Hi all,
I'm working on the project to write a program download a program to flash memory through JTAG. The processor i'm using is Atmel AT91RM9200. Flash memory is AT49BV163D. For the start, I try to write the assembly code below to read the ID of the flash memory, but it doesn't seem to work. It doesn't give me the right manufacturer code and the device code. Could anybody give me some suggestion?
Thanks you.
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MOV R3, #1
MOV R0, R3, ROR #4 @flashbase = 0x10000000
MOV R1, #0xAA
MOV R2, #0x0A
ADD R1, R1, R2, LSL #8
MOV R2, R1, LSR #1
MOV R3, #0x90;
STRB R1, [R0, R2] @ write AAH to address flashbase+555H
STRB R2, [R0, R1] @ write 55H to address flashbase+AAAH
STRB R3, [R0, R2] @ write 90H to address flashbase+555H
@ Product ID mode is entered
MOV R3, #0
LDR R7, [R0, R3] @ read manufacturer code to R7
ADD R3, R3, #1
LDR R8, [R0, R3] @ read device code to R8
MOV R3, #0xF0
STRB R1, [R0, R2] @ write AAH to address flashbase+555H
STRB R2, [R0, R1] @ write 55H to address flashbase+AAAH
STRB R3, [R0, R2] @ write F0H to address flashbase+555H
@ Flash memory is back to normal mode