complete homework 4

1 files changed, 16 insertions, 0 deletions

diff --git a/project/Core/Src/System/systick.c b/project/Core/Src/System/systick.c
index 263defd..58ee2b1 100644
--- a/project/Core/Src/System/systick.c
+++ b/project/Core/Src/System/systick.c
@@ -1,5 +1,9 @@
 #include "systick.h"
 
+systick_t *get_systick() {
+	return (systick_t *) 0xE000E010;
+}
+
 // This function is to Initialize SysTick registers
 void init_systick()
 {
@@ -10,6 +14,12 @@ void init_systick()
 	// Set the LOAD (RVR) to 8 million to give us a 100 milliseconds timer.
 	// Set the clock source bit in the CTRL (CSR) to the internal clock.
 	// Set the enable bit in the CTRL (CSR) to start the timer.
+	systick_t *s = get_systick();
+
+	s->CSR = 0;
+	s->RVR = 8000000;
+	s->CSR |= 1<<2;
+	s->CSR |= 1;
 }
 
 // This fuction is to create delay using SysTick timer counter
@@ -20,4 +30,10 @@ void delay_systick()
 	// Inside that for loop check the COUNTFLAG bit in the CTRL (CSR)
 	// register in a loop. When that bit is set exit this inner loop
 	// to do another pass in the outer loop of 10.
+	systick_t *s = get_systick();
+
+	for (int i = 0; i < 10; i++) {
+		while (~s->CSR & (1<<16))
+			;
+	}
 }