[工业类传感器] [X-NUCLEO-IKS01A2测评] 移植IKS01A1例程

北方 2017-10-11 16:27 楼主

1、在mbed上的例程是基于X-NUCLEO-IKS01A1的，其中因为元件差别比较大，除了温湿度和压力传感器以外都是新的型号。所以在上一次评测中，只能使用温度数据的读出。
这次移植了该例程，并导入了新的库，测试成功。

2. 代码

/* Includes */
#include "mbed.h"
#include "XNucleoIKS01A2.h"
/* Instantiate the expansion board */
static XNucleoIKS01A2 *mems_expansion_board = XNucleoIKS01A2::instance();
/* Retrieve the composing elements of the expansion board */
static GyroSensor *gyroscope = mems_expansion_board->acc_gyro;
static MotionSensor *accelerometer = mems_expansion_board->accelerometer;
static MagneticSensor *magnetometer = mems_expansion_board->magnetometer;
static HumiditySensor *humidity_sensor = mems_expansion_board->ht_sensor;
static PressureSensor *pressure_sensor = mems_expansion_board->pt_sensor;
static TempSensor *temp_sensor1 = mems_expansion_board->ht_sensor;
static TempSensor *temp_sensor2 = mems_expansion_board->pt_sensor;
/* Helper function for printing floats & doubles */
static char *printDouble(char* str, double v, int decimalDigits=2)
{
int i = 1;
int intPart, fractPart;
int len;
char *ptr;
/* prepare decimal digits multiplicator */
for (;decimalDigits!=0; i*=10, decimalDigits--);
/* calculate integer & fractinal parts */
intPart = (int)v;
fractPart = (int)((v-(double)(int)v)*i);
/* fill in integer part */
sprintf(str, "%i.", intPart);
/* prepare fill in of fractional part */
len = strlen(str);
ptr = &str[len];
/* fill in leading fractional zeros */
for (i/=10;i>1; i/=10, ptr++) {
if(fractPart >= i) break;
*ptr = '0';
}
/* fill in (rest of) fractional part */
sprintf(ptr, "%i", fractPart);
return str;
}
/* Simple main function */
int main() {
uint8_t id;
float value1, value2;
char buffer1[32], buffer2[32];
int32_t axes[3];
printf("\r\n--- Starting new run ---\r\n");
humidity_sensor->read_id(&id);
printf("HTS221 humidity & temperature = 0x%X\r\n", id);
pressure_sensor->read_id(&id);
printf("LPS25H pressure & temperature = 0x%X\r\n", id);
magnetometer->read_id(&id);
printf("LIS3MDL magnetometer = 0x%X\r\n", id);
gyroscope->read_id(&id);
printf("LSM6DS0 accelerometer & gyroscope = 0x%X\r\n", id);
wait(3);
while(1) {
printf("\r\n");
temp_sensor1->get_temperature(&value1);
humidity_sensor->get_humidity(&value2);
printf("HTS221: [temp] %7s°C, [hum] %s%%\r\n", printDouble(buffer1, value1), printDouble(buffer2, value2));
temp_sensor2->get_fahrenheit(&value1);
pressure_sensor->get_pressure(&value2);
printf("LPS25H: [temp] %7s°F, [press] %smbar\r\n", printDouble(buffer1, value1), printDouble(buffer2, value2));
printf("---\r\n");
magnetometer->get_m_axes(axes);
printf("LIS3MDL [mag/mgauss]: %7ld, %7ld, %7ld\r\n", axes[0], axes[1], axes[2]);
accelerometer->get_x_axes(axes);
printf("LSM6DS0 [acc/mg]: %7ld, %7ld, %7ld\r\n", axes[0], axes[1], axes[2]);
gyroscope->get_g_axes(axes);
printf("LSM6DS0 [gyro/mdps]: %7ld, %7ld, %7ld\r\n", axes[0], axes[1], axes[2]);
wait(1.5);
}
}

3. 分析
其中的创建instance是关键，这次的范例，在没有设定引脚的null参数下，也判读后创建，避免了自己引脚不熟悉的结果，其中I2C用的是D14和D15
static XNucleoIKS01A2 *mems_expansion_board = XNucleoIKS01A2::instance()
之后，需要声明传感器的读取变量，
/* Retrieve the composing elements of the expansion board */
static GyroSensor *gyroscope = mems_expansion_board->acc_gyro;
static MotionSensor *accelerometer = mems_expansion_board->accelerometer;
static MagneticSensor *magnetometer = mems_expansion_board->magnetometer;
static HumiditySensor *humidity_sensor = mems_expansion_board->ht_sensor;
static PressureSensor *pressure_sensor = mems_expansion_board->pt_sensor;
static TempSensor *temp_sensor1 = mems_expansion_board->ht_sensor;
static TempSensor *temp_sensor2 = mems_expansion_board->pt_sensor;

这些传感器都在声明变量的时候初始化了，因此，不必再设定init指令，
在显示的数据中，还不是很正确，因为很多参数没有正确量化。不过，这个例程，可以供仔细分析和调试了。