AS5050 / AS5055 磁旋转编码器 通过 SPI 读取数据代码

又找到一个 ams 芯片的资料~~这么翻译下去，coco的英文水平要飚升了~~
这位楼主分享了自己的代码，表示自己是编程渣，希望有人可以帮助他 编程……

一楼提供的资料是那位楼主自己编写的程序（不知道是否有错），2楼的程序是一位热心网友提供的~（应该没错~~）

Hey people!

I'm trying to connect a AS5050 / AS5055 Magnetic Rotary Encoder to my arduino mega but I must admit I'm not a programming guy!
So I was wondering if someone could give me some help writing the code...?

This is the code in C... does anyone has a "arduino" translation

1. /*!
   
2. *****************************************************************************
   
3. *  Reads out chip data via SPI interface
   
4. *
   
5. *  This function is used to read out cordic value from chips supporting SPI
   
6. *  interface.
   
7. *****************************************************************************
   
8. */
   
9. #define SPI_CMD_READ 0x8000     /*!< flag indicating read attempt when using SPI interface */
   
10. #define SPI_REG_DATA  0x7ffe    /*!< data register when using SPI */
    
11. #define SPI_REG_AGC   0x7ff0    /*!< agc register when using SPI */
    
12. #define SPI_REG_CLRERR 0x6700   /*!< clear error register when using SPI */
    
13. 
    
14. void spiReadData()
    
15. {
    
16.    u16 dat;   // 16-bit data buffer for SPI communication
    
17.    ushort angle, agcreg;
    
18.    ubyte agc;
    
19.    ushort value;
    
20.    bit alarmHi, alarmLo;
    
21. 
    
22.    /* Send READ AGC command. Received data is thrown away: this data comes from the precedent      
    
23. command (unknown)*/
    
24.    dat  = SPI_CMD_READ | SPI_REG_AGC;
    
25.    dat |= spiCalcEvenParity(dat);
    
26.    spiTransfer((u8*)&dat, sizeof(u16));
    
27. 
    
28.   /* Send READ ANGLE command. Received data is the AGC value, from the precedent command */
    
29.    dat  = SPI_CMD_READ | SPI_REG_DATA;
    
30.    dat |= spiCalcEvenParity(dat);
    
31.    spiTransfer((u8*)&dat, sizeof(u16));
    
32.    agcreg = dat;
    
33. 
    
34.    /* Send NOP command. Received data is the ANGLE value, from the precedent command */
    
35.    dat = 0x0000; // NOP command.
    
36.    spiTransfer((u8*)&dat, sizeof(u16));
    
37.    angle = dat >> 2;
    
38. 
    
39.    }
    
40. 
    
41. if (((dat >> 1) & 0x1) || ((agcreg >> 1) & 0x1))
    
42.    {
    
43.        /* error flag set - need to reset it */
    
44.        dat  = SPI_CMD_READ | SPI_REG_CLRERR;
    
45.        dat |= spiCalcEvenParity(dat);
    
46.        spiTransfer((u8*)&dat, sizeof(u16));
    
47.    }
    
48.    else
    
49.    {
    
50.        agc = (agcreg >> 2) & 0x3f;  // AGC value (0..63)
    
51.        value = (dat >> 2) & 0x3fff;  // Angle value (0..4095 for AS5055)
    
52.        angle = (value * 360) / 4095;  // Angle value in degree (0..359.9°)
    
53.        alarmLo = (dat >> 14) & 0x1;
    
54.        alarmHi = (dat >> 15) & 0x1;
    
55.    }
    
56. }
    
57. 
    
58. /*!
    
59. *****************************************************************************
    
60. *  Calculate even parity of a 16 bit unsigned integer
    
61. *
    
62. *  This function is used by the SPI interface to calculate the even parity
    
63. *  of the data which will be sent via SPI to the encoder.
    
64. *
    
65. *  \param[in] value : 16 bit unsigned integer whose parity shall be calculated
    
66. *
    
67. *  \return : Even parity
    
68. *
    
69. *****************************************************************************
    
70. */
    
71. static u8 spiCalcEvenParity(ushort value)
    
72. {
    
73.    u8 cnt = 0;
    
74.    u8 i;
    
75. 
    
76.   for (i = 0; i < 16; i++)
    
77.    {
    
78.        if (value & 0x1)
    
79.        {
    
80.            cnt++;
    
81.        }
    
82.        value >>= 1;
    
83.    }
    
84.    return cnt & 0x1;
    
85. }
    

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然后有位网友给楼主提供了一份通过SPI读取数据的程序~真是可爱善良的小伙伴~

Here is a code for AS5055
This program reads data by SPI

1. //AS5055 READ DATA PROGRAM
   
2. //www.AleyRobotics.com, 2013
   
3. //Email: info@AleyRobotics.com
   
4. 
   
5. #include "SPI.h"
   
6.   unsigned int result = 0;
   
7.   unsigned int result1 = 0;
   
8.   unsigned int result2 = 0;
   
9. 
   
10. void setup ()
    
11. {
    
12. Serial.begin(9600);
    
13. SPI.begin();
    
14. SPI.setBitOrder(MSBFIRST);
    
15. SPI.setClockDivider(SPI_CLOCK_DIV64); //you can chose faster SPI frequency
    
16. }
    
17. 
    
18. void loop () {
    
19.   digitalWrite(SS, LOW);
    
20.   result1 = SPI.transfer(0xff);
    
21.   result2 = SPI.transfer(0xff);  
    
22.   digitalWrite(SS, HIGH);
    
23.   result1 &= 0b00111111;
    
24.   result1 = result1 << 8;
    
25.   result = (result1 | result2) >> 1;
    
26.   Serial.print("Result: ");
    
27.   Serial.print(" = ");
    
28.   Serial.println(result, DEC);
    
29.   delay(100);
    
30. }

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另外这位网友还提供了AS5048的SPI程序，我将会在另一个帖子中分享~

Lumhao

英语水平

gaon2

很赞，这就是技术渣的情操