FDC2212电容传感器

  • 前言
  • 一、原理图
  • 二、代码
  • 总结

前言

关于FDC2212电容传感器，TI有参考设计手册“Capacitive-Based Liquid Level Sensing Sensor Reference Design”。讲述了电容传感器的计算，设计，实现液位高度探测，可以应用于咖啡机，洗衣机，实验室自动化，生物医疗等领域。

一、原理图

STM32主控，FDC2212，LDO

二、代码

FDC2212代码如下（示例）：

#include "fdc2214.h"
#include <math.h>int8_t ec = 0;
int8_t ret = 0;/* data buffer */
uint8_t buffer[20];
uint64_t channel_freq_data[4];
uint64_t channel_freq_hz[4];union FDC2214_REG data_wr;
union FDC2214_REG data_rb;uint8_t fdc2214_Check(void)
{if(IIC_CheckAddress())return 1;elsereturn 0;
}int8_t DRV_FDC2214_WriteReg(uint8_t Reg, uint8_t *pData_wr, uint16_t byteSize)
{if(HAL_I2C_Mem_Write(&hi2c1, (FDC2214_ADDR << 1), Reg, I2C_MEMADD_SIZE_8BIT, pData_wr, byteSize, 100)  == HAL_OK){return HAL_OK;}else{return HAL_ERROR;}
}int8_t DRV_FDC2214_ReadReg(uint8_t Reg, uint8_t *pData_wr, uint16_t byteSize)
{if(HAL_I2C_Mem_Read(&hi2c1, (FDC2214_ADDR << 1), Reg, I2C_MEMADD_SIZE_8BIT, pData_wr, byteSize, 100) == HAL_OK){return HAL_OK;}else{return HAL_ERROR;}
}int8_t DRV_FDC2214_Config(void)
{/*REG_RESET_DEV: reset the device*/data_wr.byte[0] = (REG_RESET_DEV_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_RESET_DEV_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_RESET_DEV, (uint8_t *)&data_wr, 2);HAL_Delay(10);/*REG_CLOCK_DIVIDERS_CH0/1/2/3*/data_wr.byte[0] = (REG_CLOCK_DIVIDERS_CHx_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_CLOCK_DIVIDERS_CHx_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_CLOCK_DIVIDERS_CH0, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_CLOCK_DIVIDERS_CH0, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC2;}ret = DRV_FDC2214_WriteReg(REG_CLOCK_DIVIDERS_CH1, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_CLOCK_DIVIDERS_CH1, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC2;}ret = DRV_FDC2214_WriteReg(REG_CLOCK_DIVIDERS_CH2, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_CLOCK_DIVIDERS_CH2, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC2;}ret = DRV_FDC2214_WriteReg(REG_CLOCK_DIVIDERS_CH3, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_CLOCK_DIVIDERS_CH3, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC2;}/*REG_DRIVE_CURRENT_CH0/1/2/3 */data_wr.byte[0] = (REG_DRIVE_CURRENT_CHx_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_DRIVE_CURRENT_CHx_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_DRIVE_CURRENT_CH0, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_DRIVE_CURRENT_CH0, (uint8_t *)&data_rb, 2);if((data_wr.all & 0xf800) != (data_rb.all & 0xf800)){ec |= FDC_CONF_EC5;}ret = DRV_FDC2214_WriteReg(REG_DRIVE_CURRENT_CH1, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_DRIVE_CURRENT_CH1, (uint8_t *)&data_rb, 2);if((data_wr.all & 0xf800) != (data_rb.all & 0xf800)){ec |= FDC_CONF_EC5;}ret = DRV_FDC2214_WriteReg(REG_DRIVE_CURRENT_CH2, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_DRIVE_CURRENT_CH2, (uint8_t *)&data_rb, 2);if((data_wr.all & 0xf800) != (data_rb.all & 0xf800)){ec |= FDC_CONF_EC5;}ret = DRV_FDC2214_WriteReg(REG_DRIVE_CURRENT_CH3, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_DRIVE_CURRENT_CH3, (uint8_t *)&data_rb, 2);if((data_wr.all & 0xf800) != (data_rb.all & 0xf800)){ec |= FDC_CONF_EC5;}/*REG_SETTLECOUNT_CH0/1/2/3*/data_wr.byte[0] = (REG_SETTLECOUNT_CHx_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_SETTLECOUNT_CHx_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_SETTLECOUNT_CH0, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_SETTLECOUNT_CH0, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC1;}ret = DRV_FDC2214_WriteReg(REG_SETTLECOUNT_CH1, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_SETTLECOUNT_CH1, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC1;}ret = DRV_FDC2214_WriteReg(REG_SETTLECOUNT_CH2, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_SETTLECOUNT_CH2, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC1;}ret = DRV_FDC2214_WriteReg(REG_SETTLECOUNT_CH3, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_SETTLECOUNT_CH3, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC1;}/*REG_RCOUNT_CH0/1/2/3*/data_wr.byte[0] = (REG_RCOUNT_CHx_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_RCOUNT_CHx_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_RCOUNT_CH0, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_RCOUNT_CH0, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC0;}ret = DRV_FDC2214_WriteReg(REG_RCOUNT_CH1, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_RCOUNT_CH1, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC0;}ret = DRV_FDC2214_WriteReg(REG_RCOUNT_CH2, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_RCOUNT_CH2, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC0;}ret = DRV_FDC2214_WriteReg(REG_RCOUNT_CH3, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_RCOUNT_CH3, (uint8_t *)&data_rb, 2);if(data_wr.all != data_rb.all){ec |= FDC_CONF_EC0;}/*REG_ERROR_CONFIG:*/data_wr.byte[0] = (REG_ERROR_CONFIG_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_ERROR_CONFIG_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_ERROR_CONFIG, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_ERROR_CONFIG, (uint8_t *)&data_rb, 2);if((data_wr.all & 0x01) == (data_rb.all & 0x01)){ec |= FDC_CONF_EC0;}/*REG_MUX_CONFIG*/data_wr.byte[0] = (REG_MUX_CONFIG_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_MUX_CONFIG_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_MUX_CONFIG, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_MUX_CONFIG, (uint8_t *)&data_rb, 2);if((data_wr.all & 0xe007) == (data_rb.all & 0xe007)){ec |= FDC_CONF_EC0;}/*REG_CONFIG*/data_wr.byte[0] = (REG_CONFIG_CFG & 0xff00) >> 8;data_wr.byte[1] = REG_CONFIG_CFG & 0x00ff;ret = DRV_FDC2214_WriteReg(REG_CONFIG, (uint8_t *)&data_wr, 2);HAL_Delay(1);data_rb.all = 0;ret = DRV_FDC2214_ReadReg(REG_CONFIG, (uint8_t *)&data_rb, 2);if((data_wr.all & 0xffc0) != (data_rb.all & 0xffc0)){ec |= FDC_CONF_EC6;}return ec;
}void get_channel_cap_pf(double* channel_cap_pf)
{while(GPIO_PIN_SET == HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_9));
//  if(GPIO_PIN_SET == HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_9))DRV_FDC2214_ReadReg(REG_DATA_CH0, buffer, 2);channel_freq_data[0] = (buffer[0] << 8) + buffer[1];DRV_FDC2214_ReadReg(REG_DATA_LSB_CH0, buffer, 2);channel_freq_data[0] =  (channel_freq_data[0] << 16) + (buffer[0] << 8) + buffer[1];channel_freq_hz[0] =  channel_freq_data[0] * CRYSTAL_FREQ_HZ >> 28;channel_cap_pf[0] = pow(10, 12) / (pow(2 * PI * channel_freq_hz[0], 2) * INDUCTANCE_UH * pow(10, -6));DRV_FDC2214_ReadReg(REG_DATA_CH1, buffer, 2);channel_freq_data[1] = (buffer[0] << 8) + buffer[1];DRV_FDC2214_ReadReg(REG_DATA_LSB_CH1, buffer, 2);channel_freq_data[1] =  (channel_freq_data[1] << 16) + (buffer[0] << 8) + buffer[1];channel_freq_hz[1] =  channel_freq_data[1] * CRYSTAL_FREQ_HZ >> 28;channel_cap_pf[1] = pow(10, 12) / (pow(2 * PI * channel_freq_hz[1], 2) * INDUCTANCE_UH * pow(10, -6));DRV_FDC2214_ReadReg(REG_DATA_CH2, buffer, 2);channel_freq_data[2] = (buffer[0] << 8) + buffer[1];DRV_FDC2214_ReadReg(REG_DATA_LSB_CH2, buffer, 2);channel_freq_data[2] =  (channel_freq_data[2] << 16) + (buffer[0] << 8) + buffer[1];channel_freq_hz[2] =  channel_freq_data[2] * CRYSTAL_FREQ_HZ >> 28;channel_cap_pf[2] = pow(10, 12) / (pow(2 * PI * channel_freq_hz[2], 2) * INDUCTANCE_UH * pow(10, -6));DRV_FDC2214_ReadReg(REG_DATA_CH3, buffer, 2);channel_freq_data[3] = (buffer[0] << 8) + buffer[1];DRV_FDC2214_ReadReg(REG_DATA_LSB_CH3, buffer, 2);channel_freq_data[3] =  (channel_freq_data[3] << 16) + (buffer[0] << 8) + buffer[1];channel_freq_hz[3] =  channel_freq_data[3] * CRYSTAL_FREQ_HZ >> 28;channel_cap_pf[3] = pow(10, 12) / (pow(2 * PI * channel_freq_hz[3], 2) * INDUCTANCE_UH * pow(10, -6));DRV_FDC2214_ReadReg(REG_STATUS, buffer, 2);
}

总结

本文中设计的FDC2电容传感器可以读取外置电容数值，测量液位高度。FDC2212扩展应用领域包括纸张计数，手势控制等。

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