Diff: DS4424.cpp

Revision:

0:8002303900e6

Child:

1:a5d963a3c298

diff -r 000000000000 -r 8002303900e6 DS4424.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DS4424.cpp	Tue Jul 03 20:09:09 2018 +0000
@@ -0,0 +1,171 @@
+/*******************************************************************************
+* Copyright (C) 2018 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 "DS4424.h"
+
+/*
+ * DS4424 DAC control register 8 bits
+ * [7]      0: to sink; 1: to source
+ * [6:0]    steps to sink/source
+ * bit[7] looks like a sign bit, but the value of the register is
+ * not a two's complement code considering the bit[6:0] is a absolute
+ * distance from the zero point.
+ */
+union ds4424_raw_data {
+    struct {
+        uint8_t dx:7;
+        uint8_t source_bit:1;
+    };
+    uint8_t bits;
+};
+ 
+//******************************************************************************
+
+DS4424::DS4424(I2C &i2c_bus, DS4424_i2c_adrs_t slaveAddress, DS4424_ic_t ic_variant):
+m_i2c(i2c_bus), 
+m_writeAddress(slaveAddress <<1),
+m_readAddress ((slaveAddress << 1) | 1)
+{
+    switch(ic_variant) {
+       case DS4424_IC:
+            m_max_ch_reg_addr = REG_OUT3;
+            break;
+        case DS4422_IC:
+            m_max_ch_reg_addr = REG_OUT1;
+            break;
+        default:
+            m_max_ch_reg_addr = REG_OUT3;
+            break;
+    }
+}
+ 
+ 
+//******************************************************************************
+DS4424::~DS4424(void) 
+{
+  //empty block
+}
+ 
+ 
+//******************************************************************************
+int DS4424::readRaw(int32_t &result, ChannelRegAddr_e chan_addr) 
+{
+    uint8_t value;
+    int ret = DS4424_ERROR;
+    union ds4424_raw_data raw;
+    
+    if (chan_addr >= REG_OUT0 && chan_addr <=  m_max_ch_reg_addr)
+        ret = readRegister(chan_addr, value);
+    if (ret != 0)
+        return DS4424_ERROR;
+    
+
+    raw.bits = value;
+    result = raw.dx;
+    if (raw.source_bit == DS4424_SINK_I)    // Sinking will be negative values
+        result = -result;
+    return DS4424_NO_ERROR;
+
+}
+
+
+//******************************************************************************
+int DS4424::writeRaw(int32_t value, ChannelRegAddr_e chan_addr) 
+{
+    #define U8_MAX     ((uint8_t)~0U)
+    #define S8_MAX     ((int8_t)(U8_MAX>>1))
+    #define S8_MIN     ((int8_t)(-S8_MAX - 1))
+    int ret = DS4424_ERROR;
+    union ds4424_raw_data raw;
+    
+    if ((chan_addr >= REG_OUT0 && chan_addr <=  m_max_ch_reg_addr) &&
+        (value >= S8_MIN && value <= S8_MAX)) {
+        if (value > 0) {
+            raw.source_bit = DS4424_SOURCE_I;
+            raw.dx = value;
+        } else {
+            raw.source_bit = DS4424_SINK_I;
+            raw.dx = -value;
+        }
+        ret = writeRegister(chan_addr, raw.bits);
+ 
+        if (ret != 0)
+            return DS4424_ERROR;
+        return DS4424_NO_ERROR;
+    } else {
+        return DS4424_ERROR;
+    }
+}
+
+ 
+//******************************************************************************
+int DS4424::readRegister(ChannelRegAddr_e reg, uint8_t &value) 
+{
+    int32_t ret;
+ 
+    char data = reg;
+ 
+    ret = m_i2c.write(m_writeAddress, &data, sizeof(data));
+    if (ret != 0) {
+        printf("%s - failed - ret: %d reg: %d data: %d sizeof(data): %d\r\n", __func__, ret, (int)reg, data, sizeof(data));
+        return DS4424_ERROR;
+    }
+ 
+    ret = m_i2c.read(m_readAddress, &data, sizeof(data));
+    if (ret != 0) {
+        printf("%s - failed - ret: %d\r\n", __func__, ret);
+        return DS4424_ERROR;
+    }
+
+    value = data;
+    return DS4424_NO_ERROR;
+
+}
+
+
+//******************************************************************************
+int DS4424::writeRegister(ChannelRegAddr_e reg, uint8_t value)
+{
+    
+    int32_t ret;
+ 
+    char cmdData[] = {static_cast<char>(reg), static_cast<char>(value)};
+ 
+    ret = m_i2c.write(m_writeAddress, cmdData, sizeof(cmdData));
+
+    if (ret != 0)
+        return DS4424_ERROR;
+ 
+    return DS4424_NO_ERROR;
+}