#include "stm32f1xx_hal.h"

#define AD5232_ADDR 0x2C  // I2C地址

// 写数字电位器
void AD5232_Write(uint8_t channel, uint8_t value) {
  uint8_t data[2];
  data[0] = (channel == 0) ? 0x01 : 0x02;  // 通道选择
  data[1] = value;

  HAL_I2C_Master_Transmit(&hi2c1, AD5232_ADDR<<1,
                          data, 2, HAL_MAX_DELAY);
}

// 设置截止频率
void SetCutoffFreq(float fc_hz) {
  float C = 10e-9;
  float R = 1.0 / (2 * PI * fc_hz * C);

  // AD5232: 50kΩ范围,256步
  uint8_t value = (uint8_t)((R / 50000.0) * 256);

  AD5232_Write(0, value);  // 通道0
}

int main(void) {
  HAL_Init();
  MX_I2C1_Init();

  while(1) {
    // 程控滤波: 1kHz → 10kHz
    for(float f=1000; f<=10000; f+=100) {
      SetCutoffFreq(f);
      HAL_Delay(200);
    }
  }
}