could'nt recieve integers at master from slave

[DarXSouls]

well in 'Wire examples' for (stm32f10c bluepill) the character array works pretty good..., but when slave sender modified to send integer there is no serial print in master reader ... gets struck at some unknown point..., works fine for one byte transfer....,and not any more for two bytes or more.. can anyone fix this bug???

[fpistm]

@Deadshot555 could you provide more information.
Host OS, IDE version, core version, exact sketches you used, what is expected...
There an issue template for that, so pleas follow it else I will not be able to provide support.
https://github.com/stm32duino/Arduino_Core_STM32/blob/master/.github/ISSUE_TEMPLATE/bug_report.md

[DarXSouls]

OS: [ Windows10]
Arduino IDE version: [1.8.9]
STM32 core version: [1.5.0]
Tools menu settings [Newlib nano(default)]
Upload method: [serial]
Board (Generic STM32F1 Series):
Name: [BluePill F103C8]

[DarXSouls]

// Wire Master Reader
// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library
// Reads data from an I2C/TWI slave device
// Refer to the "Wire Slave Sender" example for use with this

// Created 29 March 2006

// This example code is in the public domain.


#include <Wire.h>

void setup()
{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
}

void loop()
{
  Wire.requestFrom(8, 2);    // request 6 bytes from slave device #2

//  while(Wire.available())    // slave may send less than requested
//  { 
    byte c = Wire.read(); // receive a byte as character
    byte d = Wire.read(); // receive a byte as character
    Serial.print(c);         // print the character
//  }

  delay(500);
}

master_sender

[DarXSouls]

// Wire Slave Sender
// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library
// Sends data as an I2C/TWI slave device
// Refer to the "Wire Master Reader" example for use with this

// Created 29 March 2006

// This example code is in the public domain.


#include <Wire.h>

void setup() {
  Wire.begin(8);                // join i2c bus with address #8
  Wire.onRequest(requestEvent); // register event
}

void loop() {
  delay(100);
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent() {
  Wire.write(22); // respond with message of 6 bytes
  Wire.write(33); // respond with message of 6 bytes
  // as expected by master
}

slave_sender

[DarXSouls]

please ignore the comments there.... i have just modified the example code

[fpistm]

Please kept original code then update it to send/receive only one integer.
Note that integer will be cast to uint8_t so ensure it is less than 255.

[DarXSouls]

yeah we are able to transfer master to slave by multiple bytes(as you said unit8_t) but unable to transfer from slave to master using same bytes, it is supporting only one byte transfer. i could'nt transfer two bytes or more....

[DarXSouls]

the prescise problem is like to transfer two or more bytes from slave to master

[DarXSouls]

note: issue only on numerical bytes... character bytes are going good

[fpistm]

Transferring a char, a byte or a casted value to uint8_t is the same.
Your code stuck because you do not handle properly how you request and how you send. Then I2C is probably in busy state as it wait.
Even your screenshot code of both ketch is not aligned.
Using available API is the right way to ensure they are something to read:
https://www.arduino.cc/en/Reference/WireAvailable

Further reading: Wire API
https://www.arduino.cc/en/Reference/Wire

[DarXSouls]

i have communicated between multiple arduino'susing i2c both ways and stm32 series with roger clark's stm32 addon... and also here in one way but there is bug for the other way..(.) i do too agree that char byte and numerical byte is same but the char on moodification in any way it is working but for numerical byte transfer only one byte is getting transferred, if i do request 2 or more bytes it strucks.. and when ever i reset the board it it prints once only the last byte not any other bytes. i tried most possible ways of i2c basic communication examples available online for 6 hours, none resulted luck. and last the screenshot was a mistaken one. one can consider those two codes are the real challange of this issue#488 master as promini and slave as stm32

[rikykumar]

if you make stm32 as a master and promini as slave it is working fine in both ways . but when stm32 was made to be slave and promini as master.. could not get numerical data from promini to stm32
really fishy

[DarXSouls]

i tried with a new pair of boards still could'nt get numerical bytes...can anyone verify the problem