fixes

avr_code/uart.c

@@ -57,6 +57,14 @@ void uart_sendString(const char* str)
     }
 }
 
+void uart_sendString_P(const char* progmem_str)
+{
+    char c;
+    while ((c = pgm_read_byte(progmem_str++)) != '\0') {
+        uart_sendChar(c);
+    }
+}
+
 void uart_print_uint16(uint16_t meas, const char* buf)
 {
     snprintf(array_internal, sizeof(array_internal), "%u", meas);