# script for stm32l4x family

#
# stm32l4 devices support both JTAG and SWD transports.
#
source [find target/swj-dp.tcl]
source [find mem_helper.tcl]

if { [info exists CHIPNAME] } {
   set _CHIPNAME $CHIPNAME
} else {
   set _CHIPNAME stm32l4x
}

set _ENDIAN little

# Work-area is a space in RAM used for flash programming
# Smallest current target has 64kB ram, use 32kB by default to avoid surprises
if { [info exists WORKAREASIZE] } {
   set _WORKAREASIZE $WORKAREASIZE
} else {
   set _WORKAREASIZE 0x8000
}

#jtag scan chain
if { [info exists CPUTAPID] } {
   set _CPUTAPID $CPUTAPID
} else {
   if { [using_jtag] } {
      # See STM Document RM0351
      # Section 44.6.3 - corresponds to Cortex-M4 r0p1
      set _CPUTAPID 0x4ba00477
   } {
      set _CPUTAPID 0x2ba01477
   }
}

swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu

if {[using_jtag]} {
   jtag newtap $_CHIPNAME bs -irlen 5
}

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap

$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0

set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME

# Common knowledges tells JTAG speed should be <= F_CPU/6.
# F_CPU after reset is MSI 4MHz, so use F_JTAG = 500 kHz to stay on
# the safe side.
#
# Note that there is a pretty wide band where things are
# more or less stable, see http://openocd.zylin.com/#/c/3366/
adapter_khz 500

adapter_nsrst_delay 100
if {[using_jtag]} {
 jtag_ntrst_delay 100
}

reset_config srst_nogate

if {![using_hla]} {
   # if srst is not fitted use SYSRESETREQ to
   # perform a soft reset
   cortex_m reset_config sysresetreq
}

$_TARGETNAME configure -event reset-init {
	# CPU comes out of reset with MSI_ON | MSI_RDY | MSI Range 6 (4 MHz).
	# Use MSI 24 MHz clock, compliant even with VOS == 2.
	# 3 WS compliant with VOS == 2 and 24 MHz.
	mww 0x40022000 0x00000103   ;# FLASH_ACR = PRFTBE | 3(Latency)
	mww 0x40021000 0x00000099   ;# RCC_CR = MSI_ON | MSIRGSEL | MSI Range 9
	# Boost JTAG frequency
	adapter_khz 4000
}

$_TARGETNAME configure -event reset-start {
	# Reset clock is MSI (4 MHz)
	adapter_khz 500
}

$_TARGETNAME configure -event examine-end {
	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP | DBG_SLEEP
	mmw 0xE0042004 0x00000007 0

	# Stop watchdog counters during halt
	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
	mmw 0xE0042008 0x00001800 0
}

$_TARGETNAME configure -event trace-config {
	# Set TRACE_IOEN; TRACE_MODE is set to async; when using sync
	# change this value accordingly to configure trace pins
	# assignment
	mmw 0xE0042004 0x00000020 0
}
