More fixes, and a bit of SRQ.

examples/device/usbtmc/src/usbtmc_app.c

@@ -1,7 +1,7 @@
 /*
  * The MIT License (MIT)
  *
- * Copyright (c) 2019 N Conrad
+ * Copyright (c) 2019 Nathan Conrad
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -73,6 +73,11 @@ static volatile uint8_t status;
 static volatile uint16_t queryState = 0;
 static volatile uint32_t queryDelayStart;
 static volatile uint32_t bulkInStarted;
+static volatile uint32_t idnQuery;
+
+static size_t buffer_len;
+static uint8_t buffer[225]; // A few packets long should be enough.
+
 
 static usbtmc_msg_dev_dep_msg_in_header_t rspMsg = {
     .bmTransferAttributes =
@@ -82,16 +87,20 @@ static usbtmc_msg_dev_dep_msg_in_header_t rspMsg = {
     }
 };
 
+bool usbtmcd_app_msg_trigger(uint8_t rhport, usbtmc_msg_generic_t* msg) {
+  (void)rhport;
+  (void)msg;
+  return true;
+}
+
 bool usbtmcd_app_msgBulkOut_start(uint8_t rhport, usbtmc_msg_request_dev_dep_out const * msgHeader)
 {
   (void)rhport;
   (void)msgHeader;
-  //uart_tx_str_sync("MSG_OUT_DATA: start\r\n");
+#ifdef xDEBUG
-  return true;
+  uart_tx_str_sync("MSG_OUT_DATA: start\r\n");
-}
+#endif
-bool usbtmcd_app_msg_trigger(uint8_t rhport, usbtmc_msg_generic_t* msg) {
+  buffer_len = 0;
-  (void)rhport;
-  (void)msg;
   return true;
 }
 
@@ -100,14 +109,25 @@ bool usbtmcd_app_msg_data(uint8_t rhport, void *data, size_t len, bool transfer_
   (void)rhport;
 
   // If transfer isn't finished, we just ignore it (for now)
-  /*uart_tx_str_sync("MSG_OUT_DATA: <<<");
+#ifdef xDEBUG
+  uart_tx_str_sync("MSG_OUT_DATA: <<<");
   uart_tx_sync(data,len);
   uart_tx_str_sync(">>>\r\n");
   if(transfer_complete)
     uart_tx_str_sync("MSG_OUT_DATA: Complete\r\n");
-*/
+#endif
-  if(transfer_complete && (len >=4) && !strncasecmp("*idn?",data,4)) {
+
-    queryState = 1;
+  if(len + buffer_len < sizeof(buffer))
+  {
+    memcpy(&(buffer[buffer_len]), data, len);
+    buffer_len += len;
+  }
+  queryState = transfer_complete;
+  idnQuery = 0;
+
+  if(transfer_complete && (len >=4) && !strncasecmp("*idn?",data,4))
+  {
+    idnQuery = 1;
   }
   return true;
 }
@@ -116,7 +136,7 @@ bool usbtmcd_app_msgBulkIn_complete(uint8_t rhport)
 {
   (void)rhport;
 
-  status &= (uint8_t)~(0x10u); // clear MAV
+  status &= (uint8_t)~(0x50u); // clear MAV and SRQ
 
   return true;
 }
@@ -131,8 +151,9 @@ bool usbtmcd_app_msgBulkIn_request(uint8_t rhport, usbtmc_msg_request_dev_dep_in
   rspMsg.header.bTag = request->header.bTag,
   rspMsg.header.bTagInverse = request->header.bTagInverse;
   msgReqLen = request->TransferSize;
-
+#ifdef xDEBUG
-  //uart_tx_str_sync("MSG_IN_DATA: Requested!\r\n");
+  uart_tx_str_sync("MSG_IN_DATA: Requested!\r\n");
+#endif
   TU_ASSERT(bulkInStarted == 0);
   bulkInStarted = 1;
 
@@ -145,7 +166,11 @@ bool usbtmcd_app_msgBulkIn_request(uint8_t rhport, usbtmc_msg_request_dev_dep_in
 
 void usbtmc_app_task_iter(void) {
   uint8_t const rhport = 0;
-
+  uint32_t board_delay = 5u;
+  if(idnQuery)
+  {
+    board_delay = 350u;
+  }
   switch(queryState) {
   case 0:
     break;
@@ -154,14 +179,15 @@ void usbtmc_app_task_iter(void) {
     queryState = 2;
     break;
   case 2:
-    if( (board_millis() - queryDelayStart) > 200u) {
+    if( (board_millis() - queryDelayStart) > board_delay) {
       queryDelayStart = board_millis();
       queryState=3;
       status |= 0x10u; // MAV
+      status |= 0x40u; // SRQ
     }
     break;
   case 3:
-    if( (board_millis() - queryDelayStart) > 400u) {
+    if( (board_millis() - queryDelayStart) > board_delay) {
       queryState = 4;
     }
     break;
@@ -169,8 +195,17 @@ void usbtmc_app_task_iter(void) {
     if(bulkInStarted) {
       queryState = 0;
       bulkInStarted = 0;
-      //uart_tx_str_sync("usbtmc_app_task_iter: sending rsp!\r\n");
+#ifdef xDEBUG
+      uart_tx_str_sync("usbtmc_app_task_iter: sending rsp!\r\n");
+#endif
+      if(idnQuery)
+      {
         usbtmcd_transmit_dev_msg_data(rhport, idn,  tu_min32(sizeof(idn)-1,msgReqLen),false);
+      }
+      else
+      {
+        usbtmcd_transmit_dev_msg_data(rhport, buffer,  tu_min32(buffer_len,msgReqLen),false);
+      }
       // MAV is cleared in the transfer complete callback.
     }
     break;
@@ -235,10 +270,13 @@ void usmtmcd_app_bulkOut_clearFeature(uint8_t rhport)
 uint8_t usbtmcd_app_get_stb(uint8_t rhport, uint8_t *tmcResult)
 {
   (void)rhport;
+  uint8_t old_status = status;
+  status = status & ~(0x40); // clear SRQ
+
   *tmcResult = USBTMC_STATUS_SUCCESS;
   // Increment status so that we see different results on each read...
 
-  return status;
+  return old_status;
 }
 
 bool usbtmcd_app_indicator_pluse(uint8_t rhport, tusb_control_request_t const * msg, uint8_t *tmcResult)

examples/device/usbtmc/visaQuery.py

@@ -0,0 +1,69 @@
+import visa
+import time
+import sys
+
+
+def test_idn():
+	idn = inst.query("*idn?");
+	assert idn == "TinyUSB,ModelNumber,SerialNumber,FirmwareVer123456\r\n"
+
+def test_echo():
+	longstr = "0123456789abcdef" * 50
+
+	#Next try echo from 1 to 175 characters (200 is max buffer size on DUT)
+	for i in range(49,175):
+		x = longstr[0:i]
+		xt = x + inst.write_termination
+		y = inst.query(x)
+		assert(xt == y), f"echo {i}"
+
+def test_mav():
+	assert (inst.read_stb() == 0)
+	inst.write("123")
+	time.sleep(0.3)
+	assert (inst.read_stb() & 0x10), "MAV not set after 0.5 seconds"
+	
+	rsp = inst.read()
+	assert(rsp == "123\r\n")
+	
+	
+def test_srq():
+	assert (inst.read_stb() == 0)
+	inst.write("123")
+	
+	#inst.enable_event(visa.constants.VI_EVENT_SERVICE_REQ, visa.constants.VI_QUEUE)
+	#waitrsp = inst.wait_on_event(visa.constants.VI_EVENT_SERVICE_REQ, 5000)
+	#inst.discard_events(visa.constants.VI_EVENT_SERVICE_REQ, visa.constants.VI_QUEUE)
+	#inst.wait_for_srq()
+	time.sleep(0.3)
+	stb = inst.read_stb()
+	msg =  "SRQ not set after 0.5 seconds, was {:02x}".format(stb)
+	assert (stb == 0x50),msg
+
+	assert (inst.read_stb() == 0x10), "SRQ set at second read!"
+	
+	rsp = inst.read()
+	assert(rsp == "123\r\n")
+	
+
+rm = visa.ResourceManager("/c/Windows/system32/visa64.dll")
+reslist = rm.list_resources("USB?::?*::INSTR")
+print(reslist)
+
+if (len(reslist) == 0):
+    sys.exit()
+	
+inst = rm.open_resource(reslist[0]);
+inst.timeout = 3000
+inst.clear()
+
+#print(idn);
+inst.clear()
+
+test_idn()
+test_echo()
+test_mav()
+test_srq()
+
+inst.close()
+print("Test complete")

src/class/usbtmc/usbtmc_device.c

@@ -371,6 +371,7 @@ static bool handle_devMsgOut(uint8_t rhport, void *data, size_t len, size_t pack
     len = usbtmc_state.transfer_size_remaining;
   usbtmcd_app_msg_data(rhport,data, len, atEnd);
 
+  usbtmc_state.transfer_size_remaining -= len;
   usbtmc_state.transfer_size_sent += len;
   if(atEnd)
   {
@@ -476,11 +477,12 @@ bool usbtmcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint
 
     case STATE_RCV:
       TU_VERIFY(handle_devMsgOut(rhport, usbtmc_state.ep_bulk_out_buf, xferred_bytes, xferred_bytes));
+      TU_VERIFY(usbd_edpt_xfer(rhport, usbtmc_state.ep_bulk_out, usbtmc_state.ep_bulk_out_buf, USBTMCD_MAX_PACKET_SIZE));
       return true;
 
     case STATE_ABORTING_BULK_OUT:
       TU_VERIFY(false);
-      return false; // Shold be stalled by now...
+      return false; // Should be stalled by now...
     case STATE_TX_REQUESTED:
     case STATE_TX_INITIATED:
     case STATE_ABORTING_BULK_IN: