From 07a45f0356f55c38f9d2bbbec36e742f43cdd3e1 Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Tue, 8 Jun 2010 12:01:14 +0200
Subject: [PATCH 1/1] defines for STATUS bytes

---
 usbtmc.c | 19 ++++++++++++-------
 usbtmc.h | 11 +++++++++++
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/usbtmc.c b/usbtmc.c
index ffebcbf..732b8f6 100644
--- a/usbtmc.c
+++ b/usbtmc.c
@@ -60,7 +60,7 @@ static struct scope* usbtmc_find_scope() {
 	return NULL;
 }
 
-static unsigned char usbtmc_status(struct scope *sc)
+static unsigned char usb488_status(struct scope *sc)
 {
 	int r;
 	unsigned char status[3];
@@ -72,7 +72,7 @@ static unsigned char usbtmc_status(struct scope *sc)
 		(sc->usb.bTag & 0x7f), 0, (char*)status, 3,
 		USB_TIMEOUT);
 
-	if ((r != 3) || (status[0] != 0x01) || (status[1] != (sc->usb.bTag & 0x7f))) {
+	if ((r != 3) || (status[0] != USBTMC_STATUS_SUCCESS) || (status[1] != (sc->usb.bTag & 0x7f))) {
 		printf("READ_STATUS_BYTE failed: %d 0x%x 0x%x 0x%x\n", r, status[0], status[1], status[2]);
 		return 0xff;
 	}
@@ -144,8 +144,8 @@ static void usbtmc_clear(struct scope *sc)
 		0, 0, (char*)status, 1,
 		USB_TIMEOUT);
 	
-	if ((r != 1) || status[0] != 0x01) {
-		printf("INITIATE_CLEAR failed: %s\n", usb_strerror());
+	if ((r != 1) || status[0] != USBTMC_STATUS_SUCCESS) {
+		printf("INITIATE_CLEAR failed (0x%x): %s\n", status[0], usb_strerror());
 		return;
 	}
 
@@ -158,12 +158,17 @@ static void usbtmc_clear(struct scope *sc)
 			0, 0, (char*)status, 2,
 			USB_TIMEOUT);
 
-		if ((r != 2) || status[0] != 0x01) {
+		if (r != 2) {
 			printf("CHECK_CLEAR failed: %s\n", usb_strerror());
 			return;
 		}
 
-		if (status[1] & (1<<0)) {
+		if (USBTMC_STATUS_FAIL(status[0])) {
+			printf("CHECK_CLEAR failed: 0x%x\n", status[0]);
+			return;
+		}
+
+		if ((status[0] == USBTMC_STATUS_SUCCESS) && (status[1] == 0)) {
 			printf("Success!\n");
 			break;
 		}
@@ -323,7 +328,7 @@ struct scope* usbtmc_initscope(void) {
 
 	usbtmc_claim(sc);
 	sc->usb.cap = usbtmc_get_capabilities(sc);
-	printf("Device status: 0x%x\n", usbtmc_status(sc));
+	printf("Device status: 0x%x\n", usb488_status(sc));
 	/* The following code isn't really necessary, the program works
 	   OK without it too. */
 	r=usb_control_msg(sc->usb.dev, 0xC8, 9, 0, 0, (char*)&vidpid, 4, USB_TIMEOUT);
diff --git a/usbtmc.h b/usbtmc.h
index 1fa1046..3734ff5 100644
--- a/usbtmc.h
+++ b/usbtmc.h
@@ -56,6 +56,17 @@ struct usbtmc_capabilities {
 #define USB488_CAP_DEV_RL1		(1<<1)
 #define USB488_CAP_DEV_DT1		(1<<0)
 
+#define USBTMC_STATUS_SUCCESS		0x01
+#define USBTMC_STATUS_PENDING		0x02
+#define USBTMC_STATUS_FAILED		0x80
+#define USBTMC_STATUS_TRANS_NIP		0x81
+#define USBTMC_STATUS_SPLIT_NIP		0x82
+#define USBTMC_STATUS_SPLIT_IP		0x83
+
+#define USBTMC_STATUS_SUCC(x)	(x == USBTMC_STATUS_SUCCESS)
+#define USBTMC_STATUS_WARN(x)	((x > USBTMC_STATUS_SUCCESS) && (x < USBTMC_STATUS_FAILED))
+#define USBTMC_STATUS_FAIL(x)	(x >= USBTMC_STATUS_FAILED)
+
 int usbtmc_sendscpi(struct scope *sc, char* cmd, unsigned char *resp, int resplen);
 struct scope * usbtmc_initscope(void);
 void usbtmc_close(struct scope *sc);
-- 
2.39.5