diff -r 8f2be7aaec00 -r 424d792fea4f src/hp34comm.cpp
--- a/src/hp34comm.cpp	Thu Oct 15 01:12:31 2020 +0200
+++ b/src/hp34comm.cpp	Fri Oct 16 22:08:47 2020 +0200
@@ -1,6 +1,7 @@
 #include "hp34comm.h"
-#include "mbed.h"
-#include "CircularBuffer.h"
+
+#include <mbed.h>
+#include <CircularBuffer.h>
 
 /***** HP 34970A communication class ***/
 
@@ -37,7 +38,7 @@
 {
   serial.baud(187500);
   cur_state = STATE_IDLE;
-  serial.attach(callback(this, &HPSerial::rxIrq), Serial::RxIrq);
+  serial.attach(callback(this, &HPSerial::rxIrq), SerialBase::RxIrq);
 }
 
 void HPSerial::startup(void) {
@@ -105,7 +106,7 @@
 }
 
 void HPSerial::send_ack(uint8_t c) {
-  serial.putc(c);
+	serial.write(&c, 1);
   set_timer(RXTIMEOUT); // if nothing else happen in the next ms, reset
 }
 
@@ -184,14 +185,14 @@
   {
     return do_state_eot();
   }
-  serial.putc(tr_data.payload[tr_data.pos++]);
+  serial.write(&tr_data.payload[tr_data.pos++], 1);
   set_timer(RXTIMEOUT);
   return HPSerial::STATE_SENDING;
 }
 
 HPSerial::state_t HPSerial::do_state_eot(uint8_t c)
 {
-  serial.putc(0x55); // EoT
+  serial.write(&c, 1); // EoT
   cur_gstate = GSTATE_IDLE;
   set_timer(); // We are IDLE, detach the timeouter
   return STATE_IDLE;
@@ -212,7 +213,8 @@
     inrx=1;
 #endif
     //lled = 1;
-    val = serial.getc();
+    //val = serial.getc();
+	serial.read(&val, 1);
     cur_state = run_state(cur_state, val);
     //lled = 0;
 #ifdef DEBUG2