add degrC calculation

STM32/Tcalc/i2c.h

@@ -0,0 +1,39 @@
+/*
+ *                                                                                                  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.
+ *
+ */
+
+// timeout in ms
+#define I2C_TIMEOUT             (15)
+// CSB=1, address 1110110
+#define TSYS01_ADDR0            (0x76 << 1)
+// CSB=0, address 1110111
+#define TSYS01_ADDR1            (0x77 << 1)
+// registers: reset, read ADC value, start converstion, sart of PROM
+#define TSYS01_RESET            (0x1E)
+#define TSYS01_ADC_READ         (0x00)
+#define TSYS01_START_CONV       (0x48)
+#define TSYS01_PROM_ADDR0       (0xA0)
+// conversion time = 10ms
+#define CONV_TIME               (10)
+
+uint8_t read_i2c(uint8_t addr, uint32_t *data, uint8_t nbytes);
+uint8_t write_i2c(uint8_t addr, uint8_t data);