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jtag/drivers cmsis-dap: fix speed setting on Atmel EDBG 

Without the change Atmel EDBG uses default clock freq about 168 kHz
instead adapter_khz configured before interface init.
Changing adapter speed after init works as expected.

Testing shows the EDBG firmware resets speed to default during DAP_SWJ_Sequence.
Tested with fw versions 03.1F.01AE and 02.09.0169

This change repeats the DAP_SWJ_Clock command after sending a SWJ sequence.

Change-Id: Ic70457c5df635f47cad5e70b0dc83a083ea1b3a3
Reported-by: Ladislav Laska <laska@kam.mff.cuni.cz>
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/3944
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
This commit is contained in:
Tomas Vanek 2017-01-09 15:30:21 +01:00 committed by Freddie Chopin
parent 668347e824
commit 34eb2933d4
1 changed files with 7 additions and 1 deletions
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8
src/jtag/drivers/cmsis_dap_usb.c
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@ -821,7 +821,13 @@ static int cmsis_dap_swd_switch_seq(enum swd_special_seq seq)
return ERROR_FAIL;
}
return cmsis_dap_cmd_DAP_SWJ_Sequence(s_len, s);
retval = cmsis_dap_cmd_DAP_SWJ_Sequence(s_len, s);
if (retval != ERROR_OK)
return retval;
/* Atmel EDBG needs renew clock setting after SWJ_Sequence
* otherwise default frequency is used */
return cmsis_dap_cmd_DAP_SWJ_Clock(jtag_get_speed_khz());
}
static int cmsis_dap_swd_open(void)