Only call cmsis_dap_cmd_DAP_SWD_Configure when swd_mode is enabled

The CMSIS-DAP used by NXP's LS1012ARDB board only supports JTAG,
and not SWD. Calling cmsis_dap_cmd_DAP_SWD_Configure returns with an
error (and doesn't actually do anything in the debugger).

Wrap the call to cmsis_dap_cmd_DAP_SWD_Configure in a check for
swd_mode, to make sure initialisation doesn't fail needlessly.

Change-Id: Id7e568cb6e36886bd7c5b3699d198a77a51c28c9
Signed-off-by: Bas Vermeulen <bas@daedalean.ai>
Reviewed-on: http://openocd.zylin.com/4294
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

diff --git a/src/jtag/drivers/cmsis_dap_usb.c b/src/jtag/drivers/cmsis_dap_usb.c
index 19c3b19c920ab7acddfa5cd59cf1ac92316e1dab..345c1fd7e8f62b127c1abbbe41c16eda5dd3b861 100644 (file)
--- a/src/jtag/drivers/cmsis_dap_usb.c
+++ b/src/jtag/drivers/cmsis_dap_usb.c
@@ -958,11 +958,14 @@ static int cmsis_dap_init(void)
        retval = cmsis_dap_cmd_DAP_TFER_Configure(0, 64, 0);
        if (retval != ERROR_OK)
                return ERROR_FAIL;
-       /* Data Phase (bit 2) must be set to 1 if sticky overrun
-        * detection is enabled */
-       retval = cmsis_dap_cmd_DAP_SWD_Configure(0);    /* 1 TRN, no Data Phase */
-       if (retval != ERROR_OK)
-               return ERROR_FAIL;
+
+       if (swd_mode) {
+               /* Data Phase (bit 2) must be set to 1 if sticky overrun
+                * detection is enabled */
+               retval = cmsis_dap_cmd_DAP_SWD_Configure(0);    /* 1 TRN, no Data Phase */
+               if (retval != ERROR_OK)
+                       return ERROR_FAIL;
+       }
 
        retval = cmsis_dap_cmd_DAP_LED(0x03);           /* Both LEDs on */
        if (retval != ERROR_OK)