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ADXL345的STM32驱动程序和硬件设计(ZT)

ADIForum 員工 在 2014-1-7 建立的討論區

网友“追风星空”发布于新浪微博的博文——“ADXL345的STM32驱动程序和硬件设计”(原文链接http://blog.sina.com.cn/s/blog_6754612e0101ag39.html ),经作者同意转发本论坛


 

一、硬件电路接口图片

  1.ADXL345硬件接口图片使用的是SPI端口进行通信,这样读取数据比较快且后续也可以转化为IIC通信接口。


在网上找一些发现IIC接口的比较多,所以本人就DIY做SPI的通信。

1.jpg

 

2.STM32F103T系列单片机作为MCU    资源比较丰富、本人比较熟悉开发速度较快

2.jpg

 

硬件电路首先是为了实现功能,所以设计比较简单。后续小编想做无线蓝牙的数据传输,所以硬件上也留了蓝牙串口通信的硬件接口和3.3V电源管理。

3.jpg  4.jpg                                      

 

暂且将硬件这样设计,设计为双层PCB 这样减少了空间。电容、电阻为0805的易焊接。器件都选为贴片。

 

二、单片机驱动代码

 

1.ADXL345的端口配置函数

#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);  //×ÔÓÉÂäÌå¼ì²âÍƼö·§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);  //¼ÆËãÊý¾ÝºÍÏÔʾ,²é¿¼ADXL345¿ìËÙÈëÃŵÚ4Ò³

 

    temp = (BUF[3] << 8) + BUF[2];

    if(temp < 0)

        temp = -temp;

    g[1] = (float)(temp * 3.9);  //¼ÆËãÊý¾ÝºÍÏÔʾ,²é¿¼ADXL345¿ìËÙÈëÃŵÚ4Ò³

    temp = (BUF[5] << 8) + BUF[4];

    if(temp < 0)

        temp = -temp;

    g[2] = (float)(temp * 3.9);  //¼ÆËãÊý¾ÝºÍÏÔʾ,²é¿¼ADXL345¿ìËÙÈëÃŵÚ4Ò³

}

結果