BYR Achieve · 镜像论坛

最近在做一个linux iic的开发驱动基本写好了（不知道对不对）能够挂载到系统中但是每次读/写寄存器的时间要消耗5秒钟好蛋疼 bmp180设备要读取多个寄存器很费时间我把我的代码贴在下面求大神耐心点帮忙看看哭瞎了。。。 linux板级信息已经注册了：在/arch/arm/mach-mini2440.c中 static struct i2c_board_info __initdata BMP180_board_info[] = { { .type = "BMP180", .addr = (0xEE>>1), }, }; i2c_register_board_info(0,BMP180_board_info,ARRAY_SIZE(BMP180_board_info)); 上程序： //********************************** // BMP180 气压传感器驱动程序 // linux平台 // by lixin // 2015年1月22 //********************************** #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/mutex.h> #include <linux/fs.h> #include <asm/uaccess.h> #include <linux/miscdevice.h> #include <linux/delay.h> #include <asm/irq.h> #include <mach/regs-gpio.h> #include <mach/hardware.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/moduleparam.h> #include <linux/errno.h> #include <linux/ioctl.h> #include <linux/cdev.h> #include <linux/string.h> #include <linux/list.h> #include <linux/pci.h> #include <asm/atomic.h> #include <asm/unistd.h> #include <linux/device.h> #include <linux/delay.h> #define DEBUG 1 #ifdef DEBUG #define dbg(x...) printk(x) #else #define dbg(x...) (void)(0) #endif struct i2c_client *BMP180_client;// 定义一个客户端结构体 static int major; //主设备号 static struct class *cls;//设备类 #define BMP180_SLAVE_ADDRESS (0xEE>>1) //device address void *R_GPECON; void *R_GPEUP; static int __devexit BMP180_remove(struct i2c_client *client); static int __devinit BMP180_probe(struct i2c_client *client, const struct i2c_device_id *dev_id); static const struct i2c_device_id BMP180_id[] = { {"BMP180",0x77}, {} }; MODULE_DEVICE_TABLE(i2c, BMP180_id); static struct i2c_driver BMP180_driver = { //设备驱动结构体 .driver = { .name = "BMP180", .owner = THIS_MODULE, }, .id_table = BMP180_id, .probe = BMP180_probe, .remove = __devexit_p(BMP180_remove), }; static ssize_t BMP180_write(struct file *file, const char __user *buf, size_t size, loff_t *offset) { return -EIO; } static ssize_t BMP180_read(struct file *file, char __user *buf, size_t size, loff_t * offset) { unsigned char oss = 0x03;//严格模式在测量气压时有用 unsigned char reg_all = 0xF4; unsigned char call_t = 0x2E; unsigned char lsb_t = 0xF7;//温度的低8位 unsigned char msb_t = 0xF6;//温度的高8位 unsigned char call_p = 0x34+(oss<<6); unsigned char lsb_p = 0xF7; unsigned char msb_p = 0xF6; unsigned char xlsb_p = 0xF8; unsigned char data_t[2]; unsigned char address_t[2]; unsigned char data_p[3];//转换前的数据 unsigned char address_p[3]; unsigned char write_data[2]; long int test_kernel[2];//转换后的数据 struct i2c_msg msg[2]; printk("read---start"); //发出测量温度信号 /* 向设备中写数据配置第一个信号 */ write_data[0] = reg_all; write_data[1] = call_t; msg[0].addr = BMP180_client->addr; /* 设备地址*/ msg[0].buf = write_data; /* 设备寄存器地址+数据*/ msg[0].len = 2; /* 地址+数据=2 byte */ msg[0].flags = 0; /* 写*/ i2c_transfer(BMP180_client->adapter, msg, 1); mdelay(5); //测量结束发出读温度操作 //第一个发送要读取的寄存器地址写操作 //第二个要发送数据读取后存放的位置读操作 address_t[0] = msb_t; address_t[1] = lsb_t; msg[0].buf = address_t; msg[0].len = 2; msg[1].addr = BMP180_client->addr; /* 设备地址 */ msg[1].buf = data_t; /* 数据存放的地方*/ msg[1].len = 2; /* 读取两个数=1 byte */ msg[1].flags = I2C_M_RD; /* 读*/ i2c_transfer(BMP180_client->adapter, msg, 2); mdelay(1); /* msg[0].buf = &lsb_t; msg[1].buf = &data[0]; msg[1].flags = I2C_M_RD; i2c_transfer(BMP180_client->adapter, msg, 2); mdelay(1); msg[0].buf = &msb_t; msg[1].buf = &data[1]; i2c_transfer(BMP180_client->adapter, msg, 2); mdelay(1); */ //处理温度数据 test_kernel[0] = (long int)((data_t[0]<<8)|data_t[1]); //对传感器发送测量气压的命令 write_data[1] = call_p; msg[0].buf = write_data; msg[0].len = 2; msg[0].flags = 0;//转换为写模式 i2c_transfer(BMP180_client->adapter, msg, 1); mdelay(26);//延时26毫秒 //开始读取气压的数值 address_p[0] = msb_p; address_p[1] = lsb_p; address_p[2] = xlsb_p; msg[0].buf = address_p; msg[0].len = 3; msg[1].buf = data_p; msg[1].len = 3; i2c_transfer(BMP180_client->adapter, msg, 2); mdelay(1); test_kernel[1] = (long int)(((data_p[0]<<16)|(data_p[1]<<8)|data_p[2])>>(8-oss)); //到此为止测量结束 printk("read---end\n"); printk("%d,%d,%d,%d,%d\n",data_t[0],data_t[1],data_p[0],data_p[1],data_p[2]); printk("test_kernel[0] = %ld test_kernel = %ld",test_kernel[0],test_kernel[1]); copy_to_user(buf, test_kernel, 8);//将数据返回用户空间 return 0; } //open函数用来打开设备并且读取设备中的默认寄存器看看设备是否正常。 static int BMP180_open(struct inode *inode, struct file *file) { //设备打开失败返回1 打开成功返回0 unsigned long temp; short int temp_up; int err=0; int i = 0; unsigned char address[22];//22个寄存器的第一个寄存器的地址 unsigned char data[22];//8位数 struct i2c_msg msg[2]; temp = __raw_readl(R_GPECON); temp = (temp&0x0FFFFFFF)|0xA0000000; __raw_writel(temp,R_GPECON); temp_up = __raw_readl(R_GPEUP); printk("open---start"); address[0] = 0xAA; for(i=0;i<22;i++){ address[i]= address[0]+i; //先告诉系统要读那个寄存器 msg[0].addr = BMP180_client->addr; /* 设备地址*/ msg[0].buf = &address[i]; /* 设备寄存器地址*/ msg[0].len = 1; /* 地址=1 byte */ msg[0].flags = BMP180_client->flags & ( I2C_CLIENT_PEC);; /* 写*/ /* 配置第二个信号将寄存器里面的数据读出来*/ msg[1].addr = BMP180_client->addr; /* 设备地址 */ msg[1].buf = &data[i]; /* ?? */ msg[1].len = 1; /* 信号长度=1 byte */ msg[1].flags = BMP180_client->flags & ( I2C_CLIENT_PEC);; /* 读模式*/ msg[1].flags |= I2C_M_RD; i2c_transfer(BMP180_client->adapter, msg, 2); printk("read---end time"); mdelay(1); printk("time-end"); } for(i=0;i<22;i++){ // if(data[i]==0x00||data==0xFF){err=1;break;}//设备有问题或者读取有问题 printk(" %d ",data[i]); } return err; } static struct file_operations BMP180_fops = { .owner = THIS_MODULE, .read = BMP180_read, .write = BMP180_write, .open = BMP180_open, }; static int __devinit BMP180_probe(struct i2c_client *client, const struct i2c_device_id *dev_id)//用来构建一个client的结构体 { struct device *dev; if(dev_id) { printk("BMP180_DEVICE, dev_id.name (%s) /r/n",dev_id->name); } dbg("probe:name = %s,flag =%d,addr = %d,adapter = %d,driver = %s\n",client->name, client->flags,client->addr,client->adapter->nr,client->driver->driver.name ); R_GPECON = ioremap(0x56000040,0x4);//地址重映射 R_GPEUP = ioremap(0x56000048,0x2);//上拉控制寄存器重映射 BMP180_client = client; major = register_chrdev(0, "BMP180", &BMP180_fops);//向系统获得一个主设备号并且加载对文件操作的结构体。 cls = class_create(THIS_MODULE, "BMP180");//生成模块的class dev = device_create(cls,&client->dev, MKDEV(major, 0), NULL, "BMP180"); /* /dev/at24cxx *///创建文件夹 if (IS_ERR(dev)) { dbg("device create error\n"); } return 0; } static int __devexit BMP180_remove(struct i2c_client *client) { printk("BMP180_detach\n"); device_destroy(cls, MKDEV(major, 0));//撤销class 类 class_destroy(cls);//消除类 unregister_chrdev(major, "BMP180");//撤销主设备注册 // i2c_detach_client(client);//将客户端的client与adapter关联撤销 // kfree(i2c_get_clientdata(client));//释放client对应的内存 return 0; } static int __init BMP180_init(void) { i2c_add_driver(&BMP180_driver);//会调用attach函数进行相关的注册初始化 return 0; } static void __exit BMP180_exit(void) { i2c_del_driver(&BMP180_driver);//会调用BMP180_DETACH函数进行相关清理 } module_init(BMP180_init); module_exit(BMP180_exit); MODULE_LICENSE("GPL"); 求好心同学帮忙解决一下

[问题]linux bmp180湿度传感器iic驱动 求大神指点

[问题]linux bmp180湿度传感器iic驱动求大神指点