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AD7193驱动源程序

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ID:586906 发表于 2020-6-18 10:03 | 显示全部楼层 |阅读模式
  1. /******************************************************************************/
  2. #include "AD7193.h"                // AD7193 definitions.

  4. /******************************************************************************/
  5. /************************ Variables Definitions *******************************/
  6. /******************************************************************************/
  7. unsigned char currentPolarity = 0;
  8. unsigned char currentGain     = 1;

  10. /******************************************************************************/
  11. /************************ Functions Definitions *******************************/
  12. /******************************************************************************/

  14. /***************************************************************************//**
  15. * @brief Checks if the AD7139 part is present.
  16. *
  17. * @return status - Indicates if the part is present or not.
  18. *******************************************************************************/
  19. unsigned char AD7193_Init(void)
  20. {
  21.     unsigned char status = 1;
  22.     unsigned char regVal = 0;
  23.    
  24.     status = SPI_Init(0, 1000000, 1, 0);
  25.     regVal = AD7193_GetRegisterValue(AD7193_REG_ID, 1, 1);
  26.     if((regVal & AD7193_ID_MASK) != ID_AD7193)
  27.     {
  28.         status = 0;
  29.     }
  30.     return status;
  31. }

  33. /***************************************************************************//**
  34. * @brief Writes data into a register.
  35. *
  36. * @param registerAddress - Address of the register.
  37. * @param registerValue - Data value to write.
  38. * @param bytesNumber - Number of bytes to be written.
  39. * @param modifyCS - Allows Chip Select to be modified.
  40. *
  41. * @return none.
  42. *******************************************************************************/
  43. void AD7193_SetRegisterValue(unsigned char registerAddress,
  44.                              unsigned long registerValue,
  45.                              unsigned char bytesNumber,
  46.                              unsigned char modifyCS)
  47. {
  48.     unsigned char writeCommand[5] = {0, 0, 0, 0, 0};
  49.     unsigned char* dataPointer    = (unsigned char*)®isterValue;
  50.     unsigned char bytesNr         = bytesNumber;
  51.    
  52.     writeCommand[0] = AD7193_COMM_WRITE |
  53.                       AD7193_COMM_ADDR(registerAddress);
  54.     while(bytesNr > 0)
  55.     {
  56.         writeCommand[bytesNr] = *dataPointer;
  57.         dataPointer ++;
  58.         bytesNr --;
  59.     }
  60.     SPI_Write(AD7193_SLAVE_ID * modifyCS, writeCommand, bytesNumber + 1);
  61. }

  63. /***************************************************************************//**
  64. * @brief Reads the value of a register.
  65. *
  66. * @param registerAddress - Address of the register.
  67. * @param bytesNumber - Number of bytes that will be read.
  68. * @param modifyCS    - Allows Chip Select to be modified.
  69. *
  70. * @return buffer - Value of the register.
  71. *******************************************************************************/
  72. unsigned long AD7193_GetRegisterValue(unsigned char registerAddress,
  73.                                       unsigned char bytesNumber,
  74.                                       unsigned char modifyCS)
  75. {
  76.     unsigned char registerWord[5] = {0, 0, 0, 0, 0};
  77.     unsigned long buffer          = 0x0;
  78.     unsigned char i               = 0;
  79.    
  80.     registerWord[0] = AD7193_COMM_READ |
  81.                       AD7193_COMM_ADDR(registerAddress);
  82.     SPI_Read(AD7193_SLAVE_ID * modifyCS, registerWord, bytesNumber + 1);
  83.     for(i = 1; i < bytesNumber + 1; i++)
  84.     {
  85.         buffer = (buffer << 8) + registerWord[i];
  86.     }
  87.    
  88.     return buffer;
  89. }

  91. /***************************************************************************//**
  92. * @brief Resets the device.
  93. *
  94. * @return none.
  95. *******************************************************************************/
  96. void AD7193_Reset(void)
  97. {
  98.     unsigned char registerWord[6] = {0, 0, 0, 0, 0, 0};
  99.    
  100.     registerWord[0] = 0xFF;
  101.     registerWord[1] = 0xFF;
  102.     registerWord[2] = 0xFF;
  103.     registerWord[3] = 0xFF;
  104.     registerWord[4] = 0xFF;
  105.     registerWord[5] = 0xFF;
  106.     SPI_Write(AD7193_SLAVE_ID, registerWord, 6);
  107. }

  109. /***************************************************************************//**
  110. * @brief Set device to idle or power-down.
  111. *
  112. * @param pwrMode - Selects idle mode or power-down mode.
  113. *                  Example: 0 - power-down
  114. *                           1 - idle
  115. *
  116. * @return none.
  117. *******************************************************************************/
  118. void AD7193_SetPower(unsigned char pwrMode)
  119. {
  120.      unsigned long oldPwrMode = 0x0;
  121.      unsigned long newPwrMode = 0x0;

  123.      oldPwrMode = AD7193_GetRegisterValue(AD7193_REG_MODE, 3, 1);
  124.      oldPwrMode &= ~(AD7193_MODE_SEL(0x7));
  125.      newPwrMode = oldPwrMode |
  126.                   AD7193_MODE_SEL((pwrMode * (AD7193_MODE_IDLE)) |
  127.                                   (!pwrMode * (AD7193_MODE_PWRDN)));
  128.      AD7193_SetRegisterValue(AD7193_REG_MODE, newPwrMode, 3, 1);  
  129. }

  131. /***************************************************************************//**
  132. * @brief Waits for RDY pin to go low.
  133. *
  134. * @return none.
  135. *******************************************************************************/
  136. void AD7193_WaitRdyGoLow(void)
  137. {
  138.     while(AD7193_RDY_STATE)
  139.     {
  140.         ;
  141.     }
  142. }

  144. /***************************************************************************//**
  145. * @brief Selects the channel to be enabled.
  146. *
  147. * @param channel - Selects a channel.
  148. *                  Example: AD7193_CH_0 - AIN1(+) - AIN2(-);  (Pseudo = 0)
  149. *                           AD7193_CH_1 - AIN3(+) - AIN4(-);  (Pseudo = 0)
  150. *                           AD7193_TEMP - Temperature sensor
  151. *                           AD7193_SHORT - AIN2(+) - AIN2(-); (Pseudo = 0)
  152. *  
  153. * @return none.
  154. *******************************************************************************/
  155. void AD7193_ChannelSelect(unsigned short channel)
  156. {
  157.     unsigned long oldRegValue = 0x0;
  158.     unsigned long newRegValue = 0x0;   
  159.      
  160.     oldRegValue = AD7193_GetRegisterValue(AD7193_REG_CONF, 3, 1);
  161.     oldRegValue &= ~(AD7193_CONF_CHAN(0x3FF));
  162.     newRegValue = oldRegValue | AD7193_CONF_CHAN(1 << channel);   
  163.     AD7193_SetRegisterValue(AD7193_REG_CONF, newRegValue, 3, 1);
  164. }

  166. /***************************************************************************//**
  167. * @brief Performs the given calibration to the specified channel.
  168. *
  169. * @param mode - Calibration type.
  170. * @param channel - Channel to be calibrated.
  171. *
  172. * @return none.
  173. *******************************************************************************/
  174. void AD7193_Calibrate(unsigned char mode, unsigned char channel)
  175. {
  176.     unsigned long oldRegValue = 0x0;
  177.     unsigned long newRegValue = 0x0;
  178.    
  179.     AD7193_ChannelSelect(channel);
  180.     oldRegValue = AD7193_GetRegisterValue(AD7193_REG_MODE, 3, 1);
  181.     oldRegValue &= ~AD7193_MODE_SEL(0x7);
  182.     newRegValue = oldRegValue | AD7193_MODE_SEL(mode);
  183.     PMOD1_CS_LOW;
  184.     AD7193_SetRegisterValue(AD7193_REG_MODE, newRegValue, 3, 0); // CS is not modified.
  185.     AD7193_WaitRdyGoLow();
  186.     PMOD1_CS_HIGH;
  187. }

  189. /***************************************************************************//**
  190. * @brief Selects the polarity of the conversion and the ADC input range.
  191. *
  192. * @param polarity - Polarity select bit.
  193.                      Example: 0 - bipolar operation is selected.
  194.                               1 - unipolar operation is selected.
  195. * @param range - Gain select bits. These bits are written by the user to select
  196.                  the ADC input range.     
  197. *
  198. * @return none.
  199. *******************************************************************************/
  200. void AD7193_RangeSetup(unsigned char polarity, unsigned char range)
  201. {
  202.     unsigned long oldRegValue = 0x0;
  203.     unsigned long newRegValue = 0x0;
  204.    
  205.     oldRegValue = AD7193_GetRegisterValue(AD7193_REG_CONF,3, 1);
  206.     oldRegValue &= ~(AD7193_CONF_UNIPOLAR |
  207.                      AD7193_CONF_GAIN(0x7));
  208.     newRegValue = oldRegValue |
  209.                   (polarity * AD7193_CONF_UNIPOLAR) |
  210.                   AD7193_CONF_GAIN(range);
  211.     AD7193_SetRegisterValue(AD7193_REG_CONF, newRegValue, 3, 1);
  212.     /* Store the last settings regarding polarity and gain. */
  213.     currentPolarity = polarity;
  214.     currentGain = 1 << range;
  215. }

  217. /***************************************************************************//**
  218. * @brief Returns the result of a single conversion.
  219. *
  220. * @return regData - Result of a single analog-to-digital conversion.
  221. *******************************************************************************/
  222. unsigned long AD7193_SingleConversion(void)
  223. {
  224.     unsigned long command = 0x0;
  225.     unsigned long regData = 0x0;

  227.     command = AD7193_MODE_SEL(AD7193_MODE_SINGLE) |
  228.               AD7193_MODE_CLKSRC(AD7193_CLK_INT) |
  229.               AD7193_MODE_RATE(0x060);   
  230.     PMOD1_CS_LOW;
  231.     AD7193_SetRegisterValue(AD7193_REG_MODE, command, 3, 0); // CS is not modified.
  232.     AD7193_WaitRdyGoLow();
  233.     regData = AD7193_GetRegisterValue(AD7193_REG_DATA, 3, 0);
  234.     PMOD1_CS_HIGH;
  235.    
  236.     return regData;
  237. }

  239. /***************************************************************************//**
  240. * @brief Returns the average of several conversion results.
  241. *
  242. * @return samplesAverage - The average of the conversion results.
  243. *******************************************************************************/
  244. unsigned long AD7193_ContinuousReadAvg(unsigned char sampleNumber)
  245. {
  246.     unsigned long samplesAverage = 0;
  247.     unsigned long command        = 0;
  248.     unsigned char count          = 0;
  249.         
  250.     command = AD7193_MODE_SEL(AD7193_MODE_CONT) |
  251.               AD7193_MODE_CLKSRC(AD7193_CLK_INT) |
  252.               AD7193_MODE_RATE(0x060);
  253.     PMOD1_CS_LOW;
  254.     AD7193_SetRegisterValue(AD7193_REG_MODE, command, 3, 0); // CS is not modified.
  255.     for(count = 0; count < sampleNumber; count++)
  256.     {
  257.         AD7193_WaitRdyGoLow();
  258.         samplesAverage += AD7193_GetRegisterValue(AD7193_REG_DATA, 3, 0); // CS is not modified.
  259.     }
  260.     PMOD1_CS_HIGH;
  261.     samplesAverage = samplesAverage / sampleNumber;
  262.    
  263.     return samplesAverage;
  264. }

  266. /***************************************************************************//**
  267. * @brief Read data from temperature sensor and converts it to Celsius degrees.
  268. *
  269. * @return temperature - Celsius degrees.
  270. *******************************************************************************/
  271. unsigned long AD7193_TemperatureRead(void)
  272. {
  273.     unsigned long dataReg     = 0;
  274.     unsigned long temperature = 0;   
  275. ……………………

  277. …………限于本文篇幅 余下代码请从51黑下载附件…………
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上图4个代码文件: ad7193_generic.zip (10.93 KB, 下载次数: 27)

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