Linux i2c怎么读写芯片16位寄存器
时间: 2024-02-18 16:59:42 浏览: 332
要使用Linux i2c读写芯片的16位寄存器,可以按照以下步骤操作:
1. 打开i2c设备文件,例如/dev/i2c-1。
2. 设置要访问的芯片的地址,使用i2c_smbus_write_byte函数向设备写入地址。
3. 使用i2c_smbus_read_word_data函数读取芯片的16位寄存器值,或使用i2c_smbus_write_word_data函数向芯片的16位寄存器写入数据。
下面是一个简单的例子,展示了如何读取芯片的16位寄存器值:
```
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <fcntl.h>
int main() {
int file;
char *filename = "/dev/i2c-1";
int addr = 0x50; // 芯片地址
int reg = 0x00; // 要读取的寄存器地址
int data;
// 打开i2c设备文件
if ((file = open(filename, O_RDWR)) < 0) {
printf("Failed to open i2c device\n");
return -1;
}
// 设置要访问的芯片地址
if (ioctl(file, I2C_SLAVE, addr) < 0) {
printf("Failed to set i2c address\n");
return -1;
}
// 读取寄存器值
data = i2c_smbus_read_word_data(file, reg);
printf("Register value: 0x%x\n", data);
close(file);
return 0;
}
```
如果要向芯片的16位寄存器写入数据,可以使用i2c_smbus_write_word_data函数,例如:
```
i2c_smbus_write_word_data(file, reg, data);
```
其中,data是要写入的16位数据。
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