X-Git-Url: http://git.rot13.org/?p=Arduino-Nano-VA-meter;a=blobdiff_plain;f=main.c;h=b79f191c36f921d0ac3448baacea454d9710b7f9;hp=181cde59a73fbcb72f61d4c26ecdf102f5f142de;hb=a6d6ddef708bd8d085e2b66aceda37e0895abf88;hpb=0de40546845b778fc53b77aefcb749ac97761797;ds=sidebyside

diff --git a/main.c b/main.c
index 181cde5..b79f191 100644
--- a/main.c
+++ b/main.c
@@ -6,6 +6,9 @@
 #define USART_BAUDRATE 9600
 #define UBRR_VALUE (((F_CPU/(USART_BAUDRATE*16UL)))-1)
 
+// this will output only changes on serial
+#define SERIAL_CHANGES 0
+
 void serial_init(){
 	// initialize USART (must call this before using it)
 	UBRR0=UBRR_VALUE; // set baud rate
@@ -27,7 +30,7 @@ void serial_string(const char* s){
 
 void serial_break(){
 	serial_send(10); // new line 
-	serial_send(13); // carriage return
+//	serial_send(13); // carriage return
 }
 void serial_comma(){
 	serial_send(','); // comma
@@ -83,8 +86,11 @@ volatile uint8_t regC;
 volatile uint8_t regD;
 
 // these values will hold the current/voltage value
-volatile char current[4];
-volatile char voltage[4];
+volatile char current[4] = "XXXX";
+volatile char voltage[4] = "XXXX";
+
+volatile int display_sum = 0;
+volatile int last_display_sum = 0;
 
 
 void read_capture(){
@@ -185,12 +191,24 @@ void capture_full(){
             if (capture_letter('1'+i)) {break;}
         }
     }
-    
+
+#if SERIAL_CHANGES
+    // don't send same values over serial
+    for(i=0;i<4;i++) {
+	    display_sum = voltage[i] + current[i];
+    }
+    if ( display_sum == last_display_sum ) {
+	    return;
+    } else {
+	    last_display_sum = display_sum;
+    }
+#endif
+
     for(i=0;i<4;i++) {
         serial_send(voltage[i]);
         if (i==1){serial_send('.');}
     }
-    serial_send(',');
+    serial_send(' ');
     for(i=0;i<4;i++) {
         serial_send(current[i]);
         if (i==2){serial_send('.');}