I am using a STM32F030F4P6 MCU and a LCD 2004 with PCF8574T I2C display driver. I have tried the library from this tutorial: https://controllerstech.com/interface-lcd-16x2-with-stm32-without-i2c/. I have found a datasheet for the PCF8574T device, but there are no commands specified in there. I am quite new in the field, but I already communicated with other devices over I2C and SPI and got them to work. Can somebody tell me what I am doing wrong, or at least show me where to get a datasheet with commands for the device? I am sorry in advance if this is a noob question.
As already mentioned, PCF8574T - is an i2c expander. So you need to write a driver which manipulates data pins on PCF8574T in way described in tutorial you found.
Check the arduino code for this type of LCD. It may save your time/ https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
If you have an Arduino board, you can test your LCD according this tutorial https://create.arduino.cc/projecthub/Arnov_Sharma_makes/lcd-i2c-tutorial-664e5a
Nice to know that your device still alive before debug the code.
Related
I am interfacing LCD module in 8bit mode to STM32F446RE Nucleo board the connections are as below:
connections
wiring (if pic is not clear)
PB0-->RS PB1-->RW PB3-->E
D0-D7-->PC0-PC7
code
Dear members,
I have pasted all my codes.. in the link above The GPIO.h,.c files are 100percent working fine I have checked with other peripheral projects. The delay function also works correctly tested for led blink..
Now I am stuck in LCD program only..
My main aim is to just display 1 character I have gone through datasheet and forums and have taken everyones's suggestion accurately I still can't figure out what's wrong with my program..
I have tried this LCD board for arduino program it works there.
Also I have checked voltage specifications and all pin's connected are 5v Tolerant as per stm32 datasheet.
Please can someone figure out whta I may be doing wrong..
Your suggestions may help me..
I would be greateful..
I have designed and assembled a PCB. All connections are fine and leds are blinking when i open the CUBEMX. But I don't know what to do after this point. Do I need to put some drivers before using DFU?
If so, i don't have an ST-LINK Programmer how can i use the only input for this pcb (which is PB11,PB12 as AN2662 suggests). Its also interesting that device is responding to CubeMX . Does device has any code in it?
MCU :
STM32F405RGT6
Your question is not clear. But i will try to answer to your question with my understanding from the question. First thing that you need to find the datasheet of mcu. Now, you can able to find related pins for programming. Using these pins, you can program your hw.
if you want to put dfu mode to your hw, Please check "Application Note 2606 STM32 microcontroller system memory boot mode".
Also, i wrote post about system memory bootloader, here is the link: https://engineeringvolkan.wordpress.com/2020/05/08/1928/
If I understood well, you want to learn how to upload code into your uC. If you are not familiar with DFU, I suggest that you can use ST LINK V2. However, the important point is whether, or not you put output terminals for SW pins (SWDIO, NRST, SWCLK, SWO).
For the DFU, you should check Bootloader properties and bootloader configurations specifcally related to your uC. After these, you can watch this video EEVBlog STM32 DFU and inspire from it.
My STLINKV2 is not working anymore, not detected by Linux, it failed after the first successful flash. I ordered a new one but it will take 60+ days to arrive. Meanwhile I have heard on Youtube you can program Bluepills directly by connecting cut open USB cable to certain pins and then using a jumper. But I cannot get any precie information on this, is this really possible and how?
You should use the embedded bootloader. You can flash it through several interfaces. Look at AN2606, maybe you can find an already written flasher. Good luck STM32CubeProgrammer handle it.
If you intend to program it through usb, look also at AN3156 all protocols document are referred in chapter 2 of AN2606
THOSE AREN'T CUT OPEN USB CABLES they are USB to serial adapters for arduino's bootloader
They connect them like this:
The problem is that this requires the Arduino STM32 bootloader to be flashed in it.
Another option will be to use STM32CubeProg this program allows you to program your stm over
Serial
SPI
I2C
USB
You'll need to set the BOOT0 and BOOT1 pins to the correct value (HIGH slash LOW) to allow it to go in flash mode during boot.
Here is semi outdated tutorial which tells most of the steps to program a STM using serial. (the Flash Loader Demonstrator is outdated and you should use STM32CubeProg)
We have a FTDI device, FT2232H and an EEPROM M93C46-WMN6TP. Is there a utility or a way to program the eeprom in Linux using command line? We do not have provision for GUI in Linux or for connecting it to a windows system.
There is a sample EEPROM folder provided with the driver package that cab used for programming the EEPROM device (/release/examples/EEPROM/write/ )
Write can be checked used the read program in /release/examples/EEPROM/read/
You can absolutely program an EEPROM with a FT232H, but you will have to write your own program.
I am more a Windows person, but the code should similar on Linux.
I just sent a tweet yesterday doing just this with an FT4222 board
that I will use for my USB device Nusbio v2.
https://twitter.com/MadeInTheUSB/status/808868754146914304
A video experimenting with the FT232H
https://www.youtube.com/watch?v=8i8_EFs_j0I
The EEPROM M93C46-WMN6TP protocol seems to be SPI
see datasheet page 6
I suppose you may already have an FT232H evaluation board, so once wired on a breadboard to your EEPROM all the 4 SPI wires (CLOCK, MOSI, MISO, CS) you can start talking to the EEPROM.
Unfortunately the source code from one EEPROM to another thing can change.
I know very well the I2C 24LC256 family and the SPI 25AA1024.
Some of my code is available on github, this is for the SPI EEPROM 25AA1024,
that should help
MadeInTheUSB.Nusbio.SPI.EEPROM_25AA1024
MadeInTheUSB.Nusbio.Components/EEPROM
You can find a 100% already made solution hardware and software at
Nusbio Thumbdrive
Using the source mentioned above.
I hope you can help me. I am trying to build a robot but I am kind of stuck. The Arduino Mega is controlling the stepper motors drivers of the robot. The odroid-x is a single board computer that has installed linaro ubuntu and eclipse c++. All the programming is done in C++ and OpenCV is an image processing library.
The odroid-x has only as input a color camera. Therefore, the information from the camera is received and is processed in eclipse. Then, according to the information that is received, the odroid-x should send different integers to the arduino. The arduino should have a program already uploaded in itself, so it will be waiting for an integer and that integer is going to determine what the arduino is going to send to the drivers.
My questions are the following:
How can I do a serial communication between the arduino and the odroid-x?
How can I send information from eclipse to the arduino with a serial connection?
Thanks so much for any guide you can give me
First, be very, very, very careful. The ODROID boards use 1.8V signalling, so hooking up your 3.3V or 5V Arduino to the pins that expect no more than 1.8V will give you a burnt ODROID-X. It is possible to hook these two boards together if you put a level converter between them, and Sparkfun and Adafruit have some of those converters available. There is even a 1.8V reference voltage pin available... one of the pins that go to the LCD panel RGB-to-LVDS converter board puts out a constant 1.8V.
You could use either the four pins of the little white connector, or UART1, as a serial port, or you can use some of the pins in the 50-pin GPIO block as UART4. There are board schematics available on Hardkernel's website. These two UARTs show up as /dev/ttySAC0 (UART1) and /dev/ttySAC3 (UART4).
I don't know how to talk to those UARTs from a program, personally, but I know there are serial communications libraries available for python from watching threads pop up on the ODROID forums.