static unsigned char __softReset(void) {
unsigned char error = 0;
__resetConnection(); //reset communication
__startTransfer();
error += __writeByte(0x1e); //send RESET-command to sensor
return error; //error=1 in case of no response form the sensor
}
//----------------------------------------------------------------------------------
// 返回值单位0.01摄氏度
static int __readTemperature(void) {
unsigned int i;
int temp;
__resetConnection();
__writeByte(0x03);
vTaskDelay(configTICK_RATE_HZ * 320 / 1000);
for (i = 0; i < 500; ++i) {
if (__readDataBit() == 0) {
break;
}
vTaskDelay(configTICK_RATE_HZ / 10);
}
temp = __readData(); //会得到origin_temp
temp = temp - 4000; //calc. temperature from ticks to [%C]
//t=d1+d2*SOt
if (temp > 6000) {
temp = 6000; //cut if the value is outside of
}
if (temp < -900) {
temp = -900; //the physical possible range
}
return temp;
}
int writeByte_nonblocking(char byte, uint8_t usartn)
{
if (canWrite(usartn)) {
__writeByte(byte, usartn);
return 0;
}
return -1;
}
//----------------------------------------------------------------------------------
static int __readHumidity(int temp) {
unsigned int i;
int humi;
__resetConnection();
__writeByte(0x05);
vTaskDelay(configTICK_RATE_HZ * 400 / 1000);
for (i = 0; i < 500; ++i) {
if (__readDataBit() == 0) {
break;
}
vTaskDelay(configTICK_RATE_HZ / 10);
}
humi = __readData();
// temp_c = 0.01 * origin_temp - 40;
// rh_lin = humi*0.0405 - 0.0000028*humi*humi - 4.0;
// rh_true = rh_lin + (temp_c-25)*(0.01+0.00008*humi);
// rh_true = (rh_lin * 100) + (temp - 2500) * (0.01 + 0.00008 * humi); // *100
// rh_true = (rh_lin * 100*100000) + (temp - 2500) * (1000 + 8 * humi); // *100*100000
// rh_true = ((humi * 0.0405 - 0.0000028 * humi * humi - 4.0) * 100000000) + (temp - 2500) * (1000 + 8 * humi); // *100*100000
// rh_true = ((humi * 405000 - 28 * humi * humi - 40000000)) + (temp - 2500) * (1000 + 8 * humi); // *100*100000
// rh_true = rh_true / (1000 * 10000);
humi = ((humi * 405000 - 28 * humi * humi - 40000000)) + (temp - 2500) * (1000 + 8 * humi); // *100*100000
humi = humi / (100 * 10000);
if (humi > 999) {
humi = 999;
}
if (humi < 1) {
humi = 1;
}
return humi;
}
