sw ADC SPI interface for the SOLID Slow control beta!!
SWSPI_BI.h
- Committer:
- wbeaumont
- Date:
- 2014-09-23
- Revision:
- 0:9efb460e962b
- Child:
- 1:01459a6ab296
File content as of revision 0:9efb460e962b:
/* SWSPI_BI, Software SPI library * Copyright (c) 2012-2014, David R. Van Wagner, http://techwithdave.blogspot.com * * 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. */ #ifndef SWSPI_BI_H #define SWSPI_BI_H /** A software implemented SPI that can use any digital pins * * Useful when don't want to share a single SPI hardware among attached devices * or when pinout doesn't match exactly to the target's SPI pins * * @code * #include "mbed.h" * #include "SWSPI_BI.h" * * SWSPI_BI spi(p5, p6, p7); // mosio, dir , sclk * * int main() * { * DigitalOut cs(p8); * spi.format(8, 0); * spi.frequency(10000000); * cs.write(0); * spi.write(0x9f); * int jedecid = (spi.write(0) << 16) | (spi.write(0) << 8) | spi.write(0); * cs.write(1); * } * @endcode */ class SWSPI_BI { private: DigitalInOut* msio; DigitalOut* ldir; DigitalOut* rdir; DigitalOut* sclk; int port; int bits; int mode; int polarity; // idle clock value int phase; // 0=sample on leading (first) clock edge, 1=trailing (second) int freq; public: /** Create SWSPI_BI object * * @param mosi_pin * @param miso_pin * @param sclk_pin */ SWSPI_BI(DigitalInOut *msio_pin, DigitalOut *rdir_pin,DigitalOut *ldir_pin, DigitalOut *sclk_pin); /** Destructor */ ~SWSPI_BI(); /** Specify SPI format * * @param bits 8 or 16 are typical values * @param mode 0, 1, 2, or 3 phase (bit1) and idle clock (bit0) */ void format(int bits, int mode = 0); /** Specify SPI clock frequency * * @param hz frequency (optional, defaults to 10000000) */ void frequency(int hz = 10000000); /** Write data and read result * * @param value data to write (see format for bit size) * @param DigitalOut cs line * @param lastdata this is the last data of a sequence, sets the cs high at the end * @param nxtrd : next cycle will be a read, set the LVDS interface to master in ( ADC out) */ void write(unsigned int value, DigitalOut * cs, bool lastdata, int cs_pol=0 ,bool nxtrd=false); unsigned int read( DigitalOut * cs, bool lastdata, int cs_pol=0 ); }; #endif // SWSPI_BI_H