Committed.
This is an example of how to rewrite code to not use in_handler.
Getting rid of the in_handler code will greatly simplify the jtag.c code and
increase legibility of the user code. Especially for those that are reading
and not writing that code.
--
Øyvind Harboe
Embedded software and hardware consulting services
http://consulting.zylin.com
### Eclipse Workspace Patch 1.0
#P openocd
Index: src/jtag/jtag.h
===================================================================
--- src/jtag/jtag.h (revision 1611)
+++ src/jtag/jtag.h (working copy)
@@ -561,6 +561,10 @@
extern void jtag_add_ir_scan(int num_fields, scan_field_t* fields, tap_state_t
endstate);
extern int interface_jtag_add_ir_scan(int num_fields, scan_field_t* fields,
tap_state_t endstate);
extern void jtag_add_dr_scan(int num_fields, scan_field_t* fields, tap_state_t
endstate);
+/* same as jtag_add_dr_scan but the scan is executed immediately. sets
jtag_error if there
+ * was a failure.
+ */
+extern void jtag_add_dr_scan_now(int num_fields, scan_field_t* fields,
tap_state_t endstate);
extern int interface_jtag_add_dr_scan(int num_fields, scan_field_t* fields,
tap_state_t endstate);
extern void jtag_add_plain_ir_scan(int num_fields, scan_field_t* fields,
tap_state_t endstate);
extern int interface_jtag_add_plain_ir_scan(int num_fields, scan_field_t*
fields, tap_state_t endstate);
@@ -696,6 +700,16 @@
*/
extern int jtag_execute_queue(void);
+/* this flag is set when an error occurs while executing the queue. cleared
+ * by jtag_execute_queue()
+ *
+ * this flag can also be set from application code if some error happens
+ * during processing that should be reported during jtag_execute_queue().
+ */
+extern int jtag_error;
+
+
+
/* can be implemented by hw+sw */
extern int interface_jtag_execute_queue(void);
extern int jtag_power_dropout(int* dropout);
Index: src/jtag/zy1000.c
===================================================================
--- src/jtag/zy1000.c (revision 1613)
+++ src/jtag/zy1000.c (working copy)
@@ -39,8 +39,6 @@
#define ZYLIN_OPENOCD_VERSION "Zylin JTAG ZY1000 " ZYLIN_VERSION " "
ZYLIN_DATE " " ZYLIN_TIME
const char *zylin_config_dir="/config/settings";
-extern int jtag_error;
-
/* low level command set
*/
int zy1000_read(void);
Index: src/jtag/jtag.c
===================================================================
--- src/jtag/jtag.c (revision 1628)
+++ src/jtag/jtag.c (working copy)
@@ -42,6 +42,8 @@
#include <strings.h>
#endif
+static void jtag_execute_queue_noclear(void);
+
/* note that this is not marked as static as it must be available from outside
jtag.c for those
that implement the jtag_xxx() minidriver layer
*/
@@ -670,6 +672,12 @@
jtag_error=retval;
}
+void jtag_add_dr_scan_now(int num_fields, scan_field_t *fields, tap_state_t
state)
+{
+ jtag_add_dr_scan(num_fields, fields, state);
+ jtag_execute_queue_noclear();
+}
+
int MINIDRIVER(interface_jtag_add_dr_scan)(int num_fields, scan_field_t
*fields, tap_state_t state)
{
int j;
@@ -1438,13 +1446,21 @@
return retval;
}
-int jtag_execute_queue(void)
+static void jtag_execute_queue_noclear(void)
{
int retval=interface_jtag_execute_queue();
- if (retval==ERROR_OK)
+ /* we keep the first error */
+ if ((jtag_error==ERROR_OK)&&(retval!=ERROR_OK))
{
- retval=jtag_error;
+ jtag_error=retval;
}
+}
+
+int jtag_execute_queue(void)
+{
+ int retval;
+ jtag_execute_queue_noclear();
+ retval=jtag_error;
jtag_error=ERROR_OK;
return retval;
}
@@ -1485,10 +1501,10 @@
field.tap = NULL;
field.num_bits = sizeof(idcode_buffer) * 8;
field.out_value = idcode_buffer;
-
+
field.in_value = idcode_buffer;
-
-
+
+
field.in_handler = NULL;
for (i = 0; i < JTAG_MAX_CHAIN_SIZE; i++)
@@ -1662,10 +1678,7 @@
field.tap = NULL;
field.num_bits = total_ir_length;
field.out_value = ir_test;
-
field.in_value = ir_test;
-
-
field.in_handler = NULL;
jtag_add_plain_ir_scan(1, &field, TAP_RESET);
Index: src/target/arm7tdmi.c
===================================================================
--- src/target/arm7tdmi.c (revision 1611)
+++ src/target/arm7tdmi.c (working copy)
@@ -5,6 +5,9 @@
* Copyright (C) 2008 by Spencer Oliver *
* [email protected] *
* *
+ * Copyright (C) 2007,2008 Ųyvind Harboe *
+ * [email protected] *
+ * *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
@@ -111,22 +114,14 @@
fields[0].tap = arm7_9->jtag_info.tap;
fields[0].num_bits = 1;
fields[0].out_value = NULL;
-
fields[0].in_value = &breakpoint;
-
-
fields[0].in_handler = NULL;
-
fields[1].tap = arm7_9->jtag_info.tap;
fields[1].num_bits = 32;
fields[1].out_value = NULL;
-
fields[1].in_value = databus;
-
-
fields[1].in_handler = NULL;
-
if((retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1)) !=
ERROR_OK)
{
@@ -198,24 +193,23 @@
fields[0].tap = jtag_info->tap;
fields[0].num_bits = 1;
fields[0].out_value = NULL;
-
fields[0].in_value = NULL;
-
-
fields[0].in_handler = NULL;
-
+
fields[1].tap = jtag_info->tap;
fields[1].num_bits = 32;
fields[1].out_value = NULL;
-
- fields[1].in_value = NULL;
- fields[1].in_handler = arm_jtag_buf_to_u32_flip; /* deprecated! invoke
this from user code! */
- fields[1].in_handler_priv = in;
-
-
+ u8 tmp[4];
+ fields[1].in_value = tmp;
+ fields[1].in_handler = NULL;
+
+ jtag_add_dr_scan_now(2, fields, TAP_INVALID);
- jtag_add_dr_scan(2, fields, TAP_INVALID);
+ if (jtag_error==ERROR_OK)
+ {
+ *in=flip_u32(le_to_h_u32(tmp), 32);
+ }
jtag_add_runtest(0, TAP_INVALID);
@@ -259,17 +253,13 @@
fields[0].tap = jtag_info->tap;
fields[0].num_bits = 1;
fields[0].out_value = NULL;
-
fields[0].in_value = NULL;
-
-
fields[0].in_handler = NULL;
-
+
fields[1].tap = jtag_info->tap;
fields[1].num_bits = 32;
fields[1].out_value = NULL;
-
fields[1].in_value = NULL;
switch (size)
{
@@ -284,8 +274,8 @@
break;
}
fields[1].in_handler_priv = in;
-
-
+
+
jtag_add_dr_scan(2, fields, TAP_INVALID);
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