MAX44000 Device Driver

Diff: MAX44000.cpp

Revision:

1:1a770989adcb

Parent:

0:b2219e6e444b

Child:

2:91f97c274e89

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX44000.cpp	Wed May 04 15:47:32 2016 +0000
@@ -0,0 +1,151 @@
+/*******************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *******************************************************************************
+ */
+
+#include "MAX44000.h"
+
+/***** Definitions *****/
+#define I2C_ADDR            (0x94) // 1001_010x
+
+//******************************************************************************
+MAX44000::MAX44000(PinName sda, PinName scl)
+{
+    i2c_ = new I2C(sda, scl);
+    i2c_owner = true;
+
+    i2c_->frequency(400000);
+}
+
+//******************************************************************************
+MAX44000::MAX44000(I2C *i2c) :
+    i2c_(i2c)
+{
+    i2c_owner = false;
+}
+
+//******************************************************************************
+MAX44000::~MAX44000()
+{
+    if(i2c_owner) {
+        delete i2c_;
+    }
+}
+
+//******************************************************************************
+int MAX44000::init(MAX44000::modes_t mode, MAX44000::alstim_t alstim, MAX44000::alspga_t alspga, MAX44000::drive_t drive)
+{
+    char data[2];
+
+    data[0] = REG_RX_CONFIG;
+    data[1] = 0xF0 | ((alstim & 0x03)<<2) | (alspga & 0x03);
+    if (i2c_->write(I2C_ADDR, data, 2) != 0) {
+        return -1;
+    }
+
+    data[0] = REG_TX_CONFIG;
+    data[1] = (drive & 0x0F);
+    if (i2c_->write(I2C_ADDR, data, 2) != 0) {
+        return -1;
+    }
+
+    data[0] = REG_MAIN_CONFIG;
+    data[1] = ((mode & 0x07)<<2);
+    if (i2c_->write(I2C_ADDR, data, 2) != 0) {
+        return -1;
+    }
+
+    return 0;
+}
+
+//******************************************************************************
+int MAX44000::writeReg(MAX44000::registers_t reg_addr, char reg_data)
+{
+    char data[2];
+
+    data[0] = reg_addr;
+    data[1] = reg_data;
+    if (i2c_->write(I2C_ADDR, data, 2) != 0) {
+        return -1;
+    }
+
+    return 0;
+}
+
+//******************************************************************************
+int MAX44000::readReg(MAX44000::registers_t reg_addr)
+{
+    char data;
+
+    data = reg_addr;
+    if (i2c_->write(I2C_ADDR, &data, 1, true) != 0) {
+        return -1;
+    }
+
+    if (i2c_->read(I2C_ADDR, &data, 1) != 0) {
+        return -1;
+    }
+
+    return (0x0 + data);
+}
+
+//******************************************************************************
+int MAX44000::readALS(void)
+{
+    char data;
+    int alsData;
+
+    data = REG_ALS_DATA_HIGH;
+    if (i2c_->write(I2C_ADDR, &data, 1, true) != 0) {
+        return -1;
+    }
+
+    if (i2c_->read(I2C_ADDR, &data, 1, true) != 0) {  // must use repeated start to protect low byte data
+        return -1;
+    }
+
+    if (data & 0x40) { // if the overflow bit is set
+        return -1;
+    }
+    
+    alsData = (data << 8);
+    data = REG_ALS_DATA_LOW;
+    if (i2c_->write(I2C_ADDR, &data, 1, true) != 0) {
+        return -1;
+    }
+
+    if (i2c_->read(I2C_ADDR, &data, 1) != 0) {
+        return -1;
+    }
+
+    alsData += data;
+    return alsData;
+}