void four_uCh2uLong(u8 *in, u32 *out) { int i = 0; *out = 0; for (i = 0; i < 4; i++) *out = ((u32)in[i] << (24 - i * 8)) ^ *out; }

这是一个将4个字节的无符号字符型数组转换为一个无符号长整型的函数。具体实现是通过将每个字节左移位（第一个字节左移24位，第二个字节左移16位，第三个字节左移8位，第四个字节左移0位），然后进行异或操作得到最终的无符号长整型值。

函数的输入参数为一个无符号字符型指针，指向待转换的4个字节，以及一个无符号长整型指针，用于存储转换后的结果。函数没有返回值，结果直接存储在输出参数指向的地址中。

相关问题

using llong = long long; using ullong = unsigned long long; using ulong = unsigned long; using ushort = unsigned short; using uint = unsigned int; using i16 = int16_t; using i32 = int32_t; using i64 = int64_t; using i128 = __int128_t; using uch = uint8_t; using u16 = uint16_t; using u32 = uint32_t; using u64 = uint64_t; 修改成Windows可用的

要在Windows系统中使这些类型别名可用，你可以使用以下代码：

typedef long long llong;
typedef unsigned long long ullong;
typedef unsigned long ulong;
typedef unsigned short ushort;
typedef unsigned int uint;

typedef int16_t i16;
typedef int32_t i32;
typedef int64_t i64;
typedef __int128_t i128;
typedef uint8_t uch;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;

这样就可以在Windows系统中使用这些类型别名了。请注意，这些类型别名可能需要包含相应的头文件，具体取决于你的代码中是否使用了相关的函数或数据类型。

max30100模块用stm32f103c8t6的hal库驱动程序

好的，下面是使用STM32F103C8T6的HAL库驱动MAX30100模块的步骤：

1. 首先，需要在CubeMX中配置STM32F103C8T6的GPIO和I2C外设。在GPIO中，配置SDA和SCL引脚为开漏输出模式。在I2C外设中，配置I2C的时钟速率和地址。

2. 在代码中包含MAX30100的I2C地址和命令字定义。

#define MAX30100_I2C_ADDRESS 0xAE
#define MAX30100_FIFO_WR_PTR 0x04
#define MAX30100_FIFO_RD_PTR 0x06
#define #define MAX30100_FIFO_DATA 0x07
#define MAX30100_MODE_CONFIG 0x09
#define MAX30100_SPO2_CONFIG 0x0A
#define MAX30100_LED_CONFIG 0x0C
#define MAX30100_TEMP_INT 0x1F
#define MAX30100_TEMP_FRAC 0x20

3. 初始化I2C外设和MAX30100模块。在初始化MAX30100模块时，需要配置模块的工作模式、采样速率、LED亮度和红外补偿系数等参数。

I2C_HandleTypeDef hi2c1;
void MAX30100_init(void){
  uint8_t tx_buffer[2];
  tx_buffer[0] = MAX30100_MODE_CONFIG;
  tx_buffer[1] = 0x03;
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_I2C_ADDRESS, tx_buffer, 2, 100);
  tx_buffer[0] = MAX30100_SPO2_CONFIG;
  tx_buffer[1] = 0x47;
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_I2C_ADDRESS, tx_buffer, 2, 100);
  tx_buffer[0] = MAX30100_LED_CONFIG;
  tx_buffer[1] = 0x1F;
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_I2C_ADDRESS, tx_buffer, 2, 100);
}

4. 读取MAX30100模块采集到的数据。首先需要读取FIFO读指针和写指针，计算出FIFO中数据的个数，然后通过I2C读取FIFO中的数据。

uint8_t readFIFO(uint32_t *pun_red_led, uint32_t *pun_ir_led){
  uint8_t uch_i;
  uint8_t ach_i2c_data[6];
  uint8_t uch_temp;
  uint8_t uch_finger_detected;
  uint8_t uch_samples_read;
  uint32_t un_temp;
  int16_t n_brightness_difference;
  *pun_red_led = 0;
  *pun_ir_led = 0;
  uch_samples_read = 0;
  uch_finger_detected = 0;
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_I2C_ADDRESS, &MAX30100_FIFO_WR_PTR, 1, 100);
  HAL_I2C_Master_Receive(&hi2c1, MAX30100_I2C_ADDRESS, &uch_temp, 1, 100);
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_I2C_ADDRESS, &MAX30100_FIFO_RD_PTR, 1, 100);
  HAL_I2C_Master_Receive(&hi2c1, MAX30100_I2C_ADDRESS, &uch_i, 1, 100);
  uch_samples_read = uch_i - uch_temp;
  if(uch_samples_read == 0){
    return 0;
  }
  for(uch_i = 0; uch_i < uch_samples_read; uch_i++){
    HAL_I2C_Master_Transmit(&hi2c1, MAX30100_I2C_ADDRESS, &MAX30100_FIFO_DATA, 1, 100);
    HAL_I2C_Master_Receive(&hi2c1, MAX30100_I2C_ADDRESS, ach_i2c_data, 6, 100);
    un_temp = (uint32_t)ach_i2c_data[0];
    un_temp <<= 16;
    *pun_red_led += un_temp;
    un_temp = (uint32_t)ach_i2c_data[1];
    un_temp <<= 8;
    *pun_red_led += un_temp;
    un_temp = (uint32_t)ach_i2c_data[2];
    *pun_red_led += un_temp;
    un_temp = (uint32_t)ach_i2c_data[3];
    un_temp <<= 16;
    *pun_ir_led += un_temp;
    un_temp = (uint32_t)ach_i2c_data[4];
    un_temp <<= 8;
    *pun_ir_led += un_temp;
    un_temp = (uint32_t)ach_i2c_data[5];
    *pun_ir_led += un_temp;
  }
  n_brightness_difference = (int16_t)(*pun_red_led >> 16) - (int16_t)(*pun_ir_led >> 16);
  if(n_brightness_difference < 0){
    n_brightness_difference = -n_brightness_difference;
  }
  if(n_brightness_difference > 500){
    uch_finger_detected = 1;
  }
  return uch_finger_detected;
}

通过以上步骤，就可以使用STM32F103C8T6的HAL库驱动MAX30100模块进行心率检测和血氧饱和度检测了。