class done

lab7interrupts/Src/timer.s

@@ -0,0 +1,40 @@
+# main.s
+# Trevor Barnes
+# CE2801-031
+.syntax unified
+.cpu cortex-m4
+.thumb
+.section .text
+
+	.equ CCMR_OCC1M_PWM, 0x18
+	.equ CCMR_OC1PE, 1<<4
+	.equ AFRL_TIM3_CH1_EN, 1<<4
+	.equ AFRL_OFFSET, 0x20
+	.equ CCMR_OFFSET, 0x18
+	.equ TIM3_BASE, 0x24
+
+.global timerInit
+timerInit:
+	push {r0-r4, lr}
+    #Alt func low reg for TIM3
+    ldr r1, [r0, #AFRL_OFFSET]
+    bfc r1, #16, #4
+    orr r1, r1, #AFRL_TIM3_CH1_EN
+    str r1, [r0, #AFRL_OFFSET]
+
+    #Enable CCMR1 for preload and set pwm
+    #Allows for the modification of the pulse
+    ldr r0, =TIM3_BASE
+    ldr r1, [r0, #CCMR_OFFSET]
+    bfc r1, #4, #3
+    mov r2, #CCMR_OCC1M_PWM
+    orr r2, r2, #CCMR_OC1PE
+    orr r1, r1, r2
+    str r1, [r0, #CCMR_OFFSET]
+
+	#Enable CCER to for TIM3 (TIC)
+	#Every 10 seconds, sample
+
+
+	pop {r0, r4}
+	bx lr