Posted on September 21, 2016 at 12:28OK, the ST-Link V2 does have the NRST pin, it's the RST one
in electronics, where a pin logic is reversed, often an 'N'/'n' (Not) or sometimes a '!' is put infront of the signal wire name to signify this
so, when pin RST is High/On, this means do-not-reset - (someone plz tell me if I'm totally wrong on this !!!)
As for your board choice, there is a big selection
Whichever one you choose, it's quite a step up from Arduino
The STM32 range has several architectures available, the older ones are Cortex-M3 (shortened to CM3) and newer ones are CM0, CM+, CM4 and CM7
A generalisation: CM0 are the junior ones but still run at ~48MHz (so nice boost over Arduino), CM0+ are low power versions of these (run at 32MHz), others run faster plus often have a Floating Point Unit (FPU) to speed up complex float calcs
There's not really a huge difference in the programming complexity between ranges, so don't expect a CM0 to be 'simpler'
One thing to note is that programs tend to be noticably larger compared to equivalent Arduino ones
The Nucleo boards are relatively basic with just an LED and user button but cover most of the chip ranges: CM0, CM0+, CM4, CM7
the Discovery boards tend to have more features: gyros/magnetometers/ePaper/Displays/Touch Pads/LEDs etc on them (but avoid the CM3's as they are getting on)
To find out more on what features each board has, search out the User Manual pdf's (prefixed UMxxxx) on the ST website
what to go for, well it kinda depends on what area you want to play around with ?
displays, sensors, led's ?
