Diff: bq35100.cpp

Revision:

0:cec745c014b7

Child:

1:ee7cc8d75283

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bq35100.cpp	Mon Jul 03 16:12:22 2017 +0000
@@ -0,0 +1,126 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 u-blox
+ *
+ * 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.
+ */
+
+/**
+ * @file bq35100.cpp
+ * This file defines the API to the TI BQ35100 battery gauge chip.
+ */
+
+/** Define these to print debug information. */
+//#define DEBUG_BQ35100
+
+#include <mbed.h>
+#include <battery_gauge_bq35100.h>
+
+#ifdef DEBUG_BQ35100
+# include <stdio.h>
+#endif
+
+// ----------------------------------------------------------------
+// COMPILE-TIME MACROS
+// ----------------------------------------------------------------
+
+// ----------------------------------------------------------------
+// PRIVATE VARIABLES
+// ----------------------------------------------------------------
+
+// ----------------------------------------------------------------
+// GENERIC PRIVATE FUNCTIONS
+// ----------------------------------------------------------------
+
+// Read two bytes from an address.
+// Note: gpI2c should be locked before this is called.
+bool BatteryGaugeBq35100::getTwoBytes (uint8_t registerAddress, uint16_t *pBytes)
+{
+    bool success = false;
+    char data[3];
+
+    if (gpI2c != NULL) {
+        // Send a command to read from registerAddress
+        data[0] = registerAddress;
+        data[1] = 0;
+        data[2] = 0;
+
+        if ((gpI2c->write(gAddress, &(data[0]), 1) == 0) &&
+            (gpI2c->read(gAddress, &(data[1]), 2) == 0)) {
+            success = true;
+            if (pBytes) {
+                *pBytes = (((uint16_t) data[2]) << 8) + data[1];
+            }
+        }
+    }
+
+    return success;
+}
+
+//----------------------------------------------------------------
+// PUBLIC FUNCTIONS
+// ----------------------------------------------------------------
+
+// Constructor.
+BatteryGaugeBq35100::BatteryGaugeBq35100(void)
+{
+    gpI2c = NULL;
+    gReady = false;
+    gGaugeOn = false;
+    gSealCode = 0;
+}
+
+// Destructor.
+BatteryGaugeBq35100::~BatteryGaugeBq35100(void)
+{
+}
+
+// Initialise ourselves.
+bool BatteryGaugeBq35100::init (I2C * pI2c, uint8_t address, uint16_t sealCode)
+{
+    uint16_t answer;
+    char data[4];
+
+    gpI2c = pI2c;
+    gAddress = address << 1;
+    gSealCode = sealCode;
+
+    if (gpI2c != NULL) {
+        gpI2c->lock();
+        
+        // Send a control command to read the firmware version
+        data[0] = 0x00;  // Set address to first register for control
+        data[1] = 0x02;  // First byte of FW_VERSION sub-command (0x02)
+        data[2] = 0x00;  // Second byte of FW_VERSION sub-command (0x00) (register address will auto-increment)
+
+        if (gpI2c->write(gAddress, &(data[0]), 3) == 0) {
+            if (getTwoBytes (0, &answer)) {
+#ifdef DEBUG_BQ35100
+                printf("BatteryGaugeBq35100 (I2C 0x%02x): read 0x%04x as FW_VERSION, expected 0x0109.\n", gAddress >> 1, answer);
+#endif
+            }
+        }
+        gpI2c->unlock();
+    }
+
+#ifdef DEBUG_BQ35100
+    if (gReady) {
+        printf("BatteryGaugeBq35100 (I2C 0x%02x): handler initialised.\r\n", gAddress >> 1);
+    } else {
+        printf("BatteryGaugeBq35100 (I2C 0x%02x): init NOT successful.\r\n", gAddress >> 1);
+    }
+#endif
+
+    return gReady;
+}
+
+/* End Of File */