I2c communication with pic18f4520 and arduino mega 2560 is being delayed

[raushankumar586]

Hello Electronics Enthusiasts ,

I am establishing I2C connection between pic18f4520 and arduino mega module. It is working fine but I checked with oscilloscope that it is delaying so much around 500ms for each bunch of instruction. I am not getting where I am doing wrong....
Here is my I2C implementation

/* 
 * File:  i2cSetup.c
 * Author: Lenovo
 * Created on 23 June, 2017, 6:12 PM
 */
#include "ConfigurationBits.h"


void I2C_Master_Init(const unsigned long c) {
    SSPCON1 = 0x28;
    SSPCON2 = 0;
    SSPADD = (_XTAL_FREQ / (4 * c)) - 1; // FOSC/(4 * (SSPADD + 1))
    SSPSTAT = 0x80;
    TRISCbits.RC3 = 1; //Setting as input as given in datasheet
    TRISCbits.RC4 = 1; //Setting as input as given in datasheet
}

void I2C_Master_Wait() {
    while ((SSPSTAT & 0x04) || (SSPCON2 & 0x1F));
}

void I2C_Master_Start() {
    I2C_Master_Wait();
    SSPCON2bits.SEN = 1;
}

void I2C_Master_Stop() {
    I2C_Master_Wait();
    SSPCON2bits.PEN = 1;
}

void I2C_Master_WriteC(unsigned char d) {
    I2C_Master_Wait();
    SSPBUF = d;
}

void I2C_Master_WriteS(unsigned char *e) {
    while (*e) {
        I2C_Master_WriteC(*e); // send character pointed to by s
        e++; // increase pointer location to the next character
    }
}

void printToArduino(unsigned char *printOutput) {
    I2C_Master_Start(); //Start condition
    I2C_Master_WriteC(0x12); //7 bit address + Write (000001-0)(SELECT ADDRESS TO COMMUNICATE )
    I2C_Master_WriteS(printOutput); //Write data
    I2C_Master_Stop(); //Stop condition
    __delay_ms(200);
}

void printToArduinoChar(unsigned char printOutput) {
    I2C_Master_Start(); //Start condition
    I2C_Master_WriteC(0x12); //7 bit address + Write (000001-0)(SELECT ADDRESS TO COMMUNICATE )
    I2C_Master_WriteC(printOutput); //Write data
    I2C_Master_Stop(); //Stop condition
    __delay_ms(200);
}

Here Is my arduino Slave reader program in processing.....

#include <Wire.h>

void setup() {
  Wire.begin(9);                // join i2c bus with address #8
  Wire.onReceive(receiveEvent); // register event
  Serial.begin(9600);           // start serial for output
  while (!Serial);
  Serial.println("Setup Complete!");
}
void loop() {       
  delay(100);
}
void receiveEvent(int howMany) {
  char c;
 
  while (Wire.available() > 0) { // loop through all but the last
     c = Wire.read(); // receive byte as a character
     if(c=='\n')
     Serial.println();
      else
    Serial.print(c);
  }
  
}

and I am just wring in a while loop from main program of pic18f4520
printToArduino("Something Something");

Help me , Where I am doing wrong...

 

[FvM]

You get out what you put in...
What's the particular purpose of __delay_ms(200) ?

 

[raushankumar586]

You get out what you put in...
What's the particular purpose of __delay_ms(200) ?

Even I tried with removing those 200ms delay , believe me then also same delay between two response , nothing changed

 

[andre_luis]

The Serial.println() function within receiveEvent is likely delaying the release of the I2C bus to the Master.