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AMSv2 SD: reorganise code to select 4-bit mode data transfer mode a bit and add comments

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29648 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2011-03-26 21:12:16 +00:00
parent 2543340bf4
commit 6512f0fb52
1 changed files with 6 additions and 5 deletions
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11
firmware/target/arm/as3525/sd-as3525v2.c
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@ -588,18 +588,19 @@ static int sd_init_card(const int drive)
if(drive == INTERNAL_AS3525) /* The OF is stored in the first blocks */
card_info[INTERNAL_AS3525].numblocks -= AMS_OF_SIZE;
#ifndef BOOTLOADER
/* Switch to to 4 bit widebus mode */
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_RESP, &response))
return -12;
#ifndef BOOTLOADER
/* Switch to to 4 bit widebus mode */
if(sd_wait_for_tran_state(drive) < 0)
return -13;
/* ACMD6 */
/* ACMD6: set bus width to 4-bit */
if(!send_cmd(drive, SD_SET_BUS_WIDTH, 2, MCI_ACMD|MCI_RESP, &response))
return -15;
/* ACMD42 */
/* ACMD42: disconnect the pull-up resistor on CD/DAT3 */
if(!send_cmd(drive, SD_SET_CLR_CARD_DETECT, 0, MCI_ACMD|MCI_RESP, &response))
return -17;