ST AN3364 Application note

AN3364

Application note

Migration and compatibility guidelines for

STM32 microcontroller applications

Introduction

For designers of STM32 microcontroller applications, it is important to be able to easily replace one microcontroller type by another one in the same product series. Migrating an application to a different microcontroller is often needed, when product requirements grow, putting extra demands on memory size, or increasing the number of I/Os. On the other hand, cost reduction objectives may force you to switch to smaller components and shrink the PCB area. This application note is written to help you and analyze the steps you need to migrate from an existing STM32-based design to any one of the other microcontroller types in the fast-growing STM32 series.

To save your time, this application note groups together all the most important information and lists the vital aspects that you need to address.

All the information included here can also be extremely worthwhile in your first STM32 design, not immediately concerned by a migration project. Studying the issues now will help you tackle any future requirement by designing for compatibility from the beginning. To use this application note, general STM32 knowledge is required, you can learn it from the STM32 series reference manual, the STM32 datasheets, and the STM32 Flash program memory programming manuals.

This application note presents an overview of the whole STM32 series and presents a first level view of the different aspects that are important to consider when planning a new design or migrating. The microcontroller blocks and peripherals are grouped and identified either as fully compatible or compatible with enhancements, or presented by types of series.

However the details of the migration guidelines across STM32 series are documented in separate documents. Please refer to one of the following documents:

● AN3427 Migrating applications from STM32F1 series to STM32F2 series.

● AN3422 Migrating applications from STM32F1 series to STM32L1 series.

● AN4088 Migrating applications from STM32F1 series to STM32F0 series.

Table 1. Applicable products

Typ e Part nu mbers

Microcontrollers STM32F0, STM32F1, STM32F2, STM32F4 and STM32L1 series

May 2012 Doc ID 018608 Rev 3 1/17

www.st.com

Contents AN3364

Contents

1 How to migrate across STM32 series . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 STM32 series general overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1.1 STM32 product series feature comparison . . . . . . . . . . . . . . . . . . . . . . . 6

1.1.2 STM32 product cross-compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.2 Software migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17 Doc ID 018608 Rev 3

AN3364 List of tables

List of tables

Table 1. STM32 series overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. STM32 peripheral compatibility analysis F1 versus F0 series . . . . . . . . . . . . . . . . . . . . . . . 9

Table 3. STM32 peripheral compatibility analysis F1 versus F2 series . . . . . . . . . . . . . . . . . . . . . . 11

Table 4. STM32 peripheral compatibility analysis F1 versus F4 series . . . . . . . . . . . . . . . . . . . . . . 12

Table 5. STM32 peripheral compatibility analysis F1 versus L1 series . . . . . . . . . . . . . . . . . . . . . . 14

Table 6. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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How to migrate across STM32 series AN3364

1 How to migrate across STM32 series

1.1 STM32 series general overview

The STM32 platform forms a strong foundation with a broad and growing portfolio. With new products addressing new applications, the complete STM32 product series now comprises several series including STM32F0, STM32F1, STM32F2, STM32F4 and STM32L1, each dedicated to a specific segment:

● STM32F0: The F0 series bridges the gap with applications using 8- and 16-bit

microcontrollers, enabling advanced high-end features in economical end products. The F0 series offers unparalleled flexibility and scalability for home-entertainment products, appliances, and industrial equipment.

● STM32F1: The general-purpose F1 series addresses a wide range of applications,

from the lowest, price-sensitive designs to computing-intensive, high memory footprint ones. The F1 series is a complete series whose members are fully pin-to-pin, software and feature compatible.

– Low density devices are STM32F101xx and STM32F103xx microcontrollers

where the Flash memory density ranges between 16 and 32 Kbytes.

– Medium density devices are STM32F101xx and STM32F103xx microcontrollers

where the Flash memory density ranges between 32 and 128 Kbytes.

– High density devices are STM32F101xx and STM32F103xx microcontrollers

where the Flash memory density ranges between 256 and 512 Kbytes.

– XL density devices are STM32F101xx and STM32F103xx microcontrollers where

the Flash memory density ranges between 768 Kbytes and 1024 Kbytes.

– Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers

where the Flash memory density ranges between 64 and 256 Kbytes.

– Medium density value line devices are STM32F100xx microcontrollers where

the Flash memory density ranges between 64 and 128 Kbytes.

– High density value line devices are STM32F100xx microcontrollers where the

Flash memory density ranges between 128 and 512 Kbytes.

● STM32F2: The F2 series provides the highest performance for computing-intensive

applications and advanced connectivity. The F2 series maintains compatibility with the F1 series.

● STM32F4: The ARM® Cortex™-M4-based F4 series is an extension of the industry-

leading STM32 portfolio towards even higher performance. Like the STM32 F2 series, these MCUs leverage ST‘s 90 nm NVM technology and ST’s ART Accelerator™ to reach the industry’s highest benchmark scores for Cortex-M-based microcontrollers with 210 DMIPS/469 Coremark executing from Flash memory at 168 MHz operating frequency.

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AN3364 How to migrate across STM32 series

● STM32L1: Designed for ultra-low-power applications that are energy-aware and seek

to achieve the absolute lowest power consumption. The L1 series maintains compatibility with the F1 series.

– Medium density devices are STM32L151xx and STM32L152xx microcontrollers

where the Flash memory density ranges between 64 and 128 Kbytes.

– Medium+ density devices are STM32L151xx, STM32L152xx and STM32L162xx

microcontrollers where the Flash memory density is 256 Kbytes.

– High density devices are STM32L151xx, STM32L152xx and STM32L162xx

microcontrollers where the Flash memory density is 384 Kbytes.

In the rest of this document (unless otherwise specified),

– the terms F0, STM32F0 and STM32F0xx are used to refer to the STM32F0 series

– the terms F1, STM32F1 and STM32F10x are used to refer to the STM32F1 series

– the terms F2, STM32F2 and STM32F2xx are used to refer to the STM32F2 series

– the terms F4, STM32F4 and STM32F4xx are used to refer to the STM32F4 series

– the terms L1, STM32L1 and STM32L1xx are used to refer to the STM32L1 series

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How to migrate across STM32 series AN3364

1.1.1 STM32 product series feature comparison

Table 1. STM32 series overview

STM32 series

Peripheral

F1 L1 F2 F0 F4

Cortex-M3 r1p1

Core

FLASH memory

SRAM

FSMC Ye s N o Ye s N o Ye s

Max CPU frequency

Operating voltage 2.0 to 3.6 V 1.65 to 3.6 V 1.8 to 3.6 V 2.0 to 3.6 V 1.8 to 3.6 V

Bootloader

Advanced 4 channel (3 cmpl. out)

General purpose

MPU in XL-density only

16 / 32 / 64 / 128 / 256 / 384 / 512 / 768KB - 1 MB

6 / 10 / 20 / 24 / 32 / 48 / 64 / 96 KB

24 / 36 / 48 / 72 MHz depending on the product line used

Connectivity Line: USART1/2, CAN2, DFU (OTG FS Device)

Other product lines:USART1

up to 2 No 2 1 2

up to 10 7 up to 10

Cortex-M3 r2p0 w/ MPU

64/128 KB

10/16 KB 64/96/128 KB 8 KB 128 + 64 KB

32 MHz 120 MHz 48 MHz 168 MHz

Medium density: USART1/2

Medium+ and High density: USART1/2 + DFU (USB Device FS)

Cortex-M3 r2p0 w/ MPU

128 / 256 / 512 / 786 / 1024 KB

USART1/3, CAN2, DFU (OTG FS Device)

Cortex-M0

64 KB 512 / 1024 KB

USART1/2

5 (16-bit) 1 (32-bit)

Cortex-M4 r0p1 w/ FPU and MPU

USART1/3, CAN2, DFU (OTG FS Device)

Timers

RTC Counter

6/17 Doc ID 018608 Rev 3

4 channels up to 4 4 up to 4 2 4

2 channels up to 2 1 up to 2

1 channel up to 4 2 up to 4

Basics up to 2 2 2 1 2

Hardware calendar

1(w/ 1Cmpl out)

1 + 2(w/ 1compl out)

Hardware calendar + subseconds

AN3364 How to migrate across STM32 series

Table 1. STM32 series overview (continued)

STM32 series

Peripheral

F1 L1 F2 F0 F4

SPI(I2S) up to 3(2) 2 3(2) 2(1) 3(2)

TI mode No No Yes Yes Yes

Max freq. up to 18 Mbits/s

up to16 Mbits/s

up to 15 or 30 Mbits/s

up to 18 Mbits/s

up to 37.5 Mbits/s

Audio freq. 8 kHz up to 96 kHz No

I2C up to 2 2 3 2 2

Max freq. 400 kHz 400 kHz 400 kHz 1Mbit/s 400 kHz

USART up to 3 3 4 2 4

COMs

GPIOs 26/37/51/80/112 37/51/83 51/82/114/140 27/39/55 up to 140

12-bit ADC up to 3 1 3 1 3

UART up to 2 No 2 - 2

Max freq. 2.25 or 4.5 Mbit/s up to 4 Mbit/s

USB

CAN up to 2 No 2 No 2

SDIO 1 No 1 No 1

CEC up to 1 No No 1 No

Ethernet MAC

Max sampling freq. 1 MSPS 1 MSPS 2 MSPS 1 MSPS 2.4 MSPS

USB Device FS OTG FS

Yes w/ HW IEEE 1588 v1

USB Device FS

8 kHz up to 192 kHz

3.75 or 7.5 Mbit/s

OTG FS OTG HS

Yes w/ HW IEEE1588 v2

8 kHz to 192 kHz

6 Mbit/s 10.5 Mbit/s

No No

8 kHz to 192 kHz

OTG FS OTG HS

Yes w/ HW IEEE1588 v2

Number of channels

12-bit DAC 22212

Max sampling freq. 1 MS/s 1 MS/s 1 MS/s 1 MS/s 1 MS/s

Number of channels

Comparators No 2 No 2 No

LCD (COM x SEG) No 4x44/ 8x40 No No No

DCMI No No Yes No Yes

Crypto/hash processor

10/16/21 channels

22212

No No

16/20/24 channels

Doc ID 018608 Rev 3 7/17

16/24 channels

Ye s DES, 3DES,

AES 256-bit, SHA-1, MD5, HMAC

16+3 channels

up to 24 channels

Ye s DES, 3DES, AES

256-bit, SHA-1, MD5, HMAC

How to migrate across STM32 series AN3364

Table 1. STM32 series overview (continued)

STM32 series

Peripheral

F1 L1 F2 F0 F4

RNG No No Yes No Yes

UFQFPN32

VFQFPN36

LQFP48 LQFP48 LQFP48

VFQFPN48 VFQFN48

LQFP64 LQFP64 LQFP64 LQFP64 LQFP64

BGA64

WLCSP64 WLCSP64

Package

TFBGA64

WLCSP90

LQFP100 LQFP100 LQFP100 LQFP100

BGA100 BGA100

LFBGA100

LQFP144 LQFP144 LQFP144

BGA144

UFBGA176 UFBGA176

LQFP176

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AN3364 How to migrate across STM32 series

1.1.2 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.

Ta bl e 2 through toTa bl e 5 gives a general overview of this classification:

Table 2. STM32 peripheral compatibility analysis F1 versus F0 series

Peripheral

SPI Ye s

WWDG Yes Yes Same features NA Full compatibility

IWDG / IWWDG

DBGMCU Ye s Ye s

CRC Ye s

EXTI Ye s Ye s +

CEC Ye s

DMA Ye s Ye s

Series Compatibility

F1 F0 Comments Pinout SW compatibility

Two FIFO available, 4 bit to 16 bit data size selection

No JTAG, No Trace

Added reverse capability and initial CRC value

Some peripherals are able to generate event in stop mode

Kernel clock, arbitration lost flag and automatic transmission retry, multi-address config, wake up from stop mode

1 DMA controller with 5 channels

Identical

Identical for the SWD

NA Partial compatibility

Identical Full compatibility

Identical

NA Full compatibility

Partial compatibility

Ye s

Ye s +

Ye s + + Added a Window mode NA Partial compatibility

Ye s +

Ye s + +

TIM Ye s Ye s + Enhancement Identical Full compatibility

PWR Ye s Ye s +

RCC Ye s Ye s + New HSI14 dedicated to ADC

No Vref, Vdda can be greater than Vdd, 1.8 mode for core.

Doc ID 018608 Rev 3 9/17

Identical for the same feature

PD0 & PD1 => PF0 & PF1 for the osc

Partial compatibility

How to migrate across STM32 series AN3364

Color key:

= New feature or new architecture (Yes++)

= Same feature, but specification change or enhancement (Yes+)

= Feature not available (NA)

Table 2. STM32 peripheral compatibility analysis F1 versus F0 series (continued)

Series Compatibility

Peripheral

F1 F0 Comments Pinout SW compatibility

Choice for independant clock

USART Ye s Ye s +

sources, Time out feature, wake up from stop mode

Identical Full compatibility

I2C Ye s

DAC Ye s

ADC Ye s Ye s + +

RTC Ye s

FLASH Ye s

GPIO Ye s

CAN Ye s

USB FS device

Ethernet Ye s

SDIO Ye s

FSMC Ye s

Touch sensing

Ye s

NA Yes NA NA NA

Ye s + +

Ye s + DMA underrun interrupt Identical Full compatibility

Ye s + +

Ye s + Option byte modified NA Partial compatibility

Ye s + + New peripheral 4 new GPIOs Partial compatibility

NA NA NA NA

Bug fix, FM+, wake up from stop mode, Digital filter

Same analogic part, but new digital interface

Subsecond precision, digital calibration circuit, Time-stamp function for event saving, programmable alarm

Identical Full compatibility

Identical

Identical for the same feature

Partial compatibility

New driver

COMP

SYSCFG

10/17 Doc ID 018608 Rev 3

NA Yes NA NA NA

AN3364 How to migrate across STM32 series

Table 3. STM32 peripheral compatibility analysis F1 versus F2 series

Compatibility

Peripheral F1 series F2 series

Comments Pinout SW compatibility

FSMC Yes Yes Same features Identical Full compatibility

WWDG

IWDG

DBGMCU

CRC

EXTI

CAN

PWR Ye s Ye s + Enhancement NA

RCC

SPI Ye s Ye s + TI mode / Max baudrate Identical

USART

I2C

Ye s Yes Same features NA Full compatibility

Ye s Yes Same features Identical Full compatibility

Full compatibility for the same feature

Ye s Ye s + Enhancement NA Partial compatibility

Full compatibility for the same feature

Limitation fix / Max baudrate /

Ye s Ye s +

One Sample Bit / Oversampling

Identical

by 8

Ye s Ye s + Limitation fix Identical

Full compatibility for the same feature

TIM

Ye s Ye s +

32-bit Counter in TIM2 and TIM5

Identical

DAC Ye s Ye s + DMA underrun interrupt Identical

Ethernet

SDIO

Ye s Ye s +

Ye s Ye s + Limitation fix Identical

IEEE1588 v2 / Enhanced DMA descriptor

Identical

Full compatibility for the same feature

- Dynamic trimming capability of

USB OTG FS

Ye s Ye s +

SOF framing period in Host mode

- Embeds a VBUS sensing

Identical

Full compatibility for the same feature

control

RTC

ADC

Ye s Ye s + + New peripheral

Identical for the same feature

Not compatible

Partial compatibility

FLASH Ye s Ye s + + New peripheral NA Not compatible

DMA

Ye s Ye s + + New peripheral NA Not compatible

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How to migrate across STM32 series AN3364

Color key:

= New feature or new architecture (Yes++)

= Same feature, but specification change or enhancement (Yes+)

= Feature not available (NA)

Table 3. STM32 peripheral compatibility analysis F1 versus F2 series (continued)

Compatibility

Peripheral F1 series F2 series

Comments Pinout SW compatibility

GPIO Ye s Ye s + + New peripheral Identical Not compatible

CEC

USB FS Device

Crypto/hash processor

RNG

DCMI

USB OTG HS

SYSCFG

Table 4. STM32 peripheral compatibility analysis F1 versus F4 series

Ye s NA NA NA NA

NA Ye s NA NA NA

Compatibility

Peripheral F1 series F4 series

Comments Pinout SW compatibility

FSMC Yes

WWDG Yes Yes Same features

IWDG Yes Yes Same features

DBGMCU Yes Yes Same features NA Full compatibility

CRC Yes Yes Same features

EXTI Yes Yes Same features Identical Full compatibility

CAN Yes Yes Same features Identical Full compatibility

PWR Yes

RCC Yes

SPI Yes Ye s +

USART Yes

12/17 Doc ID 018608 Rev 3

Ye s + Enhancement Identical Full compatibility

NA Full compatibility

Ye s + Enhancement NA Full compatibility

Ye s + Enhancement NA

Ye s +

TI mode / Max baudrate / I2S full duplex

Bug fix / Max baudrate / One Sample Bit / Oversampling by 8

Identical Full compatibility

Partial compatibility

AN3364 How to migrate across STM32 series

Color key:

= New feature or new architecture (Yes++)

= Same feature, but specification change or enhancement (Yes+)

= Feature not available (NA)

Table 4. STM32 peripheral compatibility analysis F1 versus F4 series (continued)

Compatibility

Peripheral F1 series F4 series

Comments Pinout SW compatibility

I2C Yes Ye s + Bug fix Identical Full compatibility

TIM Yes

DAC Yes

Ethernet Yes

SDIO Yes

USB OTG FS Yes Ye s +

RTC Yes

ADC Yes

FLASH Yes Ye s + + New peripheral NA

DMA Yes

GPIO Yes Ye s + + New peripheral Identical

CEC Yes

Ye s +

Ye s + DMA underrun interrupt Identical Full compatibility

Ye s +

Ye s + Bug fix Identical Full compatibility

Ye s + + New peripheral

Ye s + + New peripheral NA

NA NA NA NA

32-bit Counter in TIM2 and TIM5

IEEE1588 v2 / Enhanced DMA descriptor

- Dynamic trimming capability of SOF framing period in Host mode

- Embeds a VBUS sensing control

Identical Full compatibility

Identical for the same feature

New driver

Partial compatibility

USB FS Device

Crypto/hash processor

RNG

DCMI

USB OTG HS

SYSCFG

Ye s

NA Yes NA NA NA

NA NA NA NA

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How to migrate across STM32 series AN3364

Table 5. STM32 peripheral compatibility analysis F1 versus L1 series

Compatibility

Peripheral F1 series L1 series

Comments Pinout SW compatibility

No I2S in L1 Medium-density

SPI Ye s

Ye s

series

Identical Full compatibility

L1 vs. F1: limitation fix

WWDG Ye s Yes Same features NA Full compatibility

IWDG

DBGMCU

CRC

EXTI

USB FS Device

DMA

TIM

SDIO

Ye s Yes Same features NA Full compatibility

Ye s Yes Same features Identical Full compatibility

Ye s Yes Same features NA Full compatibility

Ye s Yes Same features Identical Full compatibility

Same features but only

FSMC

Ye s Ye s

SRAM/NOR memories are

Identical Full compatibility

supported

PWR Ye s Ye s + Enhancement NA

RCC

Ye s Ye s + Enhancement NA Partial compatibility

Full compatibility for the same feature

Limitation fix / One Sample

USART

I2C

DAC

ADC

RTC Ye s Ye s + + New peripheral

Ye s Ye s +

Bit method / Oversampling by 8Identical Full compatibility

Ye s Ye s + Limitation fix Identical Full compatibility

Ye s Ye s + DMA underrun interrupt Identical Full compatibility

Ye s Ye s + + New peripheral Identical Partial compatibility

Identical for the same feature

Not compatible

FLASH Ye s Ye s + + New peripheral NA Not compatible

GPIO

CAN

CEC

Ye s Ye s + + New peripheral Identical Not compatible

Ye s NA NA NA NA

Ethernet

Ye s NA NA NA NA

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AN3364 How to migrate across STM32 series

Color key:

= New feature or new architecture (Yes++)

= Same feature, but specification change or enhancement (Yes+)

= Feature not available (NA)

Table 5. STM32 peripheral compatibility analysis F1 versus L1 series (continued)

Compatibility

Peripheral F1 series L1 series

Comments Pinout SW compatibility

LCD glass NA Yes NA NA NA

COMP NA Yes

SYSCFG NA Yes NA NA NA

AES NA Yes

OPAMP NA Yes NA NA NA

NA NA NA

1.2 Software migration

Each STM32 series is supported by a complete range of high-end and low-cost evaluation, software, debugging and programming tools.

This complete line includes third-party solutions that come complete with an integrated development environment and in-circuit debugger/programmer featuring a JTAG and/or SW application interface. Developers who are new to this series and the Cortex™ core can also benefit from the range of starter kits that are specially designed to help developers evaluate device features and start their own applications.

Thanks to ST firmware libraries and a comprehensive set of application notes, STM32 microcontrollers offer a complete software interface to reduce the time to market and keep the user code independent from hardware details. The state-of-the-art and highly efficient library of software drivers combined with extensive support for all major tool providers offers a fast route to best-fit and an optimized development process.

Doc ID 018608 Rev 3 15/17

Revision history AN3364

2 Revision history

Table 6. Document revision history

Date Revision Changes

20-Jul-2011 1 Initial release

01-Mar-2012 2 Added medium+ and high-density STM32L1 devices

30-May-2012 3 Added STM32F0 and STM32F4 devices

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AN3364

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Doc ID 018608 Rev 3 17/17

ST AN3364 Application note

Specifications and Main Features

Frequently Asked Questions

User Manual