There are three SPI controllers, three I2C controllers, and three UARTs. It is faster, 100 MHz, has more SRAM, 128 KB, and 512 KB of flash. There is a new NUCLEO-F411RE ($10.33 from Future Electronics).
#NUCLEO F401RE ARDUINO LIBRARY SERIAL#
This does not interrupt the connection to the serial monitor since there is a second STM32F103 that handles the serial monitor, programming flash, and debug. I now program flash by drag and drop of the apps. I continue to be pleased with the Nucleo boards. STM Studio reads data through the ST-Link SWD debug port so it does not interfere with the real-time behavior of applications. STMStudio reads the elf file generated by the linker to find and displays variables in real-time. Several people have posted Makefiles templates to build projects generated by STM32CubeMX. STM32CubeMX creates a project with the generated start-up code and copies needed library code to the project. The power-consumption wizard estimates the application's power usage. The peripherals-and-middleware wizard aids configuration to avoid unusable settings. The user interface is a diagram of the clock tree and you just edit this diagram. The clock-tree wizard assigns clocks and performs dynamic validation. The STM32CubeMX pin-out wizard assists pin assignment to avoid conflicts and has a constraints solver. STM32CubeMX is a graphical configuration tool that automates configuration and generation of STM32 initialization C code. STM32CubeMX is a big improvement over previous ST configuration tools. I have started using STM32CubeMX to configure Nucleo projects and several other STM32 boards.
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