TOMB / Mbed 2 deprecated 0720_Lab4

0720_Lab4

Dependencies:   mbed

MCP4922.h@0:5de76211cf97, 2015-10-31 (annotated)

Committer:
chinetion
Date:
Sat Oct 31 11:00:33 2015 +0000
Revision:
0:5de76211cf97
Finish;

Who changed what in which revision?

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chinetion 0:5de76211cf97 1 /*
chinetion 0:5de76211cf97 2 * MCP4922 - DAC library.
chinetion 0:5de76211cf97 3 *
chinetion 0:5de76211cf97 4 * Copyright (c) 2011 Steven Beard, UK Astronomy Technology Centre.
chinetion 0:5de76211cf97 5 *
chinetion 0:5de76211cf97 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
chinetion 0:5de76211cf97 7 * of this software and associated documentation files (the "Software"), to deal
chinetion 0:5de76211cf97 8 * in the Software without restriction, including without limitation the rights
chinetion 0:5de76211cf97 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
chinetion 0:5de76211cf97 10 * copies of the Software, and to permit persons to whom the Software is
chinetion 0:5de76211cf97 11 * furnished to do so, subject to the following conditions:
chinetion 0:5de76211cf97 12 *
chinetion 0:5de76211cf97 13 * The above copyright notice and this permission notice shall be included in
chinetion 0:5de76211cf97 14 * all copies or substantial portions of the Software.
chinetion 0:5de76211cf97 15 *
chinetion 0:5de76211cf97 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
chinetion 0:5de76211cf97 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
chinetion 0:5de76211cf97 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
chinetion 0:5de76211cf97 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
chinetion 0:5de76211cf97 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
chinetion 0:5de76211cf97 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
chinetion 0:5de76211cf97 22 * THE SOFTWARE.
chinetion 0:5de76211cf97 23 */
chinetion 0:5de76211cf97 24
chinetion 0:5de76211cf97 25 #include "mbed.h"
chinetion 0:5de76211cf97 26
chinetion 0:5de76211cf97 27 #ifndef MCP4922_H
chinetion 0:5de76211cf97 28 #define MCP4922_H
chinetion 0:5de76211cf97 29
chinetion 0:5de76211cf97 30 /* Reference: Microchip Technology (2005), MCP4821/MCP4822 DAC Data Sheet. */
chinetion 0:5de76211cf97 31
chinetion 0:5de76211cf97 32 // MCP4922 reference voltage.
chinetion 0:5de76211cf97 33 //#define MCP4922_VREF 2048 // Reference voltage (mV)
chinetion 0:5de76211cf97 34 #define MCP4922_VREF 3300 // Reference voltage (mV)
chinetion 0:5de76211cf97 35
chinetion 0:5de76211cf97 36 /* Define possible combinations of 16-bit command register bits */
chinetion 0:5de76211cf97 37 #define MCP4922_REG_A1 0x3000 // Channel A gain 1
chinetion 0:5de76211cf97 38 #define MCP4922_REG_B1 0xB000 // Channel B gain 1
chinetion 0:5de76211cf97 39 #define MCP4922_REG_SHDN 0x0000 // Output power down
chinetion 0:5de76211cf97 40
chinetion 0:5de76211cf97 41 class MCP4922 {
chinetion 0:5de76211cf97 42 public:
chinetion 0:5de76211cf97 43
chinetion 0:5de76211cf97 44 MCP4922 (PinName mosi, PinName sclk, PinName cs);
chinetion 0:5de76211cf97 45
chinetion 0:5de76211cf97 46 ~MCP4922();
chinetion 0:5de76211cf97 47
chinetion 0:5de76211cf97 48 /*+
chinetion 0:5de76211cf97 49 * frequency: Set the SPI bus clock frequency in Hz.
chinetion 0:5de76211cf97 50 * The SPI bus frequency in Hz. Must be within the range
chinetion 0:5de76211cf97 51 * supported by both the SPI interface and the DAC chips
chinetion 0:5de76211cf97 52 * (~10 KHz to 20 MHz).
chinetion 0:5de76211cf97 53 */
chinetion 0:5de76211cf97 54 void frequency( int freq );
chinetion 0:5de76211cf97 55
chinetion 0:5de76211cf97 56 void writeA(int value );
chinetion 0:5de76211cf97 57
chinetion 0:5de76211cf97 58 void writeB(int value );
chinetion 0:5de76211cf97 59
chinetion 0:5de76211cf97 60 void write( int nchans, int values[], int gain=2, int latch=1 );
chinetion 0:5de76211cf97 61
chinetion 0:5de76211cf97 62 void latch_enable();
chinetion 0:5de76211cf97 63
chinetion 0:5de76211cf97 64 void latch_disable();
chinetion 0:5de76211cf97 65
chinetion 0:5de76211cf97 66 private:
chinetion 0:5de76211cf97 67
chinetion 0:5de76211cf97 68 MCP4922( const MCP4922& rhs );
chinetion 0:5de76211cf97 69
chinetion 0:5de76211cf97 70 void _init();
chinetion 0:5de76211cf97 71
chinetion 0:5de76211cf97 72 int _ndacs; // The number of DACS in the array
chinetion 0:5de76211cf97 73 int _latched; // Is the "not LDAC" pin used (1=yes; 0=no)?
chinetion 0:5de76211cf97 74 SPI _spi; // SPI bus object for communicating with DAC.
chinetion 0:5de76211cf97 75 DigitalOut** _ncs_array; // Array of pointers to DigitalOut objects
chinetion 0:5de76211cf97 76 // connected to "not CS" pins.
chinetion 0:5de76211cf97 77 DigitalOut* _nldac; // Pointer to DigitalOut object connected
chinetion 0:5de76211cf97 78 // to "not LDAC" pin (if any - NULL if none).
chinetion 0:5de76211cf97 79 };
chinetion 0:5de76211cf97 80
chinetion 0:5de76211cf97 81 #endif