uart | serial com api -

by tonyrog C Version: Current License: No License

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kandi X-RAY | uart Summary

uart is a C library. uart has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

serial com api

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Support

uart has a low active ecosystem.

It has 36 star(s) with 25 fork(s). There are 10 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 1 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of uart is current.

Quality

uart has no bugs reported.

Security

uart has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

uart does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

uart releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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uart Key Features

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uart Examples and Code Snippets

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Community Discussions

Trending Discussions on uart

Log an array of bytes without fragmenting heap

EMBEDDED C - Volatile qualifier does not matter in my interrupt routine

Converting a HEX value to DECimal value in C

Why are "\000" characters being inserted between characters of a char array?

Sending Sensor Data to Firebase using ESP32+Sim800L

C++ not writing whole data to UART port

USART3 Initilization STM32F103RB

Set conditional make options in the robot framework

Sending uint8_t array as string in HTTP GET request in C

How to use both MFRC522 and RDM6300 using a NODEMCU

QUESTION

Log an array of bytes without fragmenting heap

Asked 2021-Jun-15 at 19:36

I am running some code on a STM32 chip which is logging to my uart port.

I am having a hard time finding the proper way to log an array of bytes. I wrote this function:

...

ANSWER

Answered 2021-Jun-15 at 19:36

If the problem did end up being from heap overuse (from strncat), then you could try out this implementation that uses the return from sprintf to append to the string as your building it.

Source https://stackoverflow.com/questions/67992301

QUESTION

EMBEDDED C - Volatile qualifier does not matter in my interrupt routine

Asked 2021-Jun-13 at 19:31

I am new to embedded C, and I recently watched some videos about volatile qualifier. They all mention about the same things. The scenarios for the use of a volatile qualifier :

when reading or writing a variable in ISR (interrupt service routine)
RTOS application or multi thread (which is not my case)
memory mapped IO (which is also not my case)

My question is that my code does not stuck in the whiletest();function below when my UART receives data and then triggers the void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) interrupt function

...

ANSWER

Answered 2021-Jun-13 at 16:12

volatile informs the compiler that object is side effects prone. It means that it can be changed by something which is not in the program execution path.

As you never call the interrupt routine directly compiler assumes that the test variable will never be 1. You need to tell him (volatile does it) that it may change anyway.

example:

Source https://stackoverflow.com/questions/67959610

QUESTION

Converting a HEX value to DECimal value in C

Asked 2021-Jun-11 at 01:19

I have tried out many ideas from SO. One of them worked (output was DEC 49 for HEX 31) when I tested it in here onlinegdb. But, when I implemented it in my application, it didn't produce same results. (output was 31 for 31 again).

The idea is to use a string value (full of HEX pairs); An example; 313030311b5b324a1b5b324a534f495f303032371b

I need to convert each integer pair (HEX) into equivalence decimal value. e.g.

...

ANSWER

Answered 2021-Jun-11 at 01:19

You can use strtol function to convert your hex string to binary and then convert it to a decimal string in a single line:

Source https://stackoverflow.com/questions/67929558

QUESTION

Why are "\000" characters being inserted between characters of a char array?

Asked 2021-Jun-08 at 15:57

I am attempting to read an incoming stream of data from UART, and trying to add each character received to an array of char until characters \r and \n are received (in that order).

I have written a function (char read_uart()) to wait for then return when a single character is received. This function properly receives and returns the single character, as it should.

On top of this function, I have tried creating another which is supposed to read every character and add them to an array until the termination combination is received. This is it:

...

ANSWER

Answered 2021-Jun-08 at 15:57

There are two issues here.

First, what you're passing to the function isn't what it's expecting. &message has type char (*)[4096], i.e. a pointer to an array of size 4096 of char. The function meanwhile is expecting a char *[4096], i.e. an array of size 4096 of char *. This is a type mismatch.

The second is that on this line:

Source https://stackoverflow.com/questions/67890400

QUESTION

Sending Sensor Data to Firebase using ESP32+Sim800L

Asked 2021-Jun-08 at 05:47

I have a TTGO T-CALL ESP32+Sim800L board and I want to send accelerometer data to Firebase. I am using the TinyGSM library which supports SSL/https connections for Sim800L. I am currently sending dummy data to see if it works but it is giving me a failed flag. Why is it not sending data to Firebase?

...

ANSWER

Answered 2021-Jun-08 at 05:47

I didn't find a lot of resources online, however, I did manage to do this and I made a GitHub repo for anyone who needs help with the same.

Basically as Firebase accepts only Https requests, it is not possible to formulate that on most microcontrollers and GSM modules. To circumvent this problem, I created a php server to which I can send an HTTP POST request and the script can get the data from it and push it to Firebase with a php firebase library.

Source https://stackoverflow.com/questions/67224717

QUESTION

C++ not writing whole data to UART port

Asked 2021-Jun-05 at 14:57

I have been testing UART communication in C++ with wiringPi.

The problem:

It seems that C++ isn't outputting whole data into the UART port /dev/ttyAMA0. Perhaps I'm doing it the wrong way?

Investigations:

Note : I am using minicom, minicom --baudrate 57600 --noinit --displayhex --device /dev/ttyAMA0 to check the received data.

Also! The UART port, RX & TX pins are shorted together.

The python code worked perfectly however when I tried to implement it in C++, the data received is different.

The expected received data should be: ef 01 ff ff ff ff 01 00 07 13 00 00 00 00 00 1b.

Received Data Comparison: Language Used Data Received from Minicom Python ef 01 ff ff ff ff 01 00 07 13 00 00 00 00 00 1b C++ ef 01 ff ff ff ff 01

Code used

Python:

...

ANSWER

Answered 2021-Jun-05 at 14:57

You can't use serialPuts to send the null terminator. As with all similar functions, it will stop when the null terminator is encountered in the string. In this case I think your best option is to add a function that uses the ordinary write function that is used internally by WiringPi's own functions.

You could make a wrapper function to make it look similar to the other calls:

Source https://stackoverflow.com/questions/67850164

QUESTION

USART3 Initilization STM32F103RB

Asked 2021-Jun-03 at 22:28

I'm a beginner when it comes to using STM chips, and I have a project where I have to use all three USART terminals in Uvision.

I am using an STM32F103RB chip, and I already got the first two USART_init functions working, but I can't get the third one to work for some reason. I would really appreciate any help Here are my USART_init functions:

...

ANSWER

Answered 2021-May-31 at 07:34

Your first line for the USART3 initialization is wrong :-)

RCC->APB2ENR |= 1; // enable clock for AF

must be (without a clock the USART doesn't work)

RCC->APB1ENR |= (1<<18); // enable clock for USART

And as an additional hint, do not use all these magic numbers for the bits. This is much more readable (and the needed defines are already done in the CMSIS:

RCC->APB1ENR |= RCC_APB1ENR_USART3EN; // enable clock for USART

Source https://stackoverflow.com/questions/67766841

QUESTION

Set conditional make options in the robot framework

Asked 2021-Jun-02 at 20:28

In my robot file for a specific test, I've defined the variable uarts_to_test to a list of numeric values under variables:

...

ANSWER

Answered 2021-Jun-02 at 10:10

I was not able to find ${i} in your code. There is also no declaration of ${make_options} that is probobaly why it is not found. You can use collection library, create list and append the items to it. like so

Source https://stackoverflow.com/questions/67801903

QUESTION

Sending uint8_t array as string in HTTP GET request in C

Asked 2021-May-31 at 14:56

I am stumped at the following problem I face.

I am trying to send a GET request with hex values as part of the path ( the server would recognise this and process it accordingly). Currently, I have it as follows for a test:

...

ANSWER

Answered 2021-May-31 at 14:56

I made an example for you, with all variables correctly defined and initialized:

Source https://stackoverflow.com/questions/67772778

QUESTION

How to use both MFRC522 and RDM6300 using a NODEMCU

Asked 2021-May-29 at 00:13

I want to use both MFRC522 and RDM6300 readers on a single NodeMCU, the two separate codes for each readers are respectively :

...

ANSWER

Answered 2021-May-29 at 00:13

void loop() {
if (  mfrc522.PICC_IsNewCardPresent()) {


// Select one of the cards
     if (  mfrc522.PICC_ReadCardSerial()) {



  // Dump debug info about the card; PICC_HaltA() is automatically called
         mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
    }
 }
  if (rdm6300.update())
    Serial1.println(rdm6300.get_tag_id(), DEC);

}

Source https://stackoverflow.com/questions/67745313

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