2017-01-18 42 views
1

我试图旋转使用树莓PI 2的I2C接口用下面的代码电动机(RMCS-220X高扭矩编码器直流伺服电动机和驱动程序):wiringPi库旋转双向DC伺服马达

#include <stdio.h> 
#include <wiringPi.h> 
#include <wiringPiI2C.h> 
#define Motoraddrs 0x08 //motor address 

int main(void){ 
int I2C_fd; 

wiringPiSetupGpio(); 
wiringPiSetup(); 

I2C_fd = wiringPiI2CSetup(Motoraddrs); 

wiringPiI2CWriteReg16(I2C_fd, 0x01, 0xff);//spins from low speed of 0x01 to 
              max 0xff in right side 
delay(100); 

return 0; 
} 

在函数wiringPiI2CWriteReg16中写入的字节如下面的代码在电机的数据表中给出。

/*这里是关于RMCS-220X更新速度变量的一个例子使用转发255 */

I2C_Start(0x10 + 0); // send the slave address of the RMCS-220x and write 
         bit 0     
I2C_Write(1); // send the command variable for speed 
I2C_Write(255); // send LSB of 255 
I2C_Write(0); // send MSB of 0 to and so Speed of forward 255 
I2C_Stop(); // send I2C stop 

/*这里是关于RMCS-220X更新速度变量的一个例子使用扭转255并读*/

I2C_Start(0x10 + 0); // send the slave address of the RMCS-220x and 
         write bit 0 
I2C_Write(1); // send the command variable for speed 
I2C_Write(1); // send LSB of 1 
I2C_Write(255); // send MSB of 255 to and so Speed of backward 255 
I2C_Rep_Start(0x10 + 1); // send I2C address with rep start and 1 to read 
speed = I2C_Read_Ack(); // read speed LSB byte and ack 
speed = I2C_Read_Nak(); // read speed MSB byte and don’t ack 
I2C_Stop(); // send I2C stop 

在我的情况与如上所述使用wiringPi库,允许我仅在一个(右)方向上旋转马达的代码。现在,我想它在左方向旋转。

将非常感谢您的建议。

回答

0

您必须在最后2个字节的数据使用符号值:

要旋转向后:

... 

I2C_Write(1); // send the command variable for speed 

I2C_Write(1); // send LSB of 1 

I2C_Write(255);// send MSB of 255 to and so Speed of backward 255 

... 

向前旋转:

... 

I2C_Write(1);// send the command variable for speed 
I2C_Write(255);// send LSB of 255 
I2C_Write(0);// send MSB of 0 to and so Speed of forward 255 

...