帮我写一下关于他的开发代码
时间: 2023-08-28 08:27:26 浏览: 34
好的,下面是一个简单的BMP280和STM32的I2C通信代码示例,使用STM32的HAL库:
```c
#include "stm32f4xx_hal.h"
#include "bmp280.h"
I2C_HandleTypeDef hi2c1;
void BMP280_Init(void)
{
uint8_t pData[2];
HAL_I2C_Mem_Read(&hi2c1, BMP280_ADDR, BMP280_REG_ID, I2C_MEMADD_SIZE_8BIT, pData, 1, 100);
if(pData[0] == BMP280_CHIP_ID)
{
// BMP280 is present, continue with initialization
// set config and ctrl_meas registers as per your requirements
uint8_t config_data = 0x40; // standby time = 1000ms, filter = 0
HAL_I2C_Mem_Write(&hi2c1, BMP280_ADDR, BMP280_REG_CONFIG, I2C_MEMADD_SIZE_8BIT, &config_data, 1, 100);
uint8_t ctrl_meas_data = 0x27; // pressure oversampling = x16, temperature oversampling = x2, normal mode
HAL_I2C_Mem_Write(&hi2c1, BMP280_ADDR, BMP280_REG_CTRL_MEAS, I2C_MEMADD_SIZE_8BIT, &ctrl_meas_data, 1, 100);
}
}
void BMP280_Read_Temp_Press(float *temp, float *press)
{
uint8_t pData[6];
int32_t adc_T, adc_P;
float var1, var2, t_fine;
HAL_I2C_Mem_Read(&hi2c1, BMP280_ADDR, BMP280_REG_PRESS_MSB, I2C_MEMADD_SIZE_8BIT, pData, 6, 100);
adc_P = (pData[0] << 12) | (pData[1] << 4) | (pData[2] >> 4);
adc_T = (pData[3] << 12) | (pData[4] << 4) | (pData[5] >> 4);
var1 = ((float)adc_T / 16384.0f - (float)BMP280_Dig_T1 / 1024.0f) * (float)BMP280_Dig_T2;
var2 = (((float)adc_T / 131072.0f - (float)BMP280_Dig_T1 / 8192.0f) * ((float)adc_T / 131072.0f - (float)BMP280_Dig_T1 / 8192.0f)) * (float)BMP280_Dig_T3;
t_fine = (int32_t)(var1 + var2);
*temp = (float)(t_fine / 5120.0f);
var1 = ((float)t_fine / 2.0f) - 64000.0f;
var2 = var1 * var1 * (float)BMP280_Dig_P6 / 32768.0f;
var2 = var2 + var1 * (float)BMP280_Dig_P5 * 2.0f;
var2 = (var2 / 4.0f) + ((float)BMP280_Dig_P4 * 65536.0f);
var1 = ((float)BMP280_Dig_P3 * var1 * var1 / 524288.0f + (float)BMP280_Dig_P2 * var1) / 524288.0f;
var1 = (1.0f + var1 / 32768.0f) * (float)BMP280_Dig_P1;
if(var1 == 0.0f)
{
*press = 0.0f;
return;
}
*press = 1048576.0f - (float)adc_P;
*press = (*press - (var2 / 4096.0f)) * 6250.0f / var1;
var1 = (float)BMP280_Dig_P9 * (*press) * (*press) / 2147483648.0f;
var2 = *press * (float)BMP280_Dig_P8 / 32768.0f;
*press = *press + (var1 + var2 + (float)BMP280_Dig_P7) / 16.0f;
}
int main(void)
{
float temp, press;
HAL_Init();
/* Configure the system clock to 168 MHz */
SystemClock_Config();
/* Initialize I2C peripheral */
MX_I2C1_Init();
/* Initialize BMP280 sensor */
BMP280_Init();
while (1)
{
/* Read temperature and pressure */
BMP280_Read_Temp_Press(&temp, &press);
/* Do something with temperature and pressure data */
HAL_Delay(1000);
}
}
```
这个代码假设您已经定义了BMP280芯片的地址(BMP280_ADDR)和寄存器地址(例如BMP280_REG_ID、BMP280_REG_CTRL_MEAS等),并且已经读取了BMP280的校准数据(BMP280_Dig_T1到BMP280_Dig_P9)。如果您不知道这些值,您需要查看BMP280的数据手册,或者使用一个现成的BMP280库。