BUTTON_MODE_EXTI = 1


} ButtonMode_TypeDef;




typedef
enum


{


BUTTON_KEY = 0,


BUTTON_RIGHT = 1,


BUTTON_LEFT = 2,


BUTTON_UP = 3,


BUTTON_DOWN = 4,


BUTTON_SEL = 5


} Button_TypeDef;




#define BUTTONn 6


/* On STM32L152-EVAL board, the KEY button is connected to PA.00 and it can


be use as Wakeup pin button. */




/**


* @brief Key push-button


*/


#define KEY_BUTTON_PIN GPIO_Pin_0


#define KEY_BUTTON_GPIO_PORT GPIOA


#define KEY_BUTTON_GPIO_CLK RCC_AHBPeriph_GPIOA


#define KEY_BUTTON_EXTI_LINE EXTI_Line0


#define KEY_BUTTON_EXTI_PORT_SOURCE EXTI_PortSourceGPIOA


#define KEY_BUTTON_EXTI_PIN_SOURCE EXTI_PinSource0


#define KEY_BUTTON_EXTI_IRQn EXTI0_IRQn




/**


* @brief Joystick Right push-button


*/


#define RIGHT_BUTTON_PIN GPIO_Pin_11


#define RIGHT_BUTTON_GPIO_PORT GPIOE


#define RIGHT_BUTTON_GPIO_CLK RCC_AHBPeriph_GPIOE


#define RIGHT_BUTTON_EXTI_LINE EXTI_Line11


#define RIGHT_BUTTON_EXTI_PORT_SOURCE EXTI_PortSourceGPIOE


#define RIGHT_BUTTON_EXTI_PIN_SOURCE EXTI_PinSource11


#define RIGHT_BUTTON_EXTI_IRQn EXTI15_10_IRQn




/**


* @brief Joystick Left push-button


*/


#define LEFT_BUTTON_PIN GPIO_Pin_12


#define LEFT_BUTTON_GPIO_PORT GPIOE


#define LEFT_BUTTON_GPIO_CLK RCC_AHBPeriph_GPIOE


#define LEFT_BUTTON_EXTI_LINE EXTI_Line12


#define LEFT_BUTTON_EXTI_PORT_SOURCE EXTI_PortSourceGPIOE


#define LEFT_BUTTON_EXTI_PIN_SOURCE EXTI_PinSource12


#define LEFT_BUTTON_EXTI_IRQn EXTI15_10_IRQn




/**


* @brief Joystick Up push-button


*/


#define UP_BUTTON_PIN GPIO_Pin_9


#define UP_BUTTON_GPIO_PORT GPIOE


#define UP_BUTTON_GPIO_CLK RCC_AHBPeriph_GPIOE


#define UP_BUTTON_EXTI_LINE EXTI_Line9


#define UP_BUTTON_EXTI_PORT_SOURCE EXTI_PortSourceGPIOE


#define UP_BUTTON_EXTI_PIN_SOURCE EXTI_PinSource9


#define UP_BUTTON_EXTI_IRQn EXTI9_5_IRQn




/**


* @brief Joystick Down push-button


*/


#define DOWN_BUTTON_PIN GPIO_Pin_10


#define DOWN_BUTTON_GPIO_PORT GPIOE


#define DOWN_BUTTON_GPIO_CLK RCC_AHBPeriph_GPIOE


#define DOWN_BUTTON_EXTI_LINE EXTI_Line10


#define DOWN_BUTTON_EXTI_PORT_SOURCE EXTI_PortSourceGPIOE


#define DOWN_BUTTON_EXTI_PIN_SOURCE EXTI_PinSource10


#define DOWN_BUTTON_EXTI_IRQn EXTI15_10_IRQn




/**


* @brief Joystick Sel push-button


*/


#define SEL_BUTTON_PIN GPIO_Pin_8


#define SEL_BUTTON_GPIO_PORT GPIOE


#define SEL_BUTTON_GPIO_CLK RCC_AHBPeriph_GPIOE


#define SEL_BUTTON_EXTI_LINE EXTI_Line8


#define SEL_BUTTON_EXTI_PORT_SOURCE EXTI_PortSourceGPIOE


#define SEL_BUTTON_EXTI_PIN_SOURCE EXTI_PinSource8


#define SEL_BUTTON_EXTI_IRQn EXTI9_5_IRQn






const
uint32_t BUTTON_CLK[BUTTONn] = {KEY_BUTTON_GPIO_CLK, RIGHT_BUTTON_GPIO_CLK,


LEFT_BUTTON_GPIO_CLK, UP_BUTTON_GPIO_CLK,


DOWN_BUTTON_GPIO_CLK, SEL_BUTTON_GPIO_CLK};




const
uint16_t BUTTON_PIN[BUTTONn] = {KEY_BUTTON_PIN, RIGHT_BUTTON_PIN,


LEFT_BUTTON_PIN, UP_BUTTON_PIN,


DOWN_BUTTON_PIN, SEL_BUTTON_PIN};




GPIO_TypeDef* BUTTON_PORT[BUTTONn] = {KEY_BUTTON_GPIO_PORT, RIGHT_BUTTON_GPIO_PORT,


LEFT_BUTTON_GPIO_PORT, UP_BUTTON_GPIO_PORT,


DOWN_BUTTON_GPIO_PORT, SEL_BUTTON_GPIO_PORT};




const
uint16_t BUTTON_PORT_SOURCE[BUTTONn] = {KEY_BUTTON_EXTI_PORT_SOURCE,


RIGHT_BUTTON_EXTI_PORT_SOURCE,


LEFT_BUTTON_EXTI_PORT_SOURCE,


UP_BUTTON_EXTI_PORT_SOURCE,


DOWN_BUTTON_EXTI_PORT_SOURCE,


SEL_BUTTON_EXTI_PORT_SOURCE};




const
uint16_t BUTTON_PIN_SOURCE[BUTTONn] = {KEY_BUTTON_EXTI_PIN_SOURCE,


RIGHT_BUTTON_EXTI_PIN_SOURCE,


LEFT_BUTTON_EXTI_PIN_SOURCE,


UP_BUTTON_EXTI_PIN_SOURCE,


DOWN_BUTTON_EXTI_PIN_SOURCE,


SEL_BUTTON_EXTI_PIN_SOURCE};




const
uint16_t BUTTON_EXTI_LINE[BUTTONn] = {KEY_BUTTON_EXTI_LINE,


RIGHT_BUTTON_EXTI_LINE,


LEFT_BUTTON_EXTI_LINE,


UP_BUTTON_EXTI_LINE,


DOWN_BUTTON_EXTI_LINE,


SEL_BUTTON_EXTI_LINE};




const
uint16_t BUTTON_IRQn[BUTTONn] = {KEY_BUTTON_EXTI_IRQn, RIGHT_BUTTON_EXTI_IRQn,


LEFT_BUTTON_EXTI_IRQn, UP_BUTTON_EXTI_IRQn,


DOWN_BUTTON_EXTI_IRQn, SEL_BUTTON_EXTI_IRQn};








/**


* @brief Configures Button GPIO and EXTI Line.


* @param Button: Specifies the Button to be configured.


* This parameter can be one of following parameters:


* @arg BUTTON_KEY: Key Push Button


* @arg BUTTON_RIGHT: Joystick Right Push Button


* @arg BUTTON_LEFT: Joystick Left Push Button


* @arg BUTTON_UP: Joystick Up Push Button


* @arg BUTTON_DOWN: Joystick Down Push Button


* @arg BUTTON_SEL: Joystick Sel Push Button


* @param Button_Mode: Specifies Button mode.


* This parameter can be one of following parameters:


* @arg BUTTON_MODE_GPIO: Button will be used as simple IO


* @arg BUTTON_MODE_EXTI: Button will be connected to EXTI line with interrupt


* generation capability


* @retval None


*/


void
STM_EVAL_PBInit(Button_TypeDef Button, ButtonMode_TypeDef Button_Mode)


{


GPIO_InitTypeDef GPIO_InitStructure;


EXTI_InitTypeDef EXTI_InitStructure;


NVIC_InitTypeDef NVIC_InitStructure;




/* There is no Wakeup and Tamper buttons on STM32L152-EVAL. */




/* Enable the BUTTON Clock */


RCC_AHBPeriphClockCmd(BUTTON_CLK[Button], ENABLE);


RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);




/* Configure Button pin as input */


GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;


GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;


GPIO_InitStructure.GPIO_Pin = BUTTON_PIN[Button];


GPIO_Init(BUTTON_PORT[Button], &GPIO_InitStructure);




if
(Button_Mode == BUTTON_MODE_EXTI)


{


/* Connect Button EXTI Line to Button GPIO Pin */


SYSCFG_EXTILineConfig(BUTTON_PORT_SOURCE[Button], BUTTON_PIN_SOURCE[Button]);


/* Configure Button EXTI line */


EXTI_InitStructure.EXTI_Line = BUTTON_EXTI_LINE[Button];


EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;




if
(Button != BUTTON_KEY)


{


EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;


}


else


{


EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;


}


EXTI_InitStructure.EXTI_LineCmd = ENABLE;


EXTI_Init(&EXTI_InitStructure);
4
4
4
4
/* Enable and set Button EXTI Interrupt to the lowest priority */
4
4
NVIC_InitStructure.NVIC_IRQChannel = BUTTON_IRQn[Button];
4
4
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
4
4
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
4
4
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
4
4
4
4
NVIC_Init(&NVIC_InitStructure);
4
4
}
4
4
}
4
4
4
4
//! My task:
4
4
void
hwCntrlTask(
void
*pvParameters)
4
4
{ 
4
4
STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
4
4
while
(1)
4
4
{
4
4
vTaskDelay( 100 / portTICK_RATE_MS); 
//! block for 100 ms
4
4
}
4
4
}
4
4
4
4
void
EXTI0_IRQHandler(
void
)
4
4
{
4
4
//Check if EXTI_Line0 is asserted
4
4
if
(EXTI_GetITStatus(EXTI_Line0) != RESET)
4
4
{
4
4
}
4
4
//we need to clear line pending bit manually
4
4
EXTI_ClearITPendingBit(EXTI_Line0);
4
4
}