From: Michael Gernoth <michael@gernoth.net>
Date: Mon, 7 Jun 2010 22:35:52 +0000 (+0200)
Subject: better error recovery
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rigol/commitdiff_plain/0aa0b76135715eb6c2771248abafb83a2fd06676?hp=7b57506902b8a0b9ba2186eea5e99901e5afa952

better error recovery
---

diff --git a/usbtmc.c b/usbtmc.c
index 5b07ade..4a23a4f 100644
--- a/usbtmc.c
+++ b/usbtmc.c
@@ -17,7 +17,7 @@
 #error BYTE_ORDER not defined/known!
 #endif
 
-#define USB_ERROR(x) do { if (x < 0) { fprintf(stderr, "usb: %s\n", usb_strerror()); exit(EXIT_FAILURE); } } while(0)
+#define USB_ERROR(s, x) do { if (x < 0) { fprintf(stderr, "usb %s: %s\n", s, usb_strerror()); usb_reset(sc->usb.dev); return 0; } } while(0)
 
 /* This routine locates a scope by VID/PID and returns a struct scope* for it */
 static struct scope* usbtmc_find_scope() {
@@ -93,16 +93,16 @@ int usbtmc_sendscpi(struct scope *sc, char* cmd,
 		r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
 			(char*)req, sizeof(struct usbtmc_header),
 			USB_TIMEOUT);
-		USB_ERROR(r);
+		USB_ERROR("USBTMC_DEV_DEP_MSG_OUT1", r);
 
 		r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
 			(char*)&(req->msg), len - sizeof(struct usbtmc_header),
 			USB_TIMEOUT);
-		USB_ERROR(r);
+		USB_ERROR("USBTMC_DEV_DEP_MSG_OUT2", r);
 	} else {
 		r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
 			(char*)req, len, USB_TIMEOUT);
-		USB_ERROR(r);
+		USB_ERROR("USBTMC_DEV_DEP_MSG_OUT", r);
 	}
 
 	free(req);
@@ -124,13 +124,13 @@ int usbtmc_sendscpi(struct scope *sc, char* cmd,
 		req->bTag = sc->usb.bTag;
 		req->bTagInverse = ~sc->usb.bTag;
 		req->TransferSize = LE32(sc->usb.wMaxPacketSize_in);
-		req->bmTransferAttributes = 0;
+		req->bmTransferAttributes = USBTMC_TRANSFERATTRIB_EOM;
 		req->TermChar = 0;
 
 		/* send read command */
 		r=usb_bulk_write(sc->usb.dev, sc->usb.ep_bulk_out,
 			(char*)req, sizeof(struct usbtmc_header), USB_TIMEOUT);
-		USB_ERROR(r);
+		USB_ERROR("USBTMC_REQUEST_DEV_DEP_MSG_IN", r);
 
 		free(req);
 
@@ -142,7 +142,7 @@ int usbtmc_sendscpi(struct scope *sc, char* cmd,
 
 		r=usb_bulk_read(sc->usb.dev, sc->usb.ep_bulk_in,
 			(char*)buff, sc->usb.wMaxPacketSize_in, USB_TIMEOUT);
-		USB_ERROR(r);
+		USB_ERROR("USBTMC_DEV_DEP_MSG_IN1", r);
 
 		if (r < sizeof(struct usbtmc_header)) {
 			fprintf(stderr, "Short read!\n");
@@ -166,7 +166,7 @@ int usbtmc_sendscpi(struct scope *sc, char* cmd,
 			r=usb_bulk_read(sc->usb.dev, sc->usb.ep_bulk_in,
 				(char*)buff + bytes_read, len - bytes_read,
 				USB_TIMEOUT);
-			USB_ERROR(r);
+			USB_ERROR("USBTMC_DEV_DEP_MSG_INx", r);
 
 			bytes_read += r;
 		}