市面上也有一些模块#xff1a;

BMP280是在BMP180基础上增强的绝对气压传感器在飞控领域的高度识别方面应用也比较多。

市面上也有一些模块

BMP280和STM32可以通过SPI或者I2C总线实现访问连接I2C接口连接管脚少这里采用I2C接口实现连接。

这里采用GPIO模拟I2C协议的方式所以随意找2个管脚作为SCL和SDA。

用I2C总线连接时BMP280的SDO管脚的电平状态用作I2C地址低位的选择。

这里以STM32F401CCU6和STM32CUBEIDE开发环境为例实现BMP280的访问读取数据采用USB虚拟串口或普通串口方式打印输出。

不同场景有推荐配置

代码逻辑识别USB虚拟串口是否连接如果连接则通过USB虚拟串口打印输出否则通过普通串口打印输出。

上电或重启后STM32对BMP280进行初始化如果失败则打印输出报错信息如果成功则循环进行检测和输出压力高度和温度值。

#ifndef

BMP280_CalTemperatureAndPressureAndAltitude(int32_t

*temperature,

{SCL_OUT_H;SDA_OUT_H;PY_Delay_us_t(100000);}void

I2C_Start(void)

;SDA_OUT_H;SCL_OUT_H;PY_Delay_us_t(us_num/2)

;SDA_OUT_L;PY_Delay_us_t(us_num/2)

;SCL_OUT_L;

{SCL_OUT_L;PY_Delay_us_t(us_num)

;SDA_OUT_L;PY_Delay_us_t(us_num)

;SCL_OUT_H;PY_Delay_us_t(us_num)

;SDA_OUT_H;PY_Delay_us_t(us_num)

}void

;SDA_OUT_L;PY_Delay_us_t(us_num/2)

;SCL_OUT_H;PY_Delay_us_t(us_num)

I2C_Read_Ack(void)

status0;SCL_OUT_L;PY_Delay_us_t(us_num/2)

;SDA_OUT_H;PY_Delay_us_t(us_num/2)

;status

SDA_IN;SCL_OUT_H;PY_Delay_us_t(us_num)

status;}void

i0;i8;i){PY_Delay_us_t(us_num/2)

;if((txd0x80)7)

SDA_OUT_L;txd1;PY_Delay_us_t(us_num/2)

;SCL_OUT_H;PY_Delay_us_t(us_num)

}uint8_t

){SCL_OUT_L;PY_Delay_us_t(us_num/2)

;SDA_OUT_H;PY_Delay_us_t(us_num/2)

(rdack)

(0x1e1)if(BMP280_I2C_ADDR_SEL0)

daddr

(0x771)I2C_Start();I2C_Send_Byte(daddr);I2C_Read_Ack();I2C_Send_Byte(WrAddr);I2C_Read_Ack();I2C_Send_Byte(data);I2C_Read_Ack();I2C_Stop();}uint8_t

RdAddr)

(0x771)I2C_Start();I2C_Send_Byte(daddr);I2C_Read_Ack();I2C_Send_Byte(RdAddr);I2C_Read_Ack();I2C_Start();I2C_Send_Byte(daddr1);I2C_Read_Ack();RegValueI2C_Read_Byte(0);I2C_Stop();return

RegValue;

BMP280_Compensate_Temperature(int32_t

adc_T)

BMP280_Compensate_Pressure(int32_t

adc_P)

BMP280_ReadReg(BMP280_PRESS_XLSB_REG);lsb

BMP280_ReadReg(BMP280_PRESS_LSB_REG);msb

BMP280_ReadReg(BMP280_PRESS_MSB_REG);adc_P

(msb

BMP280_Compensate_Pressure(adc_P);

}void

BMP280_Get_Temperature_And_Pressure(double

*temperature,

BMP280_ReadReg(BMP280_TEMP_XLSB_REG);lsb

BMP280_ReadReg(BMP280_TEMP_LSB_REG);msb

BMP280_ReadReg(BMP280_TEMP_MSB_REG);adc_T

(msb

BMP280_Compensate_Temperature(adc_T);xlsb

BMP280_ReadReg(BMP280_PRESS_XLSB_REG);lsb

BMP280_ReadReg(BMP280_PRESS_LSB_REG);msb

BMP280_ReadReg(BMP280_PRESS_MSB_REG);adc_P

(msb

BMP280_Compensate_Pressure(adc_P);

}#define

BMP280_CalculateAbsoluteAltitude(int32_t

*pAltitude,

BMP280_CalTemperatureAndPressureAndAltitude(int32_t

*temperature,

BMP280_Filter[3];BMP280_Get_Temperature_And_Pressure(CurTemperature,

CurPressure);BMP280_CalAvgValue(BMP280_Filter[0].Index,

pressure);BMP280_CalculateAbsoluteAltitude(CurAltitude,

(*pressure));BMP280_CalAvgValue(BMP280_Filter[1].Index,

CurAltitude,

Altitude);BMP280_CalAvgValue(BMP280_Filter[2].Index,

}void

BMP280_ReadReg(BMP280_DIG_T1_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_T1_MSB_REG);dig_T1

msb

BMP280_ReadReg(BMP280_DIG_T2_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_T2_MSB_REG);dig_T2

msb

BMP280_ReadReg(BMP280_DIG_T3_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_T3_MSB_REG);dig_T3

msb

BMP280_ReadReg(BMP280_DIG_P1_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P1_MSB_REG);dig_P1

msb

BMP280_ReadReg(BMP280_DIG_P2_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P2_MSB_REG);dig_P2

msb

BMP280_ReadReg(BMP280_DIG_P3_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P3_MSB_REG);dig_P3

msb

BMP280_ReadReg(BMP280_DIG_P4_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P4_MSB_REG);dig_P4

msb

BMP280_ReadReg(BMP280_DIG_P5_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P5_MSB_REG);dig_P5

msb

BMP280_ReadReg(BMP280_DIG_P6_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P6_MSB_REG);dig_P6

msb

BMP280_ReadReg(BMP280_DIG_P7_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P7_MSB_REG);dig_P7

msb

BMP280_ReadReg(BMP280_DIG_P8_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P8_MSB_REG);dig_P8

msb

BMP280_ReadReg(BMP280_DIG_P9_LSB_REG);msb

BMP280_ReadReg(BMP280_DIG_P9_MSB_REG);dig_P9

msb

BMP280_ReadReg(BMP280_REGISTER_CHIPID);u8CtrlMod

BMP280_ReadReg(BMP280_REGISTER_CONTROL);u8Status

BMP280_ReadReg(BMP280_REGISTER_STATUS);if(u8ChipID

0x58){if(USB_CONN_STATUS()){sprintf(console,

\r\nBMP280

u8ChipID,u8CtrlMod,u8Status);CDC_Transmit_FS((uint8_t*)console,

strlen(console));}else{printf(\r\nBMP280

initial

u8ChipID,u8CtrlMod,u8Status);}BMP280_WriteReg(BMP280_REGISTER_CONTROL,

0xFF);

registerBMP280_WriteReg(BMP280_REGISTER_CONFIG,

0x0C);

registerBMP280_Read_Calibration();}else{if(USB_CONN_STATUS()){sprintf(console,

\r\nBMP280

u8ChipID,u8CtrlMod,u8Status);CDC_Transmit_FS((uint8_t*)console,

strlen(console));}else{printf(\r\nBMP280

initial

u8ChipID,u8CtrlMod,u8Status);}return

BMP280_Init();}}

main.c文件的实现功能测试代码注意这里把BMP280管脚SDO拉到了高电平所以定义为#define

BMP280_I2C_ADDR_SEL

/*********************************************************************************

file

body*******************************************************************************

attention**

AS-IS.********************************************************************************/

USER

------------------------------------------------------------------*/

#include

----------------------------------------------------------*/

USER

-----------------------------------------------------------*/

USER

(uint32_t)(Delay*usDelayBase);delayReg

delayReg;

HAL_GetTick();PY_Delay_us_t(1000000)

;secondms

((float)1000)/(secondms-firstms);usDelayBase

coe*usDelayBase;

(uint32_t)((Delay%1000)*usDelayBase);if(msNum0)

delayReg;

------------------------------------------------------------*/

USER

-------------------------------------------------------------*/

USER

---------------------------------------------------------*/

UART_HandleTypeDef

-----------------------------------------------*/

void

---------------------------------------------------------*/

USER

abs(dn);if(dn%base0){for(uint8_t

j1;jflen;j){stra

0);}return;}else{if(flen1){sprintf(mc,

%d,

j1;jflen;j){if((dn%base)pow(10,j)){for(uint8_t

k1;k(flen-j);k){stra

Configuration--------------------------------------------------------*//*

Reset

*/MX_GPIO_Init();MX_USB_DEVICE_Init();MX_USART1_UART_Init();/*

USER

*/PY_usDelayTest();PY_usDelayOptimize();I2C_Init();BMP280_Init();PY_Delay_us_t(100000);

//Waiting

(1){BMP280_CalTemperatureAndPressureAndAltitude(TemperatureVal,

PressureVal,

AltitudeVal);if(USB_CONN_STATUS()){sprintf(console,

CDC_Transmit_FS((uint8_t*)console,

strlen(console))

PY_Delay_us_t(1);py_f2s4printf(mychar,

2);sprintf(console,

CDC_Transmit_FS((uint8_t*)console,

strlen(console))

PY_Delay_us_t(1);py_f2s4printf(mychar,

2);sprintf(console,

CDC_Transmit_FS((uint8_t*)console,

strlen(console))

PY_Delay_us_t(1);py_f2s4printf(mychar,

1);sprintf(console,

CDC_Transmit_FS((uint8_t*)console,

strlen(console))

PY_Delay_us_t(1);}else{printf(\r\n\r\n-----------------------------------------------);py_f2s4printf(mychar,

2);printf(\r\n

mychar);}PY_Delay_us_t(200000);/*

USER

voltage*/__HAL_RCC_PWR_CLK_ENABLE();__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);/**

Initializes

structure.*/RCC_OscInitStruct.OscillatorType

RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState

RCC_HSE_ON;RCC_OscInitStruct.PLL.PLLState

RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource

RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM

RCC_PLLP_DIV4;RCC_OscInitStruct.PLL.PLLQ

7;if

(HAL_RCC_OscConfig(RCC_OscInitStruct)

Initializes

clocks*/RCC_ClkInitStruct.ClockType

RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource

RCC_SYSCLKSOURCE_PLLCLK;RCC_ClkInitStruct.AHBCLKDivider

RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider

RCC_HCLK_DIV2;RCC_ClkInitStruct.APB2CLKDivider

RCC_HCLK_DIV1;if

(HAL_RCC_ClockConfig(RCC_ClkInitStruct,

FLASH_LATENCY_2)

UART_WORDLENGTH_8B;huart1.Init.StopBits

UART_STOPBITS_1;huart1.Init.Parity

UART_PARITY_NONE;huart1.Init.Mode

UART_MODE_TX_RX;huart1.Init.HwFlowCtl

UART_HWCONTROL_NONE;huart1.Init.OverSampling

USER

*/__HAL_RCC_GPIOH_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();__HAL_RCC_GPIOA_CLK_ENABLE();/*Configure

GPIO

GPIO_PIN_12|GPIO_PIN_13;GPIO_InitStruct.Mode

GPIO_MODE_OUTPUT_OD;GPIO_InitStruct.Pull

GPIO_PULLUP;GPIO_InitStruct.Speed

GPIO_SPEED_FREQ_VERY_HIGH;HAL_GPIO_Init(GPIOB,

GPIO_InitStruct);}/*

注意芯片内部已经配置选用了滤波功能采用滤波功能后的输出速率不高对于外部进行静态高度测量可以再进行取多次平均的算法如果是运动过程高度测量则不必再采用平均算法。

另外可以给

测试输出