![](/media/cache/group/NUCLEO-F411RE.JPG.50x50_q85.jpg)
สัญญาณ sine
Dependencies: mbed
Fork of MCP4922_Sinewave by
MCP4922.h
- Committer:
- soulx
- Date:
- 2015-08-24
- Revision:
- 2:2244c8986987
- Parent:
- 0:5737b1972549
File content as of revision 2:2244c8986987:
/* * MCP4922 - DAC library. * * Copyright (c) 2011 Steven Beard, UK Astronomy Technology Centre. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "mbed.h" #ifndef MCP4922_H #define MCP4922_H /* Reference: Microchip Technology (2005), MCP4821/MCP4822 DAC Data Sheet. */ // MCP4922 reference voltage. //#define MCP4922_VREF 2048 // Reference voltage (mV) #define MCP4922_VREF 3300 // Reference voltage (mV) /* Define possible combinations of 16-bit command register bits */ #define MCP4922_REG_A1 0x3000 // Channel A gain 1 #define MCP4922_REG_B1 0xB000 // Channel B gain 1 #define MCP4922_REG_SHDN 0x0000 // Output power down class MCP4922 { public: MCP4922 (PinName mosi, PinName sclk, PinName cs); ~MCP4922(); /*+ * frequency: Set the SPI bus clock frequency in Hz. * The SPI bus frequency in Hz. Must be within the range * supported by both the SPI interface and the DAC chips * (~10 KHz to 20 MHz). */ void frequency( int freq ); void writeA(int value ); void writeB(int value ); void write( int nchans, int values[], int gain=2, int latch=1 ); void latch_enable(); void latch_disable(); private: MCP4922( const MCP4922& rhs ); void _init(); int _ndacs; // The number of DACS in the array int _latched; // Is the "not LDAC" pin used (1=yes; 0=no)? SPI _spi; // SPI bus object for communicating with DAC. DigitalOut** _ncs_array; // Array of pointers to DigitalOut objects // connected to "not CS" pins. DigitalOut* _nldac; // Pointer to DigitalOut object connected // to "not LDAC" pin (if any - NULL if none). }; #endif