网站建设十年杜绝模板,wordpress 蛋彩画主题,怎么制作网站二维码,郑州企业网站优化多少钱Linux驱动操作地址(寄存器#xff09;的一些方式 文章目录Linux驱动操作地址(寄存器#xff09;的一些方式1.对绝对地址赋值操作2. ioremap2.1 void __iomem *地址2.2 volatile unsigned int *地址2.3 structioremap1.对绝对地址赋值操作
对绝对地址0x100000赋值操作
*的一些方式 文章目录Linux驱动操作地址(寄存器的一些方式1.对绝对地址赋值操作2. ioremap2.1 void __iomem *地址2.2 volatile unsigned int *地址2.3 structioremap1.对绝对地址赋值操作
对绝对地址0x100000赋值操作
*unsigned int *0x1000001234;让程序跳转到绝对地址是0x100000去执行
*((void (*) () )0x100000) ();首先要将0x100000强制转换维函数指针即
(void (*) () )0x100000然后再调用它
*((void (*) () )0x100000) ();使用typedef可以更直观
typedef void(*) () voidFuncPtr;
*((voidFuncPtr)0x100000) ();2. ioremap
2.1 void __iomem *地址
/* 寄存器物理地址 */
#define CCM_CCGR1_BASE (0X020C406C)
#define SW_MUX_GPIO1_IO03_BASE (0X020E0068)
#define SW_PAD_GPIO1_IO03_BASE (0X020E02F4)
#define GPIO1_DR_BASE (0X0209C000)
#define GPIO1_GDIR_BASE (0X0209C004)/* 映射后的寄存器虚拟地址指针 */
static void __iomem *IMX6U_CCM_CCGR1;
static void __iomem *SW_MUX_GPIO1_IO03;
static void __iomem *SW_PAD_GPIO1_IO03;
static void __iomem *GPIO1_DR;
static void __iomem *GPIO1_GDIR;/* 寄存器地址映射 */IMX6U_CCM_CCGR1 ioremap(CCM_CCGR1_BASE, 4);SW_MUX_GPIO1_IO03 ioremap(SW_MUX_GPIO1_IO03_BASE, 4);SW_PAD_GPIO1_IO03 ioremap(SW_PAD_GPIO1_IO03_BASE, 4);GPIO1_DR ioremap(GPIO1_DR_BASE, 4);GPIO1_GDIR ioremap(GPIO1_GDIR_BASE, 4);int retvalue 0;u32 val 0;/*、使能GPIO1时钟 */val readl(IMX6U_CCM_CCGR1);val ~(3 26); /* 清楚以前的设置 */val | (3 26); /* 设置新值 */writel(val, IMX6U_CCM_CCGR1);/*设置GPIO1_IO03的复用功能将其复用为* GPIO1_IO03最后设置IO属性。*/writel(5, SW_MUX_GPIO1_IO03);/*寄存器SW_PAD_GPIO1_IO03设置IO属性*bit 16:0 HYS关闭*bit [15:14]: 00 默认下拉*bit [13]: 0 kepper功能*bit [12]: 1 pull/keeper使能*bit [11]: 0 关闭开路输出*bit [7:6]: 10 速度100Mhz*bit [5:3]: 110 R0/6驱动能力*bit [0]: 0 低转换率*/writel(0x10B0, SW_PAD_GPIO1_IO03);/* 设置GPIO1_IO03为输出功能 */val readl(GPIO1_GDIR);val ~(1 3); /* 清除以前的设置 */val | (1 3); /* 设置为输出 */writel(val, GPIO1_GDIR);/* 默认关闭LED */val readl(GPIO1_DR);val | (1 3); writel(val, GPIO1_DR);2.2 volatile unsigned int *地址
static volatile unsigned int *CCM_CCGR1 ;
static volatile unsigned int *IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03;
static volatile unsigned int *GPIO1_GDIR ;
static volatile unsigned int *GPIO1_DR ;CCM_CCGR1 ioremap(0x20C406C, 4);
IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 ioremap(0x20E0068, 4);
GPIO1_GDIR ioremap(0x0209C000 0x4, 4);
GPIO1_DR ioremap(0x0209C000 0, 4);/* GPIO1_IO03 */
/* a. 使能GPIO1* set CCM to enable GPIO1* CCM_CCGR1[CG13] 0x20C406C* bit[27:26] 0b11*/
*CCM_CCGR1 | (326);/* b. 设置GPIO1_IO03用于GPIO* set IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03* to configure GPIO1_IO03 as GPIO* IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 0x20E0068* bit[3:0] 0b0101 alt5*/
val *IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03;
val ~(0xf);
val | (5);
*IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 val;/* c. 设置GPIO1_IO03作为output引脚* set GPIO1_GDIR to configure GPIO1_IO03 as output* GPIO1_GDIR 0x0209C000 0x4* bit[3] 0b1*/
*GPIO1_GDIR | (13);2.3 structioremap
struct iomux {volatile unsigned int unnames[23];volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO00; /* offset 0x5c */volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO01;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO02;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO04;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO05;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO06;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO07;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO08;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO09;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_UART1_TX_DATA;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_UART1_RX_DATA;volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_UART1_CTS_B;
};struct imx6ull_gpio {volatile unsigned int dr;volatile unsigned int gdir;volatile unsigned int psr;volatile unsigned int icr1;volatile unsigned int icr2;volatile unsigned int imr;volatile unsigned int isr;volatile unsigned int edge_sel;
};/* enable GPIO4 */
static volatile unsigned int *CCM_CCGR3; /* enable GPIO5 */
static volatile unsigned int *CCM_CCGR1; /* set GPIO5_IO03 as GPIO */
static volatile unsigned int *IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER1;/* set GPIO4_IO14 as GPIO */
static volatile unsigned int *IOMUXC_SW_MUX_CTL_PAD_NAND_CE1_B;static struct iomux *iomux;static struct imx6ull_gpio *gpio4;
static struct imx6ull_gpio *gpio5;CCM_CCGR1 ioremap(0x20C406C, 4);
CCM_CCGR3 ioremap(0x20C4074, 4);
IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER1 ioremap(0x229000C, 4);
IOMUXC_SW_MUX_CTL_PAD_NAND_CE1_B ioremap(0x20E01B0, 4);iomux ioremap(0x20e0000, sizeof(struct iomux));
gpio4 ioremap(0x020A8000, sizeof(struct imx6ull_gpio));
gpio5 ioremap(0x20AC000, sizeof(struct imx6ull_gpio));if (which 0){/* 1. enable GPIO5 * CG15, b[31:30] 0b11*/*CCM_CCGR1 | (330);/* 2. set GPIO5_IO03 as GPIO * MUX_MODE, b[3:0] 0b101*/*IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 5;/* 3. set GPIO5_IO03 as output * GPIO5 GDIR, b[3] 0b1*/gpio5-gdir | (13);}else if(which 1){/* 1. enable GPIO1 * CG13, b[27:26] 0b11*/*CCM_CCGR1 | (326);/* 2. set GPIO1_IO03 as GPIO * MUX_MODE, b[3:0] 0b101*/iomux-IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 5;/* 3. set GPIO1_IO03 as output * GPIO1 GDIR, b[3] 0b1*/gpio1-gdir | (13);}else if(which 2){/* 1. enable GPIO1 * CG13, b[27:26] 0b11*/*CCM_CCGR1 | (326);/* 2. set GPIO1_IO05 as GPIO * MUX_MODE, b[3:0] 0b101*/iomux-IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO05 5;/* 3. set GPIO1_IO05 as output * GPIO1 GDIR, b[5] 0b1*/gpio1-gdir | (15);}else if(which 3){/* 1. enable GPIO1 * CG13, b[27:26] 0b11*/*CCM_CCGR1 | (326);/* 2. set GPIO1_IO06 as GPIO * MUX_MODE, b[3:0] 0b101*/iomux-IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO06 5;/* 3. set GPIO1_IO06 as output * GPIO1 GDIR, b[6] 0b1*/gpio1-gdir | (16);}if (which 0){/* 1. enable GPIO5 * CG15, b[31:30] 0b11*/*CCM_CCGR1 | (330);/* 2. set GPIO5_IO01 as GPIO * MUX_MODE, b[3:0] 0b101*/*IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER1 5;/* 3. set GPIO5_IO01 as input * GPIO5 GDIR, b[1] 0b0*/gpio5-gdir ~(11);}else if(which 1){/* 1. enable GPIO4 * CG6, b[13:12] 0b11*/*CCM_CCGR3 | (312);/* 2. set GPIO4_IO14 as GPIO * MUX_MODE, b[3:0] 0b101*/IOMUXC_SW_MUX_CTL_PAD_NAND_CE1_B 5;/* 3. set GPIO4_IO14 as input * GPIO4 GDIR, b[14] 0b0*/gpio4-gdir ~(114);}
