Electronics > Microcontrollers

STM32 F3 Discovery Board

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Just received an email from Digi-key they are selling a STM32 F3 Discovery Board for $ 10.90.
The board has the following features:

    STM32F303VCT6 microcontroller featuring 256 KB Flash, 48 KB RAM in an LQFP100 package
    On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging)
    Board power supply: through USB bus or from an external 3 V or 5 V supply voltage
    External application power supply: 3 V and 5 V
    L3GD20, ST MEMs motion sensor, 3-axis digital output gyroscope
    LSM303DLHC, ST MEMs system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor
    Ten LEDs:
        LD1 (red) for 3.3 V power on
        LD2 (red/green) for USB communication
        Eight user LEDS, LD3/10 (red), LD4/9 (blue), LD5/8 (orange) and LD6/7 (green)
    Two pushbuttons (user and reset)
    USB USER with Mini-B connector
    Extension header for all LQFP100 I/Os for quick connection to prototyping board and easy probing

I thought is sounded like a good deal for the price, but hey maybe I am out of touch.
Here is the link to the digi-key website, it pre-order only right now:



The thing about the ST boards for me has always been that way the software libraries are written, not fun at all to use.
Make sure you take  a look at the programming environment before you spend money.

Well, for less than $15 you can get an F4Discovery with a 168MHz processor, a meg of flash and 192K of RAM. That's a pretty amazing deal for what you get. Personally though, I'm using a hot-rodded STM32VLDiscovery. I desoldered the original F100 mcu and replaced it with a much more serious F103. I would've used the F4Disco, but you can't plug it into a breadboard because it's got dual headers on both sides.

Here's the VLDiscovery hiding behind a bunch of wires:

The board is supported by ChibiOS (a free RTOS) out of the box and everything compiles cleanly with the Yagarto toolchain on OS X.

The F3Discovery board looks pretty good, but it has those dual headers which take all the fun out of breadboarding.

Well you can always do this  ;)

Every single board ST produces actually is like a amazon kindle fire/google nexus 7 approach, the product costs more than the cost price.

Well, if you ever knew the difference between the F3 and the F4 is that the F4 is a whole new monster to the F3, it's quite literally a lotus exige S vs a bugatti veyron

It's much faster and with a FPU That type of F4 is usually Cortex-M4F

Only thing the F2 doesn't have but it's 3/4 the performance of the F4 is the FPU. That's what it lacks

Plus if you buy the disco boards the two boards it doesn't really make any sense to get the F3 if you already know the performance game, of course neither are particularly good at power consumption. Well that's what the L series is for

I don't know what's the current status, but like a year and a half ago ST libraries used to suck really bigtime. For example there was no function to update PWM duty cycle. If you wanted to change the duty cycle without resorting to pure register math you would have to re-initialize whole pwm module....


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