#include "buffer.h"

uint8_t buff_empty=1;
static uint8_t buff_start;
static uint8_t buff_end;

static uint8_t buffer[BUFFER_SIZE];

uint8_t readBuffer(void){
    uint8_t ret;    
    if(buff_empty){
        return 0;
    }
    ret=buffer[buff_end];
    buff_end++;
    if(buff_end==BUFFER_SIZE){
        buff_end=0;
    }
    if(buff_end==buff_start){
        buff_empty=1;
    }
    return ret;
}

void writeToBuffer(uint8_t data){
    if(buff_start==buff_end && !buff_empty){
        /*overrun*/
        return;
    }
    buffer[buff_start]=data;
    buff_start++;
    if(buff_start==BUFFER_SIZE){
        buff_start=0;
    }
    buff_empty=0;
}

void buffer_unum(uint32_t num){
	uint8_t text[8] = {0,0,0,0,0,0,0,0};
	uint8_t i;

	for(i=1;i<=8;i++){
        /*calculate scancode from digit*/
		text[8-i] = USB_KEY_1-1+((num)%10);
        if(text[8-i]==USB_KEY_1-1){
            text[8-i]=USB_KEY_0;
        }
		num/=10;
	}
    for(i=0;i<8;i++){
        writeToBuffer(text[i]);
    }
}