Diff: MAX541.cpp

Revision:

1:3908aba2ea77

Parent:

0:4847beac14e9

--- a/MAX541.cpp	Mon Apr 22 21:18:58 2019 +0000
+++ b/MAX541.cpp	Thu May 09 01:18:42 2019 +0000
@@ -0,0 +1,84 @@
+/*******************************************************************************
+* 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.
+*******************************************************************************
+*/
+
+#include "MAX541.h"
+
+MAX541::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::~MAX541()
+{
+}
+
+void MAX541::Set_Voltage(double voltageV)
+{
+    if (voltageV >= VRef) {
+        Set_Code(max541codeFS);
+    } else if (voltageV <= 0.0f) {
+        Set_Code(0);
+    } else {
+        Set_Code(voltageV / VRef * max541codeFS);
+    }
+}
+
+double MAX541::Get_Voltage() const
+{
+    return (VRef * max541_code) / max541codeFS;
+}
+
+void MAX541::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;
+}
+
+uint16_t MAX541::Get_Code(void) const
+{
+    return max541_code;
+}