Revision 0:8002303900e6, committed 2018-07-03

Comitter:

phonemacro

Date:

Tue Jul 03 20:09:09 2018 +0000

Child:

1:a5d963a3c298

Commit message:

Maxim Integrated 7-bit Sink/Source Current DAC. Driver/library for DS4424, DS4422 Input/Ouput Current DAC (Digital-to-Analog Converter).

Changed in this revision

--- /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;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DS4424.h	Tue Jul 03 20:09:09 2018 +0000
@@ -0,0 +1,196 @@
+/*******************************************************************************
+* @file DS4424.h
+* 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.
+*******************************************************************************
+*/
+#ifndef DS4424_H
+#define DS4424_H
+ 
+#include "mbed.h"
+
+#define DS4424_NO_ERROR   0
+#define DS4424_ERROR      -1
+
+#define DS4424_MAX_DAC_CHANNELS 4
+#define DS4422_MAX_DAC_CHANNELS 2
+
+#define DS4424_DAC_ADDR(chan)   ((chan) + 0xf8)
+#define DS4424_SOURCE_I     1
+#define DS4424_SINK_I       0
+
+/**
+ * @brief DS4424 Four/two Channel I2C Sink/Source Current DAC
+ * @details The DS4424/DS422 contains four/two I2C
+ * programmable current DACs. This driver enables
+ * the writing of source/since values to the channel
+ * registers.
+ * <br>https://www.maximintegrated.com/en/products/analog/data-converters/digital-to-analog-converters/DS4424.html
+ *  @version 1.0000.0
+ * @code 
+ * #include "mbed.h"
+ * #include "DS4424.h"
+ * #include "max32630fthr.h"
+ * MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
+ * I2C i2cBus(P3_4, P3_5);
+ * DS4424 ds4424_dac(i2cBus, DS4424::DS4424_I2C_SLAVE_ADRS0, DS4424::DS4424_IC);
+    
+ * int main()
+ * {
+ *    int32_t value[4]={0,0,0,0};
+ *    int ret;
+ *    
+ *    i2cBus.frequency(400000);
+ *
+ *    // read channel 0 register
+ *    ret = ds4424_dac.readRaw(value[0], DS4424::REG_OUT0); 
+ *
+ *      //... rest of application
+ * }
+ * @endcode
+ */
+
+class DS4424
+{
+    public:
+    
+
+    /**
+    * @brief IC's supported with this driver
+    * @details DS4424, DS4422
+    */ 
+    typedef enum
+    {
+        DS4424_IC = 0,
+        DS4422_IC
+    }DS4424_ic_t;
+    
+    
+    /**
+    * @brief Valid 7-bit I2C addresses 
+    * @details The 8 valid I2C addresses set via A0, and A1 pins
+    * of the DS4424
+    */ 
+    typedef enum
+    {
+        DS4424_I2C_SLAVE_ADRS0 = (int32_t)(0x20 >> 1), // code uses the 7 bit address
+        DS4424_I2C_SLAVE_ADRS1 = (int32_t)(0x60 >> 1),
+        DS4424_I2C_SLAVE_ADRS2 = (int32_t)(0xA0 >> 1),
+        DS4424_I2C_SLAVE_ADRS3 = (int32_t)(0xe0 >> 1) 
+    }DS4424_i2c_adrs_t;
+
+    
+    /**
+    * @brief   Register Addresses
+    * @details Enumerated MAX20303 register addresses
+    */
+    enum ChannelRegAddr_e {
+        REG_OUT0            = 0xF8,  // channel 0
+        REG_OUT1            = 0xF9,
+        REG_OUT2            = 0xFA,
+        REG_OUT3            = 0xFB
+    };
+
+    
+    /**********************************************************//**
+    * @brief Constructor for DS4424 Class.  
+    * 
+    * @details Allows user to use existing I2C object
+    *
+    * On Entry:
+    *     @param[in] i2c_bus - pointer to existing I2C object
+    *     @param[in] i2c_adrs - 7-bit slave address of DS4424
+    *     @param[in] ic_variant - which type of DS44xx is used
+    *
+    * On Exit:
+    *
+    * @return None
+    **************************************************************/
+    DS4424(I2C &i2c_bus, DS4424_i2c_adrs_t slaveAddress, DS4424_ic_t ic_variant);
+    
+    
+ 
+    /**********************************************************//**
+    * @brief Default destructor for DS4424 Class.  
+    *
+    * @details Destroys I2C object if owner 
+    *
+    * On Entry:
+    *
+    * On Exit:
+    *
+    * @return None
+    **************************************************************/
+    ~DS4424();
+    
+/** 
+    * @brief Read raw value of a channel. Negative values are sink; Positive values are source.
+    * @param result - Value that is read from the register
+    * @param chan_addr - Channel 0 to 3
+    * @return 0 on success, non-zero on failure
+    */
+    int readRaw(int32_t &result, ChannelRegAddr_e chan_addr);
+    
+ /** 
+    * @brief Write raw value to a channel.
+    * @param value - Value that is stored to the register
+    * @param chan_addr - Channel 0 to 3
+    * @return 0 on success, non-zero on failure
+    */
+    int writeRaw(int32_t value, ChannelRegAddr_e chan_addr);
+
+protected:
+
+    /**
+    * @brief  Read register of device at slave address
+    * @param reg - Register address
+    * @param[out] value - Read data on success
+    * @return 0 on success, non-zero on failure
+    */
+    int readRegister(ChannelRegAddr_e reg, uint8_t &value);
+
+    /** 
+    * @brief Write register of device at slave address
+    * @param reg - Register address
+    * @param value - Value to write
+    * @return 0 on success, non-zero on failure
+    */
+    int writeRegister(ChannelRegAddr_e reg, uint8_t value);
+ 
+private:
+    /// I2C object
+    I2C &m_i2c;
+    /// Device slave addresses
+    uint8_t m_writeAddress, m_readAddress;
+    /// Address of the Maximum Register for this device
+    ChannelRegAddr_e m_max_ch_reg_addr;
+};
+ 
+#endif/* DS4424_H */
\ No newline at end of file