Texas Instruments TMS320F20x/F24x DSP manual Gclr, Segst,Segend,Protect, PARMS+1, PARMS+2, PARMS+3

Page 80

C-Callable Interface to Flash Algorithms

PRELIMINARY

;**Variables included from flash algorithms.

.include ºsvar20.hº

;Variable declarations

.ref

GCLR

;References clear algo.

.ref

GPGMJ

;References program algo.

.ref

GERS

;References erase algo.

.ref

FLWS

;References flash±write algo.

;**Parameters used by flash algorithms.

.def

PRG_bufaddr, PRG_paddr

.def

PRG_length, PARMS

.def

SEG_ST,SEG_END,PROTECT

*************************************************************

VARS: .usect ºPRG_dataº,16 ;This is an uninitialized data

*

;section required by the standard *

;flash algos for temporary

*

;variables. Pointers to this

*

;space are hardcoded in SVAR20.H, *

;and variables are init'd at

*

;run time.

*

*************************************************************

PARMS: .usect ºPRG_parmº,10 ;This is an uninitialized data

*

;section used for temporary

*

;variables and for passing

*

;parameters to the flash

*

;algorithms.

*

*************************************************************

PROTECT .set PARMS ;Segment enable bits.*

*************************************************************

*****Parameters needed for Programming algorithm. ********

*************************************************************

PRG_bufaddr

.set

PARMS+1

;Addr of buffer for pgm data

*

PRG_paddr

.set

PARMS+2

;First flash addr to program

*

PRG_length

.set

PARMS+3

;Length of block to program

*

*************************************************************

**Parameters needed for CLEAR, ERASE, and FLW algorithms. *

*************************************************************

SEG_ST

.set

PARMS+4

;Segment

start address.

*

SEG_END

.set

PARMS+5

;Segment

end address.

*

*************************************************************

****Other misc variables.****

*************************************************************

ERS_COUNT .set

PARMS+6

;Used

for erase fail count.

*

SV_AR1

.set

PARMS+7

;Used

to save AR1.

*

**************************************************************

.sect ºPRG_textº

**********************************************************

*

function erase(PROTECT,SEG_ST,SEG_END)

*

* Status is returned in the accumulator.

*

*

0 = Fail,1 = Pass

*

**********************************************************

*

This function performs the clear and erase operation

*

*

on the 'F2XX flash. If the erase operation fails, the *

*

flash±write operation is used to try to recover from

*

*

depletion. If the array recovers, the entire process

*

*

(clr+ers+flw) is repeated a maximum of 10 times. The

*

*

return value indicates the status. If this function

*

A-28

PRELIMINARY

Page 79 Page 81
Image 80
Page 79 Page 81
Contents Literature Number SPRU282 September Important Notice Read This First Preliminary Related Documentation From Texas Instruments Preliminary If You Need Assistance Viii Contents Contents Figures Tables Introduction Basic Concepts of Flash Memory Technology TMS320F20x/F24x Flash Module ±1. TMS320 Devices With On-Chip Flash Eeprom±1. TMS320F20x/F24x Program Space Memory Maps Benefits of Embedded Flash Memory in a DSP System Preliminary Flash Operations and Control Registers TopicPreliminary Flash Operations and Control Registers ±1. Flash Memory Logic Levels During Programming and Erasing Accessing the Flash Module ±2. Memory Maps in Register and Array Access Modes 1 TMS320F206 Flash Access-Control Register2 TMS320F24x Flash Access-Control Register OUTFlash Module Control Registers Segment Control Register Segctr±3. Segment Control Register Field Descriptions Flash Test Register TST Write Address Register WadrsWrite Data Register Wdata Read Modes Program Operation Erase Operation Recovering From Over-Erasure Flash-Write Operation Reading From the Flash Array Protecting the ArrayAlgorithm Implementations Software Considerations How the Algorithms Fit Into the Program-Erase-Reprogram Flow ±1. Algorithms in the Overall Flow Programming or Clear Algorithm ±2. The Programming Algorithm in the Overall FlowPreliminary ±3. Programming or Clear Algorithm Flow Step Action Description Mask the data to program Preliminary Erase Algorithm ±4. Erase Algorithm in the Overall Flow±2. Steps for Applying One Erase Pulse Preliminary ±5. Erase Algorithm Flow Flash-Write Algorithm ±6. Flash-Write Algorithm in the Overall Flow±3. Steps for Applying One Flash-Write Pulse ±7. Flash-Write Algorithm Flow Preliminary Preliminary Assembly Source Listings Program Examples Assembly Source for Algorithms Header File for Constants and Variables, SVAR20.HError BASE0BASE+0 BASE1Constants D5KD7K DloopClear Algorithm, SCLR20.ASM SegstSegend ProtectGclr PROTECT,SEGST,SEGEND DELAY,REGS,ARRAY Splk #0,ERRORAR0 AR1Exit Splk #1,ERROR Sacl FlstLacl Fladrs NewrowActivate Write BIT Tblw SPAD1 Execute Command LAR SET Delay Call DELAY,*,AR6 Wait Stop Write Operation SplkShutdown Write Operation Tblw SPAD1 Execute Command LAR Tblr FldataTblw SPAD1 Execute Command LAR Prgbyte Call SETRDVER0Lacl BASE2 Bcnd PBDONE,EQErase Algorithm, SERA20.ASM Erase Command Word Erase Exebin Command WordInverse Erase Command Word Flash Write Command WordClrc OVM Sacl FlendCall Setmode XoreraseSplk #STOP,BASE0 Inverase Splk #INVER,BASE0 Call SetmodeBldd Nextivers Lacl BASE1Flash Stop command, and Ffff for Wdata Flash-Write Algorithm, SFLW20.ASM Bldd #FLST,BASE1 MaxflwFlws Call Array Access Flash Array Done Call DELAY,*,AR6Bcnd Flwrite SplkLAR AR0,#MAXFLW Cmpr Setmode Call Lacl Tblw LAR Call Call RETProgramming Algorithm, SPGM20.ASM PROTECT,DELAY,REGS,ARRAY AR3AR4 GpgmjSetc Intm Globally Mask ALL Interrupts Splk #0,ERROR Gpgmj SplkMask ALL Interrupts SUB Sacl BASE4Rowdone Lacl Fladrs Bcnd DONE, GTLacl Fladrs Newrow Adjrow NEGShut Down Write Operation Tblw SPAD1 Execute Command LAR SETRDVER0 Call Regs Access Flash RegistersPbend RET XOR FldataBcnd PBEND,EQ Subroutines Used By All Four Algorithms, SUTILS20.ASM OUT SPAD2,FACCESS0 SPAD2,FACCESS1OUT SPAD2,F24XACCS Lacc Flst SUBCallable Interface to Flash Algorithms Gclr SEGST,SEGEND,PROTECTPARMS+1 PARMS+2Lacl Error ErsparamsArstack ArprotectSacl Erscount Call FlwsLAR AR1,SVAR1 1PROTECTPopd *+ Call GpgmjSample Assembly Code to Erase and Reprogram the TMS320F206 Assembly Code for TMS320F206PARMS+1 SUB Memory Block B2 SectionsPsaram DLY PsaramSample C Code to Erase and Reprogram the TMS320F206 Linker Command File for TMS320F206 Sample C Code FLASH0 FLASH1BLKB2 Block B2 DsaramSample Assembly Code to Erase and Reprogram the TMS320F240 Assembly Code for TMS320F240Rticr WdcrCKCR0 CKCR1LDP #DPPF1 PORRST, PLLRST, Illrst SWRST, Wdrst Lacl Syssr Accl = SyssrSacl Syssr LDP #PARMS SplkDaram LDP #PARMS B0PGM Linker Command File for TMS320F240 Sample Assembly CodeExtram Extram 0 /******Delay Subroutine Rev1.003/98 JGC Linker Command File for TMS320F240 Sample C Code Block B2 Dsram B0DATLacl Wdcr Function for Disabling TMS320F240 Watchdog TimerCompute Length Functions for Initializing the TMS320F240 Sacl WdcrPshd SyscrSacl Wdtcr Index Assembly code SERA2x.ASM Described 10 to Margin Role in single program pulse WRITE/ERASE field Described
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