esp01s-serial-remote-controller

 #include "queue.h"
 
 void queue_init(queue_t *queue)
 {
     queue->head = 0;
     queue->tail = 0;
     queue->count = 0;
 
     for (uint8_t i = 0; i < QUEUE_LEN; ++i)
     {
         queue->data[i] = 0;
     }
 }
 
 void queue_enqueue(queue_t *queue, uint8_t value)
 {
     queue->data[queue->head] = value;
     queue->count += ((queue->count == QUEUE_LEN) ? 0 : 1);
     queue->head += ((queue->count == QUEUE_LEN) ? 0 : 1);
 }
 
 uint8_t queue_dequeue(queue_t *queue)
 {
     if (queue_is_empty(queue))
     {
         return 0;
     }
 
     queue->count--;
     return queue->data[queue->tail++];
 }
 
 uint8_t queue_peek(queue_t *queue)
 {
     return queue->data[queue->tail];
 }
 
 uint16_t queue_count(queue_t *queue)
 {
     return queue->count;
 }
 
 uint8_t queue_is_empty(queue_t *queue)
 {
     return (queue->count == 0);
 }