Unable to enter into a particular switch case - c

Question

The first case of switch is to initialize the values, when i enter into the function the switch is not going to case INI_QUEUE, instead its going to CHECK_QUEUE or ENABLE_QUEUE.
below is my code and debug snippet.
can anyone please tell me, what is the problem which is making it not to go to INI_QUEUE
main.c file
int main(void)
{
/* USER CODE BEGIN 1 */
char buffer[2] = { 0 };
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_TIM14_Init();
/* USER CODE BEGIN 2 */
// HAL_TIM_Base_Start_IT(&htim14);
__HAL_UART_ENABLE_IT(&huart2,UART_IT_RXNE);
// HAL_UART_Receive_IT(&huart2, (uint8_t*) buffer, 1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
// HAL_UART_Receive_IT(&huart2, (uint8_t*) buffer, 1);
fn_cirQ();
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
typedef enum{
INI_QUEUE, CHECK_COM, EN_QUEUE, DE_QUEUE, UART_SEND
}Qstate;
void init_queue(queues *q, int max_size){
q->size =max_size;
q->values = malloc(sizeof(int)*q->size);
q->num = 0;
q->front = 0;
q->rare = 0;
}
void fn_cirQ()
{
queues q1;
static Qstate queuestates = INI_QUEUE;
switch (queuestates)
{
case INI_QUEUE:
init_queue(&q1, SIZE);
queuestates = CHECK_COM;
break;
case CHECK_COM:
if(Q_state == 0xFF)
{
queuestates = EN_QUEUE;
}
else if(Q_state == 0x00)
{
queuestates = DE_QUEUE;
}
else if(Q_state != 0x55)
{
HAL_UART_Transmit_IT(&huart2, (uint8_t*) errormsg, 20);
}
break;
case EN_QUEUE:
en_queue(&q1, temp[1]);
Q_state = 0x55;
j = 0;
queuestates = UART_SEND;
break;
case DE_QUEUE:
dequeue(&q1);
Q_state = 0x55;
j=0;
queuestates = UART_SEND;
break;
case UART_SEND:
HAL_UART_Transmit_IT(&huart2, (uint8_t*)&q1, sizeof(q1));
queuestates = CHECK_COM;
break;
}
}
[debug window,queuestates is assigned with CHECK_COM state instead of INI_QUEUE]

Answer 1

The initialization of a static variable is only done once, at program start-up. So the first time the function is called, it will go to the INI_QUEUE case.
From there on, any next time the function is called it will go the queue state set by the previous call.
But the first time it will go to INI_QUEUE.