底下是SD转接板的接线,其中多了WP与CD的接线,这两根是卡槽的功能,所以没有出现在SD Card上: 另外,MicroSD的接法也是类似,可以直接接线、使用转接板、或是使用SD转接卡。底下是一般MicroSD的pin脚: 接线之后,打开范例 “File” -> “Examples” -> “AmebaSdFatFs” -> “file_read_write”这个范例里,会...
焊好SD卡座之后:对应SD卡pin都接到MCU上了。卡座上另有CD引脚是检测卡插入的,卡插入后CD与GND连通。还有WP引脚是识别写保护开关用的,我没连它。 个人的DIY就是折腾,ST官方库已经有SDIO的函数了为何不用?重新发明轮子?我就喜欢这么干,不喜欢烦琐的一层层打包的库函数啊,直接写寄存器才好玩 先得知道这些信号都...
焊好SD卡座之后：对应SD卡pin都接到MCU上了。卡座上另有CD引脚是检测卡插⼊的，卡插⼊后CD与GND连通。还有WP引脚是识别写保护开关⽤的，我没连它。个⼈的DIY就是折腾，ST官⽅库已经有SDIO的函数了为何不⽤？重新发明轮⼦？我就喜欢这么⼲，不喜欢烦琐的⼀层层打包的库函数啊，直接写寄存器才...
am335x_mmc[1].pm_caps = MMC_PM_KEEP_POWER; am335x_mmc[1].gpio_cd = -EINVAL; am335x_mmc[1].gpio_wp = -EINVAL; am335x_mmc[1].ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34; /* 3V3 */ /* mmc will be initialized when mmc0_init is called */ printk("!!!mmc2_wifi_init!
Suspend Temporarily halting the transfer of data TBD To Be Determined (in the future) Tuple Data blocks in a linked list or chain format VDD + Power supply VSS Power supply ground W/O Write Only WP Write Protect 附录A(标准化的) A.1 SD和SPI命令清单表4和表5中说明SD卡和SDIO设备在SPI和...
/* eMMC */ pinctrl_usdhc3: usdhc3grp { fsl,pins = < MX8MN_IOMUXC_NAND_WE_B_USDHC3_CLK 0x190 MX8MN_IOMUXC_NAND_WP_B_USDHC3_CMD 0x1d0 MX8MN_IOMUXC_NAND_DATA04_USDHC3_DATA0 0x1d0 MX8MN_IOMUXC_NAND_DATA05_USDHC3_DATA1 0x1d0 MX8MN_IOMUXC_NAND_DATA06_USDHC3_DATA2 0x...
符合v4.1版本规格的MMC卡称为HS MMC(High Speed MMC),由于bus width变化,所以HS MMC卡的接口增加了6pins,变成13pins。 v4.1版本对市场上的MMC产品进行了明确的划分,定义了两种MMC卡类型:MMC plus和MMC mobile,只有符合相应规格的卡片才能使用MMC plus或MMC mobilelogo。
[1.736796] omap_hsmmc 47810000.mmc: lookup for GPIO cd failed [1.736813] omap_hsmmc 47810000.mmc: GPIO lookup for consumer wp [1.736824] omap_hsmmc 47810000.mmc: using device tree for GPIO lookup [1.736836] of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node ...
Command, Clock, CD, WP, Pwr Ctrl (MIO or EMIO) LED control, bus voltage (EMIO) Interrupt or polling driven AHB master-slave interface operating at the CPU_1x clock rate Master mode for DMA transfers (with 1 KB FIFO) Slave mode for register accesses ...
Command, Clock, CD, WP, Pwr Ctrl (MIO or EMIO) LED control, bus voltage (EMIO) Interrupt or polling driven AHB master-slave interface operating at the CPU_1x clock rate Master mode for DMA transfers (with 1 KB FIFO) Slave mode for register accesses ...