tinyriscv-openocd/tcl/target/stm32f4x.cfg

# script for stm32f4x family

#
# stm32 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 stm32f4x
}

set _ENDIAN little

# Work-area is a space in RAM used for flash programming
# By default use 32kB (Available RAM in smallest device STM32F410)
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 RM0090
      # Section 38.6.3 - corresponds to Cortex-M4 r0p1
      set _CPUTAPID 0x4ba00477
   } {
      set _CPUTAPID 0x2ba01477
   }
}

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

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

set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME stm32f2x 0 0 0 0 $_TARGETNAME

# JTAG speed should be <= F_CPU/6. F_CPU after reset is 16MHz, so use F_JTAG = 2MHz
#
# Since we may be running of an RC oscilator, we crank down the speed a
# bit more to be on the safe side. Perhaps superstition, but if are
# running off a crystal, we can run closer to the limit. Note
# that there can be a pretty wide band where things are more or less stable.
adapter_khz 2000

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 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_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
}

$_TARGETNAME configure -event reset-init {
	# Configure PLL to boost clock to HSI x 4 (64 MHz)
	mww 0x40023804 0x08012008   ;# RCC_PLLCFGR 16 Mhz /8 (M) * 128 (N) /4(P)
	mww 0x40023C00 0x00000102   ;# FLASH_ACR = PRFTBE | 2(Latency)
	mmw 0x40023800 0x01000000 0 ;# RCC_CR |= PLLON
	sleep 10                    ;# Wait for PLL to lock
	mmw 0x40023808 0x00001000 0 ;# RCC_CFGR |= RCC_CFGR_PPRE1_DIV2
	mmw 0x40023808 0x00000002 0 ;# RCC_CFGR |= RCC_CFGR_SW_PLL

	# Boost JTAG frequency
	adapter_khz 8000
}

$_TARGETNAME configure -event reset-start {
	# Reduce speed since CPU speed will slow down to 16MHz with the reset
	adapter_khz 2000
}