ARDUINO I2C PROBLEM WITH ATSHA204

Development Boards Arduino
1

Hi can anyone please help me with Arduino UNO rev. 3 with ATSHA204 (microcontroller=ATMEGA328p)?

First I list my code and then the problem underneath. I am using the atmel library for the ATSHA204. I am using Atmel Studio 6.1 (beta).

// include necessary libraries from Arduino and Atmel for ATMEGA328p 
#include <Arduino.h> 
#include <Wire.h> 
#include <Wire.cpp> 
#include <twi.h> 
#include <twi.c> 
#include <sha204_lib_return_codes.h> 
#include <timer_utilities.h> 
#include <timer_utilities.c> 
#include <sha204_physical.h> 
#include <i2c_phys.h> 
#include <i2c_phys.c> 
#include <sha204_i2c.c> 
#include <sha204_comm.h> 
#include <sha204_comm.c> 

// result of functions 
volatile uint8_t ret_code; 

// counter for response array 
volatile uint8_t i; 

// e.g. 4 bytes 
static uint8_t response[SHA204_RSP_SIZE_MIN]; 
void setup() { 
    // open Arduino for serial output 
    Serial.begin(9600); 
    
    // Make Arduino a Master on the I2C bus 
    Wire.begin(); 
    
    // Make ATSHA204 a slave on the I2C bus 
    sha204p_init(); 
    
     // initialize response array 
     for (i = 0; i < sizeof(response); i++) 
     response[i] = 0; 
    
    // re-sync comm 
    ret_code=sha204p_resync(sizeof(response),&response[0]); 
    
    // force it to sleep 
    ret_code=sha204p_sleep(); 
    Serial.println("Result of Sleep Command:"); 
    Serial.println(ret_code,HEX); 
    
    // wake it up 
    
    // 0 out response array 
    for (i = 0; i < sizeof(response); i++) 
    response[i] = 0; 
    
    // wake command 
    ret_code=sha204c_wakeup(&response[0]); 
    Serial.println("Result of Wakeup Command:"); 
    Serial.println(ret_code,HEX); 
    
    // we are done 
    Serial.end(); 
} 
void loop() {         
}

Here are results in Arduino serial monitor

First my sleep command fails (returns comm failure F0)

Next my wakeup command does not fail but returns this: E7 which means:

"Not an error while the Command layer is polling for a command response.

I should be geting 0x00 success message instead

2

Its resolved here, related to setting the right clock speed in arduino uno.

Here is a reference: http://www.avrfreaks.net/index.php?name … &p=1066555