Diff: Hs3001Driver.cpp

Revision:

0:680362180482

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Hs3001Driver.cpp	Thu Mar 14 12:40:38 2019 +0000
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017-2019 Future Electronics
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <mbed.h>
+#include "Hs3001Driver.h"
+
+
+Hs3001Driver::Status Hs3001Driver::read(uint16_t& humidity, int16_t& temperature)
+{
+    static uint8_t buffer[4];
+    uint32_t val;
+
+    _i2c.read(_address, reinterpret_cast<char*>(buffer), 1);
+
+    if ((buffer[0] & 0xC0) == 0x40) {
+        return STATUS_STALLED;
+    }
+
+    _i2c.read(_address, reinterpret_cast<char*>(buffer), 4);
+	val = (((uint32_t)buffer[0] & 0x3f) << 8) | (uint32_t)buffer[1];
+    humidity = (uint16_t)((val * 100 + 0x2000) / 0x3fff);
+
+    val = (((uint32_t)buffer[2]) << 6) | (((uint32_t)buffer[3]) >> 2);
+    temperature = (int16_t)(val * 16500 / 0x3fff) - 4000;
+
+//    printf("hs3001: raw=%08lx, h=0x%04x, t=0x%04x\n", *reinterpret_cast<uint32_t*>(buffer), humidity, temperature);
+    return STATUS_OK;
+}
+
+void Hs3001Driver::start_conversion(void)
+{
+    static char buffer = 0;
+     _i2c.write(_address, &buffer, 1);
+}
+