前言
AFE94X多通道同步采集，64KSPS,24bit SD_ADC AFE94X
驗證驅動，阻塞等待DRDY(僅驗證驅動使用),兼容-類比芯片STM32HAL庫SPI
https://blog.csdn.net/hhhhwdnmd/article/details/135774192?spm=1001.2014.3001.5501
一、AFE94X是什么？
AFE94X是多通道同步采樣 24 位 Δ-Σ 模數轉換器(ADC)系列，內置有可編程增益放大器(PGA)、內部基準以及板載振蕩器。AFE94x 包含醫(yī)療心電圖(ECG)和腦電圖(EEG)應用中通
常所需的全部功能。憑借高集成度和出色性能，AFE94x能夠以大幅縮小的尺寸、顯著降低的功耗和整體成本開發(fā)可擴展的醫(yī)療儀器系統(tǒng)。文章來源：http://www.zghlxwxcb.cn/news/detail-858026.html
二、使用步驟
1.AFE94X.h
/*
Analogysemi xutong
2023/02/15
*/
#ifndef __AFE94X_H
#define __AFE94X_H
#include "bsp_lpspi.h"
#include "stm32f4xx.h"
#define AFE94x_START_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define AFE94x_PWDN_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define AFE94x_DRDY_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define AFE94x_REST_GPIO_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE()
/* Definition for AFE94x Pins */
#define AFE94x_START_PIN GPIO_PIN_8
#define AFE94x_START_GPIO_PORT GPIOA
#define AFE94x_DRDY_PIN GPIO_PIN_12
#define AFE94x_DRDY_GPIO_PORT GPIOA
#define AFE94x_PWDN_PIN GPIO_PIN_11
#define AFE94x_PWDN_GPIO_PORT GPIOA
#define AFE94x_REST_PIN GPIO_PIN_1
#define AFE94x_REST_GPIO_PORT GPIOB
/*command define*/
#define AFE94X_WAKEUP 0x02
#define AFE94X_STANDBY 0x04
#define AFE94X_RESET 0x06
#define AFE94X_START 0x08
#define AFE94X_STOP 0x0A
#define AFE94X_RDATAC 0x10
#define AFE94X_SDATAC 0x11
#define AFE94X_RDATA 0x12
#define AFE94X_OFFSETCAL 0x1A
#define AFE94X_RREG 0X20
#define AFE94X_WREG 0X40
#define AFE94X_RREGX 0xE4
#define AFE94X_WREGX 0xE8
//RREG Read n nnnn registers starting at address r rrrr
//First Byte 001r rrrr (2xh)
//Second Byte 000n nnnn
//n nnnn = number of registers to be read or written – 1. For example, to read or write three registers, set n nnnn = 0 (0010). r rrrr = the
//starting register address for read and write commands
//WREG 同上
//WREG First Byte (4xh)
/*
寄存器地址
*/
#define AFE94X_ID 0x00
#define AFE94X_CONFIG1 0x01
#define AFE94X_CONFIG2 0x02
#define AFE94X_CONFIG3 0x03
#define AFE94X_LOFF 0x04
#define AFE94X_CH1SET 0X05
#define AFE94X_CH2SET 0X06
#define AFE94X_CH3SET 0X07
#define AFE94X_CH4SET 0X08
#define AFE94X_CH5SET 0X09
#define AFE94X_CH6SET 0X0A
#define AFE94X_CH7SET 0X0B
#define AFE94X_CH8SET 0X0C
#define AFE94X_RLD_SENSP 0X0D
#define AFE94X_RLD_SENSN 0X0E
#define AFE94X_LOFF_SENSP 0X0F
#define AFE94X_LOFF_SENSN 0X10
#define AFE94X_LOFF_FLIP 0X11
#define LOFF_STATP_Status 0X12
#define LOFF_STATN_Status 0X13
#define AFE94X_GPIO 0X14
#define AFE94X_PACE 0X15
#define AFE94X_RESV 0X16
#define AFE94X_CONFIG4 0X17
#define AFE94X_WCT1 0X18
#define AFE94X_WCT2 0X19
#define AFE94X_WCT3 0X1A
#define AFE94X_CONFIG5 0X1C
#define AFE94X_CONFIG6 0X1D
#define AFE94X_CONFIG7 0X1E
#define AFE94X_CONFIG8 0X1F
#define AFE94X_CONFIG9 0X20
#define AFE94X_LOFF_CFCG1 0X21
#define AFE94X_LOFF_CFCG2 0X22
#define AFE94X_LOFF_ACLO1 0X23
#define AFE94X_LOFF_ACLO2 0X24
#define AFE94X_REDR2P 0X25
#define AFE94X_CHMUX_MSB 0X26
#define AFE94X_LOFF_CMP_FLIP 0X27
#define AFE94X_LOFF_SENSN1 0X28
#define AFE94X_LOFF_SENSP1 0X29
#define AFE94X_SRB1_COFIG 0X2A
#define AFE94X_BIAS_DAC 0X2B
#define AFE94X_XOSC_CFG 0X2C
#define AFE94X_LOW_NOISE 0X2E
#define AFE94X_MISC_ANA 0X34
#define AFE94X_MOD_STAT 0X35
#define AFE94X_CMD_STAT 0X36
#define AFE94X_PGAP_OOR 0X37
#define AFE94X_PGAN_OOR 0X28
/*
寄存器設置
*/
//CONFIG2
#define EXT_TEST_ON 0X00 //關閉內部測試信號,外部（默認）
#define INT_TEST_ON 0X10
//CONFIG3
#define INT_REF_EN 0X80 //內部基準(default)
#define EXT_REF_EN 0X00 //外部基準
#define AFE94X_REF_2_4V 0X00 //default
#define AFE94X_REF_4V 0X20
#define RLD_REF_PD_EN 0X04 //default
#define RLD_REF_PD_DIS 0X00
#define AFE94X_RLDREF_INT 0X08
#define AFE94X_RLDREF_EXT 0X00 //default
#define AFE94X_RLD_BUF_EN 0X04
#define AFE94X_RLD_BUF_DIS 0X00 //default
#define RLD_LOFF_SENS_EN 0X02
#define RLD_LOFF_SENS_DIS 0X00 //default
#define RLD_STAT_EN 0X00 //default
#define RLD_STAT_DIS 0X01
//LOFF
#define AFE94X_COMP_95_5 0X00
#define AFE94X_COMP_92_7 0X20
#define AFE94X_COMP_90_8 0X40
#define AFE94X_COMP_87_12 0X60
#define AFE94X_COMP_85_15 0X80
#define AFE94X_COMP_80_20 0XA0
#define AFE94X_COMP_75_25 0XC0
#define AFE94X_COMP_70_30 0XE0
#define LEAD_CURRENT_9NA 0X00
#define LEAD_CURRENT_18NA 0X03
#define LEAD_CURRENT_27NA 0X04
#define LEAD_CURRENT_40NA 0X0C
#define FLEAD_AC_LEAD 0X01
#define FLEAD_DC_LEAD 0X03
//CHXSET
#define AFE94X_CH_PD 0X80 //Channel power-down
#define AFE94X_CH_EN 0X00 //Normal operation
#define AFE94X_PGA_1 0X10
#define AFE94X_PGA_2 0X20
#define AFE94X_PGA_3 0X30
#define AFE94X_PGA_4 0X40
#define AFE94X_PGA_6 0X00 //default
#define AFE94X_PGA_8 0X40
#define AFE94X_PGA_12 0X60
#define AFE94X_PGA_24 0X70
#define MUX_Normal_input 0X00 //普通電極輸入（默認）
#define MUX_Input_shorted 0X01 //輸入短路
#define MUX_RLD_Test 0x02
#define MUX_Test_signal 0X05 //測試信號輸入
#define MUX_RLD_DRP 0X06
#define MUX_RLD_DRN 0X07
#define MUX_RLD_DRPM 0X00 //CHX_MUX_MSB must set CHX_MUX_MSB|MUXn = 1000
#define MUX_RSP_RESP 0X01 //CHX_MUX_MSB must set CHX_MUX_MSB|MUXn = 1001
#define MUX_AFE_BYPASS 0X02 //CHX_MUX_MSB must set CHX_MUX_MSB|MUXn = 1010
//CONFIG4
#define AFE94X_SHOT_MODE 0X20
#define AFE94X_CONT_MODE 0X00 //default
#define AFE94X_COMP_PDEN 0X02
#define AFE94X_COMP_PDDIS 0X00 //default
#define WCT_RLD_CONNECT 0X01
//WCT1
#define PD_WCTA_DIS 0X00 //default
#define PD_WCTA_EN 0X08
#define WCTA_AIN1P_Amp 0X00
#define WCTA_AIN1N_Amp 0X01
#define WCTA_AIN2P_Amp 0X02
#define WCTA_AIN2N_Amp 0X03
#define WCTA_AIN3P_Amp 0X04
#define WCTA_AIN3N_Amp 0X05
#define WCTA_AIN4P_Amp 0X06
#define WCTA_AIN4N_Amp 0X07
//WCT2
#define PD_WCTC_DIS 0X00 //default
#define PD_WCTC_EN 0X80
#define PD_WCTB_DIS 0X00
#define PD_WCTB_EN 0X40 //default
#define WCTB_AIN1P_Amp 0X00
#define WCTB_AIN1N_Amp 0X08
#define WCTB_AIN2P_Amp 0X10
#define WCTB_AIN2N_Amp 0X18
#define WCTB_AIN3P_Amp 0X20
#define WCTB_AIN3N_Amp 0X28
#define WCTB_AIN4P_Amp 0X30
#define WCTB_AIN4N_Amp 0X38
#define WCTC_AIN1P_Amp 0X00
#define WCTC_AIN1N_Amp 0X01
#define WCTC_AIN2P_Amp 0X02
#define WCTC_AIN2N_Amp 0X03
#define WCTC_AIN3P_Amp 0X04
#define WCTC_AIN3N_Amp 0X05
#define WCTC_AIN4P_Amp 0X06
#define WCTC_AIN4N_Amp 0X07
//WCT3
#define WCT_SW7_OFF 0X00 //default
#define WCT_SW7_ON 0X80
#define WCT_SW6_OFF 0X00 //default
#define WCT_SW6_ON 0X40
#define WCT_SW5_OFF 0X00 //default
#define WCT_SW5_ON 0X20
#define WCT_SW4_OFF 0X00 //default
#define WCT_SW4_ON 0X10
#define WCT_SW4_EN 0X08
#define WCT_SW4_DIS 0X00 //default
#define WCT_BUF_LOW 0X04 //default
#define WCT_BUF_HIGH 0X00
#define WCT_BYPASS_BUF 0X01
//CONFIG5
#define INT_OSC_2M 0X00 //default Internal OSC frequency 2M
#define INT_OSC_1M 0X40 //Internal OSC frequency 1M
#define INT_OSC_0_5M 0X80 //Internal OSC frequency 512K
#define INT_OSC_0_2M 0XC0 //Internal OSC frequency 216K
#define AFE94X_HS_MODE 0X02
#define AFE94X_LP_MODE 0X01
//L0FF_CGF2
#define RLD_COMP_95_5 0X00 //default
#define RLD_COMP_92_7 0X04
#define RLD_COMP_90_8 0X08
#define RLD_COMP_87_12 0X0C
#define RLD_COMP_85_15 0X10
#define RLD_COMP_80_20 0X14
#define RLD_COMP_75_25 0X18
#define RLD_COMP_70_30 0X38
#define LEAD_Debounce_DIS 0X00 //default
#define LEDA_Debounce_117 0x01
//CHMUX_MSB
#define CH8_MUX_MSB 0X80
#define CH7_MUX_MSB 0X40
#define CH6_MUX_MSB 0X20
#define CH5_MUX_MSB 0X10
#define CH4_MUX_MSB 0X08
#define CH3_MUX_MSB 0X04
#define CH2_MUX_MSB 0X02
#define CH1_MUX_MSB 0X01
//GPIO
#define GPIOD_GPIO1 0X10
#define GPIOD_GPIO2 0X20
#define GPIOD_GPIO3 0X40
#define GPIOD_GPIO4 0X80
#define GPIO_IN_GPIO1 0X01
#define GPIO_IN_GPIO2 0X02
#define GPIO_IN_GPIO3 0X04
#define GPIO_IN_GPIO4 0X08
#define GPIO_OUT_GPIO1 0X00
#define GPIO_OUT_GPIO2 0X00
#define GPIO_OUT_GPIO3 0X00
#define GPIO_OUT_GPIO4 0X00
//LOFF_CFG1
#define RLD_COMP_EN
#define CUR_LEVEL
//RLD_DAC
#define RLD_DAC_EN 0X80
#define RLD_DAC_DIS 0X00
#define RLD_REF_AVDD 0X00
#define RLD_REF_AREEP 0X40
/*
通道選擇
channel select
*/
#define AFE94X_AIN1 0
#define AFE94X_AIN2 1
#define AFE94X_AIN3 2
#define AFE94X_AIN4 3
#define AFE94X_AIN5 4
#define AFE94X_AIN6 5
#define AFE94X_AIN7 6
#define AFE94X_AIN8 7
//寫命令
void AFE9XX_Command(uint8_t Com);
//獲取芯片的ID號
uint8_t AFE9XX_GetChipID(void);
//獲取寄存器值
uint8_t AFE9XX_GetReg(uint8_t Rreg);
//獲取多個寄存器值
void AFE9XX_ReadMultiReg(uint8_t StartReg,uint8_t RegNum,uint8_t *Data);
//寫入寄存器值
void AFE9XX_WriteReg(uint8_t Wreg,uint8_t Data);
//寫多個寄存器的值
void AFE9XX_WriteMultiReg(uint8_t StartReg,uint8_t RegNum,uint8_t *Data);
//獲取所有寄存器值
void AFE9XX_GetAllReg(void);
//設定通道并且獲取ADC的值
// CH設置為 0或者設通道0/1
void AFE9XX_GetADC_Value(uint8_t AIN_P,uint8_t AIN_N,uint8_t *Rxdata);
//初始化AFE9XX
void AFE9XX_Init(void);
//獲取通道ADC值
float AFE9xx_GetValue(uint8_t AIN_CH,uint8_t AFE94X_REF,uint8_t *Rxdata);
//獲取所有通道ADC值
void AFE94X_GetAllValue(uint8_t AFE94X_REF,uint8_t *Rxdata,float *Voltage);
//獲取內部溫度傳感器值
float AFE9XX_GetTempture(uint8_t *Rxdata);
//獲取設備噪聲值
float AFE9XX_Noise_Test(uint8_t *Rxdata);
//電源測試
float AFE9XX_PWR_Test(uint8_t *Rxdata);
//直流導聯(lián)脫落
void AFE9XX_DCLEAD_OFF(uint8_t *Rxdata);
//內部信號測試
void AFE9XX_SINGLE_TEST(uint8_t *Rxdata);
void TEST_RLD_SINGLE(uint8_t *Rxdata);
#endif
2.AFE94X.c
代碼如下（示例）：文章來源地址http://www.zghlxwxcb.cn/news/detail-858026.html
#include "AFE94X.h"
//初始化AF94X
void AFE9XX_Init(void)
{
//拉PWDN和RST
GPIO_InitTypeDef GPIO_Initure;
AFE94x_START_GPIO_CLK_ENABLE(); //開啟START時鐘
AFE94x_PWDN_GPIO_CLK_ENABLE(); //開啟PWDN時鐘
AFE94x_DRDY_GPIO_CLK_ENABLE(); //開啟DRDY時鐘
AFE94x_REST_GPIO_CLK_ENABLE(); //開啟REST時鐘
GPIO_Initure.Pin=AFE94x_DRDY_PIN; //DRDY
GPIO_Initure.Mode=GPIO_MODE_INPUT;
GPIO_Initure.Pull=GPIO_PULLUP;
GPIO_Initure.Speed=GPIO_SPEED_HIGH;
HAL_GPIO_Init(AFE94x_DRDY_GPIO_PORT,&GPIO_Initure);
GPIO_Initure.Pin=AFE94x_PWDN_PIN; //PWDN
GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;
GPIO_Initure.Pull=GPIO_PULLUP;
GPIO_Initure.Speed=GPIO_SPEED_HIGH;
HAL_GPIO_Init(AFE94x_PWDN_GPIO_PORT,&GPIO_Initure);
GPIO_Initure.Pin=AFE94x_START_PIN; //START
GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;
GPIO_Initure.Pull=GPIO_PULLUP;
GPIO_Initure.Speed=GPIO_SPEED_HIGH;
HAL_GPIO_Init(AFE94x_START_GPIO_PORT,&GPIO_Initure);
GPIO_Initure.Pin=AFE94x_REST_PIN; //REST
GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;
GPIO_Initure.Pull=GPIO_PULLUP;
GPIO_Initure.Speed=GPIO_SPEED_HIGH;
HAL_GPIO_Init(AFE94x_REST_GPIO_PORT,&GPIO_Initure);
HAL_GPIO_WritePin(AFE94x_PWDN_GPIO_PORT,AFE94x_PWDN_PIN,1); //拉高PWDN
HAL_GPIO_WritePin(AFE94x_REST_GPIO_PORT,AFE94x_REST_PIN,0); //拉低REST
HAL_Delay(1);
HAL_GPIO_WritePin(AFE94x_REST_GPIO_PORT,AFE94x_REST_PIN,1); //拉低REST
HAL_GPIO_WritePin(AFE94x_START_GPIO_PORT,AFE94x_START_PIN,0);//START
AFE9XX_Command(AFE94X_RESET);
}
//獲取芯片的ID號
uint8_t AFE9XX_GetChipID(void)
{
uint8_t ID;
ID=AFE9XX_GetReg(AFE94X_ID);
return ID;
}
//獲取芯片寄存器值
uint8_t AFE9XX_GetReg(uint8_t Rreg)
{
uint8_t TxData[3];
uint8_t RxData[3];
uint8_t Reg_Val=0;
//寄存器地址小于0X1F
if(Rreg <= 0X1F)
{
//讀取命令，選擇要讀取的寄存器
TxData[0]=AFE94X_RREG|Rreg;
//讀取單個寄存器
TxData[1]=0x00;
Lpspi_Read(3,TxData,RxData);
//返回寄存器值
}
//寄存器地址大于0X1F
else
{
//獲取CONFIG8寄存器Value
Reg_Val=AFE9XX_GetReg(AFE94X_CONFIG8);
//寫入CONFIG8寄存器地址偏移命令，
TxData[0]=AFE94X_WREG|AFE94X_CONFIG8;
//選擇要寫入的的寄存器
TxData[1]=0x00;
//讀取寫入寄存器
TxData[2]=Reg_Val|0x80; //SET ADDR_OFFSET
Lpspi_Write(3,TxData);
//讀取命令，
TxData[0]=AFE94X_RREG|Rreg;
//選擇要讀取的寄存器
TxData[1]=0x00;
//開始讀取
Lpspi_Read(3,TxData,RxData);
//返回寄存器值
//清除CONFIG8寄存器地址偏移位，
TxData[0]=AFE94X_WREG|AFE94X_CONFIG8;
//選擇要寫入的的寄存器
TxData[1]=0x00;
//讀取寫入寄存器
TxData[2]=Reg_Val&0X7F; //Clear ADDR_OFFSET
Lpspi_Write(3,TxData);
}
return RxData[2];
}
//寫單個芯片寄存器值
void AFE9XX_WriteReg(uint8_t Wreg,uint8_t Data)
{
uint8_t TxData[3];
uint8_t Reg_Val=0;
//寄存器地址小于0X1F
if(Wreg<=0x1F)
{
//寫入命令，
TxData[0]=AFE94X_WREG|Wreg;
//選擇要寫入的的寄存器
TxData[1]=0x00;
//讀取寫入寄存器
TxData[2]=Data;
Lpspi_Write(3,TxData);
}
//寄存器地址大于0X1F
else
{
//獲取CONFIG8寄存器Value
Reg_Val=AFE9XX_GetReg(AFE94X_CONFIG8);
//寫入CONFIG8寄存器地址偏移命令，
TxData[0]=AFE94X_WREG|AFE94X_CONFIG8;
//選擇要寫入的的寄存器
TxData[1]=0x00;
//讀取寫入寄存器
TxData[2]=Reg_Val|0x80; //SET ADDR_OFFSET
Lpspi_Write(3,TxData);
//寫入命令，
TxData[0]=AFE94X_WREG|Wreg;
//選擇要寫入的的寄存器
TxData[1]=0x00;
//讀取寫入寄存器
TxData[2]=Data;
Lpspi_Write(3,TxData);
//清除MISC_ANA寄存器地址偏移位，
TxData[0]=AFE94X_WREG|AFE94X_CONFIG8;
//選擇要寫入的的寄存器
TxData[1]=0x00;
//讀取寫入寄存器
TxData[2]=Reg_Val&0X7F; //Clear ADDR_OFFSET
Lpspi_Write(3,TxData);
}
}
//寫多個芯片寄存器值
//StartReg 起始寄存器地址
//RegNum 要寫的寄存器數量
//*Data 寄存器參數傳入
void AFE9XX_WriteMultiReg(uint8_t StartReg,uint8_t RegNum,uint8_t *Data)
{
uint8_t TxData[52];
uint8_t i;
//寫入命令，
TxData[0]=AFE94X_WREGX;
TxData[1]=StartReg;
//選擇要寫入的的寄存器
TxData[2]=RegNum-1;
for(i=1;i<=RegNum;i++)
{
//將指針數據賦值給Txdata
TxData[2+i]=*Data;
//指向下個數據地址
Data++;
}
//最終發(fā)送多少個數據
Lpspi_Write(3+RegNum,TxData);
}
//讀多個芯片寄存器值
//StartReg 起始寄存器地址
//RegNum 要寫的寄存器數量
//*Data 寄存器參數傳出
void AFE9XX_ReadMultiReg(uint8_t StartReg,uint8_t RegNum,uint8_t *Data)
{
//讀取寄存器
uint8_t TxData[24]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
//讀取命令，
TxData[0]=AFE94X_RREGX;
TxData[1]=StartReg;
//選擇要寫入的的寄存器
TxData[2]=RegNum-1;
//最終接收多少個數據
Lpspi_Read(3+RegNum,TxData,Data);
}
//發(fā)送AFE9XX 數據指令 如SDATAC或者RDATAC
//詳情見頭文件command define部分
void AFE9XX_Command(uint8_t Com)
{
uint8_t TxData[1];
TxData[0]=Com;
Lpspi_Write(1,TxData);
}
//測量固有噪聲
//返回噪聲值
float AFE9XX_Noise_Test(uint8_t *Rxdata)
{
//set->pga=1 and Input shorted (for offset or noise measurements)
uint8_t Chset[]={0X11,0X11,0X11,0X11,0X11,0X11,0X11,0X11,0X11,0X11};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint32_t AD_Value=0;
float Voltage;
//停止連續(xù)讀數據
AFE9XX_Command(AFE94X_SDATAC);
//PGA_Gain set 1
AFE9XX_WriteMultiReg(AFE94X_CH1SET,8,Chset);
//singel shot mode
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_SHOT_MODE);
//SET 250SPS
AFE9XX_WriteReg(AFE94X_CONFIG1,0x06);
AFE9XX_WriteReg(AFE94X_CONFIG2,0x00);
//設置內部基準默認基準2.4V
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
//select single Channel Value
AD_Value = (Rxdata[3]<<16|Rxdata[4]<<8|Rxdata[5]);
//MSB=1->采集數據為負數
if((AD_Value>>16)&0X80)
{
AD_Value = ~AD_Value;
AD_Value = AD_Value&0X7FFFFF;
}
Voltage = (AD_Value*(2.4/8388607))*1000;
return Voltage;
}
//測量內部測試信號1mv(VREF->2.4V)
void AFE9XX_SINGLE_TEST(uint8_t *Rxdata)
{
//Select Test sigle
uint8_t Chset[]={0X05,0X05,0015,0X05,0X05,0X05,0X05,0X05,0X05,0X05};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
//停止連續(xù)數據傳輸
AFE9XX_Command(AFE94X_SDATAC);
AFE9XX_WriteMultiReg(AFE94X_CH1SET,8,Chset);
AFE9XX_WriteReg(AFE94X_CONFIG2,0x10);
//設置內部基準
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF_2_4V);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
}
//電源測量
float AFE9XX_PWR_Test(uint8_t *Rxdata)
{
//SET PGA=1 AND
uint8_t CHSET[]={0X13,0X13,0X13,0X13,0X13,0X13,0X13,0X13};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint32_t AD_Value=0;
float Voltage;
//停止連續(xù)讀數據
AFE9XX_Command(AFE94X_SDATAC);
//PGA_Gain set 1
AFE9XX_WriteMultiReg(AFE94X_CH1SET,8,CHSET);
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_SHOT_MODE);
AFE9XX_WriteReg(AFE94X_CONFIG1,0x06);
AFE9XX_WriteReg(AFE94X_CONFIG2,0x00);
//設置內部基準4V
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF_4V);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
//select single Channel Value
AD_Value = (Rxdata[3]<<16|Rxdata[4]<<8|Rxdata[5]);
if((AD_Value>>16)&0X80) //MSB=1->采集數據為負數
{
AD_Value = ~AD_Value;
AD_Value = AD_Value&0X7FFFFF;
}
Voltage = (AD_Value*(4.0/8388607))*1000;
return Voltage;
}
void AFE9XX_DCLEAD_OFF(uint8_t *Rxdata)
{
//Select loff channel
uint8_t PGA_Gain[]={0X10,0X10,0X10,0X10,0X10,0X10,0X10,0X10};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
//停止連續(xù)數據傳輸
AFE9XX_Command(AFE94X_SDATAC);
//使能直流導聯(lián)脫落,設置比較閾值
AFE9XX_WriteReg(AFE94X_LOFF,AFE94X_COMP_70_30|FLEAD_DC_LEAD);
//內部比較器上電
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_COMP_PDEN);
//選擇使能導聯(lián)脫離通道
AFE9XX_WriteReg(AFE94X_LOFF_SENSN,0XFF);
AFE9XX_WriteReg(AFE94X_LOFF_SENSP,0XFF);
//設置內部基準
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF_4V);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
}
//讀溫度傳感器
//返回溫度值℃
float AFE9XX_GetTempture(uint8_t *Rxdata)
{
uint8_t PGA_Gain[]={0X14,0X14,0X14,0X14,0X14,0X14,0X14,0X14};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint32_t AD_Value=0;
float Temp_Value;
//停止連續(xù)讀數據
AFE9XX_Command(AFE94X_SDATAC);
//PGA_Gain set 1
AFE9XX_WriteMultiReg(AFE94X_CH1SET,8,PGA_Gain);
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_SHOT_MODE);
AFE9XX_WriteReg(AFE94X_CONFIG1,0x06);
AFE9XX_WriteReg(AFE94X_CONFIG2,0x00);
//設置內部基準
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF_2_4V);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
//select single Channel Value
AD_Value = (Rxdata[3]<<16|Rxdata[4]<<8|Rxdata[5]);
if((AD_Value>>16)&0X80) //MSB=1->采集數據為負數
{
AD_Value = ~AD_Value;
AD_Value = AD_Value&0X7FFFFF;
}
Temp_Value = (((AD_Value*(2.4/8388607))*1000000-143200)/481)+25;
return Temp_Value;
}
//讀單個ADC通道電壓值(PGA=1)
//AIN_Channel 要讀ADC通道
//AFE94X_REF 內部基準選擇
//返回單通道ADC電壓值（mv）
float AFE9xx_GetValue(uint8_t AIN_CH,uint8_t AFE94X_REF,uint8_t *Rxdata)
{
uint8_t PGA_Gain[]={0X10,0X10,0X10,0X10,0X10,0X10,0X10,0X10};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint32_t AD_Value=0;
float Voltage;
//停止連續(xù)讀數據
AFE9XX_Command(AFE94X_SDATAC);
//PGA_Gain set 1
AFE9XX_WriteMultiReg(AFE94X_CH1SET,8,PGA_Gain);
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_SHOT_MODE);
AFE9XX_WriteReg(AFE94X_CONFIG1,0x06);
AFE9XX_WriteReg(AFE94X_CONFIG2,0x00);
//設置內部基準4V
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
//select single Channel Value
AD_Value = (Rxdata[3+(AIN_CH*3)]<<16|Rxdata[4+(AIN_CH*3)]<<8|Rxdata[5+(AIN_CH*3)]);
//MSB=1->采集數據為負數
if((AD_Value>>16)&0X80)
{
AD_Value = ~AD_Value;
AD_Value = AD_Value&0X7FFFFF;
}
//內部基準選擇2.4V
if(AFE94X_REF==AFE94X_REF_2_4V)
{
Voltage = (AD_Value*(2.4/8388607))*1000;
}
//內部基準選擇4V
else if(AFE94X_REF==AFE94X_REF_4V)
{
Voltage = (AD_Value*(4.0/8388607))*1000;
}
//外部基準
else if(AFE94X_REF == EXT_REF_EN)
{
//Voltage = (AD_Value*(LSB)*1000;
}
return Voltage;
}
//讀多通道ADC電壓值（PGA=1）
//AFE94X_REF 基準選擇
// * AFE94X_REF_2_4V
// * AFE94X_REF_4V
// * AFE94X_EXT_REF
//Voltage 返回多通道ADC電壓值（mv）
void AFE94X_GetAllValue(uint8_t AFE94X_REF,uint8_t *Rxdata,float *Voltage)
{
uint8_t PGA_Gain[]={0X10,0X10,0X10,0X10,0X10,0X10,0X10,0X10};
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint32_t AD_Value=0;
//停止連續(xù)讀數據
AFE9XX_Command(AFE94X_SDATAC);
//PGA_Gain set 1,MUX Normal input
AFE9XX_WriteMultiReg(AFE94X_CH1SET,8,PGA_Gain);
//單次模式
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_SHOT_MODE);
//設置采樣率
AFE9XX_WriteReg(AFE94X_CONFIG1,0x06);
//設置內部基準
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF);
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
for(int i=0;i<8;i++)
{
AD_Value = (Rxdata[3+(i*3)]<<16|Rxdata[4+(i*3)]<<8|Rxdata[5+(i*3)]);
//MSB=1->采集數據為負數
if((AD_Value>>16)&0X80)
{
AD_Value = ~AD_Value;
AD_Value = AD_Value&0X7FFFFF;
}
//內部基準選擇2.4V
if(AFE94X_REF==AFE94X_REF_2_4V)
{
Voltage[i] = (AD_Value*(2.4/8388607))*1000;
}
//內部基準選擇4V
else if(AFE94X_REF==AFE94X_REF_4V)
{
Voltage[i] = (AD_Value*(4.0/8388607))*1000;
}
//外部基準
else if(AFE94X_REF==EXT_REF_EN)
{
//Voltage[i] = (AD_Value*(LSB)*1000;
}
}
}
//右腿驅動
void TEST_RLD_SINGLE(uint8_t *Rxdata)
{
uint8_t Txdata[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint32_t AD_Value=0;
//停止連續(xù)讀數據
AFE9XX_Command(AFE94X_SDATAC);
//channel 1-3 PGA_Gain set 1,MUX Normal input
AFE9XX_WriteReg(AFE94X_CH1SET,AFE94X_PGA_1|MUX_Normal_input);
AFE9XX_WriteReg(AFE94X_CH2SET,AFE94X_PGA_1|MUX_Normal_input);
AFE9XX_WriteReg(AFE94X_CH3SET,AFE94X_PGA_1|MUX_Normal_input);
//channel 1-3 connect RLD
AFE9XX_WriteReg(AFE94X_RLD_SENSP,0X07);
AFE9XX_WriteReg(AFE94X_RLD_SENSN,0X07);
AFE9XX_WriteReg(AFE94X_CONFIG3,0X1C);
//set channel 4-5
AFE9XX_WriteReg(AFE94X_CH4SET,AFE94X_CH_PD|AFE94X_PGA_1|MUX_RLD_DRN);
AFE9XX_WriteReg(AFE94X_CH5SET,AFE94X_CH_PD|AFE94X_PGA_1|MUX_RLD_Test);
//單次模式
AFE9XX_WriteReg(AFE94X_CONFIG4,AFE94X_SHOT_MODE);
//設置采樣率
AFE9XX_WriteReg(AFE94X_CONFIG1,0x06);
//設置內部基準
AFE9XX_WriteReg(AFE94X_CONFIG3,INT_REF_EN|AFE94X_REF_2_4V );
//啟動轉換
AFE9XX_Command(AFE94X_START);
//連續(xù)讀數據
AFE9XX_Command(AFE94X_RDATAC);
//等待DRDY
while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_12));
Lpspi_Read(27,Txdata,Rxdata);
}
到了這里，關于64kSPS、低功耗、多通道同步、24 位ADC生物電勢測量的模擬前端AFE9XX的文章就介紹完了。如果您還想了解更多內容，請在右上角搜索TOY模板網以前的文章或繼續(xù)瀏覽下面的相關文章，希望大家以后多多支持TOY模板網！
