[活动专区] 【AT-START-F437测评】+I2C采集max30102血氧数据

//各引脚初始化

void gpio_config(void)

{

        gpio_init_type gpio_init_struct;

  /* enable the gpioa clock */

  crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);



  /* set default parameter */

  gpio_default_para_init(&gpio_init_struct);

        

  /* configure button pin as input with pull-up/pull-down */

  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

  gpio_init_struct.gpio_out_type  = GPIO_OUTPUT_PUSH_PULL;

  gpio_init_struct.gpio_mode = GPIO_MODE_INPUT;

  gpio_init_struct.gpio_pins = GPIO_PINS_9;  //MAX30102中断引脚

  gpio_init_struct.gpio_pull = GPIO_PULL_UP;

  gpio_init(GPIOB, &gpio_init_struct);

        

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  main function.

  * @param  none

  * @retval none

  */

int main(void)

{

  //i2c_status_type i2c_status;



  /* initial system clock */

  system_clock_config();



  /* config nvic priority group */

  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);



  /* at board initial */

  at32_board_init();//初始化LED



  hi2c2.i2cx = I2Cx_PORT;



  /* i2c config */

  i2c_config(&hi2c2); //初始化I2C

  gpio_config(); //初始胡GPIO

  uart_print_init(115200);//初始化串口



        

  max30102_init();

  while(1)

  {

         if (gpio_input_data_bit_read(GPIOB, GPIO_PINS_9) == 0)  //当采集到数据

        {        

                at32_led_toggle(LED4);   //LED4翻转

                max30102_cal();  //计算血氧浓度

                uint8_t spo2 = max30102_getSpO2();

                uint8_t heartReat = max30102_getHeartRate();

                printf("spos2= : [%d] heartReat = [%d] \n",spo2,heartReat);//上传数据到串口

                

         }

          

        

 }

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  initializes peripherals used by the i2c.

  * @param  none

  * @retval none

  */

void i2c_lowlevel_init(i2c_handle_type* hi2c)

{

  gpio_init_type gpio_init_structure;



  if(hi2c->i2cx == I2Cx_PORT)

  {

    /* i2c periph clock enable */

    crm_periph_clock_enable(I2Cx_CLK, TRUE);

    crm_periph_clock_enable(I2Cx_SCL_GPIO_CLK, TRUE);

    crm_periph_clock_enable(I2Cx_SDA_GPIO_CLK, TRUE);



    /* gpio configuration */

    gpio_pin_mux_config(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_GPIO_PinsSource, I2Cx_SCL_GPIO_MUX);



    gpio_pin_mux_config(I2Cx_SDA_GPIO_PORT, I2Cx_SDA_GPIO_PinsSource, I2Cx_SDA_GPIO_MUX);



    /* configure i2c pins: scl */

    gpio_init_structure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

    gpio_init_structure.gpio_mode           = GPIO_MODE_MUX;

    gpio_init_structure.gpio_out_type       = GPIO_OUTPUT_OPEN_DRAIN;

    gpio_init_structure.gpio_pull           = GPIO_PULL_UP;



    gpio_init_structure.gpio_pins           = I2Cx_SCL_GPIO_PIN;

    gpio_init(I2Cx_SCL_GPIO_PORT, &gpio_init_structure);



    /* configure i2c pins: sda */

    gpio_init_structure.gpio_pins           = I2Cx_SDA_GPIO_PIN;

    gpio_init(I2Cx_SDA_GPIO_PORT, &gpio_init_structure);



    /* configure and enable i2c interrupt */

    nvic_irq_enable(I2Cx_EVT_IRQn, 0, 0);

    nvic_irq_enable(I2Cx_ERR_IRQn, 0, 0);



    /* config i2c */

    i2c_init(hi2c->i2cx, 0x0F, I2Cx_CLKCTRL);



    i2c_own_address1_set(hi2c->i2cx, I2C_ADDRESS_MODE_7BIT, I2Cx_ADDRESS);

  }

}

void max30102_init()

{

    uint8_t data = 0;

    /*reset*/

    data = 0x40;

    i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_MODE_CONFIGURATION, &data, 1, 0xffffff);

    do

    {

                i2c_memory_read(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_READ, RES_MODE_CONFIGURATION, &data, 1, 0xffffff);

    } while (data & 0x40);

    /*新数据中断*/

    data = 0x40;

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_INTERRUPT_ENABLE_1, &data, 1, 0xffffff);



    /*16384量程 50Hz 18位adc分辨率*/

    data = 0x63;

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_SPO2_CONFIGURATION, &data, 1, 0xffffff);

    /*灯的亮度*/

    data = 0x47;

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_LED_PLUSE_AMPLITUDE_1, &data, 1, 0xffffff);

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_LED_PLUSE_AMPLITUDE_2, &data, 1, 0xffffff);

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_PROXIMITY_MODE_LED_PLUSE_AMPLITUDE, &data, 1, 0xffffff);

    /*FIFO clear*/

    data = 0;

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_FIFO_WRITE_POINTER, &data, 1, 0xffffff);

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_OVERFLOW_COUNTER, &data, 1, 0xffffff);

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_FIFO_READ_POINTER, &data, 1, 0xffffff);



    /*interrupt status clear*/

    max30102_getStatus();



    /*SPO2 Mode*/

    data = 0x03;

        i2c_memory_write(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_WRITE, RES_MODE_CONFIGURATION, &data, 1, 0xffffff);



}

uint8_t max30102_getUnreadSampleCount()

{

    uint8_t wr = 0, rd = 0;

        i2c_memory_read(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_READ, RES_FIFO_WRITE_POINTER, &wr, 1, 0xffffff);

        i2c_memory_read(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_READ, RES_FIFO_READ_POINTER, &rd, 1, 0xffffff);



    if ((wr - rd) < 0)

        return wr - rd + 32;

    else

        return wr - rd;

}



void max30102_getFIFO(SAMPLE *data, uint8_t sampleCount)

{

    uint8_t dataTemp[5 * 6];

    if (sampleCount > 5)

        sampleCount = 5;

        i2c_memory_read(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_READ, RES_FIFO_DATA_REGISTER, dataTemp, 6 * sampleCount, 0xffffff);



    uint8_t i;

    for (i = 0; i < sampleCount; i++)

    {

        data[i].red = (((uint32_t)dataTemp[i * 6]) << 16 | ((uint32_t)dataTemp[i * 6 + 1]) << 8 | dataTemp[i * 6 + 2]) & 0x3ffff;

        data[i].iRed = (((uint32_t)dataTemp[i * 6 + 3]) << 16 | ((uint32_t)dataTemp[i * 6 + 4]) << 8 | dataTemp[i * 6 + 5]) & 0x3ffff;

    }

}



uint8_t max30102_getStatus()

{

    uint8_t data = 0, dataTemp = 0;

        i2c_memory_read(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_READ, RES_INTERRUPT_STATUS_1, &dataTemp, 1, 0xffffff);

    data = dataTemp;

        i2c_memory_read(&hi2c2, I2C_MEM_ADDR_WIDIH_8, MAX30102_ADDR_READ, RES_INTERRUPT_STATUS_2, &dataTemp, 1, 0xffffff);

    return data | dataTemp;

}