vs开发网站开发教程,重庆网站推广产品企业,wordpress怎么开启会员下载,珠海网站艰涩和内核版本#xff1a;Linux-3.0.35i.MX6Q GPIO复用修改方法#xff0c;验证平台为飞凌嵌入式OKMX6Q-S2开发板#xff0c;基于ARM Corte-A9 架构#xff0c;i.MX6Q四核处理器#xff0c;其它平台可参考使用。本次修改将原SD卡功能占用的部分引脚释放#xff0c;复用为GPIO。…内核版本Linux-3.0.35i.MX6Q GPIO复用修改方法验证平台为飞凌嵌入式OKMX6Q-S2开发板基于ARM Corte-A9 架构i.MX6Q四核处理器其它平台可参考使用。本次修改将原SD卡功能占用的部分引脚释放复用为GPIO。具体的GPIO号需要参考i.MX6 CPU手册(IMX6DQRM.pdf)的第四章Chapter 4 External Signals and Pin Multiplexing。i.MX6 CPU手册路径飞凌嵌入式OKMX6Q-S2、OKMX6DL-S2用户资料(A)/硬件/Datasheet/i.MX6/IMX6DQRM.pdf1、修改流程修改文件arch/arm/mach-mx6/board-mx6q_sabresd.h在其中增加如下定义/*GPIO*/MX6Q_PAD_SD3_CLK__GPIO_7_3,MX6Q_PAD_SD3_CMD__GPIO_7_2,MX6Q_PAD_SD3_DAT2__GPIO_7_6,MX6Q_PAD_SD3_DAT3__GPIO_7_7,MX6Q_PAD_SD3_DAT4__GPIO_7_1,MX6Q_PAD_SD3_DAT5__GPIO_7_0,MX6Q_PAD_SD3_DAT6__GPIO_6_18,MX6Q_PAD_SD3_DAT7__GPIO_6_17,MX6Q_PAD_NANDF_D1__GPIO_2_1,MX6Q_PAD_NANDF_D0__GPIO_2_0,将原来的SD卡的功能注释掉/* USDHC3 *//* MX6Q_PAD_SD3_CLK__USDHC3_CLK_50MHZ,MX6Q_PAD_SD3_CMD__USDHC3_CMD_50MHZ,MX6Q_PAD_SD3_DAT0__USDHC3_DAT0_50MHZ,MX6Q_PAD_SD3_DAT1__USDHC3_DAT1_50MHZ,MX6Q_PAD_SD3_DAT2__USDHC3_DAT2_50MHZ,MX6Q_PAD_SD3_DAT3__USDHC3_DAT3_50MHZ,MX6Q_PAD_SD3_DAT4__USDHC3_DAT4_50MHZ,MX6Q_PAD_SD3_DAT5__USDHC3_DAT5_50MHZ,MX6Q_PAD_SD3_DAT6__USDHC3_DAT6_50MHZ,MX6Q_PAD_SD3_DAT7__USDHC3_DAT7_50MHZ,MX6Q_PAD_NANDF_D0__GPIO_2_0,MX6Q_PAD_NANDF_D1__GPIO_2_1, */注Linux-3.0.35版本的内核将引脚功能定义在arch/arm/plat-mxc/include/mach/iomux-mx6q.h文件中其中对每个引脚的全部复用功能进行了定义有兴趣可以看一下。2、测试GPIO球号定义 GPIO号89 MX6Q_PAD_SD3_CLK__GPIO_7_3 19591 MX6Q_PAD_SD3_CMD__GPIO_7_2 19494 MX6Q_PAD_SD3_DAT2__GPIO_7_6 19893 MX6Q_PAD_SD3_DAT3__GPIO_7_7 19992 MX6Q_PAD_SD3_DAT4__GPIO_7_1 19390 MX6Q_PAD_SD3_DAT5__GPIO_7_0 19288 MX6Q_PAD_SD3_DAT6__GPIO_6_18 17887 MX6Q_PAD_SD3_DAT7__GPIO_6_17 17783 MX6Q_PAD_NANDF_D1__GPIO_2_1 3384 MX6Q_PAD_NANDF_D0__GPIO_2_0 32GPIO_M_N到GPIOX的算法GPIOX(M-1)*32N例如 GPIO_4_28(4-1)*3228124测试命令echo 33 /sys/class/gpio/exportecho out /sys/class/gpio/gpio33/directionecho 1 /sys/class/gpio/gpio33/valuecat /sys/class/gpio/gpio33/value
