Revision 0:be25d2147046, committed 2017-09-25

Comitter:

AkinoriHashimoto

Date:

Mon Sep 25 05:48:38 2017 +0000

Commit message:

MCP4922 Lib.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4922.cpp	Mon Sep 25 05:48:38 2017 +0000
@@ -0,0 +1,156 @@
+#include "MCP4922.h"
+
+// **** Constructor & destructor ****
+// With LathPin
+MCP4922::MCP4922(PinName mosi, PinName sck, PinName _cs, PinName _latch)
+    : p_spi(new SPI(mosi, NC, sck)), spi(*p_spi), cs(_cs, 1), latch(_latch, 1)
+{
+    useLPin= true;  //Latch pin
+}
+MCP4922::MCP4922(SPI &_spi, PinName _cs, PinName _latch)
+    : p_spi(NULL), spi(_spi), cs(_cs, 1), latch(_latch, 1)
+{
+    useLPin= true;  //Latch pin
+}
+// W/O LatchPin
+MCP4922::MCP4922(PinName mosi, PinName sck, PinName _cs)
+    : p_spi(new SPI(mosi, NC, sck)), spi(*p_spi), cs(_cs, 1), latch(NC)
+{
+    useLPin= false;  //Latch pin
+}
+MCP4922::MCP4922(SPI &_spi, PinName _cs)
+    : p_spi(NULL), spi(_spi), cs(_cs, 1), latch(NC)
+{
+    useLPin= false;  //Latch pin
+}
+MCP4922::~MCP4922()
+{
+    if(p_spi != NULL)
+        delete p_spi;
+}
+
+// **** INIT Config ****
+MCP4922::ERR MCP4922::init(int hz, int gainA, int gainB, bool bufA, bool bufB)
+{
+    // valA/B init.
+//    valA= 0x0000;   // bit15 : 0
+//    valB= 0x8000;   // bit15 : 1
+
+    if(hz <= 0 || 20000000 < hz)
+        return ERR_HZ;
+    spi.frequency(hz);
+    spi.format(16);  // 16bit, mode=0
+
+    _bufA= bufA;
+    _bufB= bufB;
+//    valA |= (_bufA << 14);  // if ture; |= 0x0400
+//    valB |= (_bufB << 14);
+
+    if(!(gainA==1 || gainA==2))
+        return ERR_GAIN;
+    if(!(gainB==1 || gainB==2))
+        return ERR_GAIN;
+    _gainA= (gainA==1) ? true : false;  // false=0: 2x
+    _gainB= (gainB==1) ? true : false;  // false=0: 2x
+//    valA |= (_gainA << 13);
+//    valB |= (_gainB << 13);
+
+    // bit12; ShatDown=0
+//    valA |= (1 << 12);
+//    valB |= (1 << 12);
+    valA= 0x0000+ (_bufA << 14)+ (_gainA << 13)+ 0x1000;
+    valB= 0x8000+ (_bufB << 14)+ (_gainB << 13)+ 0x1000;
+
+    return SUCCESS;
+}
+
+
+void MCP4922::setVal(int valA, int valB)
+{
+    this->setVal(chA, valA);
+    this->setVal(chB, valB);
+    this->write();
+    return;
+}
+
+void MCP4922::setVal(float valA, float valB)
+{
+    int a= (int)(valA*4095.0+ 0.5);
+    int b= (int)(valB*4095.0+ 0.5);
+    this->setVal(a, b);
+    return;
+}
+
+void MCP4922::setVal(CH ch, int val)
+{
+    /*    if(val < 0 || 4096 < val)
+            return ERR_VAL;*/
+    if(val < 0)
+        val= 0;
+    if(4096 < val)
+        val= 4095;
+
+    uint16_t tmp= val;    // bit0-bit11; 1B+4b
+    if(ch == chA) {
+        valA &= 0xf000;
+        valA |= tmp;
+    } else {
+        valB &= 0xf000;
+        valB |= tmp;
+    }
+    return;
+}
+
+void MCP4922::setVal(CH ch, float val)
+{
+    /*    if(val < 0.0 || 1.0 < val)
+            return ERR_VAL;*/
+    if(val < 0.0)
+        val= 0.0;
+    if(1.0 < val)
+        val= 1.0;
+
+    this->setVal(ch, (int)(val*4095.0+ 0.5));
+    return;
+}
+
+void MCP4922::write()
+{
+    this->_write(valA);
+    this->_write(valB);
+    this->update();
+    return;
+}
+
+void MCP4922::write(CH ch, bool latch)
+{
+    uint16_t val;
+    if(ch == chA)
+        val= valA;
+    else
+        val= valB;
+    _write(val);
+
+    if(!latch)
+        update();
+
+    return;
+}
+
+void MCP4922::_write(uint16_t val)
+{
+    latch= 1;
+    cs= 0;
+    spi.write(val);
+    cs= 1;
+    return;
+}
+
+void MCP4922::update()
+{
+    if(latch == NULL)
+        return;
+    latch= 0;
+}
+
+// EOF
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4922.h	Mon Sep 25 05:48:38 2017 +0000
@@ -0,0 +1,109 @@
+/**
+ *
+ * 12bit Resolution. Dual-channel and Rail-to-Rail Output.
+ * SPI Interface with 20MHz. Latching Dual output with LDAC.
+ * Seting time of 4.5us. Selectable 1x or 2x Gain.
+ * Vdd supplied 2.7 to 5.5V, Vref < Vdd.
+ * LDAC setup time: 40ns, pulse: 100ns.
+ */
+
+/** @code
+
+ * @endcode
+ */
+ 
+#pragma once
+
+#include "mbed.h"
+
+class MCP4922{
+public:
+    // With LatchPin
+    /** Constructor; 
+     *  @param mosi, sck, cs, latch
+    */
+    MCP4922(PinName mosi, PinName sck, PinName _cs, PinName _latch);
+    /** Constructor; 
+     *  @param spi's ptr, cs, latch
+    */
+    MCP4922(SPI &_spi, PinName _cs, PinName _latch);
+    
+    // W/O LatchPin
+    /** Constructor; 
+     *  @param mosi, sck, cs
+    */
+    MCP4922(PinName mosi, PinName sck, PinName _cs);
+    /** Constructor; 
+     *  @param spi's ptr, cs
+    */
+    MCP4922(SPI &_spi, PinName _cs);
+    ~MCP4922();
+//  ******************** enable printf() future of C-language. ****************
+    
+    enum ERR{
+        SUCCESS, ERR_HZ, ERR_GAIN, ERR_VAL
+    };
+    enum CH{
+        chA, chB
+    };
+    
+    /** ESENTIAL FUNC.; Initialize Configlation.
+     *
+     * @param hz; freq. of SPI.
+     * @param gainA/B; output gain select 1x|2x. Vref*gain.
+     * @param bufA/B; Normally off(false); Buffered= true;
+     */
+    MCP4922::ERR init(int hz= 20000000, int gainA= 1, int gainB= 1, 
+        bool bufA= false, bool bufB= false);
+    
+    /** Set Value
+     * @param A, B; 0-4095 (12bit)
+     */
+    void setVal(int valA, int valB);
+    
+    /** Set Value
+     * @param A, B; 0.0f-1.0f (12bit)
+     */
+    void setVal(float valA, float valB);
+    
+    /** Set Value
+     * @param val; 0-4095 (12bit)
+     */
+    void setVal(CH ch, int val);
+    
+    /** Set Value
+     * @param val; 0.0f-1.0f (12bit)
+     */
+    void setVal(CH ch, float val);
+
+    /** Write ALL with update-output(latch off).
+     */
+    void write();
+    
+    /** Write
+     */
+    void write(CH ch, bool latch= true);
+    
+    /** Update
+     */
+    void update();
+
+private:
+    // using i2c
+    SPI *p_spi;
+    SPI &spi;
+    DigitalOut cs;
+    DigitalOut latch;
+    
+    bool _bufA, _bufB, _gainA, _gainB;
+  
+    uint16_t  valA, valB;
+//    bitset<16> valA(0);  // 16bit 2Byte.
+//    bitset<16> valB(0);  // 16bit 2Byte.
+    
+    void _write(uint16_t val);
+    
+    bool useLPin;
+};
+
+// EOF
\ No newline at end of file