# script for stm32g0x family

#
# stm32g0 devices support SWD transports only.
#
source [find interface/stlink.cfg]
source [find target/swj-dp.tcl]
source [find mem_helper.tcl]

if { [info exists CHIPNAME] } {
	set _CHIPNAME $CHIPNAME
} else {
	set _CHIPNAME stm32g0x
}

set _ENDIAN little

# Work-area is a space in RAM used for flash programming
# Smallest proposed target has 8kB ram, use 4kB by default to avoid surprises
if { [info exists WORKAREASIZE] } {
	set _WORKAREASIZE $WORKAREASIZE
} else {
	set _WORKAREASIZE 0x1000
}

#jtag scan chain
if { [info exists CPUTAPID] } {
	set _CPUTAPID $CPUTAPID
} else {
	# Section 37.5.5 - corresponds to Cortex-M0+
	set _CPUTAPID 0x0bc11477
}

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

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

# reasonable default
adapter speed 2000

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
}

proc stm32g0x_default_reset_start {} {
	# Reset clock is HSI16 (16 MHz)
	adapter speed 2000
}

proc stm32g0x_default_examine_end {} {
	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP
	mmw 0x40015804 0x00000006 0

	# Stop watchdog counters during halt
	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
	mmw 0x40015808 0x00001800 0
}

proc stm32g0x_default_reset_init {} {
	# Increase clock to 64 Mhz
	mmw 0x40022000 0x00000002 0x00000005	;# FLASH_ACR: Latency = 2
	mww 0x4002100C 0x30000802				;# RCC_PLLCFGR = PLLR=/2, PLLN=8, PLLM=/1, PLLSRC=0x2
	mmw 0x40021000 0x01000000 0x00000000	;# RCC_CR |= PLLON
	mmw 0x40021008 0x00000002 0x00000005	;# RCC_CFGR: SW=PLLRCLK

	# Boost JTAG frequency
	adapter speed 4000
}

# Default hooks
$_TARGETNAME configure -event examine-end { stm32g0x_default_examine_end }
$_TARGETNAME configure -event reset-start { stm32g0x_default_reset_start }
$_TARGETNAME configure -event reset-init { stm32g0x_default_reset_init }
