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2026-05-06T09:01:40Z
User contributions
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Flash access
2007-09-11T06:26:28Z
<p>84.56.189.170: Undo revision 252 by 84.61.183.35 (Talk)</p>
<hr />
<div>these are the original routines to erase a sector in flash, and to write data to it.<br />
<br />
first the sector erase routine, the adress is register R0<br />
<br />
<pre><br />
CS0:80001BBC eraseFlashSector ; DATA XREF: CS0:off_80000878 o<br />
CS0:80001BBC LDR R2, =0xAAA<br />
CS0:80001BC0 BIC R3, R0, #0xFF0<br />
CS0:80001BC4 BIC R3, R3, #0xF<br />
CS0:80001BC8 LDR R1, =0x554<br />
CS0:80001BCC MOV R12, #0xAA ; '¬'<br />
CS0:80001BD0 STRH R12, [R3,R2]<br />
CS0:80001BD4 MOV R12, #0x55 ; 'U'<br />
CS0:80001BD8 STRH R12, [R3,R1]<br />
CS0:80001BDC MOV R12, #0x80 ; 'Ç'<br />
CS0:80001BE0 STRH R12, [R3,R2]<br />
CS0:80001BE4 MOV R12, #0xAA ; '¬'<br />
CS0:80001BE8 STRH R12, [R3,R2]<br />
CS0:80001BEC MOV R2, #0x55 ; 'U'<br />
CS0:80001BF0 STRH R2, [R3,R1]<br />
CS0:80001BF4 MOV R3, #0x30 ; '0'<br />
CS0:80001BF8 STRH R3, [R0]<br />
CS0:80001BFC LDRH R2, [R0]<br />
CS0:80001C00 LDRH R3, [R0]<br />
CS0:80001C04 AND R2, R2, #0x44<br />
CS0:80001C08 AND R3, R3, #0x44<br />
CS0:80001C0C CMP R2, R3<br />
CS0:80001C10 LDREQ R3, =0x2040004<br />
CS0:80001C14 BEQ loc_80001C88<br />
CS0:80001C18<br />
CS0:80001C18 loc_80001C18 ; CODE XREF: eraseFlashSector+6C j<br />
CS0:80001C18 LDRH R3, [R0]<br />
CS0:80001C1C MOV R3, R3,LSR#3<br />
CS0:80001C20 EOR R3, R3, #1<br />
CS0:80001C24 ANDS R3, R3, #1<br />
CS0:80001C28 BNE loc_80001C18<br />
CS0:80001C2C MOV R1, R3<br />
CS0:80001C30<br />
CS0:80001C30 loc_80001C30 ; CODE XREF: eraseFlashSector+C4 j<br />
CS0:80001C30 LDRH R2, [R0]<br />
CS0:80001C34 LDRH R3, [R0]<br />
CS0:80001C38 AND R2, R2, #0x44<br />
CS0:80001C3C AND R3, R3, #0x44<br />
CS0:80001C40 CMP R2, R3<br />
CS0:80001C44 BEQ loc_80001C84<br />
CS0:80001C48 LDRH R3, [R0]<br />
CS0:80001C4C TST R3, #0x20<br />
CS0:80001C50 BEQ loc_80001C7C<br />
CS0:80001C54 LDRH R2, [R0]<br />
CS0:80001C58 LDRH R3, [R0]<br />
CS0:80001C5C AND R2, R2, #0x44<br />
CS0:80001C60 AND R3, R3, #0x44<br />
CS0:80001C64 CMP R2, R3<br />
CS0:80001C68 MOVNE R12, #0xF0 ; ''<br />
CS0:80001C6C LDRNE R3, =0x2040004<br />
CS0:80001C70 STRNEH R12, [R0]<br />
CS0:80001C74 BNE loc_80001C88<br />
CS0:80001C78 B loc_80001C84<br />
CS0:80001C7C ; ---------------------------------------------------------------------------<br />
CS0:80001C7C<br />
CS0:80001C7C loc_80001C7C ; CODE XREF: eraseFlashSector+94 j<br />
CS0:80001C7C CMP R1, #0<br />
CS0:80001C80 BEQ loc_80001C30<br />
CS0:80001C84<br />
CS0:80001C84 loc_80001C84 ; CODE XREF: eraseFlashSector+88 j<br />
CS0:80001C84 ; eraseFlashSector+BC j<br />
CS0:80001C84 MOV R3, #0<br />
CS0:80001C88<br />
CS0:80001C88 loc_80001C88 ; CODE XREF: eraseFlashSector+58 j<br />
CS0:80001C88 ; eraseFlashSector+B8 j<br />
CS0:80001C88 MOV R0, R3<br />
CS0:80001C8C RET<br />
CS0:80001C8C ; End of function eraseFlashSector<br />
</pre><br />
<br />
and here is the flash write function, again, register R0 to pass the destination adress, R1 <br />
is the source address of the data to be written, R2 the number of bytes or words to be written.<br />
<br />
<pre><br />
CS0:80001C9C programFlash ; DATA XREF: CS0:off_8000087C o<br />
CS0:80001C9C ; CS0:off_800009A0 o<br />
CS0:80001C9C STMFD SP!, {R4,R5,LR}<br />
CS0:80001CA0 MOV R12, R1<br />
CS0:80001CA4 SUBS LR, R2, #0<br />
CS0:80001CA8 MOV R5, #0<br />
CS0:80001CAC<br />
CS0:80001CAC loc_80001CAC ; CODE XREF: programFlash+8C j<br />
CS0:80001CAC BLE loc_80001D2C<br />
CS0:80001CB0 LDR R3, =0xAAA<br />
CS0:80001CB4 BIC R2, R0, #0xFF0<br />
CS0:80001CB8 BIC R2, R2, #0xF<br />
CS0:80001CBC MOV R1, #0xAA ; '¬'<br />
CS0:80001CC0 STRH R1, [R2,R3]<br />
CS0:80001CC4 LDR R1, =0x554<br />
CS0:80001CC8 MOV R4, #0x55 ; 'U'<br />
CS0:80001CCC STRH R4, [R2,R1]<br />
CS0:80001CD0 MOV R1, #0xA0 ; 'á'<br />
CS0:80001CD4 STRH R1, [R2,R3]<br />
CS0:80001CD8 LDRH R1, [R12]<br />
CS0:80001CDC MOV R4, #0<br />
CS0:80001CE0 STRH R1, [R0]<br />
CS0:80001CE4 AND R1, R1, #0x80<br />
CS0:80001CE8<br />
CS0:80001CE8 loc_80001CE8 ; CODE XREF: programFlash+78 j<br />
CS0:80001CE8 LDRH R2, [R0]<br />
CS0:80001CEC AND R3, R2, #0x80<br />
CS0:80001CF0 CMP R3, R1<br />
CS0:80001CF4 MOV R2, R2,LSL#16<br />
CS0:80001CF8 BEQ loc_80001D18<br />
CS0:80001CFC TST R2, #0x200000<br />
CS0:80001D00 LDRNE R5, =0x2040005<br />
CS0:80001D04 MOVNE R3, #0xF0 ; ''<br />
CS0:80001D08 STRNEH R3, [R0]<br />
CS0:80001D0C BNE loc_80001D18<br />
CS0:80001D10 CMP R4, #0<br />
CS0:80001D14 BEQ loc_80001CE8<br />
CS0:80001D18<br />
CS0:80001D18 loc_80001D18 ; CODE XREF: programFlash+5C j<br />
CS0:80001D18 ; programFlash+70 j<br />
CS0:80001D18 SUB LR, LR, #1<br />
CS0:80001D1C CMP LR, #0<br />
CS0:80001D20 ADD R0, R0, #2<br />
CS0:80001D24 ADD R12, R12, #2<br />
CS0:80001D28 B loc_80001CAC<br />
CS0:80001D2C ; ---------------------------------------------------------------------------<br />
CS0:80001D2C<br />
CS0:80001D2C loc_80001D2C ; CODE XREF: programFlash:loc_80001CAC j<br />
CS0:80001D2C MOV R0, R5<br />
CS0:80001D30 LDMFD SP!, {R4,R5,PC}<br />
CS0:80001D30 ; End of function programFlash<br />
</pre></div>
84.56.189.170