On Fri, May 03, 2013 at 12:59:11PM +0200, Hardy Griech wrote:
> I've encountered problems reading data from the target with an olimex-v1
> FET. Writing was ok.
>
> Turned out (hopefully), that in cp210x.c/usbtr_recv() the function
> usb_bulk_read() may legally return 0.
>
> Modifying the code to:
>
> do {
> rlen = usb_bulk_read(tr->handle, V1_IN_EP, (char *)databuf,
> max_len, TIMEOUT);
>
> #ifdef DEBUG_CP210X
> printc(__FILE__": %s : read %d\n", __FUNCTION__, rlen);
> #endif
>
> } while (rlen == 0);
>
> solved my problem.
>
> Should I submit a patch or is it ok in this way?
Hi Hardy,
I assume this is the latest git version? I've just altered your solution
slightly to keep a timeout for when usb_bulk_read() returns 0
immediately. Does this patch work for you?
------------------------------------------------------------------------
diff --git a/transport/cp210x.c b/transport/cp210x.c
index 1b8cc6f..436e978 100644
--- a/transport/cp210x.c
+++ b/transport/cp210x.c
@@ -21,6 +21,7 @@
#include <stdlib.h>
#include <string.h>
#include <usb.h>
+#include <time.h>
#include "cp210x.h"
#include "util.h"
@@ -67,7 +68,7 @@ struct cp210x_transport {
#define CP210X_WRITE_DTR 0x0100
#define CP210X_WRITE_RTS 0x0200
-#define TIMEOUT 30000
+#define TIMEOUT_S 30
static int configure_port(struct cp210x_transport *tr, int baud_rate)
{
@@ -201,7 +202,7 @@ static int usbtr_send(transport_t tr_base, const uint8_t
*data, int len)
#endif
while (len) {
sent = usb_bulk_write(tr->handle, V1_OUT_EP,
- (char *)data, len, TIMEOUT);
+ (char *)data, len, TIMEOUT_S * 1000);
if (sent <= 0) {
pr_error(__FILE__": can't send data");
return -1;
@@ -218,28 +219,35 @@ static int usbtr_recv(transport_t tr_base, uint8_t
*databuf, int max_len)
{
struct cp210x_transport *tr = (struct cp210x_transport *)tr_base;
int rlen;
+ time_t deadline = time(NULL) + TIMEOUT_S;
#ifdef DEBUG_CP210X
printc(__FILE__": %s : read max %d\n", __FUNCTION__, max_len);
#endif
- rlen = usb_bulk_read(tr->handle, V1_IN_EP, (char *)databuf,
- max_len, TIMEOUT);
+ while (time(NULL) < deadline) {
+ rlen = usb_bulk_read(tr->handle, V1_IN_EP, (char *)databuf,
+ max_len, TIMEOUT_S * 1000);
#ifdef DEBUG_CP210X
- printc(__FILE__": %s : read %d\n", __FUNCTION__, rlen);
+ printc(__FILE__": %s : read %d\n", __FUNCTION__, rlen);
#endif
- if (rlen <= 0) {
- pr_error(__FILE__": can't receive data");
- return -1;
- }
+ if (rlen < 0) {
+ pr_error(__FILE__": can't receive data");
+ return -1;
+ }
+ if (rlen > 0) {
#ifdef DEBUG_CP210X
- debug_hexdump(__FILE__": USB transfer in", databuf, rlen);
+ debug_hexdump(__FILE__": USB transfer in", databuf,
rlen);
#endif
+ return rlen;
+ }
+ }
- return rlen;
+ pr_error(__FILE__": read operation timed out");
+ return -1;
}
static void usbtr_destroy(transport_t tr_base)
------------------------------------------------------------------------------
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