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stlink_usb: Changes to make connect_under_reset work 

Leaving mode before closing added
Resolved a collision with JTAG API v1 error/status
checking overwriting SWIM status bytes

Change-Id: I35444ec0e6caace3e072c60085059602f4cdf0a4
Signed-off-by: Ake Rehnman <ake.rehnman@gmail.com>
Reviewed-on: http://openocd.zylin.com/4265
Tested-by: jenkins
Reviewed-by: Philipp Klaus Krause
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Ake Rehnman 2017-11-04 19:12:17 +01:00 committed by Paul Fertser
parent 3de6b5f6e5
commit a6dea119a3
1 changed files with 56 additions and 15 deletions
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71
src/jtag/drivers/stlink_usb.c
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@ -425,10 +425,6 @@ static int stlink_usb_error_check(void *handle)
assert(handle != NULL);
/* TODO: no error checking yet on api V1 */
if (h->jtag_api == STLINK_JTAG_API_V1)
h->databuf[0] = STLINK_DEBUG_ERR_OK;
if (h->transport == HL_TRANSPORT_SWIM) {
switch (h->databuf[0]) {
case STLINK_SWIM_ERR_OK:
@ -441,6 +437,10 @@ static int stlink_usb_error_check(void *handle)
}
}
/* TODO: no error checking yet on api V1 */
if (h->jtag_api == STLINK_JTAG_API_V1)
h->databuf[0] = STLINK_DEBUG_ERR_OK;
switch (h->databuf[0]) {
case STLINK_DEBUG_ERR_OK:
return ERROR_OK;
@ -904,23 +904,29 @@ static int stlink_usb_init_mode(void *handle, bool connect_under_reset)
return ERROR_FAIL;
}
/* preliminary SRST assert:
* We want SRST is asserted before activating debug signals (mode_enter).
* As the required mode has not been set, the adapter may not know what pin to use.
* Tested firmware STLINK v2 JTAG v29 API v2 SWIM v0 uses T_NRST pin by default
* Tested firmware STLINK v2 JTAG v27 API v2 SWIM v6 uses T_NRST pin by default
* after power on, SWIM_RST stays unchanged */
if (connect_under_reset && emode != STLINK_MODE_DEBUG_SWIM)
stlink_usb_assert_srst(handle, 0);
/* do not check the return status here, we will
proceed and enter the desired mode below
and try asserting srst again. */
res = stlink_usb_mode_enter(handle, emode);
if (res != ERROR_OK)
return res;
/* assert SRST again: a little bit late but now the adapter knows for sure what pin to use */
if (connect_under_reset) {
/* if we are going to use swim we need to switch mode early */
if (emode == STLINK_MODE_DEBUG_SWIM) {
res = stlink_usb_mode_enter(handle, emode);
if (res != ERROR_OK)
return res;
}
res = stlink_usb_assert_srst(handle, 0);
if (res != ERROR_OK)
return res;
}
res = stlink_usb_mode_enter(handle, emode);
if (res != ERROR_OK)
return res;
res = stlink_usb_current_mode(handle, &mode);
if (res != ERROR_OK)
@ -1949,8 +1955,43 @@ static int stlink_speed(void *handle, int khz, bool query)
/** */
static int stlink_usb_close(void *handle)
{
int res;
uint8_t mode;
enum stlink_mode emode;
struct stlink_usb_handle_s *h = handle;
if (h && h->fd)
res = stlink_usb_current_mode(handle, &mode);
else
res = ERROR_FAIL;
/* do not exit if return code != ERROR_OK,
it prevents us from closing jtag_libusb */
if (res == ERROR_OK) {
/* try to exit current mode */
switch (mode) {
case STLINK_DEV_DFU_MODE:
emode = STLINK_MODE_DFU;
break;
case STLINK_DEV_DEBUG_MODE:
emode = STLINK_MODE_DEBUG_SWD;
break;
case STLINK_DEV_SWIM_MODE:
emode = STLINK_MODE_DEBUG_SWIM;
break;
case STLINK_DEV_BOOTLOADER_MODE:
case STLINK_DEV_MASS_MODE:
default:
emode = STLINK_MODE_UNKNOWN;
break;
}
if (emode != STLINK_MODE_UNKNOWN)
stlink_usb_mode_leave(handle, emode);
/* do not check return code, it prevent
us from closing jtag_libusb */
}
if (h && h->fd)
jtag_libusb_close(h->fd);