AN3427 datasheet(29/52 Pages) STMICROELECTRONICS

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AN3427

Peripheral migration

Doc ID 019001 Rev 1

29/52

3.6

GPIO

The STM32 F2 GPIO peripheral embeds new features compared to F1 series, the main

ones are listed below:

●

GPIO mapped on AHB bus for better performance

●

I/O pin multiplexer and mapping: pins are connected to on-board peripherals/modules

through a multiplexer that allows only one peripheral alternate function (AF) to be

connected to an I/O pin at a time. In this way, there can be no conflict between

peripherals sharing the same I/O pin.

●

More possibilities and features for I/O configuration

The F2 GPIO peripheral is a new design and thus the architecture, features and registers

are different from the GPIO peripheral in the F1 series, i.e. any code on F1series using the

GPIO needs to be rewritten to run on F2 series.

For more information about STM32 F2’s GPIO programming and usage, please refer to

section "I/O pin multiplexer and mapping" in the GPIO chapter of STM32F2xx Reference

Manual (RM0033).

The table below presents the differences between GPIOs in the STM32 F1 series and

STM32 F2 series.

DMA2_Stream5

DMA2_Stream6

DMA2_Stream7

USART6

I2C3_EV

I2C3_ER

OTG_HS_EP1_OUT

OTG_HS_EP1_IN

OTG_HS_WKUP

OTG_HS

DCMI

CRYP

HASH_RNG

Depending on the product line used

Table 8.

Interrupt vector differences between STM32 F1 series and STM32 F2 series

Position

STM32 F1 series

STM32 F2 series

Color key:

= Different Interrupt vector

= Interrupt Vector name changed but F1 peripheral still mapped on the same Interrupt Vector

position in F2 series

= Feature not available (NA)

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