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Sample Assembly Code to Erase and Reprogram the TMS320F240
PRELIMINARY
A-42
PRELIMINARY
F240INIT: ;Set Data Page pointer to page 1 of the
;peripheral frame
LDP #DP_PF1 ;Page DP_PF1 includes WET through *
;EINT frames
;initialize WDT registers
SPLK #06Fh, WDCR ;clear WDFLAG, Disable WDT
;(if Vpp=5V), set WDT
;for 1 second overflow (max)
SPLK #07h, RTICR ;clear RTI Flag,
;set RTI for 1 second overflow
;(max)
;EVM 10–MHz oscillator settings.
;(XTAL2 open, OSCBYP_=GND)
SPLK #00B1h,CKCR1 ;CLKIN(OSC)=10MHz,
;Mult by 2, Div by 1.
SPLK #00C3h,CKCR0 ;CLKMD=PLL Enable,SYSCLK=CPUCLK/2
;Clear reset flag bits in SYSSR
;(PORRST, PLLRST, ILLRST, SWRST, WDRST)
LACL SYSSR ;ACCL <= SYSSR
AND #00FFh ;Clear upper 8 bits of SYSSR
SACL SYSSR ;Load new value into SYSSR
**********************************************************
** First, erase flash1 by invoking the clear and erase **
** algorithms. **
** Note: Three parameters must be initialized before **
** calling the algorithms. **
**********************************************************
LDP #PARMS
SPLK #0,ERS_COUNT ;Set erase fail count to 0.
**********Put parameters where they belong.**********
SPLK #0ff00h,PROTECT
SPLK #00000h,SEG_ST
SPLK #03FFFh,SEG_END
***********First, clear flash ************
ers_loop:
CALL GCLR ;Clear flash.
LACL ERROR ;Check for CLEAR/ERASE error
clrerr: BCND ers_error,neq ;If error, then hard fail.
***********Next erase flash ************
CALL GERS ;Erase flash.
LACL ERROR ;Check for CLEAR/ERASE error
BCND depletion,neq ;If error, then try Flash–write.
B ers_done ;Else, no errors erasing.