Diff: MAX541.h

Revision:

0:4847beac14e9

Child:

1:3908aba2ea77

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX541.h	Mon Apr 22 21:18:58 2019 +0000
@@ -0,0 +1,105 @@
+/*******************************************************************************
+* Copyright (C) 2019 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.
+*******************************************************************************
+*/
+
+class MAX541 {
+public:
+    MAX541(SPI &spi, DigitalOut &cs_pin)
+        : m_spi(spi), m_cs_pin(cs_pin) // SPI interface
+    {
+        VRef = 3.3f;
+        m_cs_pin = 1;
+
+        m_SPI_dataMode = 0; // SPI_MODE0: CPOL=0,CPHA=0: Rising Edge stable; SCLK idle Low
+        m_spi.format(8,m_SPI_dataMode);         // int bits_must_be_8, int mode=0_3 CPOL=0,CPHA=0
+        m_SPI_SCLK_Hz = 4000000; // 4MHz
+        m_spi.frequency(m_SPI_SCLK_Hz);
+    }
+    ~MAX541()
+    {
+    }
+
+private:
+    // SPI object
+    SPI &m_spi;
+    int m_SPI_SCLK_Hz;
+    int m_SPI_dataMode;
+
+    // Selector pin object
+    DigitalOut &m_cs_pin;
+
+public:
+    double VRef;
+    const float max541codeFS = (float)((uint32_t)0xffff);
+    uint16_t max541_code;
+
+    // set the MAX541 output voltage
+    void Set_Voltage(double voltageV)
+    {
+        if (voltageV >= VRef) {
+            Set_Code(max541codeFS);
+        }
+        else if (voltageV <= 0.0f) {
+            Set_Code(0);
+        }
+        else {
+            Set_Code(voltageV / VRef * max541codeFS);
+        }
+    }
+
+    // get the MAX541 output voltage
+    double Get_Voltage() const
+    {
+        return (VRef * max541_code) / max541codeFS;
+    }
+
+    // set the MAX541 output code
+    void Set_Code(int16_t max541_mosiData16)
+    {
+        max541_code = (uint16_t)max541_mosiData16;
+        size_t max541_byteCount = 2;
+        static char max541_mosiData[2];
+        static char max541_misoData[2];
+        max541_mosiData[0] = (char)((max541_mosiData16 >> 8) & 0xFF); // MSByte
+        max541_mosiData[1] = (char)((max541_mosiData16 >> 0) & 0xFF); // LSByte
+        m_cs_pin = 0;
+        m_spi.write(max541_mosiData, max541_byteCount, max541_misoData, max541_byteCount);
+        m_cs_pin = 1;
+    }
+
+    // get the MAX541 output code
+    uint16_t Get_Code(void) const
+    {
+        return max541_code;
+    }
+
+};