# script for stm32wlx family

#
# stm32wl 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 stm32wlx
}

set _ENDIAN little

# Work-area is a space in RAM used for flash programming
# By default use 20kB
if { [info exists WORKAREASIZE] } {
	set _WORKAREASIZE $WORKAREASIZE
} else {
	set _WORKAREASIZE 0x5000
}

#jtag scan chain
if { [info exists CPUTAPID] } {
	set _CPUTAPID $CPUTAPID
} else {
	if { [using_jtag] } {
		set _CPUTAPID 0x6ba00477
	} else {
		# SWD IDCODE (single drop, arm)
		set _CPUTAPID 0x6ba02477
	}
}

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 speed 500

adapter srst 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 4 MHz.
	# Configure system to use MSI 24 MHz clock, compliant with VOS default Range1.
	# 2 WS compliant with VOS=Range1 and 24 MHz.
	mmw 0x58004000 0x00000102 0  ;# FLASH_ACR |= PRFTEN | 2(Latency)
	mmw 0x58000000 0x00000091 0  ;# RCC_CR = MSI_ON | MSI Range 24 MHz
	# Boost JTAG frequency
	adapter speed 4000
}

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

$_TARGETNAME configure -event examine-end {
	# Enable debug during low power modes (uses more power)
	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP | DBG_SLEEP
	mmw 0xE0042004 0x00000007 0

	# Stop watchdog counters during halt
	# DBGMCU_APB1_FZR1 |= DBG_IWDG_STOP | DBG_WWDG_STOP
	mmw 0xE004203C 0x00001800 0
}

$_TARGETNAME configure -event trace-config {
	# nothing to do
}