jebane stmy

void send_pc(char *format, ...) {
    char tmp_tab[128];
    int i;
    volatile int idx;
    idx = tx.head;

    va_list arglist;
    va_start(arglist, format);
    vsprintf(tmp_tab, format, arglist);
    va_end(arglist);

    for (i = 0; i < strlen(tmp_tab); i++) {
        tx.buff[idx] = tmp_tab[i];
        idx++;
        if (idx >= BUFF_SIZE) {
            idx = 0;
        }
    }
    __disable_irq();
    if ((tx.head != tx.tail)) {
        tx.head = idx;
        uint8_t tmp = tx.buff[tx.tail];
        HAL_UART_Transmit_IT(&huart2, &tmp, 1);
        tx.tail++;
        if (tx.tail >= BUFF_SIZE)
            tx.tail = 0;
    } else {
        tx.head = idx;
    }
    __enable_irq();
}