//! Target power has been externally cycled. Holds BKPT/BKGD low while Vdd rises
//!
//! @return
//! \ref BDM_RC_OK => Success \n
//! \ref BDM_RC_VDD_NOT_PRESENT => various errors
//
U8 bdmCF_powerOnReset(void) {
U8 rc = 0;
#if (HW_CAPABILITY&CAP_VDDSENSE)
bdmcf_interfaceIdle(); // Make sure BDM interface is idle
BKPT_LOW();
// Wait for Vdd to rise within 50% of 3V and RESET to return high
// RESET rise may be delayed by target POR
WAIT_WITH_TIMEOUT_MS( 250 /* ms */, (bdm_targetVddMeasure()>75)&&
(!bdm_option.useResetSignal)||RESET_IS_HIGH);
// Let signals settle & CPU to finish reset (with BKGD held low)
WAIT_MS(BKGD_WAITus);
if (bdm_targetVddMeasure()<=70) // Vpp didn't turn on!
rc = BDM_RC_VDD_NOT_PRESENT;
if (bdm_option.useResetSignal && (!RESET_IS_HIGH)) // RESET didn't rise
rc = BDM_RC_RESET_TIMEOUT_RISE;
bdmcf_interfaceIdle(); // Make sure BDM interface is idle (BKGD now high)
// Let signals settle
WAIT_MS(RESET_SETTLEms);
cable_status.reset = RESET_DETECTED; // Record the fact that reset was asserted
#endif // (HW_CAPABILITY&CAP_VDDSENSE)
return(rc);
}
//! Turns on Target Vdd if enabled.
//!
//! @return
//! \ref BDM_RC_OK => Target Vdd confirmed on target \n
//! \ref BDM_RC_VDD_NOT_PRESENT => Target Vdd not present
//!
uint8_t bdm_setTargetVdd( void ) {
uint8_t rc = BDM_RC_OK;
#if (HW_CAPABILITY&CAP_VDDSENSE)
DISABLE_VDD_SENSE_INT();
#endif
switch (bdm_option.targetVdd) {
case BDM_TARGET_VDD_OFF :
VDD_OFF();
// Check for externally supplied target Vdd (> 2 V)
WAIT_US(VDD_RISE_TIMEus); // Wait for Vdd to rise & stabilise
if (bdm_targetVddMeasure()<VDD_2v)
rc = BDM_RC_VDD_NOT_PRESENT;
break;
case BDM_TARGET_VDD_3V3 :
VDD3_ON();
// Wait for Vdd to rise to 90% of 3V
WAIT_WITH_TIMEOUT_MS( 100 /* ms */, (bdm_targetVddMeasure()>VDD_3v3));
WAIT_US(VDD_RISE_TIMEus); // Wait for Vdd to rise & stabilise
if (bdm_targetVddMeasure()<VDD_3v3) {
VDD_OFF(); // In case of Vdd overload
rc = BDM_RC_VDD_NOT_PRESENT;
}
break;
case BDM_TARGET_VDD_5V :
VDD5_ON();
// Wait for Vdd to rise to 90% of 5V
WAIT_WITH_TIMEOUT_MS( 100 /* ms */, (bdm_targetVddMeasure()>VDD_5v));
WAIT_US(VDD_RISE_TIMEus); // Wait for Vdd to rise & stabilise
if (bdm_targetVddMeasure()<VDD_5v) {
VDD_OFF(); // In case of Vdd overload
rc = BDM_RC_VDD_NOT_PRESENT;
}
break;
}
#if (HW_CAPABILITY&CAP_VDDSENSE)
CLEAR_VDD_SENSE_FLAG(); // Clear Vdd Change Event
ENABLE_VDD_SENSE_INT();
#endif
(void)bdm_checkTargetVdd(); // Update Target Vdd LED & status
return (rc);
}
