max30102心率传感制作。
功能实现：采用STM32F103C8T6小板（bluepill板），驱动血氧心率传感器HXDZ-30102或HXDZ-30102-ACC（MAX30102），实现PPG信号采集，并将计算的心率和血氧值显示在0.96寸OLED和串口上。
软件实现：ST标准库3.5
硬件连接：
HXDZ-30102:
VCC<->3.3V
GND<->GND
SCL<->PB7
SDA<->PB8
IM<->PB9
0.96inch OLED :
VCC<->3.3V
GND<->GND
SCL<->PA5
SDA<->PA6
RST<->PA3
DC<->PA4
CS<->PA2
USB-TTL:
5V<->5V
GND<->GND
RXD<->PA9
TXD<->PA10
单片机源程序如下:
- #include "led.h"
- #include "delay.h"
- #include "sys.h"
- #include "usart.h"
- #include "max30102.h"
- #include "myiic.h"
- #include "algorithm.h"
- #include "oled.h"
- uint32_t aun_ir_buffer[500]; //IR LED sensor data
- int32_t n_ir_buffer_length; //data length
- uint32_t aun_red_buffer[500]; //Red LED sensor data
- int32_t n_sp02; //SPO2 value
- int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid
- int32_t n_heart_rate; //heart rate value
- int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid
- uint8_t uch_dummy;
- #define MAX_BRIGHTNESS 255
- void dis_DrawCurve(u32* data,u8 x);
- int main(void)
- {
- //variables to calculate the on-board LED brightness that reflects the heartbeats
- uint32_t un_min, un_max, un_prev_data;
- int i;
- int32_t n_brightness;
- float f_temp;
- u8 temp_num=0;
- u8 temp[6];
- u8 str[100];
- u8 dis_hr=0,dis_spo2=0;
- NVIC_Configuration();
- delay_init(); //延时函数初始化
- uart_init(115200); //串口初始化为115200
- LED_Init();
-
- //OLED
- OLED_Init();
- OLED_ShowString(0,0," initializing ",16);
- OLED_Refresh_Gram();//更新显示到OLED
- max30102_init();
- printf("\r\n MAX30102 init \r\n");
- un_min=0x3FFFF;
- un_max=0;
-
- n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
- //read the first 500 samples, and determine the signal range
- for(i=0;i<n_ir_buffer_length;i++)
- {
- while(MAX30102_INT==1); //wait until the interrupt pin asserts
-
- max30102_FIFO_ReadBytes(REG_FIFO_DATA,temp);
- aun_red_buffer[i] = (long)((long)((long)temp[0]&0x03)<<16) | (long)temp[1]<<8 | (long)temp[2]; // Combine values to get the actual number
- aun_ir_buffer[i] = (long)((long)((long)temp[3] & 0x03)<<16) |(long)temp[4]<<8 | (long)temp[5]; // Combine values to get the actual number
-
- if(un_min>aun_red_buffer[i])
- un_min=aun_red_buffer[i]; //update signal min
- if(un_max<aun_red_buffer[i])
- un_max=aun_red_buffer[i]; //update signal max
- }
- un_prev_data=aun_red_buffer[i];
- //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
- maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
-
- while(1)
- {
- i=0;
- un_min=0x3FFFF;
- un_max=0;
-
- //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
- for(i=100;i<500;i++)
- {
- aun_red_buffer[i-100]=aun_red_buffer[i];
- aun_ir_buffer[i-100]=aun_ir_buffer[i];
-
- //update the signal min and max
- if(un_min>aun_red_buffer[i])
- un_min=aun_red_buffer[i];
- if(un_max<aun_red_buffer[i])
- un_max=aun_red_buffer[i];
- }
- //take 100 sets of samples before calculating the heart rate.
- for(i=400;i<500;i++)
- {
- un_prev_data=aun_red_buffer[i-1];
- while(MAX30102_INT==1);
- max30102_FIFO_ReadBytes(REG_FIFO_DATA,temp);
- aun_red_buffer[i] = (long)((long)((long)temp[0]&0x03)<<16) | (long)temp[1]<<8 | (long)temp[2]; // Combine values to get the actual number
- aun_ir_buffer[i] = (long)((long)((long)temp[3] & 0x03)<<16) |(long)temp[4]<<8 | (long)temp[5]; // Combine values to get the actual number
-
- if(aun_red_buffer[i]>un_prev_data)
- {
- f_temp=aun_red_buffer[i]-un_prev_data;
- f_temp/=(un_max-un_min);
- f_temp*=MAX_BRIGHTNESS;
- n_brightness-=(int)f_temp;
- if(n_brightness<0)
- n_brightness=0;
- }
- else
- {
- f_temp=un_prev_data-aun_red_buffer[i];
- f_temp/=(un_max-un_min);
- f_temp*=MAX_BRIGHTNESS;
- n_brightness+=(int)f_temp;
- if(n_brightness>MAX_BRIGHTNESS)
- n_brightness=MAX_BRIGHTNESS;
- }
- //send samples and calculation result to terminal program through UART
- if(ch_hr_valid == 1 && ch_spo2_valid ==1 && n_heart_rate<120 && n_sp02<101)
- {
- dis_hr = n_heart_rate;
- dis_spo2 = n_sp02;
- }
- else
- {
- dis_hr = 0;
- dis_spo2 = 0;
- }
- printf("HR=%i, ", n_heart_rate);
- printf("HRvalid=%i, ", ch_hr_valid);
- printf("SpO2=%i, ", n_sp02);
- printf("SPO2Valid=%i\r\n", ch_spo2_valid);
- }
- maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
-
- //显示刷新
- LED0=0;
- if(dis_hr == 0 && dis_spo2 == 0)
- {
- sprintf((char *)str,"HR:--- SpO2:--- ");
- }
- else{
- sprintf((char *)str,"HR:%3d SpO2:%3d ",dis_hr,dis_spo2);
- }
- OLED_ShowString(0,0,str,16);
- OLED_Fill(0,23,127,63,0);
- //红光在上，红外在下
- dis_DrawCurve(aun_red_buffer,20);
- dis_DrawCurve(aun_ir_buffer,0);
- OLED_Refresh_Gram();//更新显示到OLED
- }
- }
- void dis_DrawCurve(u32* data,u8 x)
- {
- u16 i;
- u32 max=0,min=262144;
- u32 temp;
- u32 compress;
-
- for(i=0;i<128*2;i++)
- {
- if(data[i]>max)
- {
- max = data[i];
- }
- if(data[i]<min)
- {
- min = data[i];
- }
- }
-
- compress = (max-min)/20;
-
- for(i=0;i<128;i++)
- {
- temp = data[i*2] + data[i*2+1];
- temp/=2;
- temp -= min;
- temp/=compress;
- if(temp>20)temp=20;
- OLED_DrawPoint(i,63-x-temp,1);
- }
- }
所有资料51hei提供下载:
MAX30102.rar
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