/**
* Put the debug link into SWD mode, if the target supports it.
* The link's initial mode may be either JTAG (for example,
* with SWJ-DP after reset) or SWD.
*
* @param target Enters SWD mode (if possible).
*
* Note that targets using the JTAG-DP do not support SWD, and that
* some targets which could otherwise support it may have have been
* configured to disable SWD signaling
*
* @return ERROR_OK or else a fault code.
*/
int dap_to_swd(struct target *target)
{
struct arm *arm = target_to_arm(target);
int retval;
if (!arm->dap) {
LOG_ERROR("SWD mode is not available");
return ERROR_FAIL;
}
LOG_DEBUG("Enter SWD mode");
/* REVISIT it's ugly to need to make calls to a "jtag"
* subsystem if the link may not be in JTAG mode...
*/
retval = jtag_add_tms_seq(8 * sizeof(jtag2swd_bitseq),
jtag2swd_bitseq, TAP_INVALID);
if (retval == ERROR_OK)
retval = jtag_execute_queue();
/* set up the DAP's ops vector for SWD mode. */
arm->dap->ops = &swd_dap_ops;
return retval;
}
/** Put the debug link into JTAG mode, if the target supports it.
* The link's initial mode may be either SWD or JTAG.
*
* @param target Enters JTAG mode (if possible).
*
* Note that targets implemented with SW-DP do not support JTAG, and
* that some targets which could otherwise support it may have been
* configured to disable JTAG signaling
*
* @return ERROR_OK or else a fault code.
*/
int dap_to_jtag(struct target *target)
{
int retval;
LOG_DEBUG("Enter JTAG mode");
/* REVISIT it's nasty to need to make calls to a "jtag"
* subsystem if the link isn't in JTAG mode...
*/
retval = jtag_add_tms_seq(8 * sizeof(swd2jtag_bitseq),
swd2jtag_bitseq, TAP_RESET);
if (retval == ERROR_OK)
retval = jtag_execute_queue();
/* REVISIT set up the DAP's ops vector for JTAG mode. */
return retval;
}
