\u79fb\u5f00\u624b\u6307，\u5c4f\u5e55\u7acb\u523b\u5207\u6362 FINGER \/ IR LOW \u63d0\u793a，IR \u6570\u503c\u5927\u5e45\u4e0b\u964d\u3002\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260815102526-6a803e96bdbde.jpg\")
<\/p>\n<\/li>\n
\u516b\u3001\u6e90\u4ee3\u7801\u6a21\u5757（\u53ef\u76f4\u63a5\u590d\u5236\u63d2\u5165\u533a\u57df）<\/h3>\n
\u672c\u8282\u9884\u7559\u5b8c\u6574\u6e90\u7801\u63d2\u5165\u4f4d\u7f6e，\u5de5\u7a0b\u5206\u4e3a 3 \u4e2a\u6838\u5fc3\u6587\u4ef6：MAX30102 \u5e95\u5c42\u9a71\u52a8\u3001OLED \u8f6f\u4ef6 I2C \u9a71\u52a8\u3001\u4e3b\u51fd\u6570\u903b\u8f91<\/p>\n
8.1 \u5de5\u7a0b\u6587\u4ef6\u7ed3\u6784<\/h4>\n
MAX30102.c \/\/ \u4f20\u611f\u5668\u5e95\u5c42\u8bfb\u5199\u3001FIFO\u8bfb\u53d6\u3001\u91c7\u6837\u7f13\u5b58\u7ef4\u62a4
\noled.c \/\/ \u72ec\u7acb\u8f6f\u4ef6I2C\u5c4f\u5e55\u9a71\u52a8
\nmain.c \/\/ \u4e3b\u5faa\u73af\u3001\u72b6\u6001\u5237\u65b0\u3001OLED\u6253\u5370\u663e\u793a
\nMAX30102\u7b97\u6cd5\u51fd\u6570 \/\/ \u53bb\u57fa\u7ebf\u3001\u5cf0\u503c\u68c0\u6d4b\u3001\u5fc3\u7387\u8840\u6c27\u8ba1\u7b97\u6a21\u5757<\/p>\n
main.c\u4ee3\u7801<\/h4>\n
\/* MAX30102 heart-rate\/SpO2 teaching demonstration for STM32F103C8T6. *\/
\n#include "delay.h"
\n#include "sys.h"
\n#include "oled.h"
\n#include "MAX30102.h"<\/p>\n
#define LOOP_DELAY_MS 10U
\n#define DISPLAY_LOOP_COUNT 20U<\/p>\n
static void MAX30102_ShowData(const MAX30102_DataTypeDef *data);
\nstatic void MAX30102_ShowError(void);<\/p>\n
int main(void)
\n{
\nMAX30102_DataTypeDef sensor = {0};
\nu8 display_count = 0U;
\nu8 sensor_ok;<\/p>\n
delay_init();
\nNVIC_Configuration();
\nOLED_Init();
\nOLED_ColorTurn(0);
\nOLED_DisplayTurn(0);
\nOLED_Clear();
\nOLED_ShowString(0, 0, (u8 *)"MAX30102 DEMO", 16);
\nOLED_ShowString(0, 24, (u8 *)"INITIALIZING…", 12);
\nOLED_Refresh();<\/p>\n
sensor_ok = MAX30102_Init();
\nif(sensor_ok == 0U)
\n{
\nMAX30102_ShowError();
\n}
\nelse
\n{
\nMAX30102_ShowData(&sensor);
\n}<\/p>\n
while(1)
\n{
\nif(sensor_ok != 0U)
\n{
\nif(MAX30102_Update(&sensor) == 0U)
\n{
\nsensor_ok = 0U;
\nMAX30102_ShowError();
\n}
\nelse
\n{
\ndisplay_count++;
\nif(display_count >= DISPLAY_LOOP_COUNT)
\n{
\ndisplay_count = 0U;
\nMAX30102_ShowData(&sensor);
\n}
\n}
\n}
\ndelay_ms(LOOP_DELAY_MS);
\n}
\n}<\/p>\n
static void MAX30102_ShowData(const MAX30102_DataTypeDef *data)
\n{
\nOLED_Clear();
\nif(data->fifo_active != 0U)
\n{
\nOLED_ShowString(0, 0, (u8 *)"IR:", 12);
\nOLED_ShowNum(18, 0, data->ir, 6, 12);
\n}
\nelse
\n{
\nOLED_ShowString(0, 0, (u8 *)"W:", 12);
\nOLED_ShowNum(12, 0, data->fifo_write_pointer, 2, 12);
\nOLED_ShowString(30, 0, (u8 *)"R:", 12);
\nOLED_ShowNum(42, 0, data->fifo_read_pointer, 2, 12);
\nOLED_ShowString(60, 0, (u8 *)"S:", 12);
\nOLED_ShowNum(72, 0, data->interrupt_status, 3, 12);
\n}
\nOLED_ShowString(0, 14, (u8 *)"HR:", 16);
\nif(data->heart_rate_valid != 0U)
\n{
\nOLED_ShowNum(32, 14, data->heart_rate, 3, 16);
\n}
\nelse
\n{
\nOLED_ShowString(32, 14, (u8 *)"—", 16);
\n}
\nOLED_ShowString(64, 14, (u8 *)"BPM", 16);<\/p>\n
OLED_ShowString(0, 32, (u8 *)"SpO2:", 16);
\nif(data->spo2_valid != 0U)
\n{
\nOLED_ShowNum(48, 32, data->spo2, 3, 16);
\n}
\nelse
\n{
\nOLED_ShowString(48, 32, (u8 *)"—", 16);
\n}
\nOLED_ShowString(80, 32, (u8 *)"%", 16);<\/p>\n
if(data->fifo_active == 0U)
\n{
\nOLED_ShowString(0, 52, (u8 *)"WAIT FIFO DATA", 12);
\n}
\nelse if(data->finger_detected == 0U)
\n{
\nOLED_ShowString(0, 52, (u8 *)"FINGER \/ IR LOW", 12);
\n}
\nelse if(data->progress < 100U)
\n{
\nOLED_ShowString(0, 52, (u8 *)"SAMPLING", 12);
\nOLED_ShowNum(60, 52, data->progress, 3, 12);
\nOLED_ShowString(78, 52, (u8 *)"%", 12);
\n}
\nelse if((data->heart_rate_valid == 0U) || (data->spo2_valid == 0U))
\n{
\nOLED_ShowString(0, 52, (u8 *)"KEEP FINGER STILL", 12);
\n}
\nelse
\n{
\nOLED_ShowString(0, 52, (u8 *)"MEASUREMENT OK", 12);
\n}
\nOLED_Refresh();
\n}<\/p>\n
static void MAX30102_ShowError(void)
\n{
\nu8 error;<\/p>\n
error = MAX30102_GetLastError();
\nOLED_Clear();
\nOLED_ShowString(0, 0, (u8 *)"MAX30102 ERROR", 16);
\nif(error == MAX30102_ERROR_I2C)
\n{
\nOLED_ShowString(0, 20, (u8 *)"I2C NO ACK", 12);
\n}
\nelse if(error == MAX30102_ERROR_PART_ID)
\n{
\nOLED_ShowString(0, 20, (u8 *)"PART ID:", 12);
\nOLED_ShowNum(54, 20, MAX30102_GetPartID(), 3, 12);
\n}
\nelse if(error == MAX30102_ERROR_RESET)
\n{
\nOLED_ShowString(0, 20, (u8 *)"RESET FAILED", 12);
\n}
\nelse if(error == MAX30102_ERROR_CONFIG)
\n{
\nOLED_ShowString(0, 20, (u8 *)"CONFIG FAILED", 12);
\n}
\nelse
\n{
\nOLED_ShowString(0, 20, (u8 *)"FIFO I2C ERROR", 12);
\n}
\nOLED_ShowString(0, 36, (u8 *)"SCL:PB6 SDA:PB7", 12);
\nif(error == MAX30102_ERROR_PART_ID)
\n{
\nOLED_ShowString(0, 52, (u8 *)"EXPECT:021 (0x15)", 12);
\n}
\nelse
\n{
\nOLED_ShowString(0, 52, (u8 *)"CHECK I2C PULL-UP", 12);
\n}
\nOLED_Refresh();
\n}<\/p>\n
MAX30102.c\u4ee3\u7801<\/h4>\n
#include "MAX30102.h"
\n#include "delay.h"<\/p>\n
\/**
\n * @file MAX30102.c
\n * @brief MAX30102 \u8f6f\u4ef6 I2C\u3001FIFO \u91c7\u6837\u53ca\u5fc3\u7387\u8840\u6c27\u8ba1\u7b97\u5b9e\u73b0\u3002
\n * @note \u6587\u4ef6\u7f16\u7801\u4e3a UTF-8；\u6d4b\u91cf\u7ed3\u679c\u4ec5\u7528\u4e8e\u6559\u5b66\u6f14\u793a，\u4e0d\u7528\u4e8e\u533b\u7597\u8bca\u65ad\u3002
\n *\/<\/p>\n
\/* MAX30102 \u7684 7 \u4f4d I2C \u5730\u5740\u4e3a 0x57，\u53d1\u9001\u65f6\u9700\u8981\u5de6\u79fb\u4e00\u4f4d\u3002 *\/
\n#define MAX30102_ADDR_WRITE 0xAEU
\n#define MAX30102_ADDR_READ 0xAFU<\/p>\n
\/* MAX30102 \u5bc4\u5b58\u5668\u5730\u5740\u8868\u3002 *\/
\n#define REG_INTR_STATUS_1 0x00U
\n#define REG_INTR_STATUS_2 0x01U
\n#define REG_INTR_ENABLE_1 0x02U
\n#define REG_INTR_ENABLE_2 0x03U
\n#define REG_FIFO_WR_PTR 0x04U
\n#define REG_OVF_COUNTER 0x05U
\n#define REG_FIFO_RD_PTR 0x06U
\n#define REG_FIFO_DATA 0x07U
\n#define REG_FIFO_CONFIG 0x08U
\n#define REG_MODE_CONFIG 0x09U
\n#define REG_SPO2_CONFIG 0x0AU
\n#define REG_LED1_PA 0x0CU
\n#define REG_LED2_PA 0x0DU
\n#define REG_PILOT_PA 0x10U
\n#define REG_REV_ID 0xFEU
\n#define REG_PART_ID 0xFFU<\/p>\n
#define MAX30102_FIFO_DEPTH 32U \/* \u786c\u4ef6 FIFO \u53ef\u4fdd\u5b58\u7684\u6837\u672c\u7ec4\u6570 *\/
\n#define MAX30102_WINDOW_SAMPLES 400U \/* \u7b97\u6cd5\u7a97\u53e3：100 Hz \u4e0b\u7ea6 4 \u79d2 *\/
\n#define MAX30102_WINDOW_STEP 100U \/* \u6bcf\u6536\u5230 100 \u4e2a\u65b0\u6837\u672c\u91cd\u65b0\u8ba1\u7b97 *\/
\n#define MAX30102_FINGER_IR_MIN 5000UL \/* \u5224\u65ad\u624b\u6307\u5b58\u5728\u7684\u6700\u4f4e\u7ea2\u5916\u539f\u59cb\u503c *\/
\n#define MAX30102_FINGER_LOST 20U \/* \u8fde\u7eed\u4f4e\u4fe1\u53f7\u8fbe\u5230\u6b64\u503c\u624d\u5224\u5b9a\u624b\u6307\u79bb\u5f00 *\/
\n#define MAX30102_MIN_AC_LEVEL 80UL \/* \u6709\u6548\u8109\u640f\u4ea4\u6d41\u5206\u91cf\u7684\u6700\u4f4e\u5e45\u5ea6 *\/
\n#define MAX30102_MIN_PEAK_GAP 30U \/* \u76f8\u90bb\u8109\u640f\u5cf0\u6700\u5c0f\u95f4\u9694，\u5bf9\u5e94\u6700\u9ad8\u7ea6 200 BPM *\/
\n#define MAX30102_MAX_PEAKS 16U \/* \u5355\u4e2a\u7b97\u6cd5\u7a97\u53e3\u5141\u8bb8\u4fdd\u5b58\u7684\u6700\u5927\u5cf0\u503c\u6570\u91cf *\/<\/p>\n
#define MAX30102_SCL_HIGH() GPIO_SetBits(GPIOB, MAX30102_I2C_SCL_PIN)
\n#define MAX30102_SCL_LOW() GPIO_ResetBits(GPIOB, MAX30102_I2C_SCL_PIN)
\n#define MAX30102_SDA_HIGH() GPIO_SetBits(GPIOB, MAX30102_I2C_SDA_PIN)
\n#define MAX30102_SDA_LOW() GPIO_ResetBits(GPIOB, MAX30102_I2C_SDA_PIN)
\n#define MAX30102_SDA_READ() GPIO_ReadInputDataBit(GPIOB, MAX30102_I2C_SDA_PIN)<\/p>\n
\/* \u5fc3\u7387\u8840\u6c27\u7b97\u6cd5\u4f7f\u7528\u7684\u6ed1\u52a8\u91c7\u6837\u7a97\u53e3\u53ca\u8fd0\u884c\u72b6\u6001\u3002 *\/
\nstatic u32 max30102_red_buffer[MAX30102_WINDOW_SAMPLES];
\nstatic u32 max30102_ir_buffer[MAX30102_WINDOW_SAMPLES];
\nstatic s32 max30102_filtered[MAX30102_WINDOW_SAMPLES];
\nstatic u16 max30102_sample_count;
\nstatic u8 max30102_no_finger_count;
\nstatic u8 max30102_measurement_ready;
\nstatic u8 max30102_last_error;
\nstatic u8 max30102_part_id;<\/p>\n
\/* \u9a71\u52a8\u5185\u90e8\u51fd\u6570\u58f0\u660e\u3002 *\/
\nstatic void MAX30102_I2C_Delay(void);
\nstatic void MAX30102_SDA_Output(void);
\nstatic void MAX30102_SDA_Input(void);
\nstatic void MAX30102_I2C_Start(void);
\nstatic void MAX30102_I2C_Stop(void);
\nstatic u8 MAX30102_I2C_WriteByte(u8 value);
\nstatic u8 MAX30102_I2C_ReadByte(u8 acknowledge);
\nstatic void MAX30102_I2C_BusRecovery(void);
\nstatic u8 MAX30102_ReadBytes(u8 reg, u8 *buffer, u8 length);
\nstatic void MAX30102_ClearResult(MAX30102_DataTypeDef *data);
\nstatic void MAX30102_ResetMeasurement(MAX30102_DataTypeDef *data);
\nstatic void MAX30102_AddSample(u32 red, u32 ir, MAX30102_DataTypeDef *data);
\nstatic void MAX30102_Calculate(MAX30102_DataTypeDef *data);
\nstatic u32 MAX30102_IntegerSqrt(uint64_t value);<\/p>\n
\/** @brief \u8f6f\u4ef6 I2C \u534a\u5468\u671f\u5ef6\u65f6\u3002 *\/
\nstatic void MAX30102_I2C_Delay(void)
\n{
\ndelay_us(4);
\n}<\/p>\n
\/*
\n * \u6bcf\u6b21\u53d1\u9001\u3001\u5e94\u7b54\u548c\u8bfb\u53d6\u65f6\u90fd\u663e\u5f0f\u5207\u6362 SDA \u65b9\u5411\u3002
\n * \u8f93\u5165\u4e0a\u62c9\u6a21\u5f0f\u53ef\u5728\u6a21\u5757\u4e0a\u62c9\u7535\u963b\u8f83\u5f31\u65f6\u4fdd\u6301 SDA \u7535\u5e73\u7a33\u5b9a\u3002
\n *\/
\nstatic void MAX30102_SDA_Output(void)
\n{
\nGPIO_InitTypeDef gpio;<\/p>\n
gpio.GPIO_Pin = MAX30102_I2C_SDA_PIN;
\ngpio.GPIO_Speed = GPIO_Speed_50MHz;
\ngpio.GPIO_Mode = GPIO_Mode_Out_OD;
\nGPIO_Init(GPIOB, &gpio);
\n}<\/p>\n
static void MAX30102_SDA_Input(void)
\n{
\nGPIO_InitTypeDef gpio;<\/p>\n
GPIO_SetBits(GPIOB, MAX30102_I2C_SDA_PIN);
\ngpio.GPIO_Pin = MAX30102_I2C_SDA_PIN;
\ngpio.GPIO_Speed = GPIO_Speed_50MHz;
\ngpio.GPIO_Mode = GPIO_Mode_IPU;
\nGPIO_Init(GPIOB, &gpio);
\n}<\/p>\n
\/** @brief \u4ea7\u751f I2C \u8d77\u59cb\u4fe1\u53f7：SCL \u4e3a\u9ad8\u7535\u5e73\u65f6 SDA \u7531\u9ad8\u53d8\u4f4e\u3002 *\/
\nstatic void MAX30102_I2C_Start(void)
\n{
\nMAX30102_SDA_Output();
\nMAX30102_SDA_HIGH();
\nMAX30102_SCL_HIGH();
\nMAX30102_I2C_Delay();
\nMAX30102_SDA_LOW();
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_LOW();
\n}<\/p>\n
\/** @brief \u4ea7\u751f I2C \u505c\u6b62\u4fe1\u53f7：SCL \u4e3a\u9ad8\u7535\u5e73\u65f6 SDA \u7531\u4f4e\u53d8\u9ad8\u3002 *\/
\nstatic void MAX30102_I2C_Stop(void)
\n{
\nMAX30102_SDA_Output();
\nMAX30102_SCL_LOW();
\nMAX30102_SDA_LOW();
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_HIGH();
\nMAX30102_I2C_Delay();
\nMAX30102_SDA_HIGH();
\nMAX30102_I2C_Delay();
\n}<\/p>\n
\/**
\n * @brief \u901a\u8fc7\u8f6f\u4ef6 I2C \u53d1\u9001\u4e00\u4e2a\u5b57\u8282\u5e76\u7b49\u5f85\u4ece\u673a\u5e94\u7b54\u3002
\n * @return \u6536\u5230\u5e94\u7b54\u8fd4\u56de 1，\u7b49\u5f85\u5e94\u7b54\u8d85\u65f6\u8fd4\u56de 0\u3002
\n *\/
\nstatic u8 MAX30102_I2C_WriteByte(u8 value)
\n{
\nu8 i;
\nu16 timeout;<\/p>\n
MAX30102_SDA_Output();
\nMAX30102_SCL_LOW();
\nfor(i = 0U; i < 8U; i++)
\n{
\nMAX30102_SCL_LOW();
\nif((value & 0x80U) != 0U)
\n{
\nMAX30102_SDA_HIGH();
\n}
\nelse
\n{
\nMAX30102_SDA_LOW();
\n}
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_HIGH();
\nMAX30102_I2C_Delay();
\nvalue <<= 1;
\n}<\/p>\n
MAX30102_SCL_LOW();
\nMAX30102_SDA_Input();
\nMAX30102_SDA_HIGH();
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_HIGH();
\nMAX30102_I2C_Delay();<\/p>\n
timeout = 200U;
\nwhile((MAX30102_SDA_READ() != Bit_RESET) && (timeout > 0U))
\n{
\ntimeout–;
\ndelay_us(1);
\n}
\nMAX30102_SCL_LOW();
\nMAX30102_SDA_Output();
\nreturn (timeout > 0U) ? 1U : 0U;
\n}<\/p>\n
\/**
\n * @brief \u901a\u8fc7\u8f6f\u4ef6 I2C \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u3002
\n * @param acknowledge \u975e 0 \u8868\u793a\u8bfb\u5b8c\u540e\u53d1\u9001 ACK，0 \u8868\u793a\u53d1\u9001 NACK\u3002
\n *\/
\nstatic u8 MAX30102_I2C_ReadByte(u8 acknowledge)
\n{
\nu8 i;
\nu8 value = 0U;<\/p>\n
MAX30102_SDA_Input();
\nMAX30102_SDA_HIGH();
\nfor(i = 0U; i < 8U; i++)
\n{
\nMAX30102_SCL_LOW();
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_HIGH();
\nvalue <<= 1;
\nif(MAX30102_SDA_READ() != Bit_RESET)
\n{
\nvalue |= 0x01U;
\n}
\nMAX30102_I2C_Delay();
\n}<\/p>\n
MAX30102_SCL_LOW();
\nMAX30102_SDA_Output();
\nif(acknowledge != 0U)
\n{
\nMAX30102_SDA_LOW();
\n}
\nelse
\n{
\nMAX30102_SDA_HIGH();
\n}
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_HIGH();
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_LOW();
\nMAX30102_SDA_HIGH();
\nreturn value;
\n}<\/p>\n
\/** @brief \u8f93\u51fa 9 \u4e2a\u65f6\u949f\u5e76\u53d1\u9001\u505c\u6b62\u4fe1\u53f7，\u7528\u4e8e\u91ca\u653e\u5f02\u5e38\u5360\u7528\u7684 I2C \u603b\u7ebf\u3002 *\/
\nstatic void MAX30102_I2C_BusRecovery(void)
\n{
\nu8 i;<\/p>\n
MAX30102_SDA_Output();
\nMAX30102_SDA_HIGH();
\nfor(i = 0U; i < 9U; i++)
\n{
\nMAX30102_SCL_LOW();
\nMAX30102_I2C_Delay();
\nMAX30102_SCL_HIGH();
\nMAX30102_I2C_Delay();
\n}
\nMAX30102_I2C_Stop();
\n}<\/p>\n
\/** @brief \u5411\u6307\u5b9a\u5bc4\u5b58\u5668\u5199\u5165\u4e00\u4e2a\u5b57\u8282\u3002 *\/
\nu8 MAX30102_WriteRegister(u8 reg, u8 value)
\n{
\nMAX30102_I2C_Start();
\nif((MAX30102_I2C_WriteByte(MAX30102_ADDR_WRITE) == 0U) ||
\n (MAX30102_I2C_WriteByte(reg) == 0U) ||
\n (MAX30102_I2C_WriteByte(value) == 0U))
\n{
\nMAX30102_I2C_Stop();
\nreturn 0U;
\n}
\nMAX30102_I2C_Stop();
\nreturn 1U;
\n}<\/p>\n
\/** @brief \u4ece\u6307\u5b9a\u5bc4\u5b58\u5668\u5f00\u59cb\u8fde\u7eed\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\u3002 *\/
\nstatic u8 MAX30102_ReadBytes(u8 reg, u8 *buffer, u8 length)
\n{
\nu8 i;<\/p>\n
if((buffer == 0) || (length == 0U))
\n{
\nreturn 0U;
\n}<\/p>\n
MAX30102_I2C_Start();
\nif((MAX30102_I2C_WriteByte(MAX30102_ADDR_WRITE) == 0U) ||
\n (MAX30102_I2C_WriteByte(reg) == 0U))
\n{
\nMAX30102_I2C_Stop();
\nreturn 0U;
\n}<\/p>\n
MAX30102_I2C_Start();
\nif(MAX30102_I2C_WriteByte(MAX30102_ADDR_READ) == 0U)
\n{
\nMAX30102_I2C_Stop();
\nreturn 0U;
\n}<\/p>\n
for(i = 0U; i < length; i++)
\n{
\nbuffer[i] = MAX30102_I2C_ReadByte((i + 1U < length) ? 1U : 0U);
\n}
\nMAX30102_I2C_Stop();
\nreturn 1U;
\n}<\/p>\n
\/** @brief \u4ece\u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u3002 *\/
\nu8 MAX30102_ReadRegister(u8 reg, u8 *value)
\n{
\nreturn MAX30102_ReadBytes(reg, value, 1U);
\n}<\/p>\n
\/** @brief \u4ece FIFO \u8bfb\u53d6\u7ea2\u5149\u548c\u7ea2\u5916\u5149\u5404\u4e00\u4e2a 18 \u4f4d\u539f\u59cb\u6837\u672c\u3002 *\/
\nu8 MAX30102_ReadFIFO(u32 *red, u32 *ir)
\n{
\nu8 raw[6];<\/p>\n
if((red == 0) || (ir == 0))
\n{
\nreturn 0U;
\n}
\nif(MAX30102_ReadBytes(REG_FIFO_DATA, raw, 6U) == 0U)
\n{
\nreturn 0U;
\n}<\/p>\n
*red = (((u32)raw[0] << 16) | ((u32)raw[1] << 8) | raw[2]) & 0x03FFFFUL;
\n*ir = (((u32)raw[3] << 16) | ((u32)raw[4] << 8) | raw[5]) & 0x03FFFFUL;
\nreturn 1U;
\n}<\/p>\n
\/**
\n * @brief \u521d\u59cb\u5316 MAX30102\u3002
\n * @details
\n * \u4f9d\u6b21\u5b8c\u6210 GPIO \u914d\u7f6e\u3001I2C \u603b\u7ebf\u6062\u590d\u3001\u82af\u7247\u578b\u53f7\u68c0\u6d4b\u3001\u8f6f\u4ef6\u590d\u4f4d\u3001
\n * FIFO \u6e05\u7a7a\u4ee5\u53ca SpO2 \u6a21\u5f0f\u914d\u7f6e\u3002\u4efb\u4e00\u6b65\u9aa4\u5931\u8d25\u90fd\u4f1a\u8bb0\u5f55\u5bf9\u5e94\u9519\u8bef\u7801\u3002
\n *\/
\nu8 MAX30102_Init(void)
\n{
\nGPIO_InitTypeDef gpio;
\nu8 value;
\nu8 timeout;
\nu8 attempt;<\/p>\n
max30102_last_error = MAX30102_ERROR_NONE;
\nmax30102_part_id = 0U;
\nRCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
\nGPIO_SetBits(GPIOB, MAX30102_I2C_SCL_PIN | MAX30102_I2C_SDA_PIN);
\ngpio.GPIO_Pin = MAX30102_I2C_SCL_PIN | MAX30102_I2C_SDA_PIN;
\ngpio.GPIO_Speed = GPIO_Speed_50MHz;
\ngpio.GPIO_Mode = GPIO_Mode_Out_OD;
\nGPIO_Init(GPIOB, &gpio);
\nMAX30102_SCL_HIGH();
\nMAX30102_SDA_HIGH();
\ndelay_ms(10);
\nMAX30102_I2C_BusRecovery();<\/p>\n
for(attempt = 0U; attempt < 3U; attempt++)
\n{
\nif(MAX30102_ReadRegister(REG_PART_ID, &value) != 0U)
\n{
\nbreak;
\n}
\nMAX30102_I2C_BusRecovery();
\ndelay_ms(2);
\n}
\nif(attempt >= 3U)
\n{
\nmax30102_last_error = MAX30102_ERROR_I2C;
\nreturn 0U;
\n}
\nmax30102_part_id = value;
\nif(value != MAX30102_EXPECTED_PART_ID)
\n{
\nmax30102_last_error = MAX30102_ERROR_PART_ID;
\nreturn 0U;
\n}<\/p>\n
if(MAX30102_WriteRegister(REG_MODE_CONFIG, 0x40U) == 0U)
\n{
\nmax30102_last_error = MAX30102_ERROR_RESET;
\nreturn 0U;
\n}
\ntimeout = 100U;
\ndo
\n{
\ndelay_ms(1);
\nif(MAX30102_ReadRegister(REG_MODE_CONFIG, &value) == 0U)
\n{
\nmax30102_last_error = MAX30102_ERROR_RESET;
\nreturn 0U;
\n}
\ntimeout–;
\n} while(((value & 0x40U) != 0U) && (timeout > 0U));
\nif((value & 0x40U) != 0U)
\n{
\nmax30102_last_error = MAX30102_ERROR_RESET;
\nreturn 0U;
\n}<\/p>\n
\/* \u6309\u5df2\u9a8c\u8bc1\u7684\u4e94\u9488\u6a21\u5757\u9a71\u52a8\u987a\u5e8f\u914d\u7f6e\u5de5\u4f5c\u5bc4\u5b58\u5668\u3002 *\/
\nif((MAX30102_WriteRegister(REG_INTR_ENABLE_1, 0x40U) == 0U) ||
\n (MAX30102_WriteRegister(REG_INTR_ENABLE_2, 0x00U) == 0U) ||
\n (MAX30102_WriteRegister(REG_FIFO_WR_PTR, 0x00U) == 0U) ||
\n (MAX30102_WriteRegister(REG_OVF_COUNTER, 0x00U) == 0U) ||
\n (MAX30102_WriteRegister(REG_FIFO_RD_PTR, 0x00U) == 0U) ||
\n (MAX30102_WriteRegister(REG_FIFO_CONFIG, 0x0FU) == 0U) ||
\n (MAX30102_WriteRegister(REG_MODE_CONFIG, 0x03U) == 0U) ||
\n (MAX30102_WriteRegister(REG_SPO2_CONFIG, 0x27U) == 0U) ||
\n (MAX30102_WriteRegister(REG_LED1_PA, 0x24U) == 0U) ||
\n (MAX30102_WriteRegister(REG_LED2_PA, 0x24U) == 0U) ||
\n (MAX30102_WriteRegister(REG_PILOT_PA, 0x7FU) == 0U))
\n{
\nmax30102_last_error = MAX30102_ERROR_CONFIG;
\nreturn 0U;
\n}
\ndelay_ms(10);
\nif((MAX30102_ReadRegister(REG_MODE_CONFIG, &value) == 0U) ||
\n ((value & 0x07U) != 0x03U))
\n{
\nmax30102_last_error = MAX30102_ERROR_CONFIG;
\nreturn 0U;
\n}<\/p>\n
\/* \u8bfb\u53d6\u4e24\u4e2a\u72b6\u6001\u5bc4\u5b58\u5668，\u6e05\u9664\u4e0a\u7535\u6216\u914d\u7f6e\u8fc7\u7a0b\u4e2d\u9057\u7559\u7684\u4e2d\u65ad\u6807\u5fd7\u3002 *\/
\nif((MAX30102_ReadRegister(REG_INTR_STATUS_1, &value) == 0U) ||
\n (MAX30102_ReadRegister(REG_INTR_STATUS_2, &value) == 0U))
\n{
\nmax30102_last_error = MAX30102_ERROR_CONFIG;
\nreturn 0U;
\n}
\nmax30102_sample_count = 0U;
\nmax30102_no_finger_count = 0U;
\nmax30102_measurement_ready = 0U;
\nmax30102_last_error = MAX30102_ERROR_NONE;
\nreturn 1U;
\n}<\/p>\n
\/** @brief \u8fd4\u56de\u6700\u8fd1\u4e00\u6b21\u521d\u59cb\u5316\u6216 FIFO \u901a\u4fe1\u9519\u8bef\u7801\u3002 *\/
\nu8 MAX30102_GetLastError(void)
\n{
\nreturn max30102_last_error;
\n}<\/p>\n
\/** @brief \u8fd4\u56de\u521d\u59cb\u5316\u9636\u6bb5\u8bfb\u53d6\u5230\u7684\u82af\u7247\u578b\u53f7\u6807\u8bc6\u3002 *\/
\nu8 MAX30102_GetPartID(void)
\n{
\nreturn max30102_part_id;
\n}<\/p>\n
\/** @brief \u6e05\u9664\u5fc3\u7387\u3001\u8840\u6c27\u6570\u503c\u53ca\u5176\u6709\u6548\u6807\u5fd7\u3002 *\/
\nstatic void MAX30102_ClearResult(MAX30102_DataTypeDef *data)
\n{
\ndata->heart_rate = 0U;
\ndata->spo2 = 0U;
\ndata->heart_rate_valid = 0U;
\ndata->spo2_valid = 0U;
\n}<\/p>\n
\/** @brief \u6e05\u7a7a\u5f53\u524d\u91c7\u6837\u8fdb\u5ea6，\u5728\u624b\u6307\u79bb\u5f00\u6216 FIFO \u5f02\u5e38\u540e\u91cd\u65b0\u6d4b\u91cf\u3002 *\/
\nstatic void MAX30102_ResetMeasurement(MAX30102_DataTypeDef *data)
\n{
\nmax30102_sample_count = 0U;
\nmax30102_measurement_ready = 0U;
\ndata->progress = 0U;
\ndata->finger_detected = 0U;
\nMAX30102_ClearResult(data);
\n}<\/p>\n
\/**
\n * @brief \u8ba1\u7b97 64 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u7684\u5e73\u65b9\u6839\u3002
\n * @note \u4f7f\u7528\u9010\u4f4d\u7b97\u6cd5，\u907f\u514d\u5728 Cortex-M3 \u4e0a\u5f15\u5165\u6d6e\u70b9\u8fd0\u7b97\u5e93\u3002
\n *\/
\nstatic u32 MAX30102_IntegerSqrt(uint64_t value)
\n{
\nuint64_t bit;
\nuint64_t result;<\/p>\n
result = 0U;
\nbit = ((uint64_t)1U << 62);
\nwhile(bit > value)
\n{
\nbit >>= 2;
\n}
\nwhile(bit != 0U)
\n{
\nif(value >= result + bit)
\n{
\nvalue -= result + bit;
\nresult = (result >> 1) + bit;
\n}
\nelse
\n{
\nresult >>= 1;
\n}
\nbit >>= 2;
\n}
\nreturn (u32)result;
\n}<\/p>\n
\/**
\n * @brief \u6839\u636e 4 \u79d2\u7ea2\u5149\u548c\u7ea2\u5916\u5149\u91c7\u6837\u7a97\u53e3\u8ba1\u7b97\u5fc3\u7387\u4e0e\u8840\u6c27\u3002
\n * @details
\n * \u8840\u6c27\u4f7f\u7528\u7ea2\u5149\/\u7ea2\u5916\u5149\u4ea4\u6d41\u5206\u91cf\u4e0e\u76f4\u6d41\u5206\u91cf\u7684\u6bd4\u503c\u4f30\u7b97；\u5fc3\u7387\u5148\u53bb\u9664
\n * \u7f13\u6162\u53d8\u5316\u7684\u76f4\u6d41\u57fa\u7ebf，\u518d\u68c0\u6d4b\u6709\u6548\u8109\u640f\u5cf0\u5e76\u6839\u636e\u5e73\u5747\u5cf0\u95f4\u8ddd\u6362\u7b97 BPM\u3002
\n *\/
\nstatic void MAX30102_Calculate(MAX30102_DataTypeDef *data)
\n{
\nu16 i;
\nu16 start;
\nu16 end;
\nu16 peak_count;
\nu16 peak_locations[MAX30102_MAX_PEAKS];
\nu32 ir_sum;
\nu32 red_sum;
\nu32 ir_mean;
\nu32 red_mean;
\nu32 ir_ac;
\nu32 red_ac;
\nu32 interval_sum;
\nu32 average_interval;
\nu32 valid_interval_sum;
\nu16 valid_intervals;
\ns32 baseline;
\ns32 difference;
\ns32 positive_peak;
\ns32 negative_peak;
\ns32 threshold;
\ns32 polarity;
\nuint64_t ir_square_sum;
\nuint64_t red_square_sum;
\nuint64_t denominator;
\nuint64_t ratio_x100;
\ns32 spo2_x100;<\/p>\n
ir_sum = 0U;
\nred_sum = 0U;
\nMAX30102_ClearResult(data);
\nfor(i = 0U; i < MAX30102_WINDOW_SAMPLES; i++)
\n{
\nir_sum += max30102_ir_buffer[i];
\nred_sum += max30102_red_buffer[i];
\n}
\nir_mean = ir_sum \/ MAX30102_WINDOW_SAMPLES;
\nred_mean = red_sum \/ MAX30102_WINDOW_SAMPLES;
\nif((ir_mean < MAX30102_FINGER_IR_MIN) || (red_mean == 0U))
\n{
\nMAX30102_ClearResult(data);
\nreturn;
\n}<\/p>\n
\/* \u901a\u8fc7\u7ea2\u5149\u548c\u7ea2\u5916\u5149\u7684\u4ea4\u6d41\/\u76f4\u6d41\u53cc\u6bd4\u503c\u4f30\u7b97\u6559\u5b66\u7528\u8840\u6c27\u503c\u3002 *\/
\nir_square_sum = 0U;
\nred_square_sum = 0U;
\nfor(i = 0U; i < MAX30102_WINDOW_SAMPLES; i++)
\n{
\ndifference = (s32)max30102_ir_buffer[i] – (s32)ir_mean;
\nir_square_sum += (uint64_t)((int64_t)difference * difference);
\ndifference = (s32)max30102_red_buffer[i] – (s32)red_mean;
\nred_square_sum += (uint64_t)((int64_t)difference * difference);
\n}
\nir_ac = MAX30102_IntegerSqrt(ir_square_sum \/ MAX30102_WINDOW_SAMPLES);
\nred_ac = MAX30102_IntegerSqrt(red_square_sum \/ MAX30102_WINDOW_SAMPLES);
\nif((ir_ac >= MAX30102_MIN_AC_LEVEL) && (red_ac >= MAX30102_MIN_AC_LEVEL))
\n{
\ndenominator = (uint64_t)ir_ac * red_mean;
\nratio_x100 = ((uint64_t)red_ac * ir_mean * 100U + denominator \/ 2U) \/
\n denominator;
\nif((ratio_x100 >= 30U) && (ratio_x100 <= 170U))
\n{
\nspo2_x100 = 9485L;
\nspo2_x100 += (s32)((30354ULL * ratio_x100 + 500ULL) \/ 1000ULL);
\nspo2_x100 -= (s32)((4506ULL * ratio_x100 * ratio_x100 + 5000ULL) \/ 10000ULL);
\nif(spo2_x100 > 10000L)
\n{
\nspo2_x100 = 10000L;
\n}
\nif(spo2_x100 >= 7000L)
\n{
\ndata->spo2 = (u16)((spo2_x100 + 50L) \/ 100L);
\ndata->spo2_valid = 1U;
\n}
\n}
\n}<\/p>\n
\/* \u53bb\u9664\u7f13\u6162\u53d8\u5316\u7684\u76f4\u6d41\u57fa\u7ebf，\u518d\u5728\u4ea4\u6d41\u6ce2\u5f62\u4e2d\u5bfb\u627e\u8109\u640f\u5cf0\u3002 *\/
\nbaseline = (s32)max30102_ir_buffer[0];
\npositive_peak = 0;
\nnegative_peak = 0;
\nfor(i = 0U; i < MAX30102_WINDOW_SAMPLES; i++)
\n{
\nbaseline += ((s32)max30102_ir_buffer[i] – baseline) \/ 16;
\nmax30102_filtered[i] = (s32)max30102_ir_buffer[i] – baseline;
\nif(max30102_filtered[i] > positive_peak)
\n{
\npositive_peak = max30102_filtered[i];
\n}
\nif(max30102_filtered[i] < negative_peak)
\n{
\nnegative_peak = max30102_filtered[i];
\n}
\n}
\npolarity = (positive_peak >= -negative_peak) ? 1 : -1;
\nthreshold = ((polarity > 0) ? positive_peak : -negative_peak) * 35L \/ 100L;
\nif(threshold < (s32)MAX30102_MIN_AC_LEVEL)
\n{
\ndata->heart_rate_valid = 0U;
\nreturn;
\n}<\/p>\n
peak_count = 0U;
\nfor(i = 2U; i < (MAX30102_WINDOW_SAMPLES – 2U); i++)
\n{
\ns32 current;
\ns32 previous;
\ns32 next;<\/p>\n
current = max30102_filtered[i] * polarity;
\nprevious = max30102_filtered[i – 1U] * polarity;
\nnext = max30102_filtered[i + 1U] * polarity;
\nif((current >= threshold) && (current >= previous) && (current > next))
\n{
\nif(peak_count == 0U)
\n{
\npeak_locations[peak_count++] = i;
\n}
\nelse if((i – peak_locations[peak_count – 1U]) < MAX30102_MIN_PEAK_GAP)
\n{
\nif(current > max30102_filtered[peak_locations[peak_count – 1U]] * polarity)
\n{
\npeak_locations[peak_count – 1U] = i;
\n}
\n}
\nelse if(peak_count < MAX30102_MAX_PEAKS)
\n{
\npeak_locations[peak_count++] = i;
\n}
\n}
\n}<\/p>\n
if(peak_count < 3U)
\n{
\ndata->heart_rate_valid = 0U;
\nreturn;
\n}
\ninterval_sum = 0U;
\nfor(i = 1U; i < peak_count; i++)
\n{
\ninterval_sum += peak_locations[i] – peak_locations[i – 1U];
\n}
\naverage_interval = interval_sum \/ (peak_count – 1U);<\/p>\n
\/* \u5254\u9664\u4e0e\u5e73\u5747\u5cf0\u95f4\u8ddd\u504f\u5dee\u8fc7\u5927\u7684\u8fd0\u52a8\u4f2a\u5cf0\u3002 *\/
\nvalid_interval_sum = 0U;
\nvalid_intervals = 0U;
\nstart = (u16)(average_interval * 60U \/ 100U);
\nend = (u16)(average_interval * 140U \/ 100U);
\nfor(i = 1U; i < peak_count; i++)
\n{
\nu16 interval;
\ninterval = peak_locations[i] – peak_locations[i – 1U];
\nif((interval >= start) && (interval <= end))
\n{
\nvalid_interval_sum += interval;
\nvalid_intervals++;
\n}
\n}
\nif(valid_intervals >= 2U)
\n{
\naverage_interval = valid_interval_sum \/ valid_intervals;
\nif(average_interval != 0U)
\n{
\ndata->heart_rate = (u16)((MAX30102_SAMPLE_RATE_HZ * 60U +
\n average_interval \/ 2U) \/ average_interval);
\nif((data->heart_rate >= 30U) && (data->heart_rate <= 200U))
\n{
\ndata->heart_rate_valid = 1U;
\n}
\n}
\n}
\n}<\/p>\n
\/**
\n * @brief \u5904\u7406\u4e00\u7ec4\u65b0\u6837\u672c\u5e76\u52a0\u5165\u7b97\u6cd5\u7a97\u53e3\u3002
\n * @details \u7ea2\u5916\u503c\u8fc7\u4f4e\u65f6\u7d2f\u8ba1\u624b\u6307\u4e22\u5931\u6b21\u6570；\u7a97\u53e3\u586b\u6ee1\u540e\u6bcf\u65b0\u589e 100 \u4e2a\u6837\u672c
\n * \u91cd\u65b0\u8ba1\u7b97\u4e00\u6b21，\u5e76\u4fdd\u7559\u6700\u8fd1 3 \u79d2\u6570\u636e\u5f62\u6210\u6ed1\u52a8\u7a97\u53e3\u3002
\n *\/
\nstatic void MAX30102_AddSample(u32 red, u32 ir, MAX30102_DataTypeDef *data)
\n{
\nu16 i;<\/p>\n
data->red = red;
\ndata->ir = ir;
\ndata->sample_ready = 1U;
\ndata->fifo_active = 1U;
\nif(ir < MAX30102_FINGER_IR_MIN)
\n{
\nif(max30102_no_finger_count < MAX30102_FINGER_LOST)
\n{
\nmax30102_no_finger_count++;
\n}
\nif(max30102_no_finger_count >= MAX30102_FINGER_LOST)
\n{
\nMAX30102_ResetMeasurement(data);
\n}
\nreturn;
\n}<\/p>\n
max30102_no_finger_count = 0U;
\ndata->finger_detected = 1U;
\nif(max30102_sample_count < MAX30102_WINDOW_SAMPLES)
\n{
\nmax30102_red_buffer[max30102_sample_count] = red;
\nmax30102_ir_buffer[max30102_sample_count] = ir;
\nmax30102_sample_count++;
\n}
\nif(max30102_measurement_ready != 0U)
\n{
\ndata->progress = 100U;
\n}
\nelse
\n{
\ndata->progress = (u8)(((u32)max30102_sample_count * 100U) \/
\n MAX30102_WINDOW_SAMPLES);
\n}<\/p>\n
if(max30102_sample_count >= MAX30102_WINDOW_SAMPLES)
\n{
\nMAX30102_Calculate(data);
\nmax30102_measurement_ready = 1U;
\nfor(i = 0U; i < (MAX30102_WINDOW_SAMPLES – MAX30102_WINDOW_STEP); i++)
\n{
\nmax30102_red_buffer[i] = max30102_red_buffer[i + MAX30102_WINDOW_STEP];
\nmax30102_ir_buffer[i] = max30102_ir_buffer[i + MAX30102_WINDOW_STEP];
\n}
\nmax30102_sample_count = MAX30102_WINDOW_SAMPLES – MAX30102_WINDOW_STEP;
\ndata->progress = 100U;
\n}
\n}<\/p>\n
\/**
\n * @brief \u8f6e\u8be2\u4e2d\u65ad\u72b6\u6001\u548c FIFO \u6307\u9488，\u8bfb\u53d6\u5f53\u524d\u5168\u90e8\u53ef\u7528\u6837\u672c\u3002
\n * @details \u540c\u65f6\u5229\u7528 PPG_RDY \u72b6\u6001\u4f4d\u89e3\u51b3 FIFO \u6ee1\u65f6\u8bfb\u5199\u6307\u9488\u76f8\u7b49\u7684\u6b67\u4e49\u3002
\n *\/
\nu8 MAX30102_Update(MAX30102_DataTypeDef *data)
\n{
\nu8 interrupt_status;
\nu8 write_pointer;
\nu8 read_pointer;
\nu8 overflow;
\nu8 available;
\nu8 i;
\nu32 red;
\nu32 ir;<\/p>\n
if(data == 0)
\n{
\nreturn 0U;
\n}
\ndata->sample_ready = 0U;
\nif((MAX30102_ReadRegister(REG_INTR_STATUS_1, &interrupt_status) == 0U) ||
\n (MAX30102_ReadRegister(REG_FIFO_WR_PTR, &write_pointer) == 0U) ||
\n (MAX30102_ReadRegister(REG_OVF_COUNTER, &overflow) == 0U) ||
\n (MAX30102_ReadRegister(REG_FIFO_RD_PTR, &read_pointer) == 0U))
\n{
\nmax30102_last_error = MAX30102_ERROR_FIFO;
\nreturn 0U;
\n}
\nwrite_pointer &= 0x1FU;
\nread_pointer &= 0x1FU;
\ndata->interrupt_status = interrupt_status;
\ndata->fifo_write_pointer = write_pointer;
\ndata->fifo_read_pointer = read_pointer;<\/p>\n
available = (write_pointer – read_pointer) & (MAX30102_FIFO_DEPTH – 1U);
\nif((overflow & 0x1FU) != 0U)
\n{
\n\/* \u53d1\u751f\u6ea2\u51fa\u540e\u6307\u9488\u76f8\u7b49\u8868\u793a FIFO \u5df2\u6ee1，\u800c\u4e0d\u662f FIFO \u4e3a\u7a7a\u3002 *\/
\nif(available == 0U)
\n{
\navailable = MAX30102_FIFO_DEPTH;
\n}
\n}
\nelse if((available == 0U) && ((interrupt_status & 0x40U) != 0U))
\n{
\n\/* PPG_RDY \u7f6e\u4f4d\u65f6\u81f3\u5c11\u6709\u4e00\u4e2a\u65b0\u6837\u672c，\u53ef\u6d88\u9664\u6307\u9488\u76f8\u7b49\u7684\u6b67\u4e49\u3002 *\/
\navailable = 1U;
\n}
\nfor(i = 0U; i < available; i++)
\n{
\nif(MAX30102_ReadFIFO(&red, &ir) == 0U)
\n{
\nmax30102_last_error = MAX30102_ERROR_FIFO;
\nreturn 0U;
\n}
\nMAX30102_AddSample(red, ir, data);
\n}
\nif((overflow & 0x1FU) != 0U)
\n{
\nif(MAX30102_WriteRegister(REG_OVF_COUNTER, 0U) == 0U)
\n{
\nmax30102_last_error = MAX30102_ERROR_FIFO;
\nreturn 0U;
\n}
\n}
\nmax30102_last_error = MAX30102_ERROR_NONE;
\nreturn 1U;
\n}<\/p>\n
MAX30102.h\u4ee3\u7801<\/h4>\n
#ifndef __MAX30102_H
\n#define __MAX30102_H<\/p>\n
#include "sys.h"<\/p>\n
\/**
\n * @file MAX30102.h
\n * @brief MAX30102 \u5fc3\u7387\u8840\u6c27\u4f20\u611f\u5668\u9a71\u52a8\u63a5\u53e3\u3002
\n * @note \u6587\u4ef6\u7f16\u7801\u4e3a UTF-8，\u9002\u7528\u4e8e STM32F103C8T6 \u6559\u5b66\u6f14\u793a\u5de5\u7a0b\u3002
\n *\/<\/p>\n
\/*
\n * MAX30102 \u63a5\u7ebf：
\n * SCL -> PB6
\n * SDA -> PB7
\n *
\n * PB6\/PB7 \u7ec4\u6210 MAX30102 \u72ec\u7acb\u8f6f\u4ef6 I2C \u603b\u7ebf；OLED \u4f7f\u7528 PB8\/PB9，
\n * \u4e24\u6761\u603b\u7ebf\u76f8\u4e92\u72ec\u7acb，\u5237\u65b0 OLED \u65f6\u4e0d\u4f1a\u6539\u53d8\u4f20\u611f\u5668\u7684\u603b\u7ebf\u72b6\u6001\u3002
\n *\/
\n#define MAX30102_I2C_SCL_PIN GPIO_Pin_6
\n#define MAX30102_I2C_SDA_PIN GPIO_Pin_7
\n#define MAX30102_EXPECTED_PART_ID 0x15U \/* MAX30102 \u82af\u7247\u578b\u53f7\u6807\u8bc6 *\/
\n#define MAX30102_SAMPLE_RATE_HZ 100U \/* \u91c7\u6837\u7387：100 \u4e2a\u6837\u672c\/\u79d2 *\/<\/p>\n
\/* \u9a71\u52a8\u9519\u8bef\u7801，\u53ef\u901a\u8fc7 MAX30102_GetLastError() \u8bfb\u53d6\u3002 *\/
\n#define MAX30102_ERROR_NONE 0U \/* \u65e0\u9519\u8bef *\/
\n#define MAX30102_ERROR_I2C 1U \/* I2C \u5730\u5740\u9636\u6bb5\u672a\u6536\u5230\u5e94\u7b54 *\/
\n#define MAX30102_ERROR_PART_ID 2U \/* \u82af\u7247\u578b\u53f7\u6807\u8bc6\u4e0d\u662f 0x15 *\/
\n#define MAX30102_ERROR_RESET 3U \/* \u82af\u7247\u590d\u4f4d\u5931\u8d25\u6216\u8d85\u65f6 *\/
\n#define MAX30102_ERROR_CONFIG 4U \/* \u5de5\u4f5c\u5bc4\u5b58\u5668\u914d\u7f6e\u5931\u8d25 *\/
\n#define MAX30102_ERROR_FIFO 5U \/* FIFO \u8f6e\u8be2\u6216\u8bfb\u53d6\u5931\u8d25 *\/<\/p>\n
\/** MAX30102 \u6d4b\u91cf\u6570\u636e\u53ca\u8fd0\u884c\u72b6\u6001\u3002 *\/
\ntypedef struct
\n{
\nu16 heart_rate; \/* \u5fc3\u7387，\u5355\u4f4d：\u6b21\/\u5206\u949f（BPM） *\/
\nu16 spo2; \/* \u8840\u6c27\u9971\u548c\u5ea6，\u5355\u4f4d：\u767e\u5206\u6bd4（%） *\/
\nu8 heart_rate_valid; \/* \u5fc3\u7387\u6709\u6548\u6807\u5fd7：1 \u6709\u6548，0 \u65e0\u6548 *\/
\nu8 spo2_valid; \/* \u8840\u6c27\u6709\u6548\u6807\u5fd7：1 \u6709\u6548，0 \u65e0\u6548 *\/
\nu8 finger_detected; \/* \u624b\u6307\u68c0\u6d4b\u6807\u5fd7：1 \u5df2\u68c0\u6d4b\u5230，0 \u672a\u68c0\u6d4b\u5230 *\/
\nu8 sample_ready; \/* \u672c\u6b21\u66f4\u65b0\u81f3\u5c11\u8bfb\u53d6\u5230\u4e00\u4e2a\u65b0\u6837\u672c\u65f6\u7f6e 1 *\/
\nu8 fifo_active; \/* \u6210\u529f\u8bfb\u53d6\u8fc7 FIFO \u6837\u672c\u540e\u4fdd\u6301\u4e3a 1 *\/
\nu8 progress; \/* \u9996\u6b21\u6d4b\u91cf\u91c7\u96c6\u8fdb\u5ea6，\u8303\u56f4 0～100 *\/
\nu8 fifo_write_pointer; \/* FIFO \u5199\u6307\u9488，\u7528\u4e8e\u901a\u4fe1\u72b6\u6001\u8bca\u65ad *\/
\nu8 fifo_read_pointer; \/* FIFO \u8bfb\u6307\u9488，\u7528\u4e8e\u901a\u4fe1\u72b6\u6001\u8bca\u65ad *\/
\nu8 interrupt_status; \/* \u4e2d\u65ad\u72b6\u6001\u5bc4\u5b58\u5668 1 \u7684\u6700\u8fd1\u8bfb\u53d6\u503c *\/
\nu32 red; \/* \u6700\u8fd1\u4e00\u6b21\u7ea2\u5149\u539f\u59cb\u91c7\u6837\u503c，18 \u4f4d\u6709\u6548 *\/
\nu32 ir; \/* \u6700\u8fd1\u4e00\u6b21\u7ea2\u5916\u5149\u539f\u59cb\u91c7\u6837\u503c，18 \u4f4d\u6709\u6548 *\/
\n} MAX30102_DataTypeDef;<\/p>\n
\/**
\n * @brief \u521d\u59cb\u5316 GPIO\u3001\u8f6f\u4ef6 I2C \u548c MAX30102 \u5de5\u4f5c\u5bc4\u5b58\u5668\u3002
\n * @return \u521d\u59cb\u5316\u6210\u529f\u8fd4\u56de 1，\u5931\u8d25\u8fd4\u56de 0\u3002
\n *\/
\nu8 MAX30102_Init(void);<\/p>\n
\/**
\n * @brief \u8f6e\u8be2 FIFO\u3001\u8bfb\u53d6\u65b0\u6837\u672c\u5e76\u66f4\u65b0\u5fc3\u7387\u548c\u8840\u6c27\u8ba1\u7b97\u7ed3\u679c\u3002
\n * @param data \u7528\u4e8e\u4fdd\u5b58\u6d4b\u91cf\u7ed3\u679c\u548c\u8fd0\u884c\u72b6\u6001\u7684\u7ed3\u6784\u4f53\u5730\u5740\u3002
\n * @return \u901a\u4fe1\u6b63\u5e38\u8fd4\u56de 1，I2C \u6216 FIFO \u64cd\u4f5c\u5931\u8d25\u8fd4\u56de 0\u3002
\n *\/
\nu8 MAX30102_Update(MAX30102_DataTypeDef *data);<\/p>\n
\/** @brief \u8bfb\u53d6\u6700\u8fd1\u4e00\u6b21\u9a71\u52a8\u9519\u8bef\u7801\u3002 *\/
\nu8 MAX30102_GetLastError(void);<\/p>\n
\/** @brief \u8bfb\u53d6\u521d\u59cb\u5316\u9636\u6bb5\u68c0\u6d4b\u5230\u7684\u82af\u7247\u578b\u53f7\u6807\u8bc6\u3002 *\/
\nu8 MAX30102_GetPartID(void);<\/p>\n
\/* \u4ee5\u4e0b\u5e95\u5c42\u63a5\u53e3\u53ef\u7528\u4e8e\u8bfe\u5802\u4e0a\u7684\u5bc4\u5b58\u5668\u8bfb\u5199\u548c\u539f\u59cb\u6570\u636e\u5b9e\u9a8c\u3002 *\/<\/p>\n
\/**
\n * @brief \u5411 MAX30102 \u6307\u5b9a\u5bc4\u5b58\u5668\u5199\u5165\u4e00\u4e2a\u5b57\u8282\u3002
\n * @return \u5199\u5165\u6210\u529f\u8fd4\u56de 1，\u901a\u4fe1\u5931\u8d25\u8fd4\u56de 0\u3002
\n *\/
\nu8 MAX30102_WriteRegister(u8 reg, u8 value);<\/p>\n
\/**
\n * @brief \u4ece MAX30102 \u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u3002
\n * @return \u8bfb\u53d6\u6210\u529f\u8fd4\u56de 1，\u901a\u4fe1\u5931\u8d25\u8fd4\u56de 0\u3002
\n *\/
\nu8 MAX30102_ReadRegister(u8 reg, u8 *value);<\/p>\n
\/**
\n * @brief \u4ece FIFO \u8bfb\u53d6\u4e00\u7ec4\u7ea2\u5149\u548c\u7ea2\u5916\u5149\u539f\u59cb\u6837\u672c\u3002
\n * @return \u8bfb\u53d6\u6210\u529f\u8fd4\u56de 1，\u901a\u4fe1\u5931\u8d25\u8fd4\u56de 0\u3002
\n *\/
\nu8 MAX30102_ReadFIFO(u32 *red, u32 *ir);<\/p>\n
#endif<\/p>\n
8.2 \u5404\u6587\u4ef6\u6838\u5fc3\u51fd\u6570\u529f\u80fd\u8bf4\u660e<\/h4>\n
![](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260815102526-6a803e962a257.png\")
https:\/\/www.bilibili.com\/video\/BV11Vbk6vE3Y\/?share_source=copy_web&vd_source=91b967b41a17a5686913521545a8c3fb<\/span><\/span><\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260815102526-6a803e967a36b.png\")
<\/p>\n<\/li>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260815102526-6a803e96949cb.jpg\")
<\/p>\n