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Cortex-M: Try harder to halt devices in WFI. 

E.g. STM32F7 and L0 need multiple C_DEBUG and C_HALT commands to halt
the device.
This commit is contained in:
Uwe Bonnes 2018-06-13 12:17:00 +02:00
parent 44fc24e0e7
commit 9e365a58f7
1 changed files with 31 additions and 8 deletions
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39
src/target/cortexm.c
View File

@ -237,6 +237,33 @@ static void cortexm_priv_free(void *priv)
free(priv);
}
static bool cortexm_forced_halt(target *t)
{
uint32_t start_time = platform_time_ms();
platform_srst_set_val(false);
/* Wait until SRST is released.*/
while (platform_time_ms() < start_time + 2000) {
if (!platform_srst_get_val())
break;
}
if (platform_srst_get_val())
return false;
uint32_t dhcsr = 0;
start_time = platform_time_ms();
/* Try hard to halt the target. STM32F7 in WFI
needs multiple writes!*/
while (platform_time_ms() < start_time + 2000) {
dhcsr = target_mem_read32(t, CORTEXM_DHCSR);
if (dhcsr == (CORTEXM_DHCSR_S_HALT | CORTEXM_DHCSR_S_REGRDY |
CORTEXM_DHCSR_C_HALT | CORTEXM_DHCSR_C_DEBUGEN))
break;
target_halt_request(t);
}
if (dhcsr != 0x00030003)
return false;
return true;
}
bool cortexm_probe(ADIv5_AP_t *ap)
{
target *t;
@ -296,8 +323,10 @@ bool cortexm_probe(ADIv5_AP_t *ap)
target_check_error(t);
}
if (!cortexm_forced_halt(t))
return false;
#define PROBE(x) \
do { if ((x)(t)) return true; else target_check_error(t); } while (0)
do { if ((x)(t)) {target_halt_resume(t, 0); return true;} else target_check_error(t); } while (0)
PROBE(stm32f1_probe);
PROBE(stm32f4_probe);
@ -325,16 +354,12 @@ bool cortexm_attach(target *t)
struct cortexm_priv *priv = t->priv;
unsigned i;
uint32_t r;
int tries;
/* Clear any pending fault condition */
target_check_error(t);
target_halt_request(t);
tries = 10;
while(!platform_srst_get_val() && !target_halt_poll(t, NULL) && --tries)
platform_delay(200);
if(!tries)
if (!cortexm_forced_halt(t))
return false;
/* Request halt on reset */
@ -370,8 +395,6 @@ bool cortexm_attach(target *t)
target_mem_write32(t, CORTEXM_FPB_CTRL,
CORTEXM_FPB_CTRL_KEY | CORTEXM_FPB_CTRL_ENABLE);
platform_srst_set_val(false);
return true;
}