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Programming flash on ST10F269

Elliot Chisholm

Can anyone point me in the direction of any information/code on programming on-chip Flash. I have application note 1496 but require more information than it offers.

Parents
  • 0

    When I run the following code instead of getting the flash status register on polling I am reading the value from the flash at the address I am trying to program. Has anybody else come accross this problem ?

    uint16_t ProgramWord( uint16_t segment, uint16_t segment_offset, uint16_t data )
{
	uint16_t rc = 255 ;

__asm{
		BCLR	IEN
		NOP
		NOP

		PUSH 	R5
		PUSH 	R6
		PUSH 	R7

		MOV		R5,#01554h		;load auxilary register R5 with command address
								;(used in command cycle 1)
		MOV		R6,#02AA8h		;load auxilary register R6 with command address
								;(used in command cycle 2)
		SCXT	DPP0,#08h		;push data page pointer 0 and load it to point
								;to segment 1
		MOV		R7,#0A8h		;load register R7 with 1st CI enable command
		MOV		[R5],R7			;command cycle 1
		MOV		R7,#054h		;load register R7 with 2nd CI enable command
		MOV		[R6],R7			;command cycle 2
		MOV		R7,#0A0h		;load register R7 with Program Word command
		MOV		[R6],R7			;command cycle 3
		POP		DPP0			;restore DPP0: following addressing to the Flash
								;will use EXTended instructions
								;R8 contains the segment to be programmed
								;R9 contains the segment offset address to be programmed
								;R10 contains the data to be programmed
		MOV		R8,#02h 		;segment
		MOV		R9,#0000h 		;segment_offset
		MOV		R10,#0000h 		;data

		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		[R9],R10		;command cycle 4: the E/P.C starts the execution of
								;Programming Command

		; Data-Polling after word programming :
	Data_Polling :
		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		R7,[R9]			;read Flash Status register (FSB) in R7
		MOV		debug12,R7
		MOV		R6,R7			;save it in R6 register
		XOR		R7,R10			;Check if FSB.7 = Data.7 (i.e. R7.7 = R10.7)
		JNB		R7.7,Prog_OK
								;Check if FSB.5 = 1 (Programming Error)
		JNB		R6.5,Data_Polling
		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		R7,[R9]			;read Flash Status register (FSB) in R7

		XOR		R7,R10			;Check if FSB.7 = Data.7 (i.e. R7.7 = R10.7)
		JNB		R7.7,Prog_OK
								;Programming failed: Flash remains in Write Operation.
								;To go back to normal Read operations, a Read/Reset
								;command must be performed
	Prog_Error :
 		MOV 	R7, #0F0h		;load register R7 with Read/Reset command
		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		[R9],R7
		MOV		rc,#00h

	Prog_OK :

		POP 	R5
		POP 	R6
		POP 	R7

		BSET	IEN
		NOP
		NOP
	 }

	 return rc ;
}

Reply
  • 0

    When I run the following code instead of getting the flash status register on polling I am reading the value from the flash at the address I am trying to program. Has anybody else come accross this problem ?

    uint16_t ProgramWord( uint16_t segment, uint16_t segment_offset, uint16_t data )
{
	uint16_t rc = 255 ;

__asm{
		BCLR	IEN
		NOP
		NOP

		PUSH 	R5
		PUSH 	R6
		PUSH 	R7

		MOV		R5,#01554h		;load auxilary register R5 with command address
								;(used in command cycle 1)
		MOV		R6,#02AA8h		;load auxilary register R6 with command address
								;(used in command cycle 2)
		SCXT	DPP0,#08h		;push data page pointer 0 and load it to point
								;to segment 1
		MOV		R7,#0A8h		;load register R7 with 1st CI enable command
		MOV		[R5],R7			;command cycle 1
		MOV		R7,#054h		;load register R7 with 2nd CI enable command
		MOV		[R6],R7			;command cycle 2
		MOV		R7,#0A0h		;load register R7 with Program Word command
		MOV		[R6],R7			;command cycle 3
		POP		DPP0			;restore DPP0: following addressing to the Flash
								;will use EXTended instructions
								;R8 contains the segment to be programmed
								;R9 contains the segment offset address to be programmed
								;R10 contains the data to be programmed
		MOV		R8,#02h 		;segment
		MOV		R9,#0000h 		;segment_offset
		MOV		R10,#0000h 		;data

		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		[R9],R10		;command cycle 4: the E/P.C starts the execution of
								;Programming Command

		; Data-Polling after word programming :
	Data_Polling :
		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		R7,[R9]			;read Flash Status register (FSB) in R7
		MOV		debug12,R7
		MOV		R6,R7			;save it in R6 register
		XOR		R7,R10			;Check if FSB.7 = Data.7 (i.e. R7.7 = R10.7)
		JNB		R7.7,Prog_OK
								;Check if FSB.5 = 1 (Programming Error)
		JNB		R6.5,Data_Polling
		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		R7,[R9]			;read Flash Status register (FSB) in R7

		XOR		R7,R10			;Check if FSB.7 = Data.7 (i.e. R7.7 = R10.7)
		JNB		R7.7,Prog_OK
								;Programming failed: Flash remains in Write Operation.
								;To go back to normal Read operations, a Read/Reset
								;command must be performed
	Prog_Error :
 		MOV 	R7, #0F0h		;load register R7 with Read/Reset command
		EXTS	R8,#1			;use EXTended addressing for next MOV instruction
		MOV		[R9],R7
		MOV		rc,#00h

	Prog_OK :

		POP 	R5
		POP 	R6
		POP 	R7

		BSET	IEN
		NOP
		NOP
	 }

	 return rc ;
}

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