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Complete lab report

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Blizzard Finnegan 2024-02-07 15:57:29 -05:00
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# Experiment Set #3
## Exercises 5-8
### Blizzard Finnegan
5. Analyse Access Contention Problems
```c
/*USER CODE BEGIN PV*/
int StartFlag = 1;
/*USER CODE END PV*/
/* USER CODE BEGIN 4*/
void AccessFunction(){
if(StartFlag == 1){
StartFlag = 0;
} else {
HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_15);
}
for(int i = 0; i < 2000000; i++);
StartFlag = 1;
return;
}
/* USER CODE END 4*/
void StartFlashGreenLedTask(void const * argument)
{
/* USER CODE BEGIN 5 */
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_SET);
AccessFunction();
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_RESET);
osDelay(500);
}
/* USER CODE END 5 */
}
void StartFlashRedLedTask(void const * argument)
{
/* USER CODE BEGIN StartFlashRedLedTask */
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_SET);
AccessFunction();
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_RESET);
osDelay(100);
}
/* USER CODE END StartFlashRedLedTask */
}
```
6. Eliminate Resource Contention By Suspending the Scheduler
```c
/*USER CODE BEGIN PV*/
int StartFlag = 1;
/*USER CODE END PV*/
/* USER CODE BEGIN 4*/
void AccessFunction(){
if(StartFlag == 1){
StartFlag = 0;
} else {
HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_15);
}
for(int i = 0; i < 2000000; i++);
StartFlag = 1;
return;
}
/* USER CODE END 4*/
void StartFlashGreenLedTask(void const * argument)
{
/* USER CODE BEGIN 5 */
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_SET);
taskENTER_CRITICAL();
AccessFunction();
taskEXIT_CRITICAL();
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_RESET);
osDelay(500);
}
/* USER CODE END 5 */
}
void StartFlashRedLedTask(void const * argument)
{
/* USER CODE BEGIN StartFlashRedLedTask */
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_SET);
taskENTER_CRITICAL();
AccessFunction();
taskEXIT_CRITICAL();
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_RESET);
osDelay(100);
}
/* USER CODE END StartFlashRedLedTask */
}
```
7. Demonstrate Deterioration in System Performance
```c
/*USER CODE BEGIN PV*/
int StartFlag = 1;
/*USER CODE END PV*/
/* USER CODE BEGIN 4*/
void AccessFunction(){
if(StartFlag == 1){
StartFlag = 0;
} else {
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_15,GPIO_PIN_SET);
}
for(int i = 0; i < 2000000; i++);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_15,GPIO_PIN_RESET);
StartFlag = 1;
return;
}
/* USER CODE END 4*/
void StartFlashGreenLedTask(void const * argument)
{
/* USER CODE BEGIN 5 */
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_SET);
taskENTER_CRITICAL();
AccessFunction();
taskEXIT_CRITICAL();
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_RESET);
osDelay(500);
}
/* USER CODE END 5 */
}
void StartFlashRedLedTask(void const * argument)
{
/* USER CODE BEGIN StartFlashRedLedTask */
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_SET);
taskENTER_CRITICAL();
AccessFunction();
taskEXIT_CRITICAL();
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_RESET);
osDelay(100);
}
/* USER CODE END StartFlashRedLedTask */
}
void StartFlashOrangeLED(void const * argument)
{
/* USER CODE BEGIN StartFlashOrangeLED */
/* Infinite loop */
for(;;)
{
HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_13);
osDelay(50);
}
/* USER CODE END StartFlashOrangeLED */
}
```
8. Evaluate priority preemptive scheduling policies.
```c
/*USER CODE BEGIN PV*/
int StartFlag = 1;
/*USER CODE END PV*/
/* USER CODE BEGIN 4*/
void AccessFunction(){
if(StartFlag == 1){
StartFlag = 0;
} else {
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_15,GPIO_PIN_SET);
}
for(int i = 0; i < 2000000; i++);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_15,GPIO_PIN_RESET);
StartFlag = 1;
return;
}
/* USER CODE END 4*/
void StartFlashGreenLedTask(void const * argument)
{
/* USER CODE BEGIN 5 */
uint32_t WaitTimeMilliseconds = 550;
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_SET);
osSemaphoreWait(CriticalResourceSemaphoreHandle,WaitTimeMilliseconds);
AccessFunction();
osSemaphoreRelease(CriticalResourceSemaphoreHandle);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,GPIO_PIN_RESET);
osDelay(500);
}
/* USER CODE END 5 */
}
void StartFlashRedLedTask(void const * argument)
{
/* USER CODE BEGIN StartFlashRedLedTask */
uint32_t WaitTimeMilliseconds = 200;
/* Infinite loop */
for(;;)
{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_SET);
osSemaphoreWait(CriticalResourceSemaphoreHandle,WaitTimeMilliseconds);
AccessFunction();
osSemaphoreRelease(CriticalResourceSemaphoreHandle);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,GPIO_PIN_RESET);
osDelay(100);
}
/* USER CODE END StartFlashRedLedTask */
}
void StartFlashOrangeLED(void const * argument)
{
/* USER CODE BEGIN StartFlashOrangeLED */
/* Infinite loop */
for(;;)
{
HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_13);
osDelay(50);
}
/* USER CODE END StartFlashOrangeLED */
}
```

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