B03 / Mbed 2 deprecated FRA221_lab5

lab5

Dependencies:   mbed

Fork of FRA221_lab5 by Wasuthorn Ausrivong

MCP4922.h@0:6e724cc2761b, 2017-11-23 (annotated)

Committer:
wonner163
Date:
Thu Nov 23 14:51:58 2017 +0000
Revision:
0:6e724cc2761b
lab5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wonner163 0:6e724cc2761b 1 /*
wonner163 0:6e724cc2761b 2 * MCP4922 - DAC library.
wonner163 0:6e724cc2761b 3 *
wonner163 0:6e724cc2761b 4 * Copyright (c) 2011 Steven Beard, UK Astronomy Technology Centre.
wonner163 0:6e724cc2761b 5 *
wonner163 0:6e724cc2761b 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
wonner163 0:6e724cc2761b 7 * of this software and associated documentation files (the "Software"), to deal
wonner163 0:6e724cc2761b 8 * in the Software without restriction, including without limitation the rights
wonner163 0:6e724cc2761b 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
wonner163 0:6e724cc2761b 10 * copies of the Software, and to permit persons to whom the Software is
wonner163 0:6e724cc2761b 11 * furnished to do so, subject to the following conditions:
wonner163 0:6e724cc2761b 12 *
wonner163 0:6e724cc2761b 13 * The above copyright notice and this permission notice shall be included in
wonner163 0:6e724cc2761b 14 * all copies or substantial portions of the Software.
wonner163 0:6e724cc2761b 15 *
wonner163 0:6e724cc2761b 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
wonner163 0:6e724cc2761b 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
wonner163 0:6e724cc2761b 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
wonner163 0:6e724cc2761b 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
wonner163 0:6e724cc2761b 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
wonner163 0:6e724cc2761b 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
wonner163 0:6e724cc2761b 22 * THE SOFTWARE.
wonner163 0:6e724cc2761b 23 */
wonner163 0:6e724cc2761b 24
wonner163 0:6e724cc2761b 25 #include "mbed.h"
wonner163 0:6e724cc2761b 26
wonner163 0:6e724cc2761b 27 #ifndef MCP4922_H
wonner163 0:6e724cc2761b 28 #define MCP4922_H
wonner163 0:6e724cc2761b 29
wonner163 0:6e724cc2761b 30 /* Reference: Microchip Technology (2005), MCP4821/MCP4822 DAC Data Sheet. */
wonner163 0:6e724cc2761b 31
wonner163 0:6e724cc2761b 32 // MCP4922 reference voltage.
wonner163 0:6e724cc2761b 33 //#define MCP4922_VREF 2048 // Reference voltage (mV)
wonner163 0:6e724cc2761b 34 #define MCP4922_VREF 3300 // Reference voltage (mV)
wonner163 0:6e724cc2761b 35
wonner163 0:6e724cc2761b 36 /* Define possible combinations of 16-bit command register bits */
wonner163 0:6e724cc2761b 37 #define MCP4922_REG_A1 0x3000 // Channel A gain 1
wonner163 0:6e724cc2761b 38 #define MCP4922_REG_B1 0xB000 // Channel B gain 1
wonner163 0:6e724cc2761b 39 #define MCP4922_REG_SHDN 0x0000 // Output power down
wonner163 0:6e724cc2761b 40
wonner163 0:6e724cc2761b 41 class MCP4922 {
wonner163 0:6e724cc2761b 42 public:
wonner163 0:6e724cc2761b 43
wonner163 0:6e724cc2761b 44 MCP4922 (PinName mosi, PinName sclk, PinName cs);
wonner163 0:6e724cc2761b 45
wonner163 0:6e724cc2761b 46 ~MCP4922();
wonner163 0:6e724cc2761b 47
wonner163 0:6e724cc2761b 48 /*+
wonner163 0:6e724cc2761b 49 * frequency: Set the SPI bus clock frequency in Hz.
wonner163 0:6e724cc2761b 50 * The SPI bus frequency in Hz. Must be within the range
wonner163 0:6e724cc2761b 51 * supported by both the SPI interface and the DAC chips
wonner163 0:6e724cc2761b 52 * (~10 KHz to 20 MHz).
wonner163 0:6e724cc2761b 53 */
wonner163 0:6e724cc2761b 54 void frequency( int freq );
wonner163 0:6e724cc2761b 55
wonner163 0:6e724cc2761b 56 void writeA(int value );
wonner163 0:6e724cc2761b 57
wonner163 0:6e724cc2761b 58 void writeB(int value );
wonner163 0:6e724cc2761b 59
wonner163 0:6e724cc2761b 60 void write( int nchans, int values[], int gain=2, int latch=1 );
wonner163 0:6e724cc2761b 61
wonner163 0:6e724cc2761b 62 void latch_enable();
wonner163 0:6e724cc2761b 63
wonner163 0:6e724cc2761b 64 void latch_disable();
wonner163 0:6e724cc2761b 65
wonner163 0:6e724cc2761b 66 private:
wonner163 0:6e724cc2761b 67
wonner163 0:6e724cc2761b 68 MCP4922( const MCP4922& rhs );
wonner163 0:6e724cc2761b 69
wonner163 0:6e724cc2761b 70 void _init();
wonner163 0:6e724cc2761b 71
wonner163 0:6e724cc2761b 72 int _ndacs; // The number of DACS in the array
wonner163 0:6e724cc2761b 73 int _latched; // Is the "not LDAC" pin used (1=yes; 0=no)?
wonner163 0:6e724cc2761b 74 SPI _spi; // SPI bus object for communicating with DAC.
wonner163 0:6e724cc2761b 75 DigitalOut** _ncs_array; // Array of pointers to DigitalOut objects
wonner163 0:6e724cc2761b 76 // connected to "not CS" pins.
wonner163 0:6e724cc2761b 77 DigitalOut* _nldac; // Pointer to DigitalOut object connected
wonner163 0:6e724cc2761b 78 // to "not LDAC" pin (if any - NULL if none).
wonner163 0:6e724cc2761b 79 };
wonner163 0:6e724cc2761b 80
wonner163 0:6e724cc2761b 81 #endif