AN4228 datasheet(44/90 Pages) STMICROELECTRONICS

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Firmware migration using the library

AN4228

44/90

DocID024110 Rev 5

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

4.6

EXTI Line0

The example below shows how to configure the PA0 pin to be used as EXTI Line0 in

STM32F1 series:

/* Enable APB interface clock for GPIOA and AFIO */

_APB2PeriphClockCmd(_APB2Periph_GPIOA | _APB2Periph_AFIO, ENABLE);

/* Configure PA0 pin in input mode */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Connect EXTI Line0 to PA0 pin */

GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

/* Configure EXTI line0 */

EXTI_InitStructure.EXTI_Line = EXTI_Line0;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

In STM32F3 series, the configuration of the EXTI line source pin is performed in the

SYSCFG peripheral (instead of AFIO in STM32F1 series). As a result, the source code

should be updated as follows:

/* Enable GPIOA's AHB interface clock */

_AHBPeriphClockCmd(_AHBPeriph_GPIOA, ENABLE);

/* Enable SYSCFG's APB interface clock */

_APB2PeriphClockCmd(_APB2Periph_SYSCFG, ENABLE);

/* Configure PA0 pin in input mode */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Connect EXTI Line0 to PA0 pin */

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

/* Configure EXTI line0 */

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