芯片解密max30102心率传感制作。
芯片解密功能实现：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
- }
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芯片解密
