#include "max30102.h" #include "delay.h" /*****************辰哥单片机设计****************** STM32 * 文件 : MAX30102心率血氧传感器c文件 * 版本 : V1.0 * 日期 : 2024.8.18 * MCU : STM32F103C8T6 * 接口 : 见max30102.h文件 * BILIBILI : 辰哥单片机设计 * CSDN : 辰哥单片机设计 * 作者 : 辰哥 **********************BEGIN***********************/ u8 max30102_Bus_Write(u8 Register_Address, u8 Word_Data) { /* 采用串行EEPROM随即读取指令序列，连续读取若干字节 */ /* 第1步：发起I2C总线启动信号 */ MAX30102_IIC_Start(); /* 第2步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 */ /* 第3步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第4步：发送字节地址 */ MAX30102_IIC_Send_Byte(Register_Address); if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第5步：开始写入数据 */ MAX30102_IIC_Send_Byte(Word_Data); /* 第6步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); return 1; /* 执行成功 */ cmd_fail: /* 命令执行失败后，切记发送停止信号，避免影响I2C总线上其他设备 */ /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); return 0; } u8 max30102_Bus_Read(u8 Register_Address) { u8 data; /* 第1步：发起I2C总线启动信号 */ MAX30102_IIC_Start(); /* 第2步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 */ /* 第3步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第4步：发送字节地址， */ MAX30102_IIC_Send_Byte((uint8_t)Register_Address); if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第6步：重新启动I2C总线。下面开始读取数据 */ MAX30102_IIC_Start(); /* 第7步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_RD); /* 此处是读指令 */ /* 第8步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第9步：读取数据 */ { data = MAX30102_IIC_Read_Byte(0); /* 读1个字节 */ MAX30102_IIC_NAck(); /* 最后1个字节读完后，CPU产生NACK信号(驱动SDA = 1) */ } /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); return data; /* 执行成功 返回data值 */ cmd_fail: /* 命令执行失败后，切记发送停止信号，避免影响I2C总线上其他设备 */ /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); return 0; } void max30102_FIFO_ReadWords(u8 Register_Address,u16 Word_Data[][2],u8 count) { u8 i=0; u8 no = count; u8 data1, data2; /* 第1步：发起I2C总线启动信号 */ MAX30102_IIC_Start(); /* 第2步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 */ /* 第3步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第4步：发送字节地址， */ MAX30102_IIC_Send_Byte((uint8_t)Register_Address); if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第6步：重新启动I2C总线。下面开始读取数据 */ MAX30102_IIC_Start(); /* 第7步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_RD); /* 此处是读指令 */ /* 第8步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第9步：读取数据 */ while (no) { data1 = MAX30102_IIC_Read_Byte(0); MAX30102_IIC_Ack(); data2 = MAX30102_IIC_Read_Byte(0); MAX30102_IIC_Ack(); Word_Data[i][0] = (((u16)data1 << 8) | data2); // data1 = MAX30102_IIC_Read_Byte(0); MAX30102_IIC_Ack(); data2 = MAX30102_IIC_Read_Byte(0); if(1==no) MAX30102_IIC_NAck(); /* 最后1个字节读完后，CPU产生NACK信号(驱动SDA = 1) */ else MAX30102_IIC_Ack(); Word_Data[i][1] = (((u16)data1 << 8) | data2); no--; i++; } /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); cmd_fail: /* 命令执行失败后，切记发送停止信号，避免影响I2C总线上其他设备 */ /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); } void max30102_FIFO_ReadBytes(u8 Register_Address,u8* Data) { max30102_Bus_Read(REG_INTR_STATUS_1); max30102_Bus_Read(REG_INTR_STATUS_2); /* 第1步：发起I2C总线启动信号 */ MAX30102_IIC_Start(); /* 第2步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 */ /* 第3步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第4步：发送字节地址， */ MAX30102_IIC_Send_Byte((uint8_t)Register_Address); if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第6步：重新启动I2C总线。下面开始读取数据 */ MAX30102_IIC_Start(); /* 第7步：发起控制字节，高7bit是地址，bit0是读写控制位，0表示写，1表示读 */ MAX30102_IIC_Send_Byte(max30102_WR_address | I2C_RD); /* 此处是读指令 */ /* 第8步：发送ACK */ if (MAX30102_IIC_Wait_Ack() != 0) { goto cmd_fail; /* EEPROM器件无应答 */ } /* 第9步：读取数据 */ Data[0] = MAX30102_IIC_Read_Byte(1); Data[1] = MAX30102_IIC_Read_Byte(1); Data[2] = MAX30102_IIC_Read_Byte(1); Data[3] = MAX30102_IIC_Read_Byte(1); Data[4] = MAX30102_IIC_Read_Byte(1); Data[5] = MAX30102_IIC_Read_Byte(0); /* 最后1个字节读完后，CPU产生NACK信号(驱动SDA = 1) */ /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); cmd_fail: /* 命令执行失败后，切记发送停止信号，避免影响I2C总线上其他设备 */ /* 发送I2C总线停止信号 */ MAX30102_IIC_Stop(); // u8 i; // u8 fifo_wr_ptr; // u8 firo_rd_ptr; // u8 number_tp_read; // //Get the FIFO_WR_PTR // fifo_wr_ptr = max30102_Bus_Read(REG_FIFO_WR_PTR); // //Get the FIFO_RD_PTR // firo_rd_ptr = max30102_Bus_Read(REG_FIFO_RD_PTR); // // number_tp_read = fifo_wr_ptr - firo_rd_ptr; // // //for(i=0;i0){ // MAX30102_IIC_ReadBytes(max30102_WR_address,REG_FIFO_DATA,Data,6); // } //max30102_Bus_Write(REG_FIFO_RD_PTR,fifo_wr_ptr); } void MAX30102_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; GPIO_Init(GPIOB, &GPIO_InitStructure); MAX30102_IIC_Init(); MAX30102_Reset(); // max30102_Bus_Write(REG_MODE_CONFIG, 0x0b); //mode configuration : temp_en[3] MODE[2:0]=010 HR only enabled 011 SP02 enabled // max30102_Bus_Write(REG_INTR_STATUS_2, 0xF0); //open all of interrupt // max30102_Bus_Write(REG_INTR_STATUS_1, 0x00); //all interrupt clear // max30102_Bus_Write(REG_INTR_ENABLE_2, 0x02); //DIE_TEMP_RDY_EN // max30102_Bus_Write(REG_TEMP_CONFIG, 0x01); //SET TEMP_EN // max30102_Bus_Write(REG_SPO2_CONFIG, 0x47); //SPO2_SR[4:2]=001 100 per second LED_PW[1:0]=11 16BITS // max30102_Bus_Write(REG_LED1_PA, 0x47); // max30102_Bus_Write(REG_LED2_PA, 0x47); max30102_Bus_Write(REG_INTR_ENABLE_1,0xc0); // INTR setting max30102_Bus_Write(REG_INTR_ENABLE_2,0x00); max30102_Bus_Write(REG_FIFO_WR_PTR,0x00); //FIFO_WR_PTR[4:0] max30102_Bus_Write(REG_OVF_COUNTER,0x00); //OVF_COUNTER[4:0] max30102_Bus_Write(REG_FIFO_RD_PTR,0x00); //FIFO_RD_PTR[4:0] max30102_Bus_Write(REG_FIFO_CONFIG,0x0f); //sample avg = 1, fifo rollover=false, fifo almost full = 17 max30102_Bus_Write(REG_MODE_CONFIG,0x03); //0x02 for Red only, 0x03 for SpO2 mode 0x07 multimode LED max30102_Bus_Write(REG_SPO2_CONFIG,0x27); // SPO2_ADC range = 4096nA, SPO2 sample rate (100 Hz), LED pulseWidth (400uS) max30102_Bus_Write(REG_LED1_PA,0x24); //Choose value for ~ 7mA for LED1 max30102_Bus_Write(REG_LED2_PA,0x24); // Choose value for ~ 7mA for LED2 max30102_Bus_Write(REG_PILOT_PA,0x7f); // Choose value for ~ 25mA for Pilot LED } void MAX30102_Reset(void) { max30102_Bus_Write(REG_MODE_CONFIG,0x40); max30102_Bus_Write(REG_MODE_CONFIG,0x40); } void maxim_max30102_write_reg(uint8_t uch_addr, uint8_t uch_data) { // char ach_i2c_data[2]; // ach_i2c_data[0]=uch_addr; // ach_i2c_data[1]=uch_data; // // MAX30102_IIC_WriteBytes(I2C_WRITE_ADDR, ach_i2c_data, 2); MAX30102_IIC_Write_One_Byte(I2C_WRITE_ADDR,uch_addr,uch_data); } void maxim_max30102_read_reg(uint8_t uch_addr, uint8_t *puch_data) { // char ch_i2c_data; // ch_i2c_data=uch_addr; // MAX30102_IIC_WriteBytes(I2C_WRITE_ADDR, &ch_i2c_data, 1); // // i2c.read(I2C_READ_ADDR, &ch_i2c_data, 1); // // *puch_data=(uint8_t) ch_i2c_data; MAX30102_IIC_Read_One_Byte(I2C_WRITE_ADDR,uch_addr,puch_data); } void maxim_max30102_read_fifo(uint32_t *pun_red_led, uint32_t *pun_ir_led) { uint32_t un_temp; unsigned char uch_temp; char ach_i2c_data[6]; *pun_red_led=0; *pun_ir_led=0; //read and clear status register maxim_max30102_read_reg(REG_INTR_STATUS_1, &uch_temp); maxim_max30102_read_reg(REG_INTR_STATUS_2, &uch_temp); MAX30102_IIC_ReadBytes(I2C_WRITE_ADDR,REG_FIFO_DATA,(u8 *)ach_i2c_data,6); un_temp=(unsigned char) ach_i2c_data[0]; un_temp<<=16; *pun_red_led+=un_temp; un_temp=(unsigned char) ach_i2c_data[1]; un_temp<<=8; *pun_red_led+=un_temp; un_temp=(unsigned char) ach_i2c_data[2]; *pun_red_led+=un_temp; un_temp=(unsigned char) ach_i2c_data[3]; un_temp<<=16; *pun_ir_led+=un_temp; un_temp=(unsigned char) ach_i2c_data[4]; un_temp<<=8; *pun_ir_led+=un_temp; un_temp=(unsigned char) ach_i2c_data[5]; *pun_ir_led+=un_temp; *pun_red_led&=0x03FFFF; //Mask MSB [23:18] *pun_ir_led&=0x03FFFF; //Mask MSB [23:18] } //MAX30102引脚输出模式控制 void MAX30102_IIC_SDA_OUT(void)//SDA输出方向配置 { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin=MAX30102_IIC_SDA_PIN; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;//SDA推挽输出 GPIO_Init(MAX30102_IIC_PORT,&GPIO_InitStructure); } void MAX30102_IIC_SDA_IN(void)//SDA输入方向配置 { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin=MAX30102_IIC_SDA_PIN; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;//SCL上拉输入 GPIO_Init(MAX30102_IIC_PORT,&GPIO_InitStructure); } //初始化IIC void MAX30102_IIC_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; //RCC->APB2ENR|=1<<4;//先使能外设IO PORTC时钟 RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE ); GPIO_InitStructure.GPIO_Pin = MAX30102_IIC_SCL_PIN|MAX30102_IIC_SDA_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(MAX30102_IIC_PORT, &GPIO_InitStructure); MAX30102_IIC_SCL=1; MAX30102_IIC_SDA=1; } //产生IIC起始信号 void MAX30102_IIC_Start(void) { MAX30102_IIC_SDA_OUT(); //sda线输出 MAX30102_IIC_SDA=1; MAX30102_IIC_SCL=1; delay_us(4); MAX30102_IIC_SDA=0;//START:when CLK is high,DATA change form high to low delay_us(4); MAX30102_IIC_SCL=0;//钳住I2C总线，准备发送或接收数据 } //产生IIC停止信号 void MAX30102_IIC_Stop(void) { MAX30102_IIC_SDA_OUT();//sda线输出 MAX30102_IIC_SCL=0; MAX30102_IIC_SDA=0;//STOP:when CLK is high DATA change form low to high delay_us(4); MAX30102_IIC_SCL=1; MAX30102_IIC_SDA=1;//发送I2C总线结束信号 delay_us(4); } //等待应答信号到来 //返回值：1，接收应答失败 // 0，接收应答成功 u8 MAX30102_IIC_Wait_Ack(void) { u8 ucErrTime=0; MAX30102_IIC_SDA_IN(); //SDA设置为输入 MAX30102_IIC_SDA=1;delay_us(1); MAX30102_IIC_SCL=1;delay_us(1); while(MAX30102_READ_SDA) { ucErrTime++; if(ucErrTime>250) { MAX30102_IIC_Stop(); return 1; } } MAX30102_IIC_SCL=0;//时钟输出0 return 0; } //产生ACK应答 void MAX30102_IIC_Ack(void) { MAX30102_IIC_SCL=0; MAX30102_IIC_SDA_OUT(); MAX30102_IIC_SDA=0; delay_us(2); MAX30102_IIC_SCL=1; delay_us(2); MAX30102_IIC_SCL=0; } //不产生ACK应答 void MAX30102_IIC_NAck(void) { MAX30102_IIC_SCL=0; MAX30102_IIC_SDA_OUT(); MAX30102_IIC_SDA=1; delay_us(2); MAX30102_IIC_SCL=1; delay_us(2); MAX30102_IIC_SCL=0; } //IIC发送一个字节 //返回从机有无应答 //1，有应答 //0，无应答 void MAX30102_IIC_Send_Byte(u8 txd) { u8 t; MAX30102_IIC_SDA_OUT(); MAX30102_IIC_SCL=0;//拉低时钟开始数据传输 for(t=0;t<8;t++) { MAX30102_IIC_SDA=(txd&0x80)>>7; txd<<=1; delay_us(2); //对TEA5767这三个延时都是必须的 MAX30102_IIC_SCL=1; delay_us(2); MAX30102_IIC_SCL=0; delay_us(2); } } //读1个字节，ack=1时，发送ACK，ack=0，发送nACK u8 MAX30102_IIC_Read_Byte(unsigned char ack) { unsigned char i,receive=0; MAX30102_IIC_SDA_IN();//SDA设置为输入 for(i=0;i<8;i++ ) { MAX30102_IIC_SCL=0; delay_us(2); MAX30102_IIC_SCL=1; receive<<=1; if(MAX30102_READ_SDA)receive++; delay_us(1); } if (!ack) MAX30102_IIC_NAck();//发送nACK else MAX30102_IIC_Ack(); //发送ACK return receive; } void MAX30102_IIC_WriteBytes(u8 WriteAddr,u8* data,u8 dataLength) { u8 i; MAX30102_IIC_Start(); MAX30102_IIC_Send_Byte(WriteAddr); //发送写命令 MAX30102_IIC_Wait_Ack(); for(i=0;i0)? an_dx[k] : ((int32_t)0-an_dx[k])) ; } n_th1= n_th1/ ( BUFFER_SIZE-HAMMING_SIZE); // peak location is acutally index for sharpest location of raw signal since we flipped the signal maxim_find_peaks( an_dx_peak_locs, &n_npks, an_dx, BUFFER_SIZE-HAMMING_SIZE, n_th1, 8, 5 );//peak_height, peak_distance, max_num_peaks n_peak_interval_sum =0; if (n_npks>=2){ for (k=1; k0){ for(i= m-5;i0){ un_only_once =0; } n_c_min= an_x[i] ; an_exact_ir_valley_locs[k]=i; } if (un_only_once ==0) n_exact_ir_valley_locs_count ++ ; } } if (n_exact_ir_valley_locs_count <2 ){ *pn_spo2 = -999 ; // do not use SPO2 since signal ratio is out of range *pch_spo2_valid = 0; return; } // 4 pt MA for(k=0; k< BUFFER_SIZE-MA4_SIZE; k++){ an_x[k]=( an_x[k]+an_x[k+1]+ an_x[k+2]+ an_x[k+3])/(int32_t)4; an_y[k]=( an_y[k]+an_y[k+1]+ an_y[k+2]+ an_y[k+3])/(int32_t)4; } //using an_exact_ir_valley_locs , find ir-red DC andir-red AC for SPO2 calibration ratio //finding AC/DC maximum of raw ir * red between two valley locations n_ratio_average =0; n_i_ratio_count =0; for(k=0; k< 5; k++) an_ratio[k]=0; for (k=0; k< n_exact_ir_valley_locs_count; k++){ if (an_exact_ir_valley_locs[k] > BUFFER_SIZE ){ *pn_spo2 = -999 ; // do not use SPO2 since valley loc is out of range *pch_spo2_valid = 0; return; } } // find max between two valley locations // and use ratio betwen AC compoent of Ir & Red and DC compoent of Ir & Red for SPO2 for (k=0; k< n_exact_ir_valley_locs_count-1; k++){ n_y_dc_max= -16777216 ; n_x_dc_max= - 16777216; if (an_exact_ir_valley_locs[k+1]-an_exact_ir_valley_locs[k] >10){ for (i=an_exact_ir_valley_locs[k]; i< an_exact_ir_valley_locs[k+1]; i++){ if (an_x[i]> n_x_dc_max) {n_x_dc_max =an_x[i];n_x_dc_max_idx =i; } if (an_y[i]> n_y_dc_max) {n_y_dc_max =an_y[i];n_y_dc_max_idx=i;} } n_y_ac= (an_y[an_exact_ir_valley_locs[k+1]] - an_y[an_exact_ir_valley_locs[k] ] )*(n_y_dc_max_idx -an_exact_ir_valley_locs[k]); //red n_y_ac= an_y[an_exact_ir_valley_locs[k]] + n_y_ac/ (an_exact_ir_valley_locs[k+1] - an_exact_ir_valley_locs[k]) ; n_y_ac= an_y[n_y_dc_max_idx] - n_y_ac; // subracting linear DC compoenents from raw n_x_ac= (an_x[an_exact_ir_valley_locs[k+1]] - an_x[an_exact_ir_valley_locs[k] ] )*(n_x_dc_max_idx -an_exact_ir_valley_locs[k]); // ir n_x_ac= an_x[an_exact_ir_valley_locs[k]] + n_x_ac/ (an_exact_ir_valley_locs[k+1] - an_exact_ir_valley_locs[k]); n_x_ac= an_x[n_y_dc_max_idx] - n_x_ac; // subracting linear DC compoenents from raw n_nume=( n_y_ac *n_x_dc_max)>>7 ; //prepare X100 to preserve floating value n_denom= ( n_x_ac *n_y_dc_max)>>7; if (n_denom>0 && n_i_ratio_count <5 && n_nume != 0) { an_ratio[n_i_ratio_count]= (n_nume*20)/n_denom ; //formular is ( n_y_ac *n_x_dc_max) / ( n_x_ac *n_y_dc_max) ; ///*************************n_nume原来是*100************************// n_i_ratio_count++; } } } maxim_sort_ascend(an_ratio, n_i_ratio_count); n_middle_idx= n_i_ratio_count/2; if (n_middle_idx >1) n_ratio_average =( an_ratio[n_middle_idx-1] +an_ratio[n_middle_idx])/2; // use median else n_ratio_average = an_ratio[n_middle_idx ]; if( n_ratio_average>2 && n_ratio_average <184){ n_spo2_calc= uch_spo2_table[n_ratio_average] ; *pn_spo2 = n_spo2_calc ; *pch_spo2_valid = 1;// float_SPO2 = -45.060*n_ratio_average* n_ratio_average/10000 + 30.354 *n_ratio_average/100 + 94.845 ; // for comparison with table } else{ *pn_spo2 = -999 ; // do not use SPO2 since signal ratio is out of range *pch_spo2_valid = 0; } } void maxim_find_peaks(int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_size, int32_t n_min_height, int32_t n_min_distance, int32_t n_max_num) /** * \brief Find peaks * \par Details * Find at most MAX_NUM peaks above MIN_HEIGHT separated by at least MIN_DISTANCE * * \retval None */ { maxim_peaks_above_min_height( pn_locs, pn_npks, pn_x, n_size, n_min_height ); maxim_remove_close_peaks( pn_locs, pn_npks, pn_x, n_min_distance ); *pn_npks = min( *pn_npks, n_max_num ); } void maxim_peaks_above_min_height(int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_size, int32_t n_min_height) /** * \brief Find peaks above n_min_height * \par Details * Find all peaks above MIN_HEIGHT * * \retval None */ { int32_t i = 1, n_width; *pn_npks = 0; while (i < n_size-1){ if (pn_x[i] > n_min_height && pn_x[i] > pn_x[i-1]){ // find left edge of potential peaks n_width = 1; while (i+n_width < n_size && pn_x[i] == pn_x[i+n_width]) // find flat peaks n_width++; if (pn_x[i] > pn_x[i+n_width] && (*pn_npks) < 15 ){ // find right edge of peaks pn_locs[(*pn_npks)++] = i; // for flat peaks, peak location is left edge i += n_width+1; } else i += n_width; } else i++; } } void maxim_remove_close_peaks(int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_min_distance) /** * \brief Remove peaks * \par Details * Remove peaks separated by less than MIN_DISTANCE * * \retval None */ { int32_t i, j, n_old_npks, n_dist; /* Order peaks from large to small */ maxim_sort_indices_descend( pn_x, pn_locs, *pn_npks ); for ( i = -1; i < *pn_npks; i++ ){ n_old_npks = *pn_npks; *pn_npks = i+1; for ( j = i+1; j < n_old_npks; j++ ){ n_dist = pn_locs[j] - ( i == -1 ? -1 : pn_locs[i] ); // lag-zero peak of autocorr is at index -1 if ( n_dist > n_min_distance || n_dist < -n_min_distance ) pn_locs[(*pn_npks)++] = pn_locs[j]; } } // Resort indices longo ascending order maxim_sort_ascend( pn_locs, *pn_npks ); } void maxim_sort_ascend(int32_t *pn_x,int32_t n_size) /** * \brief Sort array * \par Details * Sort array in ascending order (insertion sort algorithm) * * \retval None */ { int32_t i, j, n_temp; for (i = 1; i < n_size; i++) { n_temp = pn_x[i]; for (j = i; j > 0 && n_temp < pn_x[j-1]; j--) pn_x[j] = pn_x[j-1]; pn_x[j] = n_temp; } } void maxim_sort_indices_descend(int32_t *pn_x, int32_t *pn_indx, int32_t n_size) /** * \brief Sort indices * \par Details * Sort indices according to descending order (insertion sort algorithm) * * \retval None */ { int32_t i, j, n_temp; for (i = 1; i < n_size; i++) { n_temp = pn_indx[i]; for (j = i; j > 0 && pn_x[n_temp] > pn_x[pn_indx[j-1]]; j--) pn_indx[j] = pn_indx[j-1]; pn_indx[j] = n_temp; } }