AN3422 datasheet(12/52 Pages) STMICROELECTRONICS

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Peripheral migration

AN3422

12/52

Doc ID 018976 Rev 2

Peripheral migration

As shown in Table 3 on page 13, there are three categories of peripherals. The common

peripherals are supported with the dedicated firmware library without any modification,

except if the peripheral instance is no longer present, you can change the instance and of

course all the related features (clock configuration, pin configuration, interrupt/DMA

request).

The modified peripherals such as: FLASH, ADC, RCC, PWR, GPIO and RTC are different

from the F1 series ones and should be updated to take advantage of the enhancements and

the new features in L1 series.

All these modified peripherals in the L1 series are enhanced to obtain lower power

consumption, with features designed to meet new market requirements and to fix some

limitations present in the F1 series.

4.1

STM32 product cross-compatibility

The STM32 series embeds a set of peripherals which can be classed in three categories:

●

The first category is for the peripherals which are by definition common to all products.

Those peripherals are identical, so they have the same structure, registers and control

bits. There is no need to perform any firmware change to keep the same functionality at

the application level after migration. All the features and behavior remain the same.

●

The second category is for the peripherals which are shared by all products but have

only minor differences (in general to support new features), so migration from one

product to another is very easy and does not need any significant new development

effort.

●

The third category is for peripherals which have been considerably changed from one

product to another (new architecture, new features...). For this category of peripherals,

migration will require new development at application level.

Table 3 gives a general overview of this classification.

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