1 files changed, 92 insertions, 0 deletions
diff --git a/temp.c b/temp.c
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+++ b/temp.c
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+/**
+ * @file temp.c
+ * Provides support for the TMP006 temperature sensor.
+ *
+ * Copyright (C) 2019  Clyne Sullivan
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "board.h"
+#include "i2c.h"
+
+// TMP006 I2C address
+#define TEMP_ADDR (0x40)
+
+// TMP006 registers
+#define TMP006_CONFIG (0x02)
+#define TMP006_VOBJ   (0x00)
+#define TMP006_TAMB   (0x01)
+#define TMP006_MANID  (0xFE)
+#define TMP006_DEVID  (0xFF)
+
+// TMP006 CONFIG register parameters
+#define TMP006_CFG_RESET    (0x8000)
+#define TMP006_CFG_MODEON   (0x7000)
+#define TMP006_CFG_1SAMPLE  (0x0000)
+#define TMP006_CFG_2SAMPLE  (0x0200)
+#define TMP006_CFG_4SAMPLE  (0x0400)
+#define TMP006_CFG_8SAMPLE  (0x0600)
+#define TMP006_CFG_16SAMPLE (0x0800)
+#define TMP006_CFG_DRDYEN   (0x0100)
+#define TMP006_CFG_DRDY     (0x0080)
+
+static void tempI2CWrite(uint8_t reg, uint16_t value);
+static uint16_t tempI2CRead(uint8_t reg);
+
+int tempInit(void)
+{
+	// Prepare I2C
+	I2C_init(TEMP_ADDR);
+
+	// Initialize the TMP006 sensor
+	tempI2CWrite(TMP006_CONFIG, TMP006_CFG_MODEON | TMP006_CFG_DRDYEN |
+		TMP006_CFG_16SAMPLE);
+
+	// Check that the device is in fact the TMP006
+	uint16_t manid = tempI2CRead(TMP006_MANID);
+	uint16_t devid = tempI2CRead(TMP006_DEVID);
+	if (manid != 0x5449 || devid != 0x67)
+		return 1;
+
+	return 0;
+}
+
+int16_t tempGetDieTemperature(void)
+{
+    int16_t raw = tempI2CRead(TMP006_TAMB);
+    return (raw >> 2) / 32;
+}
+
+void tempI2CWrite(uint8_t reg, uint16_t value)
+{
+	uint8_t data[3] = {
+		reg,
+		value >> 8,
+		value & 0xFF
+	};
+	I2C_write(3, data);
+}
+
+uint16_t tempI2CRead(uint8_t reg)
+{
+	uint8_t data[2] = {
+		reg,
+		0
+	};
+	I2C_write(1, data);
+	I2C_read(2, data);
+	return (data[0] << 8) | data[1];
+}
+