Search found 666 matches

by ag123
Mon Jul 24, 2017 8:41 am
Forum: Maple mini
Topic: Maple Mini SERIAL PORT is Disabled
Replies: 2
Views: 77

Re: Maple Mini SERIAL PORT is Disabled

please install your sketch in flash (e.g. alt=1 install to 0x8005000 for maple boot loader) you are selecting install to ram which would likely need you to meddle with boot pins etc which is *untested* note that if your maple mini has the stm32duino boot loader installed it would have alt=0 (not use...
by ag123
Mon Jul 24, 2017 7:56 am
Forum: General discussion
Topic: Combining Blink & Count to the bootloader
Replies: 36
Views: 1127

Re: Combining Blink & Count to the bootloader

i didn't actually have an avr, i started messing with mcu's in stm32 & is quite happy that way, :lol: i'd think stm32f1 is actually a good mcu to get started feature rich but an initial rather steep learning curve. the initial goofs as it seemed tend to be messing with those 'perpetual bootloader' b...
by ag123
Mon Jul 24, 2017 7:29 am
Forum: General discussion
Topic: Blue Pill that kills
Replies: 3
Views: 79

Re: Blue Pill that kills

my guess is measuring voltages before and after the LDO and the various components systemically may help to locate the problem. e.g. those 3.3v power pins should read at least around 3v and when usb is connected the 5v pin should read around 5v you may possibly compare the voltages between the good ...
by ag123
Thu Jul 20, 2017 12:14 pm
Forum: Projects
Topic: STEP GPS LOGGER, GPS CLOCK, GPS-SMS send, Bicycle computer and more
Replies: 8
Views: 280

Re: STEP GPS LOGGER and more

wow, but do post in english as more people in the world would be able to read this as well :D
normally i'd simply program this on an android phone as it needs gps + mobile (gsm/3g-wcdma/lte) etc
to do all that on stm32f103cb 20k sram with a gui is quite an achievement :D
by ag123
Tue Jul 18, 2017 7:26 pm
Forum: General discussion
Topic: pricing disparity implies higher forward prices?
Replies: 2
Views: 74

pricing disparity implies higher forward prices?

bluepills are presently selling for $2 maple mini (clones) about double that https://www.ebay.com/sch/i.html?_from=R40&_nkw=stm32f103&_sacat=0 however the list prices on ST's web site http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32-mainstream-mcus/stm...
by ag123
Mon Jul 17, 2017 2:59 pm
Forum: Projects
Topic: stm32 car fuel injection ecu
Replies: 6
Views: 271

Re: stm32 car fuel injection ecu

oops i forget about this thread, but speeduino do look pretty interesting & possibly fun, but do agree that if things go wrong it may be possibly explosive stm32 given its speed vs atmega would likely run both the engine & show you all the graphs e.g. fuel economy on an lcd while the car is running....
by ag123
Thu Jul 06, 2017 4:47 pm
Forum: Off topic
Topic: Help with preprocessor macro/xmacro
Replies: 2
Views: 105

Re: Help with preprocessor macro/xmacro

would an array work? e.g. instead of
led1 = 1;
led2 = 2;
led3 = 3;

use an array instead
int led[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 10 };
:)
by ag123
Tue Jul 04, 2017 6:52 am
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 755

Re: Porting Marlin to STM32.

the L6470 is a much better stepper driver than the Pololu Ramps style drivers 1/128 microstepping and SPI interface it would really make the 3d printing run extremely smooth a4988 and drv8825 has only 16 and 32 microsteps respectively http://reprap.org/wiki/A4988_vs_DRV8825_Chinese_Stepper_Driver_Bo...
by ag123
Tue Jul 04, 2017 6:27 am
Forum: Projects
Topic: RTC CLOCK on BLUE PILL with Four 7 segments
Replies: 16
Views: 622

Re: RTC CLOCK on BLUE PILL with Four 7 segments

i'd guess stm32f103 can take quite a bit of abuse (with leds), i simply lit up my ILI9341 lcd backlight led with a gpio pin across a 900 ohm on board resistor but for 7 segment leds, it is better to be safe and add some resistors perhaps, otherwise 1'd likely be playing dice with the magic smoke mon...
by ag123
Mon Jul 03, 2017 5:10 pm
Forum: Projects
Topic: Porting Marlin to STM32.
Replies: 32
Views: 755

Re: Porting Marlin to STM32.

@Chriss I was having a look at the steppers and the board config file. I see the steppers support an SPI interface, and they can even be daisy chained one to another, so they shift out data to the next stepper as long as CS is kept low, but can also be managed independently with their own CS line e...