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STM32 platform notes.
Most of this information comes from ST AN3427 (Migrating a
microcontroller application from STM32F1 to STM32F2 series) and ST
AN3364 (How to migrate across STM32 series).
The STM32 series of MCUs is divided into series. At time of writing,
the available series are:
- F1 series (STM32F1)
- L1 series (STM32L1)
- F2 series (STM32F2)
- F4 series (STM32F4)
Some notes on the characteristics of, and differences between, the
series follow.
F1 Series
---------
The STM32F1 series is further subdivided into a variety of somewhat
compatible "lines". Performance, value, and connectivity line MCUs are
available. (There's also an access line, which is ignored in these
notes).
At time of writing, libmaple supports medium- and high-density
performance line MCUs. work to port it to other series is ongoing.
Performance line MCU part numbers begin with STM32F101 or
STM32F103. The performance line is further subdivided into
"densities": low, medium, high, and XL.
Value line MCU part numbers begin with STM32F100. Similarly to the
performance line, the value line is subdivided into medium and high
densities.
Connectivity line MCU part numbers begin with STM32F105 or
STM32F107. Mercifully, these are not further subdivided by density.
F2 Series
---------
A revamp of the F1 series, The F2 series address a number of the
STM32F1's deficiencies (both silicon bugs and unfortunate design
decisions), while maintaining a fair amount of software and pin
compatibility.
The F2 series is most similar to the F1 connectivity line. Like the
connectivity line, STM32F2s come with a USB on-the-go full speed
peripheral (like the connectivity line), instead of USB full speed
device (like the performance line).
F4 Series
---------
The F4 series MCUs are essentially equivalent to those in the F2
series, except they have an ARM Cortex M4 core, an FPU, and support a
higher clock frequencies (168 MHz instead of 120 MHz).
L1 Series
---------
This series is intended for low-power applications.
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