ARM®mbed OS入门开发（五A）通过SPI与BMP280通信(mbed应用)

#ifdef _cplusplus
extern "C"{
#endif

... ...

#ifdef _cplusplus

}

#endif

#include "mbed.h"
#include "bmp280.h"
/************** SPI control mask******/
#define SPI_READ    0x80
#define SPI_WRITE   0x7F
/********************SPI function declarations***********************/

//SPI master连接到SPI通信引脚

SPI spi_bmp(SPI_MOSI, SPI_MISO, SPI_SCK);

DigitalOut CS(SPI_CS);

s8 BMP280_SPI_bus_write(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt);
s8 BMP280_SPI_bus_read(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt);
/********************End of SPI function declarations***********************/
void  Bus_routine(void);
void  BMP280_delay_msek(u32 msek);

struct bmp280_t bmp280;

Serial pc_my(SERIAL_TX, SERIAL_RX);

void Bus_routine(void) {
    bmp280.bus_write = BMP280_SPI_bus_write;
    bmp280.bus_read = BMP280_SPI_bus_read;
    bmp280.delay_msec = BMP280_delay_msek;
}
/*  Brief : The delay routine
*  param : delay in ms */
void  BMP280_delay_msek(u32 msek)
{
    /*Here you can write your own delay routine*/
}
s8  BMP280_SPI_bus_read(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt)
{
    int iError = BMP280_INIT_VALUE;
    CS=0;
    iError =spi_bmp.write(reg_addr | SPI_READ);
    for (u8 i = 0; i < cnt; i++)
        {
            reg_data = spi_bmp.write(0x00);
        }
    CS=1;
    return (s8)iError;
}
s8  BMP280_SPI_bus_write(u8 dev_addr, u8 reg_addr, u8 *reg_data, u8 cnt)
{
    int iError = BMP280_INIT_VALUE;
    CS=0;
    u8 *array = ®_addr;
    for(u8 i = 0; i < cnt; i++) {
       iError +=spi_bmp.write(array & SPI_WRITE);
        spi_bmp.write(reg_data);
    }
    CS=1;
    return (s8)iError;
}

int main()
{
    //首先初始化数据
    /* Assign the standby time*/
    u8 v_standby_time_u8 = BMP280_INIT_VALUE;
    /* For Individual data read APIs*/
    /* read uncompensated temperature*/
     s32 v_data_uncomp_tem_s32 = BMP280_INIT_VALUE;
    /* read uncompensated pressure*/
     s32 v_data_uncomp_pres_s32 = BMP280_INIT_VALUE;
    /* read real temperature*/
        double actual_temp = BMP280_INIT_VALUE;
    /* read real pressure*/
      double actual_press = BMP280_INIT_VALUE;
    /* Return status*/
    s32 com_rslt = ERROR;
    /* Set Baud */
    pc_my.baud(115200);
    //设置routine，将BMP280_SPI_bus_write/read传递给传感器读写

    Bus_routine();

    com_rslt=bmp280_init(&bmp280);
    if(com_rslt==0)
          pc_my.printf("initialization succeed!rn");
    else
          pc_my.printf("initialization failure!rn");
    /*设置工作模式为Normal mode*/
    com_rslt+= bmp280_set_power_mode(BMP280_NORMAL_MODE);
        if(com_rslt==0)
            pc_my.printf("set_power_mode succeed!rn");
        else
            pc_my.printf("set_power_mode failure!rn");

    /* 标准分辨率，Standby时间1ms*/

    bmp280_set_work_mode(BMP280_STANDARD_RESOLUTION_MODE);
    bmp280_set_standby_durn(BMP280_STANDBY_TIME_1_MS);
    bmp280_get_standby_durn(&v_standby_time_u8);
    while(1){
      //读取数据：
        /* APIs are used to read the uncompensated temperature/pressure*/
        bmp280_read_uncomp_temperature(&v_data_uncomp_tem_s32);
        bmp280_read_uncomp_pressure(&v_data_uncomp_pres_s32);
        /* APIs are used to read the true temperature/pressure*/
        /* Input value as uncompensated temperature/pressure*/
        actual_temp = bmp280_compensate_temperature_double(v_data_uncomp_tem_s32);
        actual_press = bmp280_compensate_pressure_double(v_data_uncomp_pres_s32);
        pc_my.printf("The uncompensated temperature is= %d, The uncompensated pressure is= %drn", v_data_uncomp_tem_s32, v_data_uncomp_pres_s32 );
        pc_my.printf("The actual temperature is= %f DegC, The actual pressure is= %f Parn ", actual_temp, actual_press);
        wait(2);   

    }
}