AD5933 iic驱动

AD5933是一款带有I2C接口的可编程阻抗转换器芯片，下面是一个简单的AD5933 I2C驱动示例代码：

#include <Wire.h>

// AD5933 I2C address
#define AD5933_ADDR 0x0D

// Registers
#define CTRL_REG1   0x80
#define CTRL_REG2   0x81
#define CTRL_REG3   0x82
#define FREQ_START  0x85
#define FREQ_INC    0x86
#define NUM_INCR    0x87
#define NUM_SETTL   0x88
#define STATUS_REG  0x8F
#define REAL_DATA   0x94
#define IMAG_DATA   0x96

// Function to write to a register
void writeRegister(uint8_t reg, uint8_t value) {
  Wire.beginTransmission(AD5933_ADDR);
  Wire.write(reg);
  Wire.write(value);
  Wire.endTransmission();
}

// Function to read from a register
uint8_t readRegister(uint8_t reg) {
  uint8_t value;
  Wire.beginTransmission(AD5933_ADDR);
  Wire.write(reg);
  Wire.endTransmission();
  Wire.requestFrom(AD5933_ADDR, (uint8_t)1);
  value = Wire.read();
  return value;
}

// Function to set the start frequency
void setStartFreq(uint32_t freq) {
  uint32_t freqWord = freq * 4 / 1000;
  writeRegister(FREQ_START, (freqWord >> 16) & 0xFF);
  writeRegister(FREQ_START + 1, (freqWord >> 8) & 0xFF);
  writeRegister(FREQ_START + 2, freqWord & 0xFF);
}

// Function to set the frequency increment
void setFreqInc(uint32_t freq) {
  uint32_t freqWord = freq * 4 / 1000;
  writeRegister(FREQ_INC, (freqWord >> 16) & 0xFF);
  writeRegister(FREQ_INC + 1, (freqWord >> 8) & 0xFF);
  writeRegister(FREQ_INC + 2, freqWord & 0xFF);
}

// Function to set the number of increments
void setNumIncr(uint16_t num) {
  writeRegister(NUM_INCR, (num >> 8) & 0xFF);
  writeRegister(NUM_INCR + 1, num & 0xFF);
}

// Function to set the number of settling cycles
void setNumSettl(uint16_t num) {
  writeRegister(NUM_SETTL, (num >> 8) & 0xFF);
  writeRegister(NUM_SETTL + 1, num & 0xFF);
}

// Function to start a frequency sweep
void startSweep() {
  // Set CTRL_REG1
  writeRegister(CTRL_REG1, 0x10); // Reset
  delay(10);
  writeRegister(CTRL_REG1, 0x20); // Start frequency sweep
}

// Function to read the real and imaginary data
void readData(int16_t *real, int16_t *imag) {
  uint8_t status;
  do {
    status = readRegister(STATUS_REG);
  } while ((status & 0x02) == 0); // Wait for valid data
  Wire.beginTransmission(AD5933_ADDR);
  Wire.write(REAL_DATA);
  Wire.endTransmission();
  Wire.requestFrom(AD5933_ADDR, (uint8_t)4);
  *real = ((int16_t)Wire.read() << 8) | Wire.read();
  *imag = ((int16_t)Wire.read() << 8) | Wire.read();
}

void setup() {
  Wire.begin();
  Serial.begin(9600);
  setStartFreq(10000); // Start frequency = 10 kHz
  setFreqInc(1000);    // Frequency increment = 1 kHz
  setNumIncr(10);      // Number of increments = 10
  setNumSettl(10);     // Number of settling cycles = 10
  startSweep();
}

void loop() {
  int16_t real, imag;
  readData(&real, &imag);
  Serial.print("Real: ");
  Serial.print(real);
  Serial.print(", Imag: ");
  Serial.println(imag);
  delay(1000);
}

这是一个简单的AD5933 I2C驱动程序，它可以设置起始频率、频率增量、增量次数和稳定周期，并启动频率扫描。它还包括函数来读取实部和虚部数据。在循环中，我们读取数据并将其发送到串口。