Peripheral migration

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Peripheral migration

As shown in Table 4, 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 ADC, RCC and RTC) are partially different from those of

the F0 series, and dedicated drivers are updated to take advantage of the enhancements

and the new features in the L0 series.

Most of the modified peripherals in the L0 series are enhanced to have smaller silicon print

with features designed to offer advanced high-end capabilities in economical end products,

and to fix some limitations present in the F0 series.

2.1

STM32 product cross-compatibility

STM32 microcontrollers embed a set of peripherals which can be classified in three

categories:

1.

The first category is for the peripherals that 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.

2.

The second category is that of peripherals shared by all products, but have minor

differences (in general to support new features). The migration from one product to

another is very easy and does not need any significant new development effort.

3.

The third category is for peripherals considerably different from one product to another

(new architecture, new features...). For this category of peripherals, the migration will

require a dedicated development at the application level.

Table 4 gives a general overview of this classification for the two STM32 series under

consideration.