Add testcase for aborting bulk in with no data queued (and fix aborting bulk in)

examples/device/usbtmc/src/usbtmc_app.c

@@ -203,7 +203,7 @@ void usbtmc_app_task_iter(void) {
 
       if(idnQuery)
       {
-      usbtmcd_transmit_dev_msg_data(rhport, idn,  tu_min32(sizeof(idn)-1,msgReqLen),false);
+        usbtmcd_transmit_dev_msg_data(rhport, idn,  tu_min32(sizeof(idn)-1,msgReqLen),false);
       }
       else
       {

examples/device/usbtmc/visaQuery.py

@@ -3,6 +3,7 @@ import time
 import sys
 
 
+
 def test_idn():
 	idn = inst.query("*idn?");
 	assert idn == "TinyUSB,ModelNumber,SerialNumber,FirmwareVer123456\r\n"
@@ -60,6 +61,24 @@ def test_srq():
 	rsp = inst.read()
 	assert(rsp == "123\r\n")
 	
+		
+
+def test_read_timeout():
+	inst.timeout = 500
+	# First read with no MAV
+	inst.read_stb()
+	assert (inst.read_stb() == 0)
+	inst.write("delay 500")
+	t0 = time.time()
+	try:
+		rsp = inst.read()
+		assert(false), "Read should have resulted in timeout"
+	except visa.VisaIOError:
+		print("Got expected exception")
+	t = time.time() - t0
+	assert ((t*1000.0) > (inst.timeout - 300))
+	assert ((t*1000.0) < (inst.timeout + 300))
+	print(f"Delay was {t}")
 
 rm = visa.ResourceManager("/c/Windows/system32/visa64.dll")
 reslist = rm.list_resources("USB?::?*::INSTR")
@@ -72,8 +91,11 @@ inst = rm.open_resource(reslist[0]);
 inst.timeout = 3000
 inst.clear()
 
-#print("+ IDN")
+print("+ IDN")
-#test_idn()
+test_idn()
+
+inst.timeout = 3000
+
 
 print("+ echo delay=0")
 inst.write("delay 0")
@@ -88,6 +110,9 @@ inst.write("delay 150")
 test_echo(53,76)
 test_echo(165,170)
 
+print("+ Read timeout (no MAV")
+test_read_timeout()
+
 print("+ MAV")
 test_mav()
 

src/class/usbtmc/usbtmc_device.c

@@ -102,7 +102,7 @@ typedef enum
   STATE_CLEARING,
   STATE_ABORTING_BULK_IN,
   STATE_ABORTING_BULK_IN_SHORTED, // aborting, and short packet has been queued for transmission
-  STATE_ABORTING_BULK_IN_ABORTED, // aborting, and short packet has been queued for transmission
+  STATE_ABORTING_BULK_IN_ABORTED, // aborting, and short packet has been transmitted
   STATE_ABORTING_BULK_OUT,
   STATE_NUM_STATES
 } usbtmcd_state_enum;
@@ -384,6 +384,7 @@ static bool handle_devMsgIn(uint8_t rhport, void *data, size_t len)
     usbtmc_state.state = STATE_TX_REQUESTED;
     usbtmc_state.lastBulkInTag = msg->header.bTag;
     usbtmc_state.transfer_size_remaining = msg->TransferSize;
+    usbtmc_state.transfer_size_sent = 0u;
   }
   criticalLeave();
 
@@ -612,8 +613,14 @@ bool usbtmcd_control_request(uint8_t rhport, tusb_control_request_t const * requ
       rsp.USBTMC_status = USBTMC_STATUS_SUCCESS;
     usbtmc_state.transfer_size_remaining = 0;
       // Check if we've queued a short packet
-      usbtmc_state.state = ((usbtmc_state.transfer_size_sent % USBTMCD_MAX_PACKET_SIZE) != 0) ?
+      usbtmc_state.state = ((usbtmc_state.transfer_size_sent % USBTMCD_MAX_PACKET_SIZE) == 0) ?
               STATE_ABORTING_BULK_IN : STATE_ABORTING_BULK_IN_SHORTED;
+      if(usbtmc_state.transfer_size_sent  == 0)
+      {
+        // Send short packet, nothing is in the buffer yet
+        TU_VERIFY( usbd_edpt_xfer(rhport, usbtmc_state.ep_bulk_in, usbtmc_state.ep_bulk_in_buf,(uint16_t)0u));
+        usbtmc_state.state = STATE_ABORTING_BULK_IN_SHORTED;
+      }
       TU_VERIFY(usbtmcd_app_initiate_abort_bulk_in(rhport, &(rsp.USBTMC_status)));
     }
     else if((usbtmc_state.state == STATE_TX_REQUESTED || usbtmc_state.state == STATE_TX_INITIATED))
@@ -638,7 +645,7 @@ bool usbtmcd_control_request(uint8_t rhport, tusb_control_request_t const * requ
         .USBTMC_status = USBTMC_STATUS_FAILED,
         .bmAbortBulkIn =
         {
-            .BulkInFifoBytes = (usbtmc_state.state == STATE_ABORTING_BULK_IN_ABORTED)
+            .BulkInFifoBytes = (usbtmc_state.state != STATE_ABORTING_BULK_IN_ABORTED)
         },
         .NBYTES_RXD_TXD = usbtmc_state.transfer_size_sent,
     };
@@ -647,6 +654,7 @@ bool usbtmcd_control_request(uint8_t rhport, tusb_control_request_t const * requ
     {
     case STATE_ABORTING_BULK_IN_ABORTED:
       rsp.USBTMC_status = USBTMC_STATUS_SUCCESS;
+      usbtmc_state.state = STATE_IDLE;
       break;
     case STATE_ABORTING_BULK_IN:
     case STATE_ABORTING_BULK_OUT: