Some CMSIS-DAP adapters keep buffered packets over
USB close/open so we need to flush up to 64 old packets
to be sure all buffers are empty.
Flush just after cmsis_dap_open() and in the case of command mismatch.
Change-Id: If21a118639e64d90635b4ecf81013d29a7b9f78d
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/6135
Tested-by: jenkins
Reviewed-by: Adrian M Negreanu <adrian.negreanu@nxp.com>
+static void cmsis_dap_flush_read(struct cmsis_dap *dap)
+{
+ unsigned int i;
+ /* Some CMSIS-DAP adapters keep buffered packets over
+ * USB close/open so we need to flush up to 64 old packets
+ * to be sure all buffers are empty */
+ for (i = 0; i < 64; i++) {
+ int retval = dap->backend->read(dap, 10);
+ if (retval == ERROR_TIMEOUT_REACHED)
+ break;
+ }
+ if (i)
+ LOG_DEBUG("Flushed %u packets", i);
+}
+
/* Send a message and receive the reply */
static int cmsis_dap_xfer(struct cmsis_dap *dap, int txlen)
{
/* Send a message and receive the reply */
static int cmsis_dap_xfer(struct cmsis_dap *dap, int txlen)
{
if (resp[0] != current_cmd) {
LOG_ERROR("CMSIS-DAP command mismatch. Sent 0x%" PRIx8
" received 0x%" PRIx8, current_cmd, resp[0]);
if (resp[0] != current_cmd) {
LOG_ERROR("CMSIS-DAP command mismatch. Sent 0x%" PRIx8
" received 0x%" PRIx8, current_cmd, resp[0]);
+
+ cmsis_dap_flush_read(dap);
if (retval != ERROR_OK)
return retval;
if (retval != ERROR_OK)
return retval;
+ cmsis_dap_flush_read(cmsis_dap_handle);
+
retval = cmsis_dap_get_caps_info();
if (retval != ERROR_OK)
return retval;
retval = cmsis_dap_get_caps_info();
if (retval != ERROR_OK)
return retval;
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