Added README for AVR

master
Wilhelm Westermark 7 years ago
parent 13ea7e7daa
commit 41c4b0ca40

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This code is made to run on an atmega328p using the library avr-i2c-slave (https://github.com/thegouger/avr-i2c-slave.git)
I included my avrdude.conf for easy building.
On Debian you need:
avrdude
gcc-avr
Probably a lot other stuff I forgot.
Make sure you have the correct fuses, the correct name for you AVR and then run:
make
sudo make program

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#
# Makefile:
#################################################################################
#DEBUG = -g -O0
DEBUG = -O3
CC = gcc
INCLUDE = -I/usr/local/include
CFLAGS = $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
LDFLAGS = -L/usr/local/lib
LDLIBS = -lwiringPi -lwiringPiDev -lpthread -lm
# Should not alter anything below this line
###############################################################################
SRC = i2c_challenge.c \

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This code needs wiringPi
Compile it by running make i2c_challenge

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O/*
*i2ctest.c
* Raspberry Pi I2C test using wiringPi library.
*
*Copyright (c) Nahid Alam. <nahid.mahfuza.alam@gmail.com>
***********************************************************
*i2ctest is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* i2ctest is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
***********************************************************
*/
#include <stdio.h>
#include <wiringPi.h>
#include <wiringPiI2C.h>
int main (int argc, char *argv[])
{
int fd;
int data;
int send=1;
wiringPiSetup () ;
fd=wiringPiI2CSetup (0x20) ; /*Use i2cdetect command to find your respective device address*/
if(fd==-1)
{
printf("Can't setup the I2C device\n");
return -1;
}
else
{
while(data != 6) {
wiringPiI2CWrite(fd, send);
data=wiringPiI2CRead(fd);
if(data==-1)
{
printf("No data\n");
//return -1;
}
else if(data == send*3) {
printf("Sending challenge");
wiringPiI2CWrite(fd, 4);
}
else if(data == 6) {
printf("Read proper response \n");
break;
}
else
{
//print data
printf("Waiting to send challenge");
}
printf(" data=%d\n", data);
}
}
return 0;
}
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