Update README.md

Example Source Code/AVR Example/README.md

@@ -19,5 +19,157 @@ The example of Co Operative Multitasking
   - Task3: Write High/Low on PIN A.2 with 50ms delay
   - Task4: Suspend the Task1 & Task4 after 20s
 
+- #### Code :
+```c++  
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "User Library/coop_core.h"
+
+/* ..... User Defines ..... */
+#define GPIO_WriteHigh(GPIO, PIN) ((GPIO) |= (1 << PIN))
+#define GPIO_WriteLow(GPIO, PIN)  ((GPIO) &= ~(1 << PIN))
+#define GPIO_Toggle(GPIO, PIN)    ((GPIO) ^= (1 << PIN))
+
+/* ..... User Tasks ..... */
+cTask_TypeDef Task1;
+cTask_TypeDef Task2;
+cTask_TypeDef Task3;
+cTask_TypeDef Task4;
+
+/* ..... Prototypes ..... */
+void Task1Func(uint8_t *argument);
+void Task2Func(uint8_t *argument);
+void Task3Func(uint8_t *argument);
+void Task4Func(uint8_t *argument);
+
+void GPIO_Init(void);
+void SysTickTimer_Init(void);
+
+int main(void)
+{
+
+	/* HW Init */
+	__asm__ ("sei"); // Enable Global Interrupt
+
+	GPIO_Init();
+	SysTickTimer_Init();
+
+	/* Register User Tasks */
+	Task_RegisterNew(&Task1, Task1Func);
+	Task_RegisterNew(&Task2, Task2Func);
+	Task_RegisterNew(&Task3, Task3Func);
+	Task_RegisterNew(&Task4, Task4Func);
+
+	/* Run CoOp System */
+	Task_RunCoOpSystem();
+
+	while (1) 
+	{
+	}
+}
+
+/* ..... User Tasks Code ..... */
+void Task1Func(uint8_t *argument)
+{
+	GPIO_Toggle(PORTA, 0);
+	Task_Delay(1000, 0); // 1000ms Delay with step 0
+}
+
+void Task2Func(uint8_t *argument)
+{
+	GPIO_Toggle(PORTA, 1);
+	Task_Delay(500, 0); // 500ms Delay with step 0
+}
+
+void Task3Func(uint8_t *argument)
+{
+	switch (*argument)
+	{
+		case 0: // Step 0 is default
+		{
+			GPIO_WriteHigh(PORTA, 2);
+			Task_Delay(50, 1); // Wait 50ms and goto step 1 (case 1)
+		}
+		break;
+		case 1: // Step 1
+		{
+			GPIO_WriteLow(PORTA, 2);
+			Task_Delay(50, 0); // Wait 50ms and goto step 0 (case 0)
+		}
+		break;
+
+		default:
+		break;
+	}
+
+}
+
+void Task4Func(uint8_t *argument)
+{
+
+	switch (*argument)
+	{
+		case 0: // Step 0 is default
+		{
+			Task_Delay(20000, 1); // Wait 20s and goto step 1 (case 1)
+		}
+		break;
+		case 1: // Step 1
+		{
+			Task_Suspend(&Task1); // Suspend Task1
+			Task_Suspend(&Task4); // Suspend Task4
+		}
+		break;
+		
+		default:
+		break;
+	}
+
+}
+
+/* ..... GPIO initialize ..... */
+void GPIO_Init(void)
+{
+
+	DDRA = 0x07; // Set PA.0 ~ PA.2 As Digital Output
+
+}
+
+/* ..... Timer initialize ..... */
+void SysTickTimer_Init(void)
+{
+
+	/* Set counter value for 1ms:
+
+		F_TIMER    = (CPU_CLK / TIMER_PRE)
+		COUNT_TIME = (1 / F_TIMER)
+		OVF_TIME   = COUNT_TIME * (Counter_Period - 1)
+
+		F_TIMER    = (1MHz / 8) = 125,000Hz
+		COUNT_TIME = (1 / 125,000) = 0.000008
+		OVF_TIME   = 1ms = (0.001 / 0.000008) - 1 = 124
+
+		COUNTER_PERIOD = 255 - 124 = 131
+
+	*/
+
+	TCNT0 = 131;  // Set Counter Period
+	TIMSK = 0x01; // Enable OVF Interrupt
+	TCCR0 = 0x02; // Set PRE to 8
+
+}
+
+/* ..... Timer 0 overflow interrupt ..... */
+ISR(TIMER0_OVF_vect)
+{
+	TCNT0 = 131;  // Set Counter Period
+
+	Task_IncTick();
+
+}
+
+``` 
+
 #### Developer: Majid Derhambakhsh