Future Electronics / hs3001-temp-sensor

Temperature sensor library for Sequana BLE Lab.

Hs3001Driver.cpp@1:b99360c421a7, 2019-03-22 (annotated)

Committer:
lru
Date:
Fri Mar 22 10:08:18 2019 +0000
Revision:
1:b99360c421a7
Parent:
0:680362180482 
Corrected TempSensor API description.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lru 0:680362180482 1 /*
lru 0:680362180482 2 * Copyright (c) 2017-2019 Future Electronics
lru 0:680362180482 3 *
lru 0:680362180482 4 * Licensed under the Apache License, Version 2.0 (the "License");
lru 0:680362180482 5 * you may not use this file except in compliance with the License.
lru 0:680362180482 6 * You may obtain a copy of the License at
lru 0:680362180482 7 *
lru 0:680362180482 8 * http://www.apache.org/licenses/LICENSE-2.0
lru 0:680362180482 9 *
lru 0:680362180482 10 * Unless required by applicable law or agreed to in writing, software
lru 0:680362180482 11 * distributed under the License is distributed on an "AS IS" BASIS,
lru 0:680362180482 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
lru 0:680362180482 13 * See the License for the specific language governing permissions and
lru 0:680362180482 14 * limitations under the License.
lru 0:680362180482 15 */
lru 0:680362180482 16
lru 0:680362180482 17 #include <mbed.h>
lru 0:680362180482 18 #include "Hs3001Driver.h"
lru 0:680362180482 19
lru 0:680362180482 20
lru 0:680362180482 21 Hs3001Driver::Status Hs3001Driver::read(uint16_t& humidity, int16_t& temperature)
lru 0:680362180482 22 {
lru 0:680362180482 23 static uint8_t buffer[4];
lru 0:680362180482 24 uint32_t val;
lru 0:680362180482 25
lru 0:680362180482 26 _i2c.read(_address, reinterpret_cast<char*>(buffer), 1);
lru 0:680362180482 27
lru 0:680362180482 28 if ((buffer[0] & 0xC0) == 0x40) {
lru 0:680362180482 29 return STATUS_STALLED;
lru 0:680362180482 30 }
lru 0:680362180482 31
lru 0:680362180482 32 _i2c.read(_address, reinterpret_cast<char*>(buffer), 4);
lru 0:680362180482 33 val = (((uint32_t)buffer[0] & 0x3f) << 8) | (uint32_t)buffer[1];
lru 0:680362180482 34 humidity = (uint16_t)((val * 100 + 0x2000) / 0x3fff);
lru 0:680362180482 35
lru 0:680362180482 36 val = (((uint32_t)buffer[2]) << 6) | (((uint32_t)buffer[3]) >> 2);
lru 0:680362180482 37 temperature = (int16_t)(val * 16500 / 0x3fff) - 4000;
lru 0:680362180482 38
lru 0:680362180482 39 // printf("hs3001: raw=%08lx, h=0x%04x, t=0x%04x\n", *reinterpret_cast<uint32_t*>(buffer), humidity, temperature);
lru 0:680362180482 40 return STATUS_OK;
lru 0:680362180482 41 }
lru 0:680362180482 42
lru 0:680362180482 43 void Hs3001Driver::start_conversion(void)
lru 0:680362180482 44 {
lru 0:680362180482 45 static char buffer = 0;
lru 0:680362180482 46 _i2c.write(_address, &buffer, 1);
lru 0:680362180482 47 }
lru 0:680362180482 48