Search found 1505 matches

by stevestrong
Fri Sep 22, 2017 12:29 pm
Forum: Projects
Topic: OV7670, Generic STM32F103RC and ILI9341 display
Replies: 291
Views: 11539

Re: OV7670, Generic STM32F103RC and ILI9341 display

Just for the record, here an example how to write BMP: http://forum.arduino.cc/index.php?topic ... #msg849962

and a nice JPEG encoder (for STM32L1): https://github.com/mitchd/vt-fox-1/tree ... de/encoder
by stevestrong
Fri Sep 22, 2017 8:47 am
Forum: Builds and Announcements
Topic: Unverified user deletion
Replies: 2
Views: 45

Re: Unverified user deletion

Makes sense.
by stevestrong
Fri Sep 22, 2017 8:45 am
Forum: Ideas & suggestions
Topic: Differential ADC (ADC1-ADC2)
Replies: 12
Views: 241

Re: Differential ADC (ADC1-ADC2)

My experience is that the only way you get reasonable ADC values (having low noise +/-1 bit (!!), non-differential input) is to feed the BP from a battery (~3.6V). Then I used to send the sampled values over SPI to another BP, having only GND and the SPI lines common for both BPs. Important is to se...
by stevestrong
Thu Sep 21, 2017 11:08 am
Forum: New users MUST post here first, and let us know a bit about you and your projects
Topic: Hi every one KHODIDAS from INDIA
Replies: 4
Views: 111

Re: Hi every one KHODIDAS from INDIA

The Arduino_STM32 core has no USB host functionality implemented.
You could try the generic core or the official STM32 core.
by stevestrong
Wed Sep 20, 2017 2:04 pm
Forum: USB bootloader
Topic: MapleMini : Standalone Bootloading and USB/Serial Usage
Replies: 10
Views: 97

Re: MapleMini : Standalone Bootloading and USB/Serial Usage

I can follow you, that is why I suggested the link. Please use the DFU loader, involved by uploading to the bootloader:http://wiki.stm32duino.com/index.php?title=Uploading_a_sketch#Upload_via_STM32duino_bootloader Have a look to the maple loader BAT file: https://github.com/rogerclarkmelbourne/Ardui...
by stevestrong
Mon Sep 18, 2017 8:12 pm
Forum: Working / ported libraries
Topic: New SdFat library (with and without DMA)
Replies: 154
Views: 16288

Re: New SdFat library (with and without DMA)

Just fyi, I added support for F4 (SPI and SDIO) to SdFat library from Greiman: https://github.com/stevstrong/SdFat
PR is ongoing: https://github.com/greiman/SdFat/pull/69
by stevestrong
Mon Sep 18, 2017 6:36 pm
Forum: General discussion
Topic: Overactive interrupt triggering using internal pullups
Replies: 42
Views: 1210

Re: Overactive interrupt triggering using internal pullups

First, you should define all variables used in ISRs as "volatile". Second, it does not seem to be a bug for me, it is rather the MCU which runs couple of times faster than the AVR processors. Third, you should put a resistor (100 Ohm) in series with the capacitor to the button in order to reduce the...
by stevestrong
Mon Sep 18, 2017 12:08 pm
Forum: Libraries & Hardware
Topic: Adafruit_ILI9341_STM - improvements
Replies: 18
Views: 713

Re: Adafruit_ILI9341_STM - improvements

Manny, I see that you are using non-DMA transfers. Is there any reason why you don't use DMA transfers?

Anyway,I posted two PRs to Greiman's repo to solve this issue. https://github.com/greiman/SdFat/pulls
by stevestrong
Sat Sep 16, 2017 4:22 pm
Forum: Ideas & suggestions
Topic: Differential ADC (ADC1-ADC2)
Replies: 12
Views: 241

Re: Differential ADC (ADC1-ADC2)

With simultaneous ADC conversion (the ADC1 samples in the exactly same time as the ADC2 does) the common noise voltage cancels (because we do u1 - u2). ... theoretically. But it did not work for me, I tried that a half a year ago, still got sporadically some differential noise. Maybe due to unequal...