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by ag123
Fri Jun 03, 2022 9:11 am
Forum: General discussion
Topic: STM32F103C8T6 Reference Voltage READ
Replies: 15
Views: 4752

Re: STM32F103C8T6 Reference Voltage READ

your formula looks right, the adc won't get the full 3.3v at the top in part due to the various electronics (e.g. transistors in there) being a little less than 3.3v looks normal. As things I do normally won't need very high precision or accuracy, i'd make do other ways you could verify things is to...
by ag123
Fri Jun 03, 2022 7:31 am
Forum: General discussion
Topic: STM32F103C8T6 Reference Voltage READ
Replies: 15
Views: 4752

Re: STM32F103C8T6 Reference Voltage READ

Vrefint is in the data sheet https://www.st.com/en/microcontrollers-microprocessors/stm32f103c8.html 5.3.4 Embedded reference voltage VREFINT min 1.16, typ 1.2 max 1.24 v that is the adc reading you get for 1.2v so assuming a linear range, and that the top is vdd 3.3v by linear projection : adc read...
by ag123
Thu Jun 02, 2022 4:26 am
Forum: General discussion
Topic: Problem with data reception after iBus
Replies: 8
Views: 2530

Re: Problem with data reception after iBus

Serial monitor is normally Serial.println("hello world"); you can replace that with anything you want to print, so you could print anything to have it sent back to your serial monitor to look at I'd suggest copy that library into the project folder both the include and cpp file, then put t...
by ag123
Thu Jun 02, 2022 4:19 am
Forum: General discussion
Topic: STM32F103C8T6 Reference Voltage READ
Replies: 15
Views: 4752

Re: STM32F103C8T6 Reference Voltage READ

google search for RM0008 stm32f103 you should get this https://www.st.com/resource/en/reference_manual/cd00171190-stm32f101xx-stm32f102xx-stm32f103xx-stm32f105xx-and-stm32f107xx-advanced-arm-based-32-bit-mcus-stmicroelectronics.pdf look in the chapter for ADC, look under temperature sensor section i...
by ag123
Wed Jun 01, 2022 2:21 pm
Forum: General discussion
Topic: Problem with data reception after iBus
Replies: 8
Views: 2530

Re: Problem with data reception after iBus

if you can output to the serial monitor I'd suggest patch Serial.print() statements in the code, to see what is happening there are some things that is a little curious https://github.com/bmellink/IBusBM/blob/master/src/IBusBM.cpp#L84 #if defined(_VARIANT_ARDUINO_STM32_) void IBusBM::begin(HardwareS...
by ag123
Tue May 31, 2022 8:42 am
Forum: General discussion
Topic: STM32F103C8T6 Reference Voltage READ
Replies: 15
Views: 4752

Re: STM32F103C8T6 Reference Voltage READ

check the core you used. it may help to have #include <Arduino.h> in there, normally not needed.
by ag123
Tue May 31, 2022 8:14 am
Forum: General discussion
Topic: STM32F103C8T6 Reference Voltage READ
Replies: 15
Views: 4752

Re: STM32F103C8T6 Reference Voltage READ

that should work for 'official' core, e.g.

Code: Select all

uint16_t value = analogRead(AVREF);
on datasheet, section 5.3.4 Embedded reference voltage
https://www.st.com/resource/en/datashee ... f103c8.pdf
that is the adc value you get for the internal voltage 1.2v
by ag123
Tue May 31, 2022 7:52 am
Forum: General discussion
Topic: STM32F103C8T6 Reference Voltage READ
Replies: 15
Views: 4752

Re: STM32F103C8T6 Reference Voltage READ

stm32(f103) do not use a 'reference voltage' as like the Atmega. the top of the range is 3.3v VDD, bottom is 0v GND if you want to read the internal AVREF in stm32f103 you could try using these https://github.com/stm32duino/wiki/wiki/API#adc-internal-channels look up the specs sheet for what that is...
by ag123
Mon May 30, 2022 8:11 am
Forum: General discussion
Topic: Linux serial_posix vs. Windows serial_w32
Replies: 37
Views: 6810

Re: Linux serial_posix vs. Windows serial_w32

i looked at some codes https://github.com/fsagbuya/variant-acsip/blob/main/ACSIP_S76S/variant.cpp it seemed you are using HSI? i.e. internal on chip oscillator can you try using one of the generic variants? choose one of those boards e.g. Generic L072RBTx or Generic L072RZTx I'm guessing they may wo...
by ag123
Mon May 30, 2022 6:48 am
Forum: General discussion
Topic: Linux serial_posix vs. Windows serial_w32
Replies: 37
Views: 6810

Re: Linux serial_posix vs. Windows serial_w32

While you make the variant there are quite a few dependencies I'd suggest take a look at how others did it with the custom boards here is an entry in boards.txt for Piconomix PX-HER0 board https://github.com/stm32duino/Arduino_Core_STM32/blob/main/boards.txt#L4184 their specific variant files are fo...

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