#
# stm32l1 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 stm32l1
}

set _ENDIAN little

# Work-area is a space in RAM used for flash programming
# By default use 10kB
if { [info exists WORKAREASIZE] } {
   set _WORKAREASIZE $WORKAREASIZE
} else {
   set _WORKAREASIZE 0x2800
}

# JTAG speed should be <= F_CPU/6.
# F_CPU after reset is 2MHz, so use F_JTAG max = 333kHz
adapter_khz 300

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

#jtag scan chain
if { [info exists CPUTAPID] } {
   set _CPUTAPID $CPUTAPID
} else {
   if { [using_jtag] } {
      # See STM Document RM0038
      # Section 30.6.3 - corresponds to Cortex-M3 r2p0
      set _CPUTAPID 0x4ba00477
   } else {
      # SWD IDCODE (single drop, arm)
      set _CPUTAPID 0x2ba01477
   }
}

swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID

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

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

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

# flash size will be probed
set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME stm32lx 0x08000000 0 0 0 $_TARGETNAME

reset_config srst_nogate

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

proc stm32l_enable_HSI {} {
	# Enable HSI as clock source
	echo "STM32L: Enabling HSI"

	# Set HSION in RCC_CR
	mww 0x40023800 0x00000101

	# Set HSI as SYSCLK
	mww 0x40023808 0x00000001

	# Increase JTAG speed
	adapter_khz 2000
}

$_TARGETNAME configure -event reset-init {
	stm32l_enable_HSI
}

$_TARGETNAME configure -event reset-start {
	adapter_khz 300
}

$_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
}
