数值还是稳定的，但太贵了，stm32单片机的话，直接用这篇博客（https://qq742971636.blog.csdn.net/article/details/137359381）的代码，一样稳定。

解析这个模块的数据

char rev_max30102_bufferdata[30];
char rev_max30102_data_cnt = 0;
char rev_max30102_flag = 0;
char rev_max30102_timercnt = 0;
char rev_max30102_sucess = 0;
uint32_t max30102_value_heart = 0;
uint32_t max30102_value_spo2 = 0;
char trig_max30102 = 0;
char trig_max30102_suc_cnt = 0;
char trig_max30102_timer_cnt = 0;

void USART3_IRQHandler(void) {
    u8 res;
    if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) /* 接收到数据 */
    {
        res = USART_ReceiveData(USART3);
        if (rev_max30102_flag == 0) {
            rev_max30102_data_cnt = 0;
            rev_max30102_bufferdata[rev_max30102_data_cnt++] = res;
            rev_max30102_flag = 1;
        } else if (rev_max30102_flag == 1) {
            rev_max30102_bufferdata[rev_max30102_data_cnt++] = res;
            if (rev_max30102_data_cnt >= 30) {
                rev_max30102_data_cnt = 0;
            }
        }

    }
}

// 10ms
void TIM4_IRQHandler(void)                                    /* TIM4中断 */
{
    if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)  /* 检查TIM4更新中断发生与否 */
    {
        TIM_ClearITPendingBit(TIM4, TIM_IT_Update);   /* 清除TIM4更新中断标志 */

        //10ms一帧
        if (rev_max30102_flag == 1) {
            rev_max30102_timercnt++;
        }
        if (rev_max30102_timercnt >= 4) {
            rev_max30102_timercnt = 0;
            rev_max30102_flag = 0;
            //数据处理标志
            rev_max30102_sucess = 1;
        }

    }
}

 if (trig_max30102) {
            if (trig_max30102_suc_cnt == 0) {//心率测量
                trig_max30102_timer_cnt++;
                if (trig_max30102_timer_cnt == 2) {
                    USART3_SendString("AT+HEART\r\n");
                }
                if (trig_max30102_timer_cnt > 20) { //200ms发一次
                    trig_max30102_timer_cnt = 0;
                }

                if (rev_max30102_sucess == 1) {
                    rev_max30102_sucess = 0;
                    //收到的是"+HEART=75\r\nOK"
                    if ((rev_max30102_bufferdata[0] == '+') && (rev_max30102_bufferdata[1] == 'H') &&
                        (rev_max30102_bufferdata[2] == 'E') && (rev_max30102_bufferdata[3] == 'A') &&
                        (rev_max30102_bufferdata[4] == 'R') && (rev_max30102_bufferdata[5] == 'T')) {
                        if (rev_max30102_bufferdata[9] == '\r') {
                            rev_max30102_bufferdata[7] = rev_max30102_bufferdata[7] - '0';
                            rev_max30102_bufferdata[8] = rev_max30102_bufferdata[8] - '0';
                            max30102_value_heart = rev_max30102_bufferdata[7] * 10 + rev_max30102_bufferdata[8];
                            trig_max30102_suc_cnt = 1;//心率测完了
                        } else if (rev_max30102_bufferdata[10] == '\r') {
                            rev_max30102_bufferdata[7] = rev_max30102_bufferdata[7] - '0';
                            rev_max30102_bufferdata[8] = rev_max30102_bufferdata[8] - '0';
                            rev_max30102_bufferdata[9] = rev_max30102_bufferdata[9] - '0';
                            max30102_value_heart = rev_max30102_bufferdata[7] * 100 + rev_max30102_bufferdata[8] * 10 +
                                                   rev_max30102_bufferdata[9];
                            trig_max30102_suc_cnt = 1;//心率测完了
                        }
                    }
                }
            } else if (trig_max30102_suc_cnt == 1) {//测血氧
                trig_max30102_timer_cnt++;
                if (trig_max30102_timer_cnt == 2) {
                    USART3_SendString("AT+SPO2\r\n");
                }
                if (trig_max30102_timer_cnt > 20) { //200ms发一次
                    trig_max30102_timer_cnt = 0;
                }
                if (rev_max30102_sucess == 1) {
                    rev_max30102_sucess = 0;
                    //收到的是"+SPO2=75\r\nOK"
                    if ((rev_max30102_bufferdata[0] == '+') && (rev_max30102_bufferdata[1] == 'S') &&
                        (rev_max30102_bufferdata[2] == 'P') && (rev_max30102_bufferdata[3] == 'O') &&
                        (rev_max30102_bufferdata[4] == '2')) {
                        if (rev_max30102_bufferdata[8] == '\r') {
                            rev_max30102_bufferdata[6] = rev_max30102_bufferdata[6] - '0';
                            rev_max30102_bufferdata[7] = rev_max30102_bufferdata[7] - '0';
                            max30102_value_spo2 = rev_max30102_bufferdata[6] * 10 + rev_max30102_bufferdata[7];
                            trig_max30102_suc_cnt = 2;//血氧测完了
                            trig_max30102 = 0;
                        } else if (rev_max30102_bufferdata[9] == '\r') {
                            rev_max30102_bufferdata[6] = rev_max30102_bufferdata[6] - '0';
                            rev_max30102_bufferdata[7] = rev_max30102_bufferdata[7] - '0';
                            rev_max30102_bufferdata[8] = rev_max30102_bufferdata[8] - '0';
                            max30102_value_spo2 = rev_max30102_bufferdata[6] * 100 + rev_max30102_bufferdata[7] * 10 +
                                                  rev_max30102_bufferdata[8];
                            trig_max30102_suc_cnt = 2;//血氧测完了
                            trig_max30102 = 0;
                        }
                    }
                }
            }
        }

            //显示心率和血氧
            memset(disp, 0, 16);
            sprintf(disp, "HR%d SPO2%d", max30102_value_heart, max30102_value_spo2);
            OLED_P8x16Str(0, 4, disp, 0);

帮助、问询

https://docs.qq.com/sheet/DUEdqZ2lmbmR6UVdU?tab=BB08J2