Can anyone please explain how to establish a communication between stm32 dev board and gps module? I am not knowing how to send AT commands to gps module through MC through a source file through UART. Please clarify me in this aspect.
There is a lot of literature on STM32 and UARTs on the web. If I were you I would download the STM32CubeMX. This program generates most of the code for you. You select your processor (or development board), select the clocks and peripherals, and click Generate Code. It also comes with very handy example projects, and might even have a complete project with a working UART that you can put straight onto your board.
And I would first make sure my UART is fully working before connecting the GPS. This you can do by trying to echo. Connect your TX and RX pins with a wire. Then, everything you transmit you will receive as well. It's a easy test to see if everything is working.
I would also work through the TrueStudio IDE. It basically works plug and play
If you use the ublox module, you must use a serial port to communicate.
You have to connect RXD(ublox) to TXD(micro) and TXD(Ublox) to RXD(micro) ,
and config your StmCubemx like This :
http://wiki.sunfounder.cc/index.php?title=Ublox_NEO-6M_GPS_Module
Config Stm32 :
[Step 1: https://i.stack.imgur.com/1B4Ed.jpg ]
[Step 2: https://i.stack.imgur.com/6ULOm.jpg]
[Step 3: https://i.stack.imgur.com/GD0VL.jpg]
If you have another question, please ask
First of all, I think you should test AT command with module sim through (USB to UART) to PC in order to understand procedure operation, such as: module sim - TCP/IP - thingspeak server. The next time, you can refer this link for code: https://bitbucket.org/mbari_peter/sim800-mqtt-ravi/src/78e36076c89b4618cf57a538f0c70f91b2b876dd/modemDrivers.ino?at=master&fileviewer=file-view-default
If you have any questions or encounter any problems, you can ask! Thanks for reading!
Typically, GPS sends data # 1 Hz after starting up. You just need to capture this NMEA sentences and filter the receive buffer according to your requirement.
Try using UART receive interrupt. Make sure the baud rate of both GPS module and STM32 are same.
Related
I'm working on a BMS project for an electric car. I'm using LTC6804-2 for voltage and temperature measurement in each cells. As a first step of development, I would like to establish a successful communication with the monitoring IC (LTC6804-2). So, I'm sending set config register command and trying to read back the config register values that I have written. If I receive the configuration register values without a CRC error, I consider my communication as successful.
In my case, I do not receive expected register values with proper CRC when I read back. Let me break down my situation into small segments.
I'm working on a custom BMS board for this project(LTC6804-2 and STM32F072). I will attach the schematics below. To test my code, I tested my program with DC1942C demo board and arduino UNO. And it is working fine. I can read back the config register and I can calculate the cell voltage and Auxiliary values.
When I try to implement the same program in my custom BMS board, I'm not getting the correct values. I always get CRC error in the received data.
Following the guidelines from the Analog Devices forum, I tested the Vref2 value after sending the config register command, and the voltage goes up to ~3V as expected. So the IC is receiving the message properly. But Why it is not transmitting back?
Below are the captures from the demo board and BMS custom board.
Register read capture from Arduino Uno and demo board DC1942C
Register read capture from the custom board
In fact I tested the program with STM32 development board and DC1942 demo board, I get the correct values.
Thank you for your help. If you want any additional details, please let me know.
LTC6810-2 datasheet
We want our device (STM32-F446RE running FreeRTOS + Telit ME310G1 modem) to communicate to the AWS cloud. We are trying to follow the Cellular Interface Library Demo, in particular following this- diagram
We are using coreMQTT Agent, MbedTLS libraries, the amazon communication interface implementation for UART and amazon UART API implementation.
UART using 115200 baud rate.
Currently failing on the Cellular_Init function when trying to send the first AT command to the modem, specifically when calling the HAL_UART_TRANSMIT_IT function from the above comm interface send function. While debugging we see that the USART1_IRQHandler is called infinite times and nothing is sent through the UART communication.
We are using the default handler, do we need to implement it in any way?
void USART1_IRQHandler(void)
{
HAL_UART_IRQHandler(&huart1);
}
Any help will be appreciated.
Thanks in advance,
Guy
Sounds like the UART line from HW point of view are not in a good state (High).
Did you check and ensure that the Power On sequence is done correctly? (Power On telit pin shall be high).
I expect you have some logic to translate the 1.8v to 3.3v and vice versa.
Can you check by measuring the different voltage that everything is OK?
If you verified all the point above.
Do you perform a reset on the telit side before starting the AT communication?
This ensure that you don't leave the module into a data mode where no AT commande are possible
Yacine
hm-10 shild
hello,
did anyone here used HM-10 SHIELD ?
i need a code that after the first pairing any time that the HM-10 SHIELD will identify my ble\phone then the HM-10 SHIELD or the arduino will send a massage or any other command to pc or other
thanks!!!
Reg
MBK
i am new at this tech and i am still learning but i really love to try.
So far I've connected the hm-10 to the Arduino and managed to send some basic commands to it. I'm looking for a code that will help me understand how to use it for proximity (when a device is connected or near the BT range)
thanks !
MBK
I have a Netduino Plus with at transeiver attached via SPI. I would like to reset the transiever every time the Netduino restarts. Is it possible to programmatically power on/off the 3V3 pin?
I would recommend using a FET (controlled by one of the I/O) pins to enable/disable 3V3 power to your transceiver. When you say transceiver, I think "more than a few mA" :)
BTW, we took this feedback into account with the new Shield Base module for Netduino Go. It has an integrated FET on both 3V3 and 5V power headers, so you could enable/disable power to your shield in code. Once the new Ethernet go!bus module ships and the Shield Base comes out of beta (soon), your solution can be redeployed to Netduino Go + Shield Base with few/no code changes.
Chris
Secret Labs LLC
Looking at the circuit diagram ( http://www.netduino.com/netduinoplus/schematic.pdf ), I can see only the Micro SD Card Slot having its power controlled programmatically. You could rig up a relay to control it (via a transistor, of course) instead, or if the transceiver uses less than 130mA (the current limit of the device shown: http://www.datasheetarchive.com/BSS84W-7-F-datasheet.html) you could copy the circuit from the Netduino Plus. Buying a relay shield looks like overkill, but you might have other uses for it.
Have you looked into resetting the transceiver programmatically instead of the brute-force method of power-cycling it?
Just to provide another view. You could use a transistor powered off the netduino RESET line, this will reset the device every time the netduino reboots. Or you can just link the transistor to a spare digital pin and power it in code..
What specific SPI device are you using? You mention that it's a transceiver but we could probably provide better information if we know the exact part number. If your device requires less than 8mA the Netduino Plus specs seem to indicate that one option could be using a digital output pin as the power source.
Unfortunately Secret Labs don't use exactly the language I'd expect and call out the sink and source current maximums so I would contact them directly first to see if you risk blowing your chip. I'll see if I can get an answer from them and amend this post if/when I do.
Update: Sink and source current is the same on the Netduino. See my post on their forums about sink vs. source current for a more in depth explanation. So, if your device can run off of just a few milliamps you should be able to use a digital I/O pin to power it.
Also, a lot of devices have enable pins. You can usually reset them with that line instead of pulling the power if that helps. Sometimes with flaky hardware it is better to pull the power though.
I have a SPI for MSP430 written. If I send WRSR(01h) or RDSR(05h) to M25P64 flash.
The response I get from the Flash SPI_MISO is FFh.
So my question is "Is the response I have obtained is it right?"
How do I come to an understanding that handshaking between my SPI and Flash is correct?
Thanks
AK
Is the response I have obtained is it right?
The response is wrong. 30 seconds on Google and in the datasheet will tell you that. Things to check (since you have not provided any information):
How do I come to an understanding that handshaking between my SPI and Flash is correct?
Is this a new piece of SPI code? If so have you checked with an oscilloscope to see what you send out (clock and MOSI) is what you expect and matches what the datasheet says the device expects? It's the definitive way to be sure.
Does your SPI code work with any other devices?
Are your IO pins configured correctly on the MSP430?
Have you got the SPI module configured correctly for phase and polarity?
Did you forget to assert the chip select line?
What about HOLD?
Did you remember to send a dummy byte after the RDSR command so that the device would send the status register value?
Do you see a response from the device on an oscilloscope? Does the MSP430 read that value or a different one?
You are sometimes better first of all trying to read the device ID rather than the status register for a new piece of code. The reason for that is the device ID will never change, whereas the status register might change (although that depends on the device).