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labW3barnestr/Src/delay.c

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+/*
+ * delay.c
+ *
+ */
+
+#include <inttypes.h>
+#include "delay.h"  //include declaration header file
+
+void delay_ms(uint32_t n){
+
+	// 1ms = 16,000 ticks
+	for (int i = n ; i > 0 ; i--) {
+		// Clear value register
+		*STK_VAL = 0x0000;
+		// Store 16,000 in STK_LOAD
+		*STK_LOAD = 16000;
+		// Enable clock, no prescaler, no interrupt
+		*STK_CTRL |= CLKSOURCE;
+		*STK_CTRL |= EN;
+		// Loop n times: Wait for countflag high
+		int flag;
+		do {
+			flag = ((*STK_CTRL & (1<<16))>>16);
+		} while (flag != 1);
+	}
+
+}
+
+void delay_us(uint32_t n) {
+		// 1us = 16 ticks
+		for (int i = n ; i > 0 ; i--) {
+			// Clear value register
+			*STK_VAL = 0x0000;
+			// Store 16 in STK_LOAD
+			*STK_LOAD = 16;
+			// Enable clock, no prescaler, no interrupt
+			*STK_CTRL |= CLKSOURCE;
+			*STK_CTRL |= EN;
+			// Loop n times: Wait for countflag high
+			int flag;
+			do {
+				flag = ((*STK_CTRL & (1<<16))>>16);
+			} while (flag != 1);
+		}
+}