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AN3427 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN3427 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 52 page AN3427 Peripheral migration Doc ID 019001 Rev 1 9/52 3 Peripheral migration As shown in Table 2 on page 9, 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, DMA, 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 F2 series. All these modified peripherals in the F2 series are enhancements in performance and features designed to meet new market requirements and to fix some limitations present in the F1 series. 3.1 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 2 below gives a general overview of this classification: Table 2. STM32 peripheral compatibility analysis F1 versus F2 series Peripheral F1 series F2 series Compatibility Comments Pinout SW compatibility FSMC Yes Yes Same features Identical Full compatibility WWDG Yes Yes Same features NA Full compatibility IWDG Yes Yes Same features NA Full compatibility DBGMCU Yes Yes Same features NA Full compatibility CRC Yes Yes Same features NA Full compatibility EXTI Yes Yes Same features Identical Full compatibility CAN Yes Yes Same features Identical Full compatibility |
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