Envoi de la temperature vers la raspberry (fonctionnel)

lahouass
1 parent 27187418
Showing 1 changed file with 115 additions and 0 deletions Show diff stats
Tuno_to_rpi.c
@@ -0,0 +1,115 @@
+#include <avr/io.h>			// for the input/output register
+#include <avr/interrupt.h> 	
+#include <util/delay.h>  
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#define PRESCALER 1024
+#define TIME_SLOT 20
+#define BAUDRATE	103
+
+#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
+#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
+
+char Donnee[24];
+float temp;
+
+void init_serial(void)
+{
+	/* ACHTUNG : we suppose UBRR value < 0xff */
+	/* Not true in all case */
+	uint8_t baudrate = BAUDRATE;
+	/* Set baud rate */
+	UBRR0H = 0;
+	UBRR0L = baudrate;
+	/* Enable transmitter *///task_led_red();
+      //task_send_serial('A');
+	UCSR0B = (1<<TXEN0);
+	/* Set frame format */
+	UCSR0C = 0x06;
+    
+}
+
+void send_serial(unsigned char c)
+{
+	loop_until_bit_is_set(UCSR0A, UDRE0);
+	UDR0 = c;
+}
+
+
+void send_msg2(char Donnee[]){
+ 
+    while (( UCSR0A & (1<<UDRE0))  == 0){};
+            
+            for (int i = 0; i < strlen(Donnee); i++){ 
+                while (( UCSR0A & (1<<UDRE0))  == 0){};
+                UDR0 = Donnee[i]; 
+                if (i == (strlen(Donnee) - 1)){
+                    send_serial('\n');
+                    send_serial('\r');
+                }
+            } 
+}
+
+void send_msg(char Donnee[]){
+        int i=0;
+      for(i=0; i<strlen(Donnee); i++){
+          if (i==strlen(Donnee)-1){
+              send_serial(Donnee[i]);
+              send_serial('\n');
+              send_serial('\r');
+        }
+          else{
+              send_serial(Donnee[i]);
+        } 
+        _delay_ms(100);
+        }
+}
+
+
+// équivalent de analogueRead()
+int analogReadNew(uint8_t pin) {
+  /*
+  // Définition de la référence de tension
+  ADMUX |= (1 << REFS0);
+  // On sélectionne notre pin
+  ADMUX |= pin & 0x07;
+  
+  // On lance la conversion
+  sbi(ADCSRA, ADSC);
+
+  // Le bit sera désactivé à la fin de la conversion
+  while(bit_is_set(ADCSRA, ADSC));
+
+  // Lire ADCL en premier est obligatoire, sinon l'ADC se bloque
+  uint8_t low = ADCL;
+
+  // Récupérer le résultat
+  return ((ADCH << 8) | low);
+  */
+  ADCSRA |= (1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);
+  ADMUX |= (1<<REFS0)|(1<<ADLAR);
+  ADMUX = (ADMUX&0xf0)|pin;
+  ADCSRA |= (1<<ADEN);
+  
+  ADCSRA |= (1<<ADSC);
+  while(bit_is_set(ADCSRA, ADSC));
+  return ADCH;
+}
+
+int main()
+{
+   int reading;
+   init_serial();
+   while(1){
+    reading=analogReadNew(0);
+    temp = reading * 1.9607843;
+    dtostrf(temp, 4, 1, Donnee);
+    send_serial('T');
+    send_serial('=');
+    send_msg2(Donnee);
+    _delay_ms(2000);
+   }
+   return 0;  
+}
+