mirror of
https://github.com/LNH-team/pico-loader.git
synced 2026-06-02 17:26:48 +02:00
74 lines
1.4 KiB
ArmAsm
74 lines
1.4 KiB
ArmAsm
.cpu arm7tdmi
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.syntax unified
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.thumb
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.section "dstt_sdstoptransmission", "ax"
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.global dstt_sdStopTransmission
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.type dstt_sdStopTransmission, %function
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dstt_sdStopTransmission:
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// send SD_CMD12_STOP_TRANSMISSION
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push {r3-r6,lr}
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ldr r3, =0xA7180000
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ldr r4, =0x040001A0
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// select rom mode, without irq
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// the caller may not have ensured this is set
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movs r6, #0x80
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strb r6, [r4,#1]
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// set sd host mode DSTT_MODE_SDCMD_RESPONSE_32BIT, SD_CMD12_STOP_TRANSMISSION
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// 51 00 00 00 00 0C 01 00
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movs r5, #0x51
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str r5, [r4,#0x8]
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ldr r5,= 0x00010C00
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str r5, [r4,#0xC]
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str r3, [r4,#0x4]
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movs r6, #0x41
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lsls r6, r6, #20 // r6 = 0x04100000
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cmd51_1_wait_loop:
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ldrb r5, [r4,#6]
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lsrs r5, r5, #8
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bcc cmd51_1_wait_loop
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ldr r5, [r6, #0x10]
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// sd busy poll
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// 50 xx xx xx xx xx xx xx
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// xx bytes are leftover from previous command
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movs r5, #0x50
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strb r5, [r4,#0x8]
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cmd50_poll_loop:
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str r3, [r4,#4]
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cmd50_wait_loop:
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ldrb r5, [r4,#6]
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lsrs r5, r5, #8
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bcc cmd50_wait_loop
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ldr r5, [r6, #0x10]
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cmp r5, #0
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bne cmd50_poll_loop
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// read sd response
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// 52 xx xx xx xx xx xx xx
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// xx bytes are leftover from previous command
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movs r5, #0x52
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strb r5, [r4,#0x8]
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str r3, [r4,#4]
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cmd52_wait_loop:
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ldrb r5, [r4,#6]
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lsrs r5, r5, #8
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bcc cmd52_wait_loop
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ldr r5, [r6, #0x10]
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pop {r3-r6,pc}
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.balign 4
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.pool
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.end
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