riscv-openocd/tcl/target/stm32l.cfg

# script for stm32l

#
# stm32 devices support both JTAG and SWD transports.
#
source [find target/swj-dp.tcl]

if { [info exists CHIPNAME] } {
   set _CHIPNAME $CHIPNAME
} else {
   set _CHIPNAME stm32l
}

if { [info exists ENDIAN] } {
   set _ENDIAN $ENDIAN
} else {
   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 100

adapter_nsrst_delay 100
if {$using_jtag} {
 jtag_ntrst_delay 100
}

#jtag scan chain
if { [info exists CPUTAPID] } {
   set _CPUTAPID $CPUTAPID
} else {
  # See STM Document RM0038
  # Section 24.6.3
   set _CPUTAPID 0x4ba00477
}

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

if { [info exists BSTAPID] } {
   # FIXME this never gets used to override defaults...
   set _BSTAPID $BSTAPID
} else {
  # See STM Document RM0038
  # Section 24.6.2
  set _BSTAPID 0x06416041
}

if {$using_jtag} {
 jtag newtap $_CHIPNAME bs -irlen 5 -expected-id $_BSTAPID
}

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

# 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
}