AN3422 datasheet(46/52 Pages) STMICROELECTRONICS

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Firmware migration using the library

AN3422

46/52

Doc ID 018976 Rev 2

In L1 series you have to update this code as follows:

/* Enable GPIOD's AHB interface clock */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOD, ENABLE);

/* Select USART2 I/Os mapping on PD5/6 pins [(USART2_TX,USART2_RX):(PD5,PD6)] */

/* Connect PD5 to USART2_Tx */

GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_USART2);

/* Connect PD6 to USART2_Rx*/

GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_USART2);

/* Configure USART2_Tx and USART2_Rx as alternate function */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_Init(GPIOD, &GPIO_InitStructure);

5.5

EXTI

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 */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_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 L1 series the configuration of the EXTI line source pin is performed in the SYSCFG

peripheral (instead of AFIO in F1 series). As result, the source code should be updated as

follows:

/* Enable GPIOA's AHB interface clock */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

/* Enable SYSCFG's APB interface clock */

RCC_APB2PeriphClockCmd(RCC_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 */

AN3422 Datasheet(PDF) 46 Page - STMicroelectronics

AN3422 Datasheet(HTML) 46 Page - STMicroelectronics

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