New version with PRNG numbers for challenge response

master
Wilhelm Westermark 8 years ago
parent 5afa7988fc
commit 46cddf2792

@ -1,48 +1,59 @@
/* I2C Echo Example */
#include "../I2CSlave/I2CSlave.h"
#include "../avr-i2c-slave/I2CSlave.h"
#include <util/delay.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#define I2C_ADDR 0x20
volatile uint8_t data;
volatile uint8_t final;
volatile uint8_t send=0;
void I2C_received(uint8_t received_data)
{
data = received_data;
}
void I2C_requested()
{
I2C_transmitByte(data);
void I2C_requested() {
I2C_transmitByte(send);
}
void I2C_challenge() {
I2C_transmitByte(data*3);
I2C_transmitByte(send);
}
void setup()
{
void setup() {
// set received/requested callbacks
I2C_setCallbacks(I2C_received, I2C_requested);
// init I2C
I2C_init(I2C_ADDR);
// init output gpio
DDRB = 0b00000001;
}
DDRC = 0b00000100; // PC2
TCNT1 = 0;
TCCR1B |= (1 << CS10) | (1 << CS11); // No prescaling
int main()
{
}
int main() {
setup();
int challenge = 0;
unsigned int i = 0;
// Main program loop
while(1) {
if(data != 4) {
if(data == 1) {
i = TCNT1;
srand(i);
send = rand();
while(data != send+3) {
I2C_challenge();
}
else {
//PORTB |= 1<<1;
data = 2;
I2C_requested();
send = 17;
I2C_challenge();
PORTC |= 2<<1;
_delay_ms(5000);
PORTC = 0;
data = 0;
}
}/* else {
send = 0;
I2C_challenge();
}*/
}
}

@ -9,7 +9,7 @@ MCU = atmega328p
FORMAT = ihex
TARGET = main
SRC = $(TARGET).c \
I2CSlave.c
../avr-i2c-slave/I2CSlave.c
ASRC =
OPT = s

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