BUTTON MODE EXTI

[Leo Leo]

Posted on December 08, 2016 at 09:42

Hi,

I'm trying to wake up my device from the sleep mode and i'm asking this question : 

What's the difference between BUTTON MODE EXTI and BUTTON MODE GPIO ? 

Thank you ! 

Have a nice day ! 

[Nesrine M_O]

Posted on December 08, 2016 at 12:17

Hi

Michel.Leo

‌,

• BUTTON_MODE_GPIO: Button will be used as simple IO

• BUTTON_MODE_EXTI: Button will be connected to EXTI line with interrupt generation capability

-Nesrine-

Ifmy suggestanswers your question, please mark it as correct.

[Leo Leo]

Posted on December 08, 2016 at 13:34

Thank you ! 

[Walid FTITI_O]

Posted on December 08, 2016 at 12:50

Hi

Michel.Leo

,

EXTI mode and GPIO mode are a software designationused in the driver to configure the GPIO pin in possible available mode :

BUTTON MODE GPIO : used to configure the IO in output mode (PP or OD) or in alternate function AF (PP or OD)

BUTTON MODE EXTI: used to configure the IO in interruptionsensitive mode ( in driver SYSCFG and EXTI register are configured )

IF this response is helpful , pushh correct buttom.

-Walid F-

[Leo Leo]

Posted on December 08, 2016 at 13:55

If I understand, when i push the button in the MODE EXTI, I generate an interruption.

So for exemple in the below code, normally if I'm in the sleep mode and I press on the user button, i should wake up the device from the sleep. But it doesn't work ... I do the following steps :

- I press the reset Button, - I press the user button to enter in the sleep mode (as it programmed in the main) - The LED4 is blinking. - I press the user button - The LED4 continues to blink. I think that normally I should wake up the device from the sleep mode and then go back to the main programm and on this main, the code should switch on the LED3...

/* Configure User Button */
 STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_EXTI);
/* Request to enter SLEEP mode */
 __WFI();
/* Initialize LED4 on STM32F0-Discovery board */
 STM_EVAL_LEDInit(LED4);
/* Infinite loop */
 while (1)
 {
 /* Toggle The LED4 */
 STM_EVAL_LEDToggle(LED4);
/* Inserted Delay */
 for(index = 0; index < 0x7FFFF; index++);
 }
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Here is the entire code :

void SleepMode_Measure(void)
{
 __IO uint32_t index = 0;
 GPIO_InitTypeDef GPIO_InitStructure;
/* Configure all GPIO as analog to reduce current consumption on non used IOs */
 /* Enable GPIOs clock */
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC |
 RCC_AHBPeriph_GPIOD | RCC_AHBPeriph_GPIOF , ENABLE);
 
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
 GPIO_Init(GPIOC, &GPIO_InitStructure);
 GPIO_Init(GPIOD, &GPIO_InitStructure);
 GPIO_Init(GPIOF, &GPIO_InitStructure);
 GPIO_Init(GPIOA, &GPIO_InitStructure); 
 GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Disable GPIOs clock */
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC |
 RCC_AHBPeriph_GPIOD | RCC_AHBPeriph_GPIOF, DISABLE);
/* Configure User Button */
 STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_EXTI);
/* Request to enter SLEEP mode */
 __WFI();
/* Initialize LED4 on STM32F0-Discovery board */
 STM_EVAL_LEDInit(LED4);
/* Infinite loop */
 while (1)
 {
 /* Toggle The LED4 */
 STM_EVAL_LEDToggle(LED4);
/* Inserted Delay */
 for(index = 0; index < 0x7FFFF; index++);
 }
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?
int main(void)
{
 /*!< At this stage the microcontroller clock setting is already configured, 
 this is done through SystemInit() function which is called from startup
 file (startup_stm32f0xx.s) before to branch to application main.
 To reconfigure the default setting of SystemInit() function, refer to
 system_stm32f0xx.c file
 */
 /* Configure User Button */
 STM_EVAL_PBInit(BUTTON_USER,BUTTON_MODE_GPIO);
 
 /* Loop while User button is maintained pressed */
 while(STM_EVAL_PBGetState(BUTTON_USER) != RESET)
 {
 }
 
 /* Enable PWR APB1 Clock */
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
 
 /* Allow access to Backup */
 PWR_BackupAccessCmd(ENABLE);
 
 /* Reset RTC Domain */
 RCC_BackupResetCmd(ENABLE);
 RCC_BackupResetCmd(DISABLE);
 
 /* Loop while User button is maintained pressed */
 while(STM_EVAL_PBGetState(BUTTON_USER) == RESET)
 {
 }
 /* Loop while User button is maintained pressed */
 while(STM_EVAL_PBGetState(BUTTON_USER) != RESET)
 {
 }
 
#if defined (SLEEP_MODE)
 /* Sleep Mode Entry 
 - System Running at PLL (48MHz)
 - Flash 3 wait state
 - Prefetch and Cache enabled
 - Code running from Internal FLASH
 - All peripherals disabled.
 - Wakeup using EXTI Line (User Button PA.00)
 */ 
 SleepMode_Measure();
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

[Nesrine M_O]

Posted on December 08, 2016 at 14:23

Hi

Michel.Leo

‌

I recommend you to start from the PWR examples under the

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32html

:

• STM32F0xx_StdPeriph_Lib_V1.5.0\Projects\STM32F0xx_StdPeriph_Examples\PWR\PWR_Standby: This example shows how to enter the system to STANDBY mode and wake-up from this mode either with the RESET or using RTC Alarm.

• STM32F0xx_StdPeriph_Lib_V1.5.0\Projects\STM32F0xx_StdPeriph_Examples\PWR\PWR_CurrentConsumption: This example shows how to configure the STM32F0xx system to measure different Low Power modes current consumption. The Low Power modes are:

- Sleep Mode

- STOP mode with RTC

- STANDBY mode without RTC

- STANDBY mode with RTC

-Nesrine-

Ifmy suggestanswers your question, please mark it as correct.