we are doing a project for receiving data from a device using a RS232 to ethernet converter (gridconnect net 232+) onto to a Atmel board. When we connect the converter to the PC, we are getting the output but not when connected to the microcontroller board. We need to know if there has to be some network confirguration to be done on the converter in order to receive it on the microcontroller.
Thanks !
I haven't worked with that board or device, but with any RS-232 communication channel you should check that all RS-232 parameters are set up correctly on both sides. Databits, stopbits, parity settings, etc. Even one setting being off will completely stop RS-232 communications.
Once that is done, I'd hook up a terminal emulator of your choice to simulate the microcontroller side and make sure that you're getting the right traffic from the Ethernet side. You might get lucky at that point and everything might start working. ;)
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I want to send data through USB between STM32 and Raspberry Pi. I don't want to use USB to Serial convertor, but instead have a actual USB Connection (maybe CDC class). I have to send data at high rate (Full speed). Please guide on how to achieve this?
A USB-serial connector is simply a microcontroller implementing a USB CDC/ACM virtual COM port and bridging to a UART which you would connect to a microcontroller's UART interface.
In your case you can simply implement the CDC/ACM directly on the STM32 using either of its USB device controller peripherals (USB support varies depending on the specific device https://www.st.com/resource/en/application_note/dm00296349-usb-hardware-and-pcb-guidelines-using-stm32-mcus-stmicroelectronics.pdf).
How you actually implement that will depend on what specific part, and what library or framework ecosystem you are using (e.g. SPL, CubeMX, Mbed). There are reference implementations, examples, drivers and libraries for all of these.
Your milage may vary, but I have measured ST's own USB library and example CDC/ACM virtual COM for STM32F1xx on a 72MHz MCU achieving 700kbits/s. Note that the performance is independent of the baud rate you might set on the host when you open the he VCP. Setting the baud rate simply sends a control packet to the device that can be used to set the baud rate of a UART in bridging applications. In your case such control packets can be ignored. There are similar packets for modem control signals such as DTR, RTS, CTS and RI, which you might choose to us for flow control or other signalling.
I've been tasked with figuring out how to get a mobile app to communicate with an MCU then in turn control a stepper motor. Right now I'm trying to get the WiFi module (ESP8266-01) and MCU (NUCLEO-F030R8) to play nice with each other. The catch is I have little to no experience and no education in this field. The closest experience I have is simple Arduino sketches from years ago (IE photo-resistor values driving a stepper motor) and making desktop applications with C#. I am using STM32CubeIDE but if there's a better option I can switch to that.
What I would very much like help on is send and receive simple data between a smartphone and the MCU via the WiFi module. I've read through documentation and other questions but still don't exactly know where to start.
I understand this is probably a large topic in its own right and a short blurb on the internet won't do it (and undoubtedly its multiple subcategories) justice. But I might as well ask.
Sorry if this is too much and thank you in advance.
This project would involve making the following connections.
The UART connection between STM32 and ESP8266.
The WiFi connection between ESP8266 and the mobile.
The application layer protocol between ESP8266 and the application running on the mobile.
For 1, you can actually program the ESP8266 using Arduino IDE and simply connect the UART TX/RX pins of ESP8266 with RX/TX pins of STM32 respectively. You can create a test project in which ESP8266 sends data to STM32 over UART to verify this connection.
For 2, you need to consider the wifi network mode i.e identify whether the wifi connection is going to be ad-hoc (mobile connects to ESP8266 directly) or in infrastructure mode (mobile and ESP8266 connected via a shared access point). You can configure the ESP8266 in both modes. You just have to program the SSID and password of the Wifi network in the ESP8266 (in case of ad-hoc, it is the SSID of the network advertised by ESP8266 and in the infrastructure mode, it is the SSID of the common AP). This wifi functionality is also easily programmable in Arduino IDE for ESP8266.
Finally, once the physical connection has been established between the ESP8266 and mobile device, you need an application-level protocol to connect the application running on the mobile with the ESP8266. You can either use socket connection between ESP8266 and mobile application or use a higher-level communication protocol for IoT devices like MQTT, which is also available in the Arduino IDE.
Final connection diagram could be something like this:
application -> mqtt msgs -> wifi packets -> esp8266 recv pkts -> parse mqtt msgs -> forward data to STM32 over UART
I made some experiments with this amazing module. Now I'm trying to level up my project so I connected it to my Raspberry Pi via UART.
I'm able to send AT commands to make simple connections like I do on my Arduino. How can Linux "see" it like a real WLAN0 interface?
I'd like to use the ESP8266 as an access point to surf the web (maybe bridging the ethernet cable interface).
Is it possible?
No, you can't (easily) make the ESP8266 a true WiFi device for Linux. Although projects like this one here have figured out how to put the device into an ESP8089 mode to use it as a true WLAN interface, it requires modifying the module itself.
You can, however, use the device's AT API to connect to the internet through a UART and send any arbitrary data, or develop your own firmware to pass data back and forth to a server with the ESP8266 - None of these though would allow a seamless TCP connection like an actual WiFi card would, however.
I bought a Lilypad Arduino, for which an FTDI socket is required to connect to my PC. The first socket I tried on didn't power up the Arduino, because of some hardware damage. Thus, I got another socket, but with 4 female pins (Vcc, Gnd, TX, RX), unlike the previous one that had 6 male pins. Let's call the second socket as X. With X, the Lilypad is getting powered up through USB cable. Then, when I tried to upload my source code the first time, it started working.
But when I uploaded it some time later, an error called 'programmer is not responding' occurs always, which I'm unable to resolve.
What should I do?
To program an Arduino (and Arduino-compatibles), you need an FTDI adapter that has an RTS pin, as well as the Vcc, Gnd, TX, and RX pins.
The RTS pin connected to the reset circuit on the Arduino, putting the bootloader into programming mode for a few seconds.
You may be able to get it to work by resetting the Lilypad with it's reset button, then upload your sketch within a few seconds after the reset. Alternatively, or for the least hassle, get an FTDI adapter with all the needed signals. I recommend Adafruit's FTDI Friend.
I have a development board of stm32f103VE and i want to use enc28j60 to send data to PC .
I have a sample code from st.com .I used it but there wasn't any response and when i joint the cable from my board to PC ,the orange and green LED weren't on. I am not very familiar with this protocol to transmit data.
Can anybody help me to dissolve this problem?
Should i configure something in my PC?
Two ethernet devices would communicate if they are in the same subnet. so the subnet mask of the pc and what you set in your microcontroller must be same.
If you are directly connecting to PC (without any switch), use a cross ethernet cable