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文档 ADXL345的STM32驱动程序和硬件设计(ZT)
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ADXL345的STM32驱动程序和硬件设计(ZT)

STM32 Driver and Hardware Design for ADXL345 (ZT) by ADIForum

The netizen "Hunting Stars" was posted on Sina Weibo's blog post - "ADTM345 STM32 Driver and Hardware Design" (original link http://blog.sina.com.cn/s/blog_6754612e0101ag39.html ), with the author's consent Forward this forum

 

First, the hardware circuit interface picture

  1. The ADXL345 hardware interface picture uses the SPI port for communication, so that the data is read faster and can be converted into the IIC communication interface.

 

I found some IIC interfaces on the Internet, so I will do SPI communication on DIY.

2.STM32F103T series MCU    is rich in MCU resources, I am familiar with development speed.

The hardware circuit is first to achieve the function, so the design is relatively simple. Subsequent Xiaobian wants to do wireless Bluetooth data transmission, so the hardware interface of Bluetooth serial communication and 3.3V power management are also left on the hardware.

                                        

For the time being, the hardware is designed in such a way that it is designed as a double-layer PCB, thus reducing the space. Capacitance and resistance are 0805 easy to solder. The device is selected as a patch.

Second, the microcontroller driver code

1.ADXL345 port configuration function

#define ADXL345_FLAG_TIMEOUT ((uint32_t)0x1000)

#define ADXL345_SPI                                                        SPI1

#define ADXL345_SPI_CLK                                              RCC_APB2Periph_SPI1

#define ADXL345_SPI_SCK_PIN                                     GPIO_Pin_5                

#define ADXL345_SPI_SCK_GPIO_PORT                     GPIOA                     

#define ADXL345_SPI_SCK_GPIO_CLK                        RCC_APB2Periph_GPIOA

#define ADXL345_SPI_SCK_SOURCE                           GPIO_PinSource5

#define ADXL345_SPI_SCK_AF                                       GPIO_AF_5

#define ADXL345_SPI_MISO_PIN                                     GPIO_Pin_6                

#define ADXL345_SPI_MISO_GPIO_PORT                     GPIOA                     

#define ADXL345_SPI_MISO_GPIO_CLK                        RCC_APB2Periph_GPIOA

#define ADXL345_SPI_MISO_SOURCE                           GPIO_PinSource6

#define ADXL345_SPI_MISO_AF                                       GPIO_AF_5

#define ADXL345_SPI_MOSI_PIN                                      GPIO_Pin_7                

#define ADXL345_SPI_MOSI_GPIO_PORT                      GPIOA                     

#define ADXL345_SPI_MOSI_GPIO_CLK                         RCC_APB2Periph_GPIOA

#define ADXL345_SPI_MOSI_SOURCE                           GPIO_PinSource7

#define ADXL345_SPI_MOSI_AF                                       GPIO_AF_5

#define ADXL345_SPI_CS_PIN                                          GPIO_Pin_2                

#define ADXL345_SPI_CS_GPIO_PORT                          GPIOB                     

#define ADXL345_SPI_CS_GPIO_CLK                             RCC_APB2Periph_GPIOB

#define ADXL345_SPI_INT1_PIN                                        GPIO_Pin_0                

#define ADXL345_SPI_INT1_GPIO_PORT                        GPIOB                     

#define ADXL345_SPI_INT1_GPIO_CLK                           RCC_APB2Periph_GPIOB

#define ADXL345_SPI_INT1_EXTI_LINE                            EXTI_Line0

#define ADXL345_SPI_INT1_EXTI_PORT_SOURCE      EXTI_PortSourceGPIOB

#define ADXL345_SPI_INT1_EXTI_PIN_SOURCE           EXTI_PinSource0

#define ADXL345_SPI_INT1_EXTI_IRQn                            EXTI0_IRQn

#define ADXL345_SPI_INT2_PIN                                         GPIO_Pin_1                

#define ADXL345_SPI_INT2_GPIO_PORT                         GPIOB                     

#define ADXL345_SPI_INT2_GPIO_CLK                            RCC_APB2Periph_GPIOB

#define ADXL345_SPI_INT2_EXTI_LINE                            EXTI_Line1

#define ADXL345_SPI_INT2_EXTI_PORT_SOURCE       EXTI_PortSourceGPIOB

#define ADXL345_SPI_INT2_EXTI_PIN_SOURCE            EXTI_PinSource1

#define ADXL345_SPI_INT2_EXTI_IRQn                             EXTI1_IRQn

#define ADXL345_WHO_AM_I_ADDR                   0x0F

#define ADXL345_CTRL_REG1_ADDR                 0x20

#define ADXL345_CTRL_REG2_ADDR                 0x21

#define ADXL345_CTRL_REG3_ADDR                 0x22

#define ADXL345_CTRL_REG4_ADDR                 0x23

#define ADXL345_CTRL_REG5_ADDR                 0x24

#define ADXL345_REFERENCE_REG_ADDR     0x25

#define ADXL345_OUT_TEMP_ADDR                   0x26

#define ADXL345_STATUS_REG_ADDR              0x27

#define ADXL345_OUT_X_L_ADDR                       0x28

#define ADXL345_OUT_X_H_ADDR                      0x29

#define ADXL345_OUT_Y_L_ADDR                       0x2A

#define ADXL345_OUT_Y_H_ADDR                      0x2B

#define ADXL345_OUT_Z_L_ADDR                       0x2C

#define ADXL345_OUT_Z_H_ADDR                      0x2D

#define ADXL345_FIFO_CTRL_REG_ADDR        0x2E

#define ADXL345_FIFO_SRC_REG_ADDR         0x2F

#define ADXL345_INT1_CFG_ADDR                    0x30

#define ADXL345_INT1_SRC_ADDR                    0x31

#define ADXL345_INT1_TSH_XH_ADDR             0x32

#define ADXL345_INT1_TSH_XL_ADDR             0x33

#define ADXL345_INT1_TSH_YH_ADDR             0x34

#define ADXL345_INT1_TSH_YL_ADDR             0x35

#define ADXL345_INT1_TSH_ZH_ADDR            0x36

#define ADXL345_INT1_TSH_ZL_ADDR             0x37

#define ADXL345_INT1_DURATION_ADDR       0x38

#define I_AM_ADXL345      ((uint8_t)0xD4)

#define ADXL345_MODE_POWERDOWN       ((uint8_t)0x00)

#define ADXL345_MODE_ACTIVE          ((uint8_t)0x08)

#define ADXL345_OUTPUT_DATARATE_1    ((uint8_t)0x00)

#define ADXL345_OUTPUT_DATARATE_2    ((uint8_t)0x40)

#define ADXL345_OUTPUT_DATARATE_3    ((uint8_t)0x80)

#define ADXL345_OUTPUT_DATARATE_4    ((uint8_t)0xC0)

#define ADXL345_X_ENABLE            ((uint8_t)0x02)

#define ADXL345_Y_ENABLE            ((uint8_t)0x01)

#define ADXL345_Z_ENABLE            ((uint8_t)0x04)

#define ADXL345_AXES_ENABLE         ((uint8_t)0x07)

#define ADXL345_AXES_DISABLE        ((uint8_t)0x00)

#define ADXL345_BANDWIDTH_1         ((uint8_t)0x00)

#define ADXL345_BANDWIDTH_2         ((uint8_t)0x10)

#define ADXL345_BANDWIDTH_3         ((uint8_t)0x20)

#define ADXL345_BANDWIDTH_4         ((uint8_t)0x30)

#define ADXL345_FULLSCALE_250               ((uint8_t)0x00)

#define ADXL345_FULLSCALE_500               ((uint8_t)0x10)

#define ADXL345_FULLSCALE_2000              ((uint8_t)0x20)

#define ADXL345_BlockDataUpdate_Continous   ((uint8_t)0x00)

#define ADXL345_BlockDataUpdate_Single      ((uint8_t)0x80)

#define ADXL345_BLE_LSB                     ((uint8_t)0x00)

#define ADXL345_BLE_MSB                    ((uint8_t)0x40)

#define ADXL345_HIGHPASSFILTER_DISABLE      ((uint8_t)0x00)

#define ADXL345_HIGHPASSFILTER_ENABLE      ((uint8_t)0x10)

#define ADXL345_INT1INTERRUPT_DISABLE       ((uint8_t)0x00)

#define ADXL345_INT1INTERRUPT_ENABLE    ((uint8_t)0x80)

#define ADXL345_INT2INTERRUPT_DISABLE       ((uint8_t)0x00)

#define ADXL345_INT2INTERRUPT_ENABLE    ((uint8_t)0x08)

#define ADXL345_INT1INTERRUPT_LOW_EDGE      ((uint8_t)0x20)

#define ADXL345_INT1INTERRUPT_HIGH_EDGE     ((uint8_t)0x00)

#define ADXL345_BOOT_NORMALMODE             ((uint8_t)0x00)

#define ADXL345_BOOT_REBOOTMEMORY           ((uint8_t)0x80)

#define ADXL345_HPM_NORMAL_MODE_RES         ((uint8_t)0x00)

#define ADXL345_HPM_REF_SIGNAL              ((uint8_t)0x10)

#define ADXL345_HPM_NORMAL_MODE             ((uint8_t)0x20)

#define ADXL345_HPM_AUTORESET_INT           ((uint8_t)0x30)

#define ADXL345_HPFCF_0              0x00

#define ADXL345_HPFCF_1              0x01

#define ADXL345_HPFCF_2              0x02

#define ADXL345_HPFCF_3              0x03

#define ADXL345_HPFCF_4              0x04

#define ADXL345_HPFCF_5              0x05

#define ADXL345_HPFCF_6              0x06

#define ADXL345_HPFCF_7              0x07

#define ADXL345_HPFCF_8              0x08

#define ADXL345_HPFCF_9              0x09

#define ADXL345_CS_LOW()       GPIO_ResetBits(ADXL345_SPI_CS_GPIO_PORT, ADXL345_SPI_CS_PIN)

#define ADXL345_CS_HIGH()      GPIO_SetBits(ADXL345_SPI_CS_GPIO_PORT, ADXL345_SPI_CS_PIN)

void ADXL345_Init(ADXL345_InitTypeDef *ADXL345_InitStruct);

void ADXL345_RebootCmd(void);

void ADXL345_INT1InterruptCmd(uint8_t InterruptState);

void ADXL345_INT2InterruptCmd(uint8_t InterruptState);

void ADXL345_INT1InterruptConfig(ADXL345_InterruptConfigTypeDef *ADXL345_IntConfigStruct);

uint8_t ADXL345_GetDataStatus(void);

void ADXL345_FilterConfig(ADXL345_FilterConfigTypeDef *ADXL345_FilterStruct);

void ADXL345_FilterCmd(uint8_t HighPassFilterState);

void ADXL345_Write(uint8_t* pBuffer, uint8_t WriteAddr, uint16_t NumByteToWrite);

void ADXL345_Read(uint8_t* pBuffer, uint8_t ReadAddr, uint16_t NumByteToRead);

2.ADXL345的SPI配置函数

void SPI_init(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  SPI_InitTypeDef    SPI_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA |

                         RCC_APB2Periph_GPIOB, ENABLE);

  RCC_APB2PeriphClockCmd(ADXL345_SPI_CLK ,ENABLE);

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin =ADXL345_SPI_CS_PIN ;

  GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(ADXL345_SPI_CS_GPIO_PORT, &GPIO_InitStructure);

  GPIO_SetBits(ADXL345_SPI_CS_GPIO_PORT,ADXL345_SPI_CS_PIN);

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin =ADXL345_SPI_SCK_PIN|ADXL345_SPI_MISO_PIN|ADXL345_SPI_MOSI_PIN;

  GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(ADXL345_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

   SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex;

   SPI_InitStructure.SPI_Mode=SPI_Mode_Master;

   SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

   SPI_InitStructure.SPI_CPOL=SPI_CPOL_High;

   SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge;

   SPI_InitStructure.SPI_NSS=SPI_NSS_Soft;

   SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_256;

   SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;

   SPI_InitStructure.SPI_CRCPolynomial=7;

   SPI_Init(ADXL345_SPI, &SPI_InitStructure);

   SPI_Cmd(ADXL345_SPI,ENABLE); 

}

 

3.ADXL345初始化配置函数

void ADXL345_init(void)

{

    SPI_init();   //ADXL345¶Ë¿Ú³õʼ»¯ÅäÖÃSPIͨÐÅ

   ADXL345_write_byte(0x1E,0x00); //X Æ«ÒÆÁ¿ ¸ù¾Ý²âÊÔ´«¸ÐÆ÷µÄ״̬дÈëpdf29Ò³ 0X00 (15.6mg/LSB)

   ADXL345_write_byte(0x1F,0x00); //Y Æ«ÒÆÁ¿ ¸ù¾Ý²âÊÔ´«¸ÐÆ÷µÄ״̬дÈëpdf29Ò³ 0X00 (15.6mg/LSB)

   ADXL345_write_byte(0x20,0x00); //Z Æ«ÒÆÁ¿ ¸ù¾Ý²âÊÔ´«¸ÐÆ÷µÄ״̬дÈëpdf29Ò³ 0X00 (15.6mg/LSB)

   ADXL345_write_byte(0x21,0x00);  //Çû÷ÑÓʱ0:½ûÓÃ; (1.25ms/LSB)

   ADXL345_write_byte(0x22,0x00);  //¼ì²âµÚÒ»´ÎÇû÷ºóµÄÑÓʱ0:½ûÓÃ; (1.25ms/LSB)

   ADXL345_write_byte(0x23,0x00);  //Çû÷´°¿Ú0:½ûÓÃ; (1.25ms/LSB)

   ADXL345_write_byte(0x24,0x01);  //±£´æ¼ì²â»î¶¯·§Öµ; (62.5mg/LSB)

   ADXL345_write_byte(0x25,0x01);  //±£´æ¼ì²â¾²Ö¹·§Öµ; (62.5mg/LSB)

   ADXL345_write_byte(0x26,0x2B);  //¼ì²â»î¶¯Ê±¼ä·§Öµ; (1s/LSB)

   ADXL345_write_byte(0x27,0x00);  //

   ADXL345_write_byte(0x28,0x09);  //×ÔÓÉÂäÌå¼ì²âÍÆ¼ö·§Öµ; (62.5mg/LSB)

   ADXL345_write_byte(0x29,0xFF);  //×ÔÓÉÂäÌå¼ì²âʱ¼ä·§Öµ,ÉèÖÃΪ×î´óʱ¼ä; (5ms/LSB)

   ADXL345_write_byte(0x2A,0x80);  //

   //ADXL345_read_byte(0x2B);    //Ö»¶Á¼Ä´æÆ÷,״̬¶ÁÈ¡

   ADXL345_write_byte(0x2C,0x0F); //ËÙÂÊÉ趨Ϊ3200HZ²Î¿¼pdf13Ò³ 0X0A 1OO,0X0E 1600HZ

   ADXL345_write_byte(0x2D,0x08); //Ñ¡ÔñµçԴģʽ¹Ø±Õ×Ô¶¯ÐÝÃß,ÐÝÃß,»½Ðѹ¦Äܲο¼pdf24Ò³

   ADXL345_write_byte(0x2E,0x80);  //ʹÄÜ DATA_READY ÖжÏ

   ADXL345_write_byte(0x2F,0x00);

   //ADXL345_read_byte(0x30);    //Ö»¶Á¼Ä´æÆ÷,״̬¶ÁÈ¡

   ADXL345_write_byte(0x31,0X0B); //Êý¾ÝͨПñʽ;ÉèÖÃΪ×Լ칦ÄܽûÓÃ,4ÏßÖÆSPI½Ó¿Ú,µÍµçƽÖжÏÊä³ö,13λȫ·Ö±æÂÊ,Êä³öÊý¾ÝÓÒ¶ÔÆë,16gÁ¿³Ì

   ADXL345_write_byte(0x38,0x00);  //FIFOģʽÉ趨,Streamģʽ£¬´¥·¢Á¬½ÓINT1,31¼¶Ñù±¾»º³å

  //ADXL345_read_byte(0x39);    //Ö»¶Á¼Ä´æÆ÷,״̬¶ÁÈ¡

}

 

4.ADXL345的读写函数

u8 ADXL345_read_byte(u8 add)

{

     GPIO_ResetBits(ADXL345_SPI_CS_GPIO_PORT ,ADXL345_SPI_CS_PIN);

     SPI_I2S_SendData(ADXL345_SPI,(add|0x80)<<8|0x00);

    while(SPI_I2S_GetFlagStatus(ADXL345_SPI,SPI_I2S_FLAG_TXE)==RESET);

    while(SPI_I2S_GetFlagStatus(ADXL345_SPI, SPI_I2S_FLAG_RXNE)==RESET);

    GPIO_SetBits(ADXL345_SPI_CS_GPIO_PORT ,ADXL345_SPI_CS_PIN);

    return SPI_I2S_ReceiveData(ADXL345_SPI)&0xff;

  }

void ADXL345_write_byte(u8 add,u8 val)

{

     GPIO_ResetBits(ADXL345_SPI_CS_GPIO_PORT ,ADXL345_SPI_CS_PIN);

     SPI_I2S_SendData(ADXL345_SPI,add<<8|val);

    while(SPI_I2S_GetFlagStatus(ADXL345_SPI,SPI_I2S_FLAG_TXE)==RESET);

    while(SPI_I2S_GetFlagStatus(ADXL345_SPI, SPI_I2S_FLAG_RXNE)==RESET);

    GPIO_SetBits(ADXL345_SPI_CS_GPIO_PORT ,ADXL345_SPI_CS_PIN);

     SPI_I2S_ReceiveData(ADXL345_SPI)&0xff;

  }

void ADXL345_ReadXYZ(float *g)

{

    uint8_t BUF[6];   // ´æ·ÅX,Y,ZÖáµÄÊý¾Ý

    int16_t temp;

    BUF[0] = ADXL345_read_byte(0x32); 

    BUF[1] = ADXL345_read_byte(0x33);

     delay_ms(1);  

    BUF[2] = ADXL345_read_byte(0x34);

    BUF[3] = ADXL345_read_byte(0x35);

     delay_ms(1);   

    BUF[4] = ADXL345_read_byte(0x36); 

    BUF[5] = ADXL345_read_byte(0x37);  

      delay_ms(1);

    temp = (BUF[1] << 8) + BUF[0];

    if(temp < 0)

        Temp = -temp;

    g[0] = (float)(temp * 3.9); //1⁄4ÆËãÊý3⁄4ÝoÍÏÔÊ3⁄4,2é¿ 1⁄4ADXL345¿ ËÙÈëËÙÈëÅÅμÚ4Ò3

    Temp = (BUF[3] << 8) + BUF[2];

    If(temp < 0)

        Temp = -temp;

    g[1] = (float)(temp * 3.9); //1⁄4ÆËãÊý3⁄4ÝoÍÏÔÊ3⁄4,2é¿ 1⁄4ADXL345¿ ËÙÈëËÙÈëÅÅμÚ4Ò3

    Temp = (BUF[5] << 8) + BUF[4];

    If(temp < 0)

        Temp = -temp;

    g[2] = (float)(temp * 3.9); //1⁄4ÆËãÊý3⁄4ÝoÍÏÔÊ3⁄4,2é¿ 1⁄4ADXL345¿ ËÙÈëËÙÈëÅÅμÚ4Ò3

}

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