STM32通过I2C与BMP280通信

BMP280气压传感器（Digital Pressure sensor）

测试流程图：

项目中使用的是I2C通信，BMP280的作为slave的地址要确认好，它的地址根据硬件电路SDO接什么脚来决定：

1.BMP280的测试启动流程（注意它的datasheet中的status寄存器）：
（1）读取BMP280的id,其值等于0x58。
（2）把补偿寄存器的值都读出来。
（3）对BMP280进行reset。
（4）对BMP280的数据采集精度，模式。。。等进行配置。
（5）给点延时，等待数据采集完毕放入寄存器中。
（6）读取寄存器中的采集数据。
注意：BMP280对温度和气压的测量是通过一堆补偿数据然后根据自己的算法算出来的，要注意这些数据是什么类型的，刚开始我就因为粗心没看清楚，算出来的数据总是不正确。

下面把代码贴出来：
1.bmp280的驱动文件：

1. #include

2. #include"stm32f4xx_hal.h"

3. #include"stm32f4xx_hal_i2c.h"

4. #include

6. #definedig_T1bmp280->T1

7. #definedig_T2bmp280->T2

8. #definedig_T3bmp280->T3

9. #definedig_P1bmp280->P1

10. #definedig_P2bmp280->P2

11. #definedig_P3bmp280->P3

12. #definedig_P4bmp280->P4

13. #definedig_P5bmp280->P5

14. #definedig_P6bmp280->P6

15. #definedig_P7bmp280->P7

16. #definedig_P8bmp280->P8

17. #definedig_P9bmp280->P9

19. staticuint8_tbmp280_read_register(I2C_HandleTypeDefBmp280_I2cHandle,uint8_treg_addr)

20. {

21. uint8_treg_data;

23. while(HAL_I2C_Master_Transmit(&Bmp280_I2cHandle,BMP280_ADDRESS,®_addr,1,10000)!=HAL_OK){

24. if(HAL_I2C_GetError(&Bmp280_I2cHandle)!=HAL_I2C_ERROR_AF){

25. printf("Transmitslaveaddresserror!!!rn");

26. return-1;

27. }

28. }

30. while(HAL_I2C_Master_Receive(&Bmp280_I2cHandle,BMP280_ADDRESS,®_data,1,10000)!=HAL_OK){

31. if(HAL_I2C_GetError(&Bmp280_I2cHandle)!=HAL_I2C_ERROR_AF){

32. printf("Receiveslavedataerror!!!rn");

33. return-1;

34. }

35. }

37. returnreg_data;

38. }

40. staticvoidbmp280_write_register(I2C_HandleTypeDefBmp280_I2cHandle,uint8_treg_addr,uint8_treg_data)

41. {

42. uint8_ttx_data[2]={reg_addr,reg_data};

44. while(HAL_I2C_Master_Transmit(&Bmp280_I2cHandle,BMP280_ADDRESS,tx_data,2,10000)!=HAL_OK){

45. if(HAL_I2C_GetError(&Bmp280_I2cHandle)!=HAL_I2C_ERROR_AF){

46. printf("Transmitslaveaddresserror!!!rn");

47. }

48. }

49. }

51. /**

52. *在bmp280_init()函数里默认初始化t_standby为0.5ms，

53. *温度和气压的采样精度设为最低，

54. *滤波器系数设为最低，

55. *并且进入sleepmode。

56. */

57. structbmp280*bmp280_init(I2C_HandleTypeDefI2cHandle)

58. {

59. uint8_tbmp280_id;

60. uint8_tlsb,msb;

61. uint8_tctrlmeas_reg,config_reg;

62. structbmp280*bmp280;

64. bmp280_id=bmp280_read_register(I2cHandle,BMP280_CHIPID_REG);

65. if(bmp280_id==0x58){

66. bmp280=malloc(sizeof(structbmp280));

68. bmp280->I2cHandle=I2cHandle;

69. bmp280->mode=BMP280_SLEEP_MODE;

70. bmp280->t_sb=BMP280_T_SB1;

71. bmp280->p_oversampling=BMP280_P_MODE_1;

72. bmp280->t_oversampling=BMP280_T_MODE_1;

73. bmp280->filter_coefficient=BMP280_FILTER_MODE_1;

74. }else{

75. printf("ReadBMP280iderror!rn");

76. returnNULL;

77. }

79. /*readthetemperaturecalibrationparameters*/

80. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_T1_LSB_REG);

81. msb=bmp280_read_register(I2cHandle,BMP280_DIG_T1_MSB_REG);

82. dig_T1=msb<<8|lsb;

83. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_T2_LSB_REG);

84. msb=bmp280_read_register(I2cHandle,BMP280_DIG_T2_MSB_REG);

85. dig_T2=msb<<8|lsb;

86. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_T3_LSB_REG);

87. msb=bmp280_read_register(I2cHandle,BMP280_DIG_T3_MSB_REG);

88. dig_T3=msb<<8|lsb;

90. /*readthepressurecalibrationparameters*/

91. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P1_LSB_REG);

92. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P1_MSB_REG);

93. dig_P1=msb<<8|lsb;

94. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P2_LSB_REG);

95. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P2_MSB_REG);

96. dig_P2=msb<<8|lsb;

97. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P3_LSB_REG);

98. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P3_MSB_REG);

99. dig_P3=msb<<8|lsb;

100. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P4_LSB_REG);

101. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P4_MSB_REG);

102. dig_P4=msb<<8|lsb;

103. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P5_LSB_REG);

104. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P5_MSB_REG);

105. dig_P5=msb<<8|lsb;

106. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P6_LSB_REG);

107. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P6_MSB_REG);

108. dig_P6=msb<<8|lsb;

109. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P7_LSB_REG);

110. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P7_MSB_REG);

111. dig_P7=msb<<8|lsb;

112. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P8_LSB_REG);

113. msb=bmp280_read_register(I2cHandle,BMP280_DIG_P8_MSB_REG);

114. dig_P8=msb<<8|lsb;

115. lsb=bmp280_read_register(I2cHandle,BMP280_DIG_P9_LSB_REG);