Hello,
I recently started programming AVR chips. I made a program to switch off a raspberry and it's power.
All seemed to be working perfect, but when the program has run for about 2 days in a row and I try ro switch it off, it will not react. After several attempts suddently the device reacts and shuts off. This again happens when I try to switch it back on. If I switch off the power, wait a couple of seconds and start up again it all works perfect.
This is my code, I'm using a ATtiny25.
Moderetors note : used code tags
I recently started programming AVR chips. I made a program to switch off a raspberry and it's power.
All seemed to be working perfect, but when the program has run for about 2 days in a row and I try ro switch it off, it will not react. After several attempts suddently the device reacts and shuts off. This again happens when I try to switch it back on. If I switch off the power, wait a couple of seconds and start up again it all works perfect.
This is my code, I'm using a ATtiny25.
C:
---------------------------------------------------------------------------
#define F_CPU 1000000UL // 1Mhz
#include <avr/io.h>
#include <util/delay.h>
int button_pressed_counter = 0;
bool button_pressed()
{
bool a = !(PINB & (1 << PB3));
if (a)
button_pressed_counter++;
else
button_pressed_counter = 0;
if (button_pressed_counter >= 10)
{
button_pressed_counter = 0;
return true;
}
return false;
}
bool temp_shutdown()
{
bool a = (PINB & (1 << PB0));
if (a)
{
return true;
}
else
return false;
}
int main(void)
{
DDRB |= (1 << DDB1); //raspberry power 5V
DDRB |= (1 << DDB2); //lcd power 12V
DDRB &= ~(1 << DDB0); //'sf' Temp. shutdown feedback Rasp
DDRB &= ~(1 << DDB3); //button on/off
PORTB |= (1 << PINB3); //pullup for button
DDRB |= (1 << DDB4); //shutdown signal for raspberry
bool rasp_on = false;
bool lcd_on = false;
bool shutdown_signal = false;
int state = 0;
int lcd_counter = 0;
int second_counter = 0;
int shutdown_counter = 0;
while(true)
{
switch (state)
{
case 0: //Power on
rasp_on = true;
lcd_counter++;
if (lcd_counter >= 300)
{
rasp_on = true;
lcd_on = true;
second_counter++;
if (second_counter >=100)
{
if (button_pressed())
{
second_counter = 0;
lcd_counter = 0;
state = 1;
}
if (temp_shutdown())
{
second_counter = 0;
lcd_counter = 0;
state = 1;
}
break;
}
break;
}
break;
case 1: //Shutdown
rasp_on = true;
lcd_on = false;
shutdown_counter++;
if (shutdown_counter >= 250)
{
shutdown_counter = 0;
state = 2;
}
break;
case 2: //Power off
rasp_on = false;
lcd_on = false;
second_counter++;
if (second_counter >= 100)
{
if (button_pressed())
{
second_counter = 0;
state = 0;
}
break;
}
break;
}
//rasp switched_on
if (rasp_on)
PORTB &= ~(1<<PB1);
else
PORTB |= (1<<PB1);
//lcd switched_on
if (lcd_on)
PORTB |= (1<<PB2);
else
PORTB &= ~(1<<PB2);
//Shutdown signal for Raspberry Pi
shutdown_signal = state == 1;
if (shutdown_signal)
PORTB |= (1<<PB4);
else
PORTB &= ~(1<<PB4);
_delay_ms(100);
}
}
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