Hi,
I have been trying to implement a piece of code but something strange is happening. Arduino is not resetting. Even though I don't have any code within the void loop() part the code is going into infinite loop. Even after the IDE shows done compiling, the L and TX LED keeps on blinking.
Can anybody tell me the reason behind this strange behavior.
I had a problem with this one time when I was messing around with the built in watchdog function. Can you post your code?
Please post your code...
while ( !( posted code)); // wait, possibly forever
# include <stdio.h>
unsigned char A[21] = {0X36,0X3E,0X34,0XE8,0X37,0X46,0X99,0XD4,0X68,0X11,0X99,0XA0,0X7E,0XD5,0XA2,0X86,0X62,0XA1,0XEB,0XF0,0X03};
unsigned char B[21] = {0XF1,0X24,0X73,0X79,0X0C,0X5C,0X1C,0XB1,0X45,0XD5,0XCD,0XA2,0X4F,0X09,0XA0,0X71,0X6C,0XBC,0X1F,0XD5,0X00};
unsigned char C[21] = {0X01,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00};
unsigned char T1[21];
unsigned char T2[21];
unsigned char D[21];
unsigned char E[21];
unsigned char F[21];
void add (unsigned char* number1, unsigned char* number2)
{
int i;
for (i=0; i<21; i++)
{
number2[i] = number1[i] ^ number2[i];
}
}
void sqr(unsigned char* number, unsigned char* output)
{
int i,m,k,t1,t2;
unsigned char pr[41];
for (i=0; i<41; i++)
{
k=4;
for (m=0; m<8; m+=2)
{
if ((i%2) != 0)
{
t2 = bitRead(number[(i-1)/2],k);
pr[i] = bitWrite(pr[i],m,t2);
k++;
}
else
{
t1 = bitRead(number[i/2],(m/2));
pr[i] = bitWrite(pr[i],m,t1);
}
}
}
for(i=0; i<21; i++)
{
output[i] = pr[i];
}
}
void mul(unsigned char *a, unsigned char *b, unsigned char *output)
{
int i,j,m,t,bi;
int x=0, y=0, z = 0;
unsigned char pr[41];
// first nested loop generating the first 4 columns
for (i=0; i<21; i++)
{
for (j=0; j<=i; j++)
{
for (m=0; m<8; m++)
{
bi = bitRead(b[i-j],m);
if (bi == 0)
{
t = 0;
}
else
t = a[j];
z = z ^ (t<<m);
}
x = x ^ z;
z = 0;
}
y = x>>8;
pr[i] = x&0XFF;
x = y;
}
// second nested loop generating the last 3 columns
for (i=21; i<41; i++)
{
for (j=i-20; j<21; j++)
{
for (m=0; m<8; m++)
{
bi = bitRead(b[i-j],m);
if (bi == 0)
{
t = 0;
}
else
t = a[j];
z = z ^ (t<<m);
}
x = x ^ z;
z = 0;
}
y = x>>8;
pr[i] = x&0XFF;
x = y;
}
pr[41] = y;
for(i=0; i<21; i++)
{
output[i] = pr[i];
}
}
void dble(unsigned char* number1, unsigned char* number2, unsigned char* number3,unsigned char* number4, unsigned char* number5, unsigned char* number6)
{
int i,j;
int test = 0;
unsigned char dummy1[21] = {0X01,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00};
/*for (j=0; j<21; j++)
{
if (number1[j] != dummy1[j])
{
test = 1;
break;
}
if (number2[j] != 0X00)
{
test = 1;
break;
}
}
Serial.println(test);
if (test == 0)
{
for (i = 0; i<21; i++)
{
number4[i] = dummy1[i];
number5[i] = 0X00;
number6[i] = 0X00;
}
return;
}
*/
sqr(number3, T1);
sqr(number1, T2);
mul(T1, T2, number6);
sqr(T2, number4);
sqr(T1, T1);
add(T2,number4);
sqr(number2, T1);
add(number6,T1);
add(T2,T1);
add(T1, number5);
}
void setup()
{
Serial.begin(115200);
int i;
dble(A, B, C, D, E, F);
for (i=20; i>=0; i--)
{
Serial.print(D[i], HEX);
Serial.print(" ");
}
Serial.print("\n");
for (i=20; i>=0; i--)
{
Serial.print(E[i], HEX);
Serial.print(" ");
}
Serial.print("\n");
for (i=20; i>=0; i--)
{
Serial.print(F[i], HEX);
Serial.print(" ");
}
}
void loop() {
}
In the void dble() function if I remove the comments in the commented out parts, the code is going into infinite loop and Arduino is not resetting. The TX led keeps on blinking.
If I keep the comments I am getting output. But If I close the serial monitor and open it again the output changes
I quick skim through doesn't show any obvious causes, but the symptoms suggest you're running out of memory or corrupting the memory. It may be that the corruption is occurring in a bit of code unrelated to the part you are commenting out.
Sounds like a cheap answer, but granted all those loops, I wouldn't be surprised if you are running out of memory.
What memory are you talking about? Is it the Flash memory or the RAM.
The shown binary sketch size is about 1%
RAM, you only have 2k to play with on a '328P.
I am working on Mega 2560. It has 8K RAM i guess. But anyways how can I minimise the memory size?