SPI驱动ICM-20608六轴传感器测试。
一、硬件电路部分
二、修改设备树文件
2.1、修改irv1126-pinctrl.dtsi文件
检查SPI和配置ICM-20608芯片的片选端口,GPIO0_A0。
2.2、修改irv1126-alientek.dtsi文件
在SPI0节点下增加ICM-20608节点
三、程序
3.1、icm20608reg.h
#ifndef __IMC20608REG_H
#define __IMC20608REG_H
/* ID值 */
#define ICM20608G_ID (0XAF)
#define ICM20608D_ID (0XAE)
/* 定义寄存器 */
/* ICM20608寄存器
*复位后所有寄存器地址都为0,除了
*Register 107(0X6B) Power Management 1 = 0x40
*Register 117(0X75) WHO_AM_I = 0xAF或0xAE
*/
/* 陀螺仪和加速度自测(出产时设置,用于与用户的自检输出值比较) */
#define ICM20_SELF_TEST_X_GYRO 0x00
#define ICM20_SELF_TEST_Y_GYRO 0x01
#define ICM20_SELF_TEST_Z_GYRO 0x02
#define ICM20_SELF_TEST_X_ACCEL 0x0D
#define ICM20_SELF_TEST_Y_ACCEL 0x0E
#define ICM20_SELF_TEST_Z_ACCEL 0x0F
/* 陀螺仪静态偏移 */
#define ICM20_XG_OFFS_USRH 0x13
#define ICM20_XG_OFFS_USRL 0x14
#define ICM20_YG_OFFS_USRH 0x15
#define ICM20_YG_OFFS_USRL 0x16
#define ICM20_ZG_OFFS_USRH 0x17
#define ICM20_ZG_OFFS_USRL 0x18
#define ICM20_SMPLRT_DIV 0x19
#define ICM20_CONFIG 0x1A
#define ICM20_GYRO_CONFIG 0x1B
#define ICM20_ACCEL_CONFIG 0x1C
#define ICM20_ACCEL_CONFIG2 0x1D
#define ICM20_LP_MODE_CFG 0x1E
#define ICM20_ACCEL_WOM_THR 0x1F
#define ICM20_FIFO_EN 0x23
#define ICM20_FSYNC_INT 0x36
#define ICM20_INT_PIN_CFG 0x37
#define ICM20_INT_ENABLE 0x38
#define ICM20_INT_STATUS 0x3A
/* 加速度输出 */
#define ICM20_ACCEL_XOUT_H 0x3B
#define ICM20_ACCEL_XOUT_L 0x3C
#define ICM20_ACCEL_YOUT_H 0x3D
#define ICM20_ACCEL_YOUT_L 0x3E
#define ICM20_ACCEL_ZOUT_H 0x3F
#define ICM20_ACCEL_ZOUT_L 0x40
/* 温度输出 */
#define ICM20_TEMP_OUT_H 0x41
#define ICM20_TEMP_OUT_L 0x42
/* 陀螺仪输出 */
#define ICM20_GYRO_XOUT_H 0x43
#define ICM20_GYRO_XOUT_L 0x44
#define ICM20_GYRO_YOUT_H 0x45
#define ICM20_GYRO_YOUT_L 0x46
#define ICM20_GYRO_ZOUT_H 0x47
#define ICM20_GYRO_ZOUT_L 0x48
#define ICM20_SIGNAL_PATH_RESET 0x68
#define ICM20_ACCEL_INTEL_CTRL 0x69
#define ICM20_USER_CTRL 0x6A
#define ICM20_PWR_MGMT_1 0x6B
#define ICM20_PWR_MGMT_2 0x6C
#define ICM20_FIFO_COUNTH 0x72
#define ICM20_FIFO_COUNTL 0x73
#define ICM20_FIFO_R_W 0x74
#define ICM20_WHO_AM_I 0x75
/* 加速度静态偏移 */
#define ICM20_XA_OFFSET_H 0x77
#define ICM20_XA_OFFSET_L 0x78
#define ICM20_YA_OFFSET_H 0x7A
#define ICM20_YA_OFFSET_L 0x7B
#define ICM20_ZA_OFFSET_H 0x7D
#define ICM20_ZA_OFFSET_L 0x7E
#endif
3.2、icm20608_drv.c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/atomic.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#include "icm20608reg.h"
#define ICM20608_CNT 1
#define ICM20608_NAME "icm20680"
/*设备结构体*/
struct icm20608_dev
{
dev_t devid; /* 设备号 */
int major; /* 主设备号 */
int minor; /* 次设备号 */
struct cdev cdev; /* cdev */
struct class *class; /* 类 */
struct device *device; /* 设备 */
void *private_data; /*私有数据 */
signed int gyro_x_adc; /* 陀螺仪X轴原始值 */
signed int gyro_y_adc; /* 陀螺仪Y轴原始值 */
signed int gyro_z_adc; /* 陀螺仪Z轴原始值 */
signed int accel_x_adc; /* 加速度计X轴原始值 */
signed int accel_y_adc; /* 加速度计Y轴原始值 */
signed int accel_z_adc; /* 加速度计Z轴原始值 */
signed int temp_adc; /* 温度原始值 */
};
struct icm20608_dev icm20608dev;
/*
* @description : 从 icm20608 读取多个寄存器数据
* @param – dev : icm20608 设备
* @param – reg : 要读取的寄存器首地址
* @param – val : 读取到的数据
* @param – len : 要读取的数据长度
* @return : 操作结果
*/
static int icm20608_read_regs(struct icm20608_dev *dev, u8 reg, void *buf, int len)
{
int ret = -1;
unsigned char txdata[1];
unsigned char * rxdata;
struct spi_message m;
struct spi_transfer *t;
struct spi_device *spi = (struct spi_device *)dev->private_data;
t = kzalloc(sizeof(struct spi_transfer), GFP_KERNEL); /* 申请内存 */
if(!t) {
return -ENOMEM;
}
rxdata = kzalloc(sizeof(char) * len, GFP_KERNEL); /* 申请内存 */
if(!rxdata) {
goto out1;
}
/* 一共发送len+1个字节的数据,第一个字节为
寄存器首地址,一共要读取len个字节长度的数据,*/
txdata[0] = reg | 0x80; /* 写数据的时候首寄存器地址bit8要置1 表示读*/
t->tx_buf = txdata; /* 要发送的数据 */
t->rx_buf = rxdata; /* 要读取的数据 */
t->len = len+1; /* t->len=发送的长度+读取的长度 */
spi_message_init(&m); /* 初始化spi_message */
spi_message_add_tail(t, &m);/* 将spi_transfer添加到spi_message队列 */
ret = spi_sync(spi, &m); /* 同步发送 */
if(ret) {
goto out2;
}
memcpy(buf , rxdata+1, len); /* 只需要读取的数据 */
out2:
kfree(rxdata); /* 释放内存 */
out1:
kfree(t); /* 释放内存 */
return ret;
}
/*
* @description : 向 icm20608 多个寄存器写入数据
* @param – dev : icm20608 设备
* @param – reg : 要写入的寄存器首地址
* @param – val : 要写入的数据缓冲区
* @param – len : 要写入的数据长度
* @return : 操作结果
* */
static s32 icm20608_write_regs(struct icm20608_dev *dev, u8 reg, u8 *buf, int len)
{
int ret = -1;
unsigned char *txdata;
struct spi_message m;
struct spi_transfer *t;
struct spi_device *spi = (struct spi_device *)dev->private_data;
t = kzalloc(sizeof(struct spi_transfer), GFP_KERNEL); /* 申请内存 */
if(!t) {
return -ENOMEM;
}
txdata = kzalloc(sizeof(char)+len, GFP_KERNEL);
if(!txdata) {
goto out1;
}
/* 一共发送len+1个字节的数据,第一个字节为
寄存器首地址,len为要写入的寄存器的集合,*/
*txdata = reg & ~0x80; /* 写数据的时候首寄存器地址bit8要清零 */
memcpy(txdata+1, buf, len); /* 把len个寄存器拷贝到txdata里,等待发送 */
t->tx_buf = txdata; /* 要发送的数据 */
t->len = len+1; /* t->len=发送的长度+读取的长度 */
spi_message_init(&m); /* 初始化spi_message */
spi_message_add_tail(t, &m);/* 将spi_transfer添加到spi_message队列 */
ret = spi_sync(spi, &m); /* 同步发送 */
if(ret) {
goto out2;
}
out2:
kfree(txdata); /* 释放内存 */
out1:
kfree(t); /* 释放内存 */
return ret;
}
/*
* @description : 读取icm20608指定寄存器值,读取一个寄存器
* @param - dev: icm20608设备
* @param - reg: 要读取的寄存器
* @return : 读取到的寄存器值
*/
static unsigned char icm20608_read_onereg(struct icm20608_dev *dev, u8 reg)
{
u8 data = 0;
icm20608_read_regs(dev, reg, &data, 1);
return data;
}
/*icm20608写一个寄存器*/
static void icm20608_write_onereg(struct icm20608_dev *dev, u8 reg, u8 value)
{
u8 buf = value;
icm20608_write_regs(dev, reg, &buf, 1);
}
/*
* @description : 读取ICM20608的数据,读取原始数据,包括三轴陀螺仪、
* : 三轴加速度计和内部温度。
* @param - dev : ICM20608设备
* @return : 无。
*/
void icm20608_readdata(struct icm20608_dev *dev)
{
unsigned char data[14] = {0};
icm20608_read_regs(dev, ICM20_ACCEL_XOUT_H, data, 14);
dev->accel_x_adc = (signed short)((data[0] << 8) | data[1]);
dev->accel_y_adc = (signed short)((data[2] << 8) | data[3]);
dev->accel_z_adc = (signed short)((data[4] << 8) | data[5]);
dev->temp_adc = (signed short)((data[6] << 8) | data[7]);
dev->gyro_x_adc = (signed short)((data[8] << 8) | data[9]);
dev->gyro_y_adc = (signed short)((data[10] << 8) | data[11]);
dev->gyro_z_adc = (signed short)((data[12] << 8) | data[13]);
}
/*
* @description : 打开设备
* @param - inode : 传递给驱动的inode
* @param - filp : 设备文件,file结构体有个叫做pr似有ate_data的成员变量
* 一般在open的时候将private_data似有向设备结构体。
* @return : 0 成功;其他 失败
*/
static int icm20608_open(struct inode *inode, struct file *filp)
{
filp->private_data = &icm20608dev;
return 0;
}
/*
* @description : 从设备读取数据
* @param - filp : 要打开的设备文件(文件描述符)
* @param - buf : 返回给用户空间的数据缓冲区
* @param - cnt : 要读取的数据长度
* @param - offt : 相对于文件首地址的偏移
* @return : 读取的字节数,如果为负值,表示读取失败
*/
static ssize_t icm20608_read(struct file *filp, char __user *buf, size_t cnt, loff_t *off)
{
signed int data[7];
long err = 0;
struct icm20608_dev *dev = (struct icm20608_dev *)filp->private_data;
icm20608_readdata(dev);
data[0] = dev->gyro_x_adc;
data[1] = dev->gyro_y_adc;
data[2] = dev->gyro_z_adc;
data[3] = dev->accel_x_adc;
data[4] = dev->accel_y_adc;
data[5] = dev->accel_z_adc;
data[6] = dev->temp_adc;
err = copy_to_user(buf, data, sizeof(data));
return 0;
}
static int icm20608_release(struct inode *inode, struct file *filp)
{
return 0;
}
/* icm20608操作函数 */
struct file_operations icm20608_fops = {
.owner = THIS_MODULE,
.open = icm20608_open,
.release = icm20608_release,
.read = icm20608_read,
};
/*
* ICM20608内部寄存器初始化函数
* @param : 无
* @return : 无
*/
void icm20608_reginit(void)
{
u8 value = 0;
icm20608_write_onereg(&icm20608dev, ICM20_PWR_MGMT_1, 0x80); /* 复位,复位后为0x40,睡眠模式 */
mdelay(50);
icm20608_write_onereg(&icm20608dev, ICM20_PWR_MGMT_1, 0x01); /* 关闭睡眠,自动选择时钟 */
mdelay(50);
value = icm20608_read_onereg(&icm20608dev, ICM20_WHO_AM_I);
printk("ICM20608 ID = %#X\r\n", value);
value = icm20608_read_onereg(&icm20608dev, ICM20_PWR_MGMT_1);
printk("ICM20_PWR_MGMT_1 = %#X\r\n", value);
icm20608_write_onereg(&icm20608dev, ICM20_SMPLRT_DIV, 0x00); /* 输出速率是内部采样率 */
icm20608_write_onereg(&icm20608dev, ICM20_GYRO_CONFIG, 0x18); /* 陀螺仪±2000dps量程 */
icm20608_write_onereg(&icm20608dev, ICM20_ACCEL_CONFIG, 0x18); /* 加速度计±16G量程 */
icm20608_write_onereg(&icm20608dev, ICM20_CONFIG, 0x04); /* 陀螺仪低通滤波BW=20Hz */
icm20608_write_onereg(&icm20608dev, ICM20_ACCEL_CONFIG2,0x04); /* 加速度计低通滤波BW=21.2Hz */
icm20608_write_onereg(&icm20608dev, ICM20_PWR_MGMT_2, 0x00); /* 打开加速度计和陀螺仪所有轴 */
icm20608_write_onereg(&icm20608dev, ICM20_LP_MODE_CFG, 0x00); /* 关闭低功耗 */
icm20608_write_onereg(&icm20608dev, ICM20_FIFO_EN, 0x00); /* 关闭FIFO */
}
static int icm20608_probe(struct spi_device *spi)
{
int ret = 0;
/* 1、构建设备号 */
icm20608dev.major = 0;
if (icm20608dev.major)
{
icm20608dev.devid = MKDEV(icm20608dev.major, 0);
ret = register_chrdev_region(icm20608dev.devid, ICM20608_CNT, ICM20608_NAME);
}
else
{
ret = alloc_chrdev_region(&icm20608dev.devid, 0, ICM20608_CNT, ICM20608_NAME);
icm20608dev.major = MAJOR(icm20608dev.devid);
icm20608dev.minor = MINOR(icm20608dev.devid);
}
if (ret < 0)
{
printk("icm20608 chrdev_region err!\r\n");
goto fail_devid;
}
printk("icm20608dev major = %d, minor = %d\r\n", icm20608dev.major, icm20608dev.minor);
/* 2、注册设备 */
icm20608dev.cdev.owner = THIS_MODULE;
cdev_init(&icm20608dev.cdev, &icm20608_fops);
ret = cdev_add(&icm20608dev.cdev, icm20608dev.devid, ICM20608_CNT);
if (ret < 0)
{
printk("icm20608 cdev_add err!\r\n");
goto fail_cdev;
}
/* 3、创建类 */
icm20608dev.class = class_create(THIS_MODULE, ICM20608_NAME);
if (IS_ERR(icm20608dev.class))
{
ret = PTR_ERR(icm20608dev.class);
printk("icm20608 chrdev_class err!\r\n");
goto fail_class;
}
/* 4、创建设备 */
icm20608dev.device = device_create(icm20608dev.class, NULL,
icm20608dev.devid, NULL, ICM20608_NAME);
if (IS_ERR(icm20608dev.device))
{
ret = PTR_ERR(icm20608dev.device);
printk("icm20608 chrdev_device err!\r\n");
goto fail_device;
}
/*初始化spi_device*/
spi->mode = SPI_MODE_0;
spi_setup(spi);
/*设置icm20608私有数据*/
icm20608dev.private_data = spi;
/*初始化icm20608*/
icm20608_reginit();
printk("icm20608_probe\r\n");
return 0;
fail_device:
class_destroy(icm20608dev.class);
fail_class:
cdev_del(&icm20608dev.cdev);
fail_cdev:
unregister_chrdev_region(icm20608dev.devid, ICM20608_CNT);
fail_devid:
return ret;
}
static int icm20608_remove(struct spi_device *spi)
{
/* 删除字符设备 */
cdev_del(&icm20608dev.cdev);
/*注销设备号*/
unregister_chrdev_region(icm20608dev.devid, ICM20608_CNT);
/*摧毁设备*/
device_destroy(icm20608dev.class, icm20608dev.devid);
/*摧毁类*/
class_destroy(icm20608dev.class);
printk("icm20608_remove\r\n");
return 0;
}
/*传统匹配*/
struct spi_device_id icm20608_id[] = {
{"invensense,icm20608", 0},
{}
};
/*设备树匹配*/
static const struct of_device_id icm20608_of_match[] = {
{.compatible = "invensense,icm20608"},
{}
};
/* SPI驱动结构体 */
static struct spi_driver icm20608_driver = {
.probe = icm20608_probe,
.remove = icm20608_remove,
.driver = {
.owner = THIS_MODULE,
.name = "icm20608",
.of_match_table = icm20608_of_match,
},
.id_table = icm20608_id,
};
/*驱动入口*/
static int __init icm20608_init(void)
{
return spi_register_driver(&icm20608_driver);
}
/*驱动出口*/
static void __exit icm20608_exit(void)
{
spi_unregister_driver(&icm20608_driver);
}
module_init(icm20608_init);
module_exit(icm20608_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("ALK");
3.3、icm20608_app.c
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/input.h>
int main(int argc, char *argv[])
{
int fd;
char *filename;
signed int databuf[7];
unsigned char data[14];
signed int gyro_x_adc, gyro_y_adc, gyro_z_adc;
signed int accel_x_adc, accel_y_adc, accel_z_adc;
signed int temp_adc;
float gyro_x_act, gyro_y_act, gyro_z_act;
float accel_x_act, accel_y_act, accel_z_act;
float temp_act;
int ret = 0;
/*判断命令行输入参数是否正确*/
if(argc != 2){
printf("error usage!\r\n");
return -1;
}
/*用指针指向文件*/
filename = argv[1];
/*打开文件*/
fd = open(filename , O_RDWR);
if(fd < 0){
printf("file open failed\r\n",filename);
return -1;
}
while(1)
{
ret = read(fd, databuf, sizeof(databuf));
if(ret == 0) { /* 数据读取成功 */
gyro_x_adc = databuf[0];
gyro_y_adc = databuf[1];
gyro_z_adc = databuf[2];
accel_x_adc = databuf[3];
accel_y_adc = databuf[4];
accel_z_adc = databuf[5];
temp_adc = databuf[6];
/* 计算实际值 */
gyro_x_act = (float)(gyro_x_adc) / 16.4;
gyro_y_act = (float)(gyro_y_adc) / 16.4;
gyro_z_act = (float)(gyro_z_adc) / 16.4;
accel_x_act = (float)(accel_x_adc) / 2048;
accel_y_act = (float)(accel_y_adc) / 2048;
accel_z_act = (float)(accel_z_adc) / 2048;
temp_act = ((float)(temp_adc) - 25 ) / 326.8 + 25;
printf("\r\n原始值:\r\n");
printf("gx = %d, gy = %d, gz = %d\r\n",
gyro_x_adc, gyro_y_adc, gyro_z_adc);
printf("ax = %d, ay = %d, az = %d\r\n",
accel_x_adc,accel_y_adc, accel_z_adc);
printf("temp = %d\r\n", temp_adc);
printf("实际值:");
printf("act gx = %.2f°/S, act gy = %.2f°/S, act gz = %.2f°/S\r\n",
gyro_x_act, gyro_y_act, gyro_z_act);
printf("act ax = %.2fg, act ay = %.2fg, act az = %.2fg\r\n",
accel_x_act, accel_y_act, accel_z_act);
printf("act temp = %.2f°C\r\n", temp_act);
}
usleep(200000); /*200ms */
}
/*关闭文件*/
close(fd);
return 0;
}
四、编译
4.1、编译驱动模块
root@ubuntu:/opt/atk-rv1126_app/icm20608-test# make ARCH=arm
4.2、编译应用程序
root@ubuntu:/opt/atk-rv1126_app/icm20608-test# /opt/atk-dlrv1126-toolchain/bin/arm-linux-gnueabihf-gcc icm20608_app.c -o icm20608_app
4.3、复制文件到开发板
root@ubuntu:/opt/atk-rv1126_app/icm20608-test# scp icm20608_drv.ko root@192.168.1.117:/lib/modules/4.19.111
root@ubuntu:/opt/atk-rv1126_app/icm20608-test# scp icm20608_app root@192.168.1.117:/lib/modules/4.19.111
五、运行
[root@ATK-DLRV1126:/lib/modules/4.19.111]# modprobe icm20608_drv.ko
终端输出测试的数据结果
[root@ATK-DLRV1126:/lib/modules/4.19.111]# ./icm20608_app /dev/icm20680
本帖最后由 TL-LED 于 2024-3-31 16:45 编辑