diff --git a/Group21_Lab06_Task1/main.c b/Group21_Lab06_Task1/main.c
index 31d27d7..1a11395 100644
--- a/Group21_Lab06_Task1/main.c
+++ b/Group21_Lab06_Task1/main.c
@@ -16,4 +16,14 @@ void GPIO_PORT_F_init(void)
     GPIO_PORTF_IBE_R = 0x00;            // Trigger on one edge
     GPIO_PORTF_IEV_R = 0x00;            // Falling edge event
     GPIO_PORTF_IM_R |= 0x11;            // Unmask interrupts for PF0 and PF4
-}
\ No newline at end of file
+}
+#define STCTRL *((volatile uint32_t *) 0xE000E010)              // Control and status
+#define STRELOAD *((volatile uint32_t *) 0xE000E014)            // Reload value
+#define STCURRENT *((volatile uint32_t *) 0xE000E018)           // Current value
+
+#define COUNT_FLAG (1 << 16)                                    // Bit 16 of CSR automatically set to 1
+#define ENABLE (1 << 0)                                         // Bit 0 of CSR to enable the timer
+#define CLKINT (1 << 2)                                         // Bit 2 of CSR to specify CPU clock
+#define CLOCK_HZ 16000000                                       // Clock frequency of EK-TM4C123GXL
+#define INTEN (1 << 1)                                          // Bit 1 of CSR to enable interrupt
+#define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1) // SysTick reload value in microseconds based on clock frequency