AN4088 datasheet(45/71 Pages) STMICROELECTRONICS

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AN4088

Firmware migration using the library

4.5

GPIO configuration update

This section explains how to update the configuration of the various GPIO modes when

porting the application code from STM32F1 series to STM32F0 series.

4.5.1

Output mode

The example below shows how to configure an I/O in output mode (for example to drive a

LED) in STM32F1 series:

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_xxMHz; /* 2, 10 or 50 MHz */

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOy, &GPIO_InitStructure);

In STM32F0 series, you have to update this code as follows:

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; /* Push-pull or open drain

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; /* None, Pull-up or pull-down

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_xxMHz; /* 10, 2 or 50MHz */

GPIO_Init(GPIOy, &GPIO_InitStructure);

4.5.2

Input mode

The example below shows how to configure an I/O in input mode (for example to be used as

an EXTI line) in STM32F1 series:

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOy, &GPIO_InitStructure);

In STM32F0 series, you have to update this code as follows:

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x;

void CRC_SetIDRegister(uint8_t CRC_IDValue);

uint8_t CRC_GetIDRegister(void);

Note:

(*) This function is only applicable for STM32F07x, STM32F04x and STM32F091 devices.

Table 22. STM32F10xx and STM32F0xx CRC driver API correspondence (continued)

STM32F10xx CRC driver API

STM32F0xx CRC driver API

Color key:

= New function

= Same function, but API was changed

= Function not available (NA)

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