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Led addresses

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550DEdit

* SD Card Led On 
ROM:FFFF5104                 LDR     R2, =0xC0220000
ROM:FFFF5108                 MOV     R1, #0x46       ; overwrite previous value
ROM:FFFF510C                 STR     R1, [R2,#0x134]
or
ROM:FF2DF540                 LDR   R0, =0xC0220134
ROM:FF2DF544                 LDR   R1, [R0]     ; previous value
ROM:FF2DF548                 ORR   R1, R1, #2   ;set bit#1
ROM:FF2DF54C                 STR   R1, [R0]     ;store updated value

* SD card Led off
ROM:FFFF537C                 LDR     R1, =0xC0220000
ROM:FFFF5380                 MOV     R0, #0x44      ;overwrite
ROM:FFFF5384                 STR     R0, [R1,#0x134]
or
ROM:FF2DF574                 LDR     R0, =0xC0220134
ROM:FF2DF578                 LDR     R1, [R0]
ROM:FF2DF57C                 BIC     R1, R1, #2  ;bit clear
ROM:FF2DF580                 STR     R1, [R0]

600DEdit

* SD Card Led On
ROM:FF34B710                 LDR   R0, =0xC0220134
ROM:FF34B714                 LDR   R1, [R0]
ROM:FF34B718                 ORR   R1, R1, #2
ROM:FF34B71C                 STR   R1, [R0]

* SD Card Led Off
ROM:FF34B744                 LDR     R0, =0xC0220134
ROM:FF34B748                 LDR     R1, [R0]
ROM:FF34B74C                 BIC     R1, R1, #2
ROM:FF34B750                 STR     R1, [R0]

1000DEdit

* Drive Led On 
ROM:FFCFCACC                 MOV     R3, 0xC02200E0
ROM:FFCFCAD8                 STR     R3, [R11,#unk_FFFFFFEC]
ROM:FFCFCADC                 LDR     R3, [R11,#unk_FFFFFFEC]
ROM:FFCFCAE0                 LDR     R2, [R11,#unk_FFFFFFEC]
ROM:FFCFCAE4                 LDR     R1, [R2]
ROM:FFCFCAE8                 ORR     R2, R1, #2
ROM:FFCFCAEC                 STR     R2, [R3]

* Drive Led Off 
ROM:FFCFCB38                 MOV     R3, 0xC02200E0
ROM:FFCFCB44                 STR     R3, [R11,#unk_FFFFFFEC]
ROM:FFCFCB48                 LDR     R3, [R11,#unk_FFFFFFEC]
ROM:FFCFCB4C                 LDR     R2, [R11,#unk_FFFFFFEC]
ROM:FFCFCB50                 LDR     R1, [R2]
ROM:FFCFCB54                 BIC     R2, R1, #2
ROM:FFCFCB58                 STR     R2, [R3]

See Coutts code :

#define LED_RED     0xC02200E0
#define LED_BLUE    0xC02200E8
...
       while (1)
        {
                *((volatile long*)LED_BLUE) = 0x46;
                SleepTask(500);
                *((volatile long*)LED_BLUE) = 0x44;
                SleepTask(500);
        }

550D, 60D, 600D, 500D, 1100DEdit

*(int*)0xC0220134 |= 2;   // card LED on
*(int*)0xC0220134 &= ~2;  // card LED off

5D2, 50D Edit

*(int*)0xC02200BC |= 2;   // card LED on
*(int*)0xC02200BC &= ~2;  // card LED off
call("EdLedOn")    // AJ: Blue LED on
call("EdLedOff")   // AJ: Blue LED off
call("EdLedBlink") // AJ: Blue LED Blink (don't call it too quickly)

7DEdit

              LDR     R6, =0xC0223000
              MOV     R0, #0x46      ; on
              STR     R0, [R6,#0x2C]

              MOV     R1, #0x44      ;off
              STR     R1, [R6,#0x2C]

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