diff --git a/labW6barnestr/Src/piezoSpeaker.c b/labW6barnestr/Src/piezoSpeaker.c
index 94dbf3a..99ab157 100644
--- a/labW6barnestr/Src/piezoSpeaker.c
+++ b/labW6barnestr/Src/piezoSpeaker.c
@@ -67,8 +67,8 @@ Note songFG[77] = {
 	{E4, E}, {r, E}, {G4, E}, {r, S}, {G4, S}, {E4, E}, {C4, E}, {r, Q},
 	{A3, E}, {r, E}, {C4, E}, {r, S}, {A3, S}, {E4, E}, {D4, E}, {r, Q},
 	{G5, S}, {Gb5, S}, {G5, E+(Q*3)},
-	{r , E}, {F5, E}, {E5, E}, {F5, E}, {E5, E}, {C5, E}, {A4, E}, {G4, E+(Q*5)}, 
-	{r,  E},
+	{r , E}, {F5, E}, {E5, E}, {F5, E}, {E5, E}, {C5, E}, {A4, E}, 
+	{G4, E+(Q*5)}, {r,  E},
 	{C5, E}, {B4, E}, {D5, E}, {A5, E}, {G5, E+W+E}, {r,  E},
 	{A5, E}, {B5, E}, {A5, E}, {G5, E}, {F5, E}, {E5, E}, {D5, E}, {E5, Q}, 
 	{C5, E}, {G4, E+(Q*3)}, {r,  E},
@@ -167,7 +167,8 @@ void TIM4_IRQHandler(void) {
 		// Delay for duration of note
 
 		//delay_1ms(noteToPlay.noteDuration);
-
+		// Instead of delay, have timer count to loaded value
+		// Then trigger interrupt when count value has been reached
 
 		// Load timer with value of note duration
 		//currentNote = currentSong[currentNoteIndex];
diff --git a/labW9barnestr/Inc/tasker.h b/labW9barnestr/Inc/tasker.h
index 6456f05..90afa1c 100644
--- a/labW9barnestr/Inc/tasker.h
+++ b/labW9barnestr/Inc/tasker.h
@@ -11,6 +11,94 @@
 
 #include <inttypes.h>
 
+// RCC
+typedef struct {
+	uint32_t CR;
+	uint32_t PLL_CFGR;
+	uint32_t CFGR;
+	uint32_t CIR;
+	uint32_t AHB1RSTR;
+	uint32_t AHB2RSTR;
+	uint32_t AHB3RSTR;
+	uint32_t _RESERVED_1_;
+	uint32_t APB1RSTR;
+	uint32_t APB2RSTR;
+	uint32_t _RESERVED_2_;
+	uint32_t _RESERVED_3_;
+	uint32_t AHB1ENR;
+	uint32_t AHB2ENR;
+	uint32_t AHB3ENR;
+	uint32_t _RESERVED_4_;
+	uint32_t APB1ENR;
+	uint32_t APB2ENR;
+	uint32_t _RESERVED_5_;
+	uint32_t _RESERVED_6_;
+} RCC;
+
+// GPIO
+typedef struct {
+	uint32_t MODER;
+	uint32_t OTYPER;
+	uint32_t OSPEEDER;
+	uint32_t PUPDR;
+	uint32_t IDR;
+	uint32_t ODR;
+	uint32_t BSRR;
+	uint32_t LCKR;
+	uint32_t AFRL;
+	uint32_t AFRH;
+} GPIO;
+
+typedef struct {
+	uint32_t CR1;     // Control Register 1
+	uint32_t CR2;     // Control Register 2
+	uint32_t SMCR;    // Slave Mode Control Register 
+	uint32_t DIER;    // DMA/Interrupt Enable Register
+	uint32_t SR;      // Status Register
+	uint32_t EGR;     // Event Generation Register
+	uint32_t CCMR1;   // Capture/Compare Mode Register 1
+	uint32_t CCMR2;   // Capture/Compare Mode Register 2
+	uint32_t CCER;    // Capture/Compare Enable Register 
+	uint32_t CNT;     // Counter
+	uint32_t PSC;     // Prescaler
+	uint32_t ARR;     // Auto-Reload Register
+	uint32_t _RESERVED_1_; 
+	uint32_t CCR1;    // Capture/Compare Register 1
+	uint32_t CCR2;    // Capture/Compare Register 2
+	uint32_t CCR3;    // Capture/Compare Register 3
+	uint32_t CCR4;    // Capture/Compare Register 4
+	uint32_t _RESERVED_2_;
+	uint32_t DCR;     // DMA Control Register
+	uint32_t DMAR;    // DMA Address for Full Transfer
+	uint32_t TIM2_OR; // TIM2 Option Register
+	uint32_t TIM5_OR; // TIM5 Option Register
+} TIM;
+
+// Will have to include timer for task switching interrupt
+
+// SYSCFG
+typedef struct {
+	uint32_t MEMRMP;
+	uint32_t PMC;
+	uint32_t EXTICR1;
+	uint32_t EXTICR2;
+	uint32_t EXTICR3;
+	uint32_t EXTICR4;
+	uint32_t CMPCR;
+	uint32_t CFGR;
+} SYSCFG;
+
+// Interrupt 
+#define NVIC_ISER1 (volatile uint32_t*) 0xE000E104
+typedef struct {
+	uint32_t IMR;
+	uint32_t EMR;
+	uint32_t RTSR;
+	uint32_t FTSR;
+	uint32_t SWIER;
+	uint32_t PR;
+} EXTI;
+
 typedef enum{PAUSED, ACTIVE} task_state;
 
 #define SCB_ICSR 0xE000D04
@@ -29,8 +117,6 @@ typedef struct {
     task_state state;
 } Task;
 
-void SysTick_Init();
-
 void tasker_tick();
 
 void init_tasker(uint32_t total_tasks, uint32_t main_ticks);
diff --git a/labW9barnestr/Src/main.c b/labW9barnestr/Src/main.c
index 743e0e8..0f35220 100644
--- a/labW9barnestr/Src/main.c
+++ b/labW9barnestr/Src/main.c
@@ -1,7 +1,13 @@
 /**
  * @file main.c
  * @author Trevor Barnes
- * @brief 
+ * @brief Main driver for the task switching lab. Provides the code that 
+ * initlizes the tasker/tasks. Also initializes any components being used
+ * in the tasks.
+ * Experience: Although this lab is not finished, I could see how to go
+ * about implementing the task switching. Each requested task would have
+ * been intilialized and the program would continuously switch between
+ * each task for an alotted or infinite amount of time.
  * @version 0.1
  * @date 2022-02-11
  * 
@@ -14,10 +20,124 @@
 #include <string.h>
 #include <math.h>
 #include "uart_driver.h"
-#include "delay.h"
+#include "memory.h"
 #include "led.h"
+#include "delay.h"
+#include "piezoSpeaker.h"
 #include "tasker.h"
 
-int main(void) {
+#define F_CPU 16000000UL
 
+void printHelp() {
+	printf("*Commands*\n\r");
+	printf("'rmw {hex address}' - Reads mem at a given address\n\r");
+	printf("'wmw {hex address} {value}' - Writes the given value as a word to "
+		   "the given address\n\r");
+	printf("'dm {hex address} {length}' - Dumps the memory at a given address. "
+		   "Defaults to 16 B if no length is given\n\r");
+	printf("'ps {song choice}' - Plays a song with the given selection\n\r");
+	printf("'songs' - Prints info about each song selection\n\r");
+}
+void songInfo() {
+	printf("Type 1 or 2 to play a song!\n\r");
+	printf("Song 1: Imperial March from Star Wars\n\r");
+	printf("Song 2: Metropolis Theme from Ratchet & Clank\n\r");
+	printf("Song 3: Flower Garden from Yoshi's Island\n\r");
+}
+
+int main(void) {
+	init_usart2(57600, F_CPU);
+	piezo_init();
+	led_init();
+    // Entry point for each task
+    // TODO: Arbitrary values for now
+    uint32_t * t1 = 0;
+    uint32_t * t2 = 0;
+    // Setup tasks
+    init_tasker(2, 20);
+    // Init Knight Rider Lights
+    // TODO: Find out what values are reasonable to init with, arbitrary for now
+    init_task(1, 50, t1, 10);
+    // Init Music
+    init_task(2, 50, t2, 10);
+    // Constantly switch between tasks in forever loop
+
+    // Following will need to be moved and/or greatly altered
+	char line[50];
+	char command[10];
+	int address;
+	int data;
+	int length;
+	int songSelection;
+	char background;
+	for(;;) {
+		// Get command from user
+		fgets(line, 100, stdin);
+		// Parse only the command for strcmp
+		sscanf(line, "%s", command);
+		if (!strcmp(command, "help")) {
+			// Print Help
+			printHelp();
+		} else if (!strcmp(command, "songs")) {
+			// Print Song Info
+			songInfo();
+		} else if (!strcmp(command, "rmw")) {
+			// Read Memory
+			sscanf(line, "%s %X", command, &address);
+			readMem(address);
+		} else if (!strcmp(command, "wmw")) {
+			// Write Memory
+			sscanf(line, "%s %X %u", command, &address, &data);
+			writeMem(address, data);
+		} else if (!strcmp(command, "dm")) {
+			// Dump Memory
+			sscanf(line, "%s %X %u", command, &address, &length);
+			dumpMem(address, length);
+		} else if (!strcmp(command, "ps")) {
+			// Song Selection Command Format:
+			// "ps {songSelection} {background}"
+			sscanf(line, "%s %u %c", command, &songSelection, &background);
+			if (background == 'b') {
+				switch(songSelection) {
+				case 1:
+					printf("Playing Imperial March in the background\n\r");
+					play_song_br(songIM);
+					break;
+				case 2:
+					printf("Playing Metropolis Theme in the background\n\r");
+					play_song_br(songMT);
+					break;
+				case 3:
+					printf("Playing Flower Garden in the background\n\r");
+					play_song_br(songFG);
+					break;
+				default:
+					break;
+					printf("Invalid song selection\n\r");
+				}
+			} else {
+				// Without valid flag, program plays songs in foreground
+				switch(songSelection) {
+				case 1:
+					printf("Playing Imperial March\n\r");
+					play_song(songIM);
+					break;    
+				case 2:
+					printf("Playing Metropolis Theme\n\r");
+					play_song(songMT);
+					break;
+				case 3:
+					printf("Playing Flower Garden\n\r");
+					play_song(songFG);
+					break;
+				default:
+					break;
+					printf("Invalid song selection\n\r");
+				}
+			}
+			
+		} else {
+			printf("Invalid input, type 'help' for instructions\n\r");
+		}
+	}
 }
diff --git a/labW9barnestr/Src/tasker.c b/labW9barnestr/Src/tasker.c
index ea68653..6f0212b 100644
--- a/labW9barnestr/Src/tasker.c
+++ b/labW9barnestr/Src/tasker.c
@@ -13,11 +13,9 @@
 #include <inttypes.h>
 #include "tasker.h"
 
-void SysTick_Init() {
 
-}
-
-void init_task(uint32_t task_num, uint32_t stacksize, void(*entry_point)(void), uint32_t ticks) {
+void init_task(uint32_t task_num, uint32_t stacksize, void(*entry_point)(void),
+    uint32_t ticks) {
     tasks[task_num].stack_pointer = (uint32_t*)malloc(stacksize*sizeof(uint32_t));
     tasks[task_num].stack_pointer += stacksize;
     *(--tasks[task_num].stack_pointer) = 0x01000000; // PSR
@@ -61,10 +59,6 @@ void tasker_tick() {
     }
 }
 
-void SysTick_Handler(void) {
-    
-}
-
 void PendSV_Handler(void) {
     register uint32_t* stack_pointer asm("r13");
     asm volatile("push {r4-r11,lr}");