Diff: MCP4922.h

Revision:

0:be25d2147046

diff -r 000000000000 -r be25d2147046 MCP4922.h
--- /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
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