mirror of
https://github.com/LNH-team/pico-loader.git
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83 lines
1.3 KiB
ArmAsm
83 lines
1.3 KiB
ArmAsm
.cpu arm7tdmi
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.section "dstt_readsd", "ax"
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.syntax unified
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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 dstt_readSd
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.type dstt_readSd, %function
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dstt_readSd:
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push {r4-r7,lr}
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ldr r3, =0xA7180000
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ldr r4, =0x040001A0
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ldr r7, dstt_readSd_applySectorCommand_address
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bl blx_r7
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movs r7, #0x80
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strb r7, [r4,#1]
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movs r6, #0x41
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lsls r6, r6, #20
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sector_loop:
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str r3, [r4,#4]
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cmd54_wait_loop:
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ldrb r5, [r4,#6]
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lsrs r5, r5, #8
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bcc cmd54_wait_loop
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ldr r5, [r6, #0x10]
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ldr r7, dstt_waitDataReady_address
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bl blx_r7
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ldr r7, dstt_transferData_address
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bl blx_r7
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subs r2, #1
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beq stop_transmission
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// set sd host mode DSTT_MODE_RECEIVE_DATA_BLOCK_STOP_CLOCK
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// 51 00 00 00 00 00 07 00
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movs r5, #0x51
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str r5, [r4,#0x8]
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movs r5, #7
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lsls r5, r5, #16
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str r5, [r4,#0xC]
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b sector_loop
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stop_transmission:
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ldr r7, dstt_stopTransmission_address
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bl blx_r7
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pop {r4-r7,pc}
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blx_r7:
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bx r7
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.balign 4
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.global dstt_readSd_applySectorCommand_address
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dstt_readSd_applySectorCommand_address:
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.word 0
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.global dstt_waitDataReady_address
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dstt_waitDataReady_address:
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.word 0
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.global dstt_transferData_address
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dstt_transferData_address:
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.word 0
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.global dstt_stopTransmission_address
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dstt_stopTransmission_address:
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.word 0
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.pool
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.end
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