sw SPI interface specific for the SOLID Slow control beta!!
Fork of SWSPI by
SWSPI.cpp
- Committer:
- wbeaumont
- Date:
- 2014-10-14
- Revision:
- 4:2a23c789bd1c
- Parent:
- 3:9c5ae1507a81
- Child:
- 5:75730aba1ce7
File content as of revision 4:2a23c789bd1c:
/* SWSPI, 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. */ #include <mbed.h> #include "SWSPI.h" #define SWSPI_SRC_VER "1.22" SWSPI::SWSPI(DigitalOut *mosi_pin, DigitalIn *miso_pin, DigitalOut *sclk_pin) :getVersion( SWSPI_HDR_VER , SWSPI_SRC_VER , __TIME__, __DATE__) { mosi = mosi_pin; miso = miso_pin; sclk = sclk_pin; format(8); frequency(); } SWSPI::~SWSPI() { } void SWSPI::format(int bits, int mode) { this->bits = bits; this->mode = mode; polarity = !((mode >> 1) & 1); phase = mode & 1; sclk->write(polarity); } void SWSPI::frequency(int hz) { this->freq = hz; } unsigned int SWSPI::write(unsigned int value) { int read = 0; //printf("SPI write %08X ",value); //wait(1.0/freq/2); for (int bit = bits-1; bit >= 0; --bit) { mosi->write(((value >> bit) & 0x01) == 0); if (phase == 0) { if (!miso->read()) read |= (1 << bit); } sclk->write(!polarity); //wait(1.0/freq/2); if (phase == 1) { if (!miso->read()) read |= (1 << bit); } sclk->write(polarity); //wait(1.0/freq/2); } //printf(" SPIR reads %08X \n\r" , read); return read; } #include "sscm_comm.h" /* unsigned short SWSPI::get_src_version_nr(){ return sscm_comm::get_hex_version_nr(SWSPI_SRC_VER); } // returns the version number of hdr of this module unsigned short SWSPI::get_hdr_version_nr(){ return sscm_comm::get_hex_version_nr(SWSPI_SRC_VER); } */