JTAG_TRST_ASSERTED event cleanup. More clear where and when it is invoked and some...

git-svn-id: svn://svn.berlios.de/openocd/trunk@2040 b42882b7-edfa-0310-969c-e2dbd0fdcd60

diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c
index fca603657ff53630484a125c84b6eda715c02f49..0733789f1bc7b308100f656ae55166bb16a3d1a0 100644 (file)
--- a/src/jtag/jtag.c
+++ b/src/jtag/jtag.c
@@ -385,17 +385,14 @@ int jtag_call_event_callbacks(enum jtag_event event)
        return ERROR_OK;
 }
 
-static void jtag_prelude1(void)
+static void jtag_checks(void)
 {
        assert(jtag_trst == 0);
-
-       if (cmd_queue_end_state == TAP_RESET)
-               jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 }
 
 static void jtag_prelude(tap_state_t state)
 {
-       jtag_prelude1();
+       jtag_checks();
 
        if (state != TAP_INVALID)
                jtag_add_end_state(state);
@@ -596,6 +593,8 @@ void jtag_add_tlr(void)
        retval=interface_jtag_add_tlr();
        if (retval!=ERROR_OK)
                jtag_error=retval;
+       
+       jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
 }
 
 void jtag_add_pathmove(int num_states, const tap_state_t *path)
@@ -628,7 +627,7 @@ void jtag_add_pathmove(int num_states, const tap_state_t *path)
                cur_state = path[i];
        }
 
-       jtag_prelude1();
+       jtag_checks();
 
        retval = interface_jtag_add_pathmove(num_states, path);
        cmd_queue_cur_state = path[num_states - 1];
@@ -663,7 +662,7 @@ void jtag_add_clocks( int num_cycles )
 
        if( num_cycles > 0 )
        {
-               jtag_prelude1();
+               jtag_checks();
 
                retval = interface_jtag_add_clocks(num_cycles);
                if (retval != ERROR_OK)
@@ -755,7 +754,6 @@ void jtag_add_reset(int req_tlr_or_trst, int req_srst)
                LOG_DEBUG("JTAG reset with RESET instead of TRST");
                jtag_add_end_state(TAP_RESET);
                jtag_add_tlr();
-               jtag_call_event_callbacks(JTAG_TRST_ASSERTED);
                return;
        }
 

diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h
index 04eefaadb38e251b0e0bced471f475d71401fe92..5fbe7dc103515dc2a2bf4b1724ef893fa55f3fd2 100644 (file)
--- a/src/jtag/jtag.h
+++ b/src/jtag/jtag.h
@@ -218,6 +218,17 @@ enum reset_line_mode {
        LINE_PUSH_PULL  = 0x1,
 };
 
+/* 
+ * There are three cases when JTAG_TRST_ASSERTED callback is invoked. The
+ * event is invoked *after* TRST is asserted(or queued rather). It is illegal 
+ * to communicate with the JTAG interface during the callback(as there is 
+ * currently a queue being built).
+ * 
+ * - TMS reset
+ * - SRST pulls TRST
+ * - TRST asserted
+ * 
+ **/
 enum jtag_event {
        JTAG_TRST_ASSERTED
 };