test/timer2: test delay function, compare different implementations

tenbaht · tenbaht · commit c8c7a0e14370 · 2016-12-20T12:44:42.000+01:00
diff --git a/test/timer2/timer2.c b/test/timer2/timer2.c
@@ -1,33 +1,118 @@
 /*
- * test timer4: show the value for millis() over time and use the 
- * delay() function
+ * test timer4: show the value for millis() over time and compare
+ * different impementations for the delay() function
  */
 
 #include "Arduino.h"
-#include "HardwareSerial.h"
-#include "Print.h"
+#include "Serial.h"
 
 
 uint32_t prev=0;
 
-
 void mydelay(unsigned long ms)
+#if 1
+{
+	// 88 bytes
+	uint16_t start;
+
+	start = (uint16_t) micros();
+
+	while (ms > 0) {
+		while ( (ms > 0) && (((uint16_t)micros() - start) >= 1000)) {
+			ms--;
+			start += 1000;
+		}
+
+	}
+}
+#endif
+#if 0
+{
+	// 92 bytes
+	uint16_t start, now;
+
+	start = (uint16_t) micros();
+
+	while (ms > 0) {
+
+		now = (uint16_t) micros();
+		while ( (ms > 0) && ((now - start) >= 1000)) {
+			ms--;
+			start += 1000;
+		}
+
+	}
+}
+#endif
+#if 0
+{
+	// 100 bytes
+	uint16_t start, passed;
+
+	start = (uint16_t) micros();
+
+	while (ms > 0) {
+
+		passed = (uint16_t) micros() - start;
+		while ( (ms > 0) && (passed >= 1000)) {
+			ms--;
+			passed -= 1000;
+			start += 1000;
+		}
+
+	}
+}
+#endif
+#if 0
+{
+	// 159 bytes
+	uint32_t start, passed;
+
+	start = micros();
+	while (ms > 0) {
+		passed = micros() - start;
+		while ( (ms > 0) && (passed >= 1000)) {
+			ms--;
+			passed -= 1000;
+			start += 1000;
+		}
+	}
+}
+#endif
+#if 0
 {
+	// 131 bytes
 	uint32_t start = micros();
 
 	while (ms > 0) {
-//		yield();
-		while ( ms > 0 && (micros() - start) >= 1000) {
+		while ( (ms > 0) && ((micros() - start) >= 1000)) {
 			ms--;
 			start += 1000;
 		}
 	}
 }
+#endif
+#if 0
+{
+	// 131 bytes
+	uint32_t start = micros();
 
+	while (ms > 0) {
+		while ( ms > 0 && (micros() - start) >= 1000) {
+			ms--;
+			start += 1000;
+		}
+	}
+}
+#endif
 
 void setup(void)
 {
-    HardwareSerial_begin(115200);
+	Serial_begin(115200);
+
+	Serial_print_s("testing delay functions.\n"
+		"Code size of current impementation: ");
+	Serial_println_u((uint16_t)setup - (uint16_t)mydelay);
 }
 
 
@@ -36,14 +121,14 @@ void loop (void)
 	uint32_t now;
 
 	now = millis();
-	Print_print_s("millis()=");
-	Print_print_u(now);
-	Print_print_s("\tdelta=");
-	Print_print_u(now-prev);
-	Print_print_s("\tmicros()=");
-	Print_print_u(micros());
-	Print_print_s("\tTIM4_CNTR=");
-	Print_println_u(TIM4->CNTR);
+	Serial_print_s("millis()=");
+	Serial_print_u(now);
+	Serial_print_s("\tdelta=");
+	Serial_print_u(now-prev);
+	Serial_print_s("\tmicros()=");
+	Serial_print_u(micros());
+	Serial_print_s("\tTIM4_CNTR=");
+	Serial_println_u(TIM4->CNTR);
 
 	prev = now;
 	mydelay(1000);
