FRA221_4449 / Mbed 2 deprecated MCP4922_Sinewave_4449

labSPI

Dependencies:   mbed

Fork of MCP4922_Sinewave by FRA221_2015

MCP4922.h@0:5737b1972549, 2011-05-11 (annotated)

Committer:
jf1vrr
Date:
Wed May 11 12:04:37 2011 +0000
Revision:
0:5737b1972549
Child:
2:2244c8986987
Ver. 0.01A New 2011/05/11

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jf1vrr 0:5737b1972549 1 /*
jf1vrr 0:5737b1972549 2 * MCP4922 - DAC library.
jf1vrr 0:5737b1972549 3 *
jf1vrr 0:5737b1972549 4 * Copyright (c) 2011 Steven Beard, UK Astronomy Technology Centre.
jf1vrr 0:5737b1972549 5 *
jf1vrr 0:5737b1972549 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
jf1vrr 0:5737b1972549 7 * of this software and associated documentation files (the "Software"), to deal
jf1vrr 0:5737b1972549 8 * in the Software without restriction, including without limitation the rights
jf1vrr 0:5737b1972549 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
jf1vrr 0:5737b1972549 10 * copies of the Software, and to permit persons to whom the Software is
jf1vrr 0:5737b1972549 11 * furnished to do so, subject to the following conditions:
jf1vrr 0:5737b1972549 12 *
jf1vrr 0:5737b1972549 13 * The above copyright notice and this permission notice shall be included in
jf1vrr 0:5737b1972549 14 * all copies or substantial portions of the Software.
jf1vrr 0:5737b1972549 15 *
jf1vrr 0:5737b1972549 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jf1vrr 0:5737b1972549 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jf1vrr 0:5737b1972549 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
jf1vrr 0:5737b1972549 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jf1vrr 0:5737b1972549 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
jf1vrr 0:5737b1972549 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
jf1vrr 0:5737b1972549 22 * THE SOFTWARE.
jf1vrr 0:5737b1972549 23 */
jf1vrr 0:5737b1972549 24
jf1vrr 0:5737b1972549 25 #include "mbed.h"
jf1vrr 0:5737b1972549 26
jf1vrr 0:5737b1972549 27 #ifndef MCP4922_H
jf1vrr 0:5737b1972549 28 #define MCP4922_H
jf1vrr 0:5737b1972549 29
jf1vrr 0:5737b1972549 30 /* Reference: Microchip Technology (2005), MCP4821/MCP4822 DAC Data Sheet. */
jf1vrr 0:5737b1972549 31
jf1vrr 0:5737b1972549 32 // MCP4922 reference voltage.
jf1vrr 0:5737b1972549 33 #define MCP4922_VREF 2048 // Reference voltage (mV)
jf1vrr 0:5737b1972549 34 //#define MCP4922_VREF 3300 // Reference voltage (mV)
jf1vrr 0:5737b1972549 35
jf1vrr 0:5737b1972549 36 /* Define possible combinations of 16-bit command register bits */
jf1vrr 0:5737b1972549 37 #define MCP4922_REG_A1 0x3000 // Channel A gain 1
jf1vrr 0:5737b1972549 38 #define MCP4922_REG_B1 0xB000 // Channel B gain 1
jf1vrr 0:5737b1972549 39 #define MCP4922_REG_SHDN 0x0000 // Output power down
jf1vrr 0:5737b1972549 40
jf1vrr 0:5737b1972549 41 class MCP4922 {
jf1vrr 0:5737b1972549 42 public:
jf1vrr 0:5737b1972549 43
jf1vrr 0:5737b1972549 44 MCP4922 (PinName mosi, PinName sclk, PinName cs);
jf1vrr 0:5737b1972549 45
jf1vrr 0:5737b1972549 46 ~MCP4922();
jf1vrr 0:5737b1972549 47
jf1vrr 0:5737b1972549 48 /*+
jf1vrr 0:5737b1972549 49 * frequency: Set the SPI bus clock frequency in Hz.
jf1vrr 0:5737b1972549 50 * The SPI bus frequency in Hz. Must be within the range
jf1vrr 0:5737b1972549 51 * supported by both the SPI interface and the DAC chips
jf1vrr 0:5737b1972549 52 * (~10 KHz to 20 MHz).
jf1vrr 0:5737b1972549 53 */
jf1vrr 0:5737b1972549 54 void frequency( int freq );
jf1vrr 0:5737b1972549 55
jf1vrr 0:5737b1972549 56 void writeA(int value );
jf1vrr 0:5737b1972549 57
jf1vrr 0:5737b1972549 58 void writeB(int value );
jf1vrr 0:5737b1972549 59
jf1vrr 0:5737b1972549 60 void write( int nchans, int values[], int gain=2, int latch=1 );
jf1vrr 0:5737b1972549 61
jf1vrr 0:5737b1972549 62 void latch_enable();
jf1vrr 0:5737b1972549 63
jf1vrr 0:5737b1972549 64 void latch_disable();
jf1vrr 0:5737b1972549 65
jf1vrr 0:5737b1972549 66 private:
jf1vrr 0:5737b1972549 67
jf1vrr 0:5737b1972549 68 MCP4922( const MCP4922& rhs );
jf1vrr 0:5737b1972549 69
jf1vrr 0:5737b1972549 70 void _init();
jf1vrr 0:5737b1972549 71
jf1vrr 0:5737b1972549 72 int _ndacs; // The number of DACS in the array
jf1vrr 0:5737b1972549 73 int _latched; // Is the "not LDAC" pin used (1=yes; 0=no)?
jf1vrr 0:5737b1972549 74 SPI _spi; // SPI bus object for communicating with DAC.
jf1vrr 0:5737b1972549 75 DigitalOut** _ncs_array; // Array of pointers to DigitalOut objects
jf1vrr 0:5737b1972549 76 // connected to "not CS" pins.
jf1vrr 0:5737b1972549 77 DigitalOut* _nldac; // Pointer to DigitalOut object connected
jf1vrr 0:5737b1972549 78 // to "not LDAC" pin (if any - NULL if none).
jf1vrr 0:5737b1972549 79 };
jf1vrr 0:5737b1972549 80
jf1vrr 0:5737b1972549 81 #endif