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Ensure Cortex-M reset wakes device from sleep (wfi/wfe) 

Change-Id: Idb52ca3123bb3e2f7863ba1b82ac9b176d7cb094
Signed-off-by: Evan Hunter <ehunter@broadcom.com>
Reviewed-on: http://openocd.zylin.com/833
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Evan Hunter 2012-10-12 07:24:11 +11:00 committed by Spencer Oliver
parent 452248af1d
commit 6663a788a5
1 changed files with 8 additions and 0 deletions
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8
src/target/cortex_m.c
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@ -973,6 +973,14 @@ static int cortex_m3_assert_reset(struct target *target)
return retval; return retval;
} }
/* If the processor is sleeping in a WFI or WFE instruction, the
* C_HALT bit must be asserted to regain control */
if (cortex_m3->dcb_dhcsr & S_SLEEP) {
retval = mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN);
if (retval != ERROR_OK)
return retval;
}
retval = mem_ap_write_u32(swjdp, DCB_DCRDR, 0); retval = mem_ap_write_u32(swjdp, DCB_DCRDR, 0);
if (retval != ERROR_OK) if (retval != ERROR_OK)
return retval; return retval;