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#include <avr/io.h> // for the input/output register
// For the serial port
#define CPU_FREQ 16000000L // Assume a CPU frequency of 16Mhz
void init_serial(int speed)
{
/* Set baud rate */
UBRR0 = CPU_FREQ/(((unsigned long int)speed)<<4)-1;
/* Enable transmitter & receiver */
UCSR0B = (1<<TXEN0 | 1<<RXEN0);
/* Set 8 bits character and 1 stop bit */
UCSR0C = (1<<UCSZ01 | 1<<UCSZ00);
/* Set off UART baud doubler */
UCSR0A &= ~(1 << U2X0);
}
void send_serial(unsigned char c)
{
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c;
}
unsigned char get_serial(void) {
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
}
// For the AD converter
void ad_init(unsigned char channel)
{
ADCSRA|=(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);
ADMUX|=(1<<REFS0)|(1<<ADLAR);
ADMUX=(ADMUX&0xf0)|channel;
ADCSRA|=(1<<ADEN);
}
//récupère la valeur de l'ADCH
unsigned int ad_sample(void){
ADCSRA|=(1<<ADSC);
while(bit_is_set(ADCSRA, ADSC));
return ADCH;
}
// For the I/O
void output_init(void){
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DDRB |= 0b00011111; // PIN 8-13 as output
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}
void output_set(unsigned char value){
if(value==0) PORTB &= 0xfe; else PORTB |= 0x01;
}
void input_init(void){
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DDRD |= 0x7c; // PIN 2-6 as input (Bouton Joystick + boutons)
DDRC |= 0x03; // PIN 0-1 analogiques comme input (x et y joystick analogique)
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}
unsigned char input_get(void){
return ((PIND&0x04)!=0)?1:0;
}
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void commande_leds(){
unsigned char temp_serial, leds;
temp_serial = get_serial();
if (temp_serial !=0){
leds = temp_serial;
if (leds == 65) PORTB = PORTB | 0x01;
if (leds == 66) PORTB = PORTB | 0x02;
if (leds == 67) PORTB = PORTB | 0x04;
if (leds == 68) PORTB = PORTB | 0x08;
if (leds == 69) PORTB = PORTB | 0x10;
if (leds == 70) PORTB = PORTB | 0x20;
if (leds == 97) PORTB = PORTB & 0xfe;
if (leds == 98) PORTB = PORTB & 0xfd;
if (leds == 99) PORTB = PORT B & 0xfb;
if (leds == 100) PORTB = PORT B & 0xf7;
if (leds == 101) PORTB = PORT B & 0xef;
if (leds == 102) PORTB = PORT B & 0xdf;
}
}
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// Dummy main
int main(void){
init_serial(9600);
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output_init();
input_init();
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unsigned char boutons, boutons_anc;
unsigned char joystick_x, joystick_x_anc;
unsigned char joystick_y, joystick_y_anc;
boutons_anc = PORTD & 0x7C;
ad_init(0);
joystick_x_anc = ad_sample();
ad_init(1);
joystick_y_anc = ad_sample();
while(1){
boutons = PORTD & 0x7C;
ad_init(1);
joystick_x = ad_sample();
ad_init(0);
joystick_y = ad_sample();
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if (boutons_anc != boutons) send_serial(boutons);
if ((joystick_x_anc != joystick_x) || (joystick_y_anc != joystick_y){
send_serial(joystick_x);
send_serial(joystick_y);
}
commande_leds();
}
return 0;
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}
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