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https://github.com/LNH-team/pico-loader.git
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70 lines
1.2 KiB
ArmAsm
70 lines
1.2 KiB
ArmAsm
.cpu arm7tdmi
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.syntax unified
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.section "ak2_readsd", "ax"
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.thumb
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// r0 = src sector
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// r1 = dst
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// r2 = sector count
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.global ak2_readSd
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.type ak2_readSd, %function
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ak2_readSd:
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push {r4,lr}
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ldr r4, =0x040001A0
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movs r3, #0x80
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strb r3, [r4,#1]
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.global ak2_readSd_sdsc_shift
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ak2_readSd_sdsc_shift:
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lsls r4, r0, #9
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push {r0-r1}
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ldr r0, =0x120004D5
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movs r1, r4
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ldr r3, ak2_readSd_sendSdioCommand_address
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bl blx_r3
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// Wait for SD state
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movs r0, #4
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movs r1, #7
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ldr r3, ak2_readSd_sdWaitForState_address
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bl blx_r3
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pop {r0-r1}
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// Read sectors. Parameters identical to readSd
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ldr r3, ak2_readSd_sdReadSector_address
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bl blx_r3
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// Send CMD12 == STOP_TRANSMISSION
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push {r0-r1}
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ldr r0, =0x0C0001D5
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movs r1, #0
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ldr r3, ak2_readSd_sendSdioCommand_address
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bl blx_r3
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pop {r0-r1,r4,pc}
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blx_r3:
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bx r3
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.balign 4
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.global ak2_readSd_sendSdioCommand_address
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ak2_readSd_sendSdioCommand_address:
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.word 0
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.global ak2_readSd_sdReadSector_address
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ak2_readSd_sdReadSector_address:
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.word 0
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.global ak2_readSd_sdWaitForState_address
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ak2_readSd_sdWaitForState_address:
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.word 0
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.pool
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.end
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