Arduino for STM32

I would love to hear how well the APM32 functions. It seems very promising, except the costs are a bit high for smaller quantities. I am particularly curious if USB is fully functional at the higher clock rate, and whether power usage is comparable.

arpruss wrote: Wed Apr 15, 2020 5:01 pm I would love to hear how well the APM32 functions. It seems very promising, except the costs are a bit high for smaller quantities. I am particularly curious if USB is fully functional at the higher clock rate, and whether power usage is comparable.

So, is $1.89 each with free-shipping too much? AliExpress is showing $1.90 for the Blue Pill with free-shipping ... and I believe AliExpress is where some forum members have had issues. Yes, I understand that AliExpress caters to like a zillion vendors, but I have a few that I have used for a long time and those are my go-to merchants. And, I simply never order one of any single item since my standard order is for 3 or 5: The wait is just too long to have only 1 of an item and release the magic smoke and have to wait, wait, wait, wait ...

I am not expecting my order until late May, but after I receive 'em, I will try and take a few hours to play around with one and post back here.

Ray

From my browser:

That's weird. When I use their shipping calculator, the cheapest shipping option for one unit is $3.38 to Texas.

arpruss wrote: Fri Apr 17, 2020 5:20 am That's weird. When I use their shipping calculator, the cheapest shipping option for one unit is $3.38 to Texas.

I cannot explain that ... I got free shipping on 1 unit and paid like $2+ for 10x. Go figure ... even the Chinese know that everyone in Texas is wealthy!


Ray

I also see the "Free shipping" on the website, but on the checkout the lowest shipping option is $3.38 for one and $3.86 for ten.

I asked them and they said:

free shipment was for other items not for Black pill .
I am so sorry .
its for items

arpruss wrote: Mon Apr 20, 2020 5:16 pm I asked them and they said:

free shipment was for other items not for Black pill .
I am so sorry .
its for items

Argh ... they giveth and taketh. I never put just "1" in my cart as I ordered 10x

Still, is ordering just one (1) critical? If I were to USPS you one from Atlanta inma bubble wrapper, my guess would be about $1.

US Postal Service Rate Changes as of January 26, 2020
The new prices include no increase in the price of a First-Class Mail Forever stamp, which remains at 55 cents. The single-piece letter additional ounce price remains at 15 cents. The price of postcard stamps is still at 35 cents, and 1-ounce flats continue at $1.

What I don't understand is why the upload method affects the working of the serial port.

I mean: if I upload via serial port using boot0 jumper, the program works ok. But if I ipload the same program but via st-link, the serial port does not work. May be some some prescaller clock settings or something like this?

(testing with arduino ide)

Make sure that you have this line as shown here: https://github.com/rogerclarkmelbourne/ ... s.txt#L380
-DSERIAL_USB -DGENERIC_BOOTLOADER is important to have.