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jtag: add wait_srst_deassert command 

Useful to do something *real quick* after a SRST deassert.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
This commit is contained in:
Øyvind Harboe 2011-02-24 15:19:27 +01:00
parent 6ddcee7d20
commit c3c6a6e1d4
1 changed files with 51 additions and 0 deletions
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51
src/jtag/tcl.c
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@ -40,6 +40,8 @@
#include <strings.h>
#endif
#include <helper/time_support.h>
/**
* @file
* Holds support for accessing JTAG-specific mechanisms from TCl scripts.
@ -1266,6 +1268,46 @@ COMMAND_HANDLER(handle_jtag_flush_queue_sleep)
return ERROR_OK;
}
COMMAND_HANDLER(handle_wait_srst_deassert)
{
if (CMD_ARGC != 1)
return ERROR_COMMAND_SYNTAX_ERROR;
int timeout_ms;
COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], timeout_ms);
if ((timeout_ms <= 0) || (timeout_ms > 100000))
{
LOG_ERROR("Timeout must be an integer between 0 and 100000");
return ERROR_FAIL;
}
LOG_USER("Waiting for srst assert + deassert for at most %dms", timeout_ms);
int asserted_yet;
long long then = timeval_ms();
while (jtag_srst_asserted(&asserted_yet) == ERROR_OK)
{
if ((timeval_ms() - then) > timeout_ms)
{
LOG_ERROR("Timed out");
return ERROR_FAIL;
}
if (asserted_yet)
break;
}
while (jtag_srst_asserted(&asserted_yet) == ERROR_OK)
{
if ((timeval_ms() - then) > timeout_ms)
{
LOG_ERROR("Timed out");
return ERROR_FAIL;
}
if (!asserted_yet)
break;
}
return ERROR_OK;
}
static const struct command_registration jtag_command_handlers[] = {
@ -1357,6 +1399,15 @@ static const struct command_registration jtag_command_handlers[] = {
/* Specifically for working around DRIVER bugs... */
.usage = "['short'|'long']",
},
{
.name = "wait_srst_deassert",
.handler = handle_wait_srst_deassert,
.mode = COMMAND_ANY,
.help = "Wait for an SRST deassert. "
"Useful for cases where you need something to happen within ms "
"of an srst deassert. Timeout in ms ",
.usage = "ms",
},
{
.name = "jtag",
.mode = COMMAND_ANY,