o add first working draft of usb version

o having bad sync problems only can use 4 bytes buffer, supper slow

poc/avr_usbload/debug.c

@@ -0,0 +1,42 @@
+#include <stdlib.h>
+#include <stdint.h> 
+
+#include "debug.h"
+#include "uart.h"
+
+
+extern FILE uart_stdout;
+
+void dump_packet(uint32_t addr,uint32_t len,uint8_t *packet){
+	uint16_t i,j;
+	uint16_t sum = 0;
+	uint8_t clear=0;
+	
+	for (i=0;i<len;i+=16) {
+		
+		sum = 0;
+		for (j=0;j<16;j++) {
+			sum +=packet[i+j];
+		}
+		if (!sum){
+			clear=1;
+			continue;
+		}
+		if (clear){
+			printf("*\n");
+			clear = 0;
+		}	
+		printf("%08lx:", addr + i);
+		for (j=0;j<16;j++) {
+			printf(" %02x", packet[i+j]);
+		}
+		printf(" |");
+		for (j=0;j<16;j++) {
+			if (packet[i+j]>=33 && packet[i+j]<=126 )
+				printf("%c", packet[i+j]);
+			else
+				printf(".");
+		}
+		printf("|\n");
+	}
+}