Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Last revisionBoth sides next revision
doc:howto:mmc_over_gpio [2016/03/01 23:56] – [Configure GPIOs] valenttdocs:guide-user:hardware:mmc_over_gpio [2018/03/03 20:13] – ↷ Page moved from docs:user-guide:hardware:mmc_over_gpio to docs:guide-user:hardware:mmc_over_gpio bobafetthotmail
Line 1: Line 1:
 +====== MMC/SD card over GPIO howto ======
 +
 +This is a short guide to get an MMC/SD card working with OpenWrt Kamikaze 8.09 and an 2.6 Kernel. The driver can be configured using either UCI CLI or the LuCI WebUI.
 +
 +===== GPIO Pinouts =====
 +<code>
 +Description                GPIO
 +------------------------------------
 +PIN 1, CS - Chip Select    GPIO 7
 +PIN 2, DI - Data In        GPIO 1
 +PIN 3, VSS - Ground        GND
 +PIN 4, VDD - 3.3 Volts     3.3 Volts
 +PIN 5, CLK - Clock         GPIO 3
 +PIN 7, DO - Data Out       GPIO 4
 +</code>
 +
 +===== GPIO Solder Points =====
 +Images from PCB.
 +
 +===== Configuration using UCI CLI =====
 +
 +==== Install packages ====
 +
 +Required packages:
 +
 +  * kmod-mmc-over-gpio
 +  * kmod-fs-ext4/kmod-fs-vfat/.... (we use the EXT3 file system here)
 +  * cfdisk/fdisk (we use cfdisk here)
 +  * e2fsprogs (for formating SD card to EXT3)
 +
 +<code>
 +opkg update
 +opkg install kmod-mmc-over-gpio kmod-fs-ext4 cfdisk e2fsprogs kmod-nls-base kmod-nls-cp437 kmod-nls-iso8859-1
 +</code>
 +
 +Nice to have packages:
 +
 +  * blkid
 +
 +<code>
 +opkg install blkid
 +</code>
 +
 +==== Configure GPIOs ====
 +<code>
 +uci set mmc_over_gpio.@mmc_over_gpio[0].enabled=1
 +uci set mmc_over_gpio.@mmc_over_gpio[0].DI_pin=1
 +uci set mmc_over_gpio.@mmc_over_gpio[0].DO_pin=4
 +uci set mmc_over_gpio.@mmc_over_gpio[0].CLK_pin=3
 +uci set mmc_over_gpio.@mmc_over_gpio[0].CS_pin=7
 +uci commit mmc_over_gpio
 +/etc/init.d/mmc_over_gpio enable
 +/etc/init.d/mmc_over_gpio start
 +</code>
 +
 +If you ger an error saying "can't create /config/gpiommc/ directory" then first reboot the device.
 +
 +==== Mount the MMC/SD card via fstab ====
 +To get partition mounted automatically you have to edit and change START=20 to START=98 in the /etc/init.d/fstab init script.
 +<code>
 +uci add fstab mount
 +uci set fstab.@mount[0].enabled=1
 +uci set fstab.@mount[0].fstype=ext3
 +uci set fstab.@mount[0].device=/dev/mmcblk0p1
 +uci set fstab.@mount[0].target=/mnt/mmc
 +uci set fstab.@mount[0].options=rw,sync,noatime
 +uci commit fstab
 +/etc/init.d/fstab restart
 +</code>
 +
 +===== Tags =====
 +[[meta:tags|How to add tags]]
 +
 +{{tag>gpio}}
  
  • Last modified: 2019/08/26 16:34
  • by vgaetera