单片机心率程序为什么没有数据啊？就大神解答一下 -

#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#define uint unsigned int
#define uchar unsigned char
// 定义心率引脚
sbit SCL = P3^3;
sbit SDA = P3^4;
sbit INT = P3^2;
// 定义MAX30102的I2C地址
#define MAX30102_ADDR 0xAE
// 定义 MAX30102 寄存器地址
#define REG_INTR_STATUS_1 0x00
#define REG_INTR_STATUS_2 0x01
#define REG_INTR_ENABLE_1 0x02
#define REG_INTR_ENABLE_2 0x03
#define REG_FIFO_WR_PTR 0x04
#define REG_OVF_COUNTER 0x05
#define REG_FIFO_RD_PTR 0x06
#define REG_FIFO_DATA 0x07
#define REG_FIFO_CONFIG 0x08
#define REG_MODE_CONFIG 0x09
#define REG_SPO2_CONFIG 0x0A
#define REG_LED1_PA 0x0C
#define REG_LED2_PA 0x0D
#define REG_PILOT_PA 0x10
#define REG_MULTI_LED_CTRL1 0x11
#define REG_MULTI_LED_CTRL2 0x12
#define REG_TEMP_INTR 0x1F
#define REG_TEMP_FRAC 0x20
#define REG_TEMP_CONFIG 0x21
#define REG_PROX_INT_THRESH 0x30
#define REG_REV_ID 0xFE
#define REG_PART_ID 0xFF
// 全局变量用于心率计算
unsigned int pulse_count = 0;
unsigned int prev_pulse_count = 0;
unsigned int heart_rate = 0;
uint count; // 计数
bit flag_1s = 0;
unsigned int one_second_count = 0;
// 微秒级延时函数
void delay(uint t) // @12T 1us
{
while (t--);
}
// I2C起始信号
void I2C_Start() {
SDA = 1;
SCL = 1;
delay(1);
SDA = 0;
delay(1);
SCL = 0;
}
// I2C停止信号
void I2C_Stop() {
SDA = 0;
SCL = 1;
delay(1);
SDA = 1;
delay(1);
}
// I2C发送一个字节
void I2C_SendByte(unsigned char dat) {
unsigned char i;
for (i = 0; i < 8; i++) {
SDA = (dat & 0x80) >> 7;
dat <<= 1;
SCL = 1;
delay(1);
SCL = 0;
delay(1);
}
}
// I2C接收一个字节
unsigned char I2C_ReceiveByte() {
unsigned char i, dat = 0;
SDA = 1;
for (i = 0; i < 8; i++) {
SCL = 1;
dat <<= 1;
if (SDA) dat |= 0x01;
SCL = 0;
delay(1);
}
return dat;
}
// I2C发送应答信号
void I2C_SendAck(bit ack) {
SDA = ack;
SCL = 1;
delay(1);
SCL = 0;
delay(1);
}
// I2C接收应答信号
bit I2C_ReceiveAck() {
bit ack;
SDA = 1;
SCL = 1;
ack = SDA;
SCL = 0;
delay(1);
return ack;
}
// 向MAX30102写一个字节数据
bit MAX30102_WriteByte(unsigned char reg, unsigned char dat) {
I2C_Start();
I2C_SendByte(MAX30102_ADDR & 0xFE); // 写地址
if (I2C_ReceiveAck()) {
I2C_Stop();
return 0;
}
I2C_SendByte(reg);
if (I2C_ReceiveAck()) {
I2C_Stop();
return 0;
}
I2C_SendByte(dat);
if (I2C_ReceiveAck()) {
I2C_Stop();
return 0;
}
I2C_Stop();
return 1;
}
// 从MAX30102读一个字节数据
bit MAX30102_ReadByte(unsigned char reg, unsigned char *dat) {
I2C_Start();
I2C_SendByte(MAX30102_ADDR & 0xFE); // 写地址
if (I2C_ReceiveAck()) {
I2C_Stop();
return 0;
}
I2C_SendByte(reg);
if (I2C_ReceiveAck()) {
I2C_Stop();
return 0;
}
I2C_Start();
I2C_SendByte(MAX30102_ADDR | 0x01); // 读地址
if (I2C_ReceiveAck()) {
I2C_Stop();
return 0;
}
*dat = I2C_ReceiveByte();
I2C_SendAck(1); // 非应答
I2C_Stop();
return 1;
}
// 初始化MAX30102
bit MAX30102_Init() {
unsigned char reg_val;
if (!MAX30102_WriteByte(REG_MODE_CONFIG, 0x40)) return 0; // 复位 MAX30102
do {
if (!MAX30102_ReadByte(REG_MODE_CONFIG, ®_val)) return 0;
} while (reg_val & 0x40);
if (!MAX30102_WriteByte(REG_FIFO_CONFIG, 0x00)) return 0; // 设置 FIFO 配置
if (!MAX30102_WriteByte(REG_MODE_CONFIG, 0x02)) return 0; // 设置模式配置为心率模式
if (!MAX30102_WriteByte(REG_SPO2_CONFIG, 0x27)) return 0; // 设置 SpO2 配置
if (!MAX30102_WriteByte(REG_LED1_PA, 0x2F)) return 0; // 设置 LED 强度
if (!MAX30102_WriteByte(REG_LED2_PA, 0x2F)) return 0;
return 1;
}
// 读取 FIFO 数据
bit MAX30102_ReadFIFO(unsigned long *data) {
unsigned char byte1, byte2, byte3;
if (!MAX30102_ReadByte(REG_FIFO_DATA, &byte1)) return 0;
if (!MAX30102_ReadByte(REG_FIFO_DATA, &byte2)) return 0;
if (!MAX30102_ReadByte(REG_FIFO_DATA, &byte3)) return 0;
*data = ((unsigned long)byte1 << 16) | ((unsigned long)byte2 << 8) | (unsigned long)byte3;
return 1;
}
// 简单的心率计算
int calculateHeartRate(unsigned long *data, int size) {
int peaks = 0;
int i;
for (i = 1; i < size - 1; i++) {
if (data[i] > data[i - 1] && data[i] > data[i + 1]) {
peaks++;
}
}
// 简单估算心率，假设采样率为 100Hz
int heartRate = peaks * 60 / (size / 100);
return heartRate;
}
// 定时器0初始化函数
void InitTimer0(void)
{
TMOD = 0x01;
TH0 = 0xFC;
TL0 = 0x18;
EA = 1;
ET0 = 1;
TR0 = 1;
}
// 外部中断 0 服务函数，用于检测心率脉冲
void External0_ISR() interrupt 0
{
static uint last_time = 0;
uint current_time = count;
if (current_time - last_time > 20) // 消抖处理，20ms
{
pulse_count++;
last_time = current_time;
}
}
// 定时器0中断服务函数
void Timer0Interrupt() interrupt 1
{
static uint i;
TH0 = 0xFC;
TL0 = 0x18;
count++;
i++;
one_second_count++;
if (one_second_count >= 1000) // 1秒
{
one_second_count = 0;
flag_1s = 1;
}
}
// 主程序
unsigned long fifoData[1000]; // 定义为全局变量以减小 main 函数自动段大小
void main()
{
int i;
// 初始化定时器0
InitTimer0();
// 初始化外部中断 0
IT0 = 1; // 下降沿触发
EX0 = 1; // 使能外部中断 0
EA = 1; // 使能全局中断
IE0 = 0; // INT0中断请求标志清0
// 初始化MAX30102
if (!MAX30102_Init()) {
while (1);
}
// 读取FIFO数据
for (i = 0; i < 1000; i++) {
if (!MAX30102_ReadFIFO(&fifoData[i])) {
while (1);
}
}
// 计算初始心率
heart_rate = calculateHeartRate(fifoData, 1000);
while (1)
{
if (flag_1s) // 1秒
{
flag_1s = 0;
heart_rate = pulse_count * 60; // 计算心率
pulse_count = 0; // 清零脉冲计数
}

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