# # script for ATMEL sam4, a CORTEX-M4 chip # # # sam4 devices can support both JTAG and SWD transports. # source [find target/swj-dp.tcl] if { [info exists CHIPNAME] } { set _CHIPNAME $CHIPNAME } else { set _CHIPNAME sam4 } 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 64kB if { [info exists WORKAREASIZE] } { set _WORKAREASIZE $WORKAREASIZE } else { set _WORKAREASIZE 0x4000 } #jtag scan chain if { [info exists CPUTAPID] } { set _CPUTAPID $CPUTAPID } else { set _CPUTAPID 0x4ba00477 } swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID set _TARGETNAME $_CHIPNAME.cpu target create $_TARGETNAME cortex_m -endian $_ENDIAN -chain-position $_TARGETNAME # 16K is plenty, the smallest chip has this much $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0 # JTAG speed should be <= F_CPU/6. F_CPU after reset is 4 MHz, so use F_JTAG = 0.5MHz # # 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 500 adapter_nsrst_delay 100 if {[using_jtag]} { jtag_ntrst_delay 100 } if {![using_hla]} { # if srst is not fitted use SYSRESETREQ to # perform a soft reset cortex_m reset_config sysresetreq }