Queue buffer for STM32

buf.c

#define BUF_SIZE 16

enum {
	BUF_INSERT_SUCCESS = 0
	BUF_ERR_FULL
}

int8_t buf[BUF_SIZE];
uint8_t front = 0;
uint8_t rear = 0;
uint8_t len = 0

uint8_t queue(int8_t data) {
	if (len == BUF_SIZE) return BUF_ERR_FULL;

	buf[rear] = data;
	len++;
	rear = rear + 1 == BUF_SIZE ? 0 : rear + 1

	return BUF_INSERT_SUCCESS;
}

int8_t dequeue() {
	if (len == 0) return 0;

	uint8_t temp = front;
	len--;
	front = front + 1 == BUF_SIZE ? 0 : front + 1

	return buf[temp]
}