restructuring

F0:F030,F042,F072/htu21d_nucleo/i2c.h

@@ -0,0 +1,44 @@
+/*
+ *                                                                                                  geany_encoding=koi8-r
+ * i2c.h
+ *
+ * Copyright 2017 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ */
+
+#define HTU21_ADDR          (0x40 << 1)
+#define HTU21_READ_TEMP     (0xF3)
+#define HTU21_READ_HUMID    (0xF5)
+#define HTU21_READ_REG      (0xE7)
+#define HTU21_WRITE_REG     (0xE6)
+#define HTU21_SOFT_RESET    (0xFE)
+// user reg fields
+#define HTU21_REG_VBAT      (0x40)
+#define HTU21_REG_D1        (0x80)
+#define HTU21_REG_D0        (0x01)
+#define HTU21_REG_HTR       (0x04)
+#define HTU21_REG_ODIS      (0x02)
+
+void i2c_setup();
+
+int16_t convert_temperature(uint16_t in);
+int16_t convert_humidity(uint16_t in);
+uint8_t htu_write_reg(uint8_t data);
+uint8_t htu_read_reg(uint8_t *data);
+uint8_t htu_read_i2c(uint16_t *data);
+uint8_t htu_write_i2c(uint8_t data);