+cli_rx_fpt cli_rx = NULL;
+cli_tx_fpt cli_tx = NULL;
+uint8_t cli_echo=1;
+
+/**
+ * \brief output a character to the console
+ *
+ */
+
+void cli_putc(char c){
+ if(cli_tx)
+ cli_tx(c);
+}
+
+/**
+ * \brief get a character from the console
+ * Gets a character from the console input and blocks
+ * until a character is recieved
+ */
+uint16_t cli_getc(void){
+ if(cli_rx)
+ return cli_rx();
+ return ((uint16_t)-1);
+}
+
+/**
+ * \brief get a character from the console
+ * Gets a char from the console input (like cli_getc())
+ * and echos it back to the console if echo is enabled.
+ */
+uint16_t cli_getc_cecho(void){
+ char c;
+ if(cli_rx){
+ c = cli_rx();
+ if(cli_tx && cli_echo)
+ cli_tx(c);
+ return c;
+ }
+ return ((uint16_t)-1);
+}
+
+/**
+ * \brief ouputs a zero-terminated string from ram to the console
+ */
+void cli_putstr(const char* s){
+ if(!cli_tx)
+ return;
+ while(*s)
+ cli_tx(*s++);
+}
+
+
+/**
+ * \brief ouputs a zero-terminated string from flash to the console
+ */
+void cli_putstr_P(PGM_P s){
+ char c;
+ if(!cli_tx)
+ return;
+ for(;;){
+ c = pgm_read_byte(s++);
+ if(!c)
+ return;
+ cli_tx(c);
+ }
+}
+
+/**
+ * \brief reads a line or max n characters from the console
+ * Writes characters from the console into the supplyed buffer until a '\r'
+ * character is recieved or until n character a read (whatever happens first).
+ * The string will always be terminated by a '\0' character, so the buffer
+ * should have at least a size of n+1.
+ */
+uint8_t cli_getsn(char* s, uint16_t n){
+ char c;
+ if(n==0)
+ return 2;
+ while((c=cli_getc_cecho())!='\0' && c!='\r' && n--){
+ *s++=c;
+ }
+ *s='\0';
+ return (c=='\r')?0:1;
+}
+
+/**
+ * \brief dumps the contents of a buffer to the console
+ * Dumps length bytes from data to the console ouput. The dump
+ * will have 2*n continous hexadecimal characters.
+ */
+void cli_hexdump(const void* data, uint16_t length){
+ if(!cli_tx)
+ return;
+ while(length--){
+ cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))>>4)));
+ cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))&0xf)));
+ data = (uint8_t*)data +1;
+ }
+}
+
+/**
+ * \brief dumps the contents of a buffer to the console
+ * This function behaves like cli_hexdump except that the
+ * bytes are dumped in reverse order. This is usefull to dump
+ * integers which ar e in little endian order.
+ */
+void cli_hexdump_rev(const void* data, uint16_t length){
+ if(!cli_tx)
+ return;
+ data = (uint8_t*)data + length -1;
+ while(length--){
+ cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))>>4)));
+ cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))&0xf)));
+ data = (uint8_t*)data -1;
+ }
+}
+
+/**
+ * \brief dumps the contents of a buffer to the console
+ * Like cli_hexdump but bytes are seperated with a single space
+ * on the console output.
+ */
+void cli_hexdump2(const void* data, uint16_t length){
+ if(!cli_tx)
+ return;
+ while(length--){
+ cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))>>4)));
+ cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))&0xf)));
+ cli_tx(' ');
+ data = (uint8_t*)data +1;
+ }
+}
+
+/**
+ * \brief dumps the contents of a buffer to the console
+ * Like cli_hexdump but bytes are seperated with a single space
+ * on the console output.
+ */
+void cli_hexdump_block(const void* data, uint16_t length, uint8_t indent, uint8_t width){
+ uint16_t i;
+ uint8_t j;
+ if(!cli_tx)
+ return;
+ for(i=0; i<length; ++i){
+ if(i%width==0){
+ cli_putstr_P(PSTR("\r\n"));
+ for(j=0; j<indent; ++j){
+ cli_tx(' ');
+ }