Half Duplex Version of SWSPI
Fork of SWSPI by
Revision 1:17d758fe52f8, committed 2018-06-19
- Comitter:
- martinsimpson
- Date:
- Tue Jun 19 09:55:18 2018 +0000
- Parent:
- 0:6a500a08c7fd
- Child:
- 2:70039cc8ba02
- Commit message:
- Fork of SWSPI first commit
Changed in this revision
--- a/SWSPI.cpp Tue Feb 04 06:54:01 2014 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,86 +0,0 @@ -/* 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" - -SWSPI::SWSPI(PinName mosi_pin, PinName miso_pin, PinName sclk_pin) -{ - mosi = new DigitalOut(mosi_pin); - miso = new DigitalIn(miso_pin); - sclk = new DigitalOut(sclk_pin); - format(8); - frequency(); -} - -SWSPI::~SWSPI() -{ - delete mosi; - delete miso; - delete sclk; -} - -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; -} - -int SWSPI::write(int value) -{ - int read = 0; - 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); - } - - return read; -} -
--- a/SWSPI.h Tue Feb 04 06:54:01 2014 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,95 +0,0 @@ -/* 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. - */ - -#ifndef SWSPI_H -#define SWSPI_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.h" - * - * SWSPI spi(p5, p6, p7); // mosi, miso, 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 -{ -private: - DigitalOut* mosi; - DigitalIn* miso; - 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 object - * - * @param mosi_pin - * @param miso_pin - * @param sclk_pin - */ - SWSPI(PinName mosi_pin, PinName miso_pin, PinName sclk_pin); - - /** Destructor */ - ~SWSPI(); - - /** 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) - * returns value read from device - */ - int write(int value); -}; - -#endif // SWSPI_H
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SWSPI_HD.cpp Tue Jun 19 09:55:18 2018 +0000 @@ -0,0 +1,89 @@ +/* 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_HD.h" + +SWSPI_HD::SWSPI_HD(PinName dio_pin, PinName sclk_pin) +{ + dio = new DigitalInOut(dio_pin); + sclk = new DigitalOut(sclk_pin); + format(8); + frequency(); +} + +SWSPI_HD::~SWSPI_HD() +{ + delete dio; + delete sclk; +} + +void SWSPI_HD::format(int bits, int mode) +{ + this->bits = bits; + this->mode = mode; + polarity = (mode >> 1) & 1; + phase = mode & 1; + sclk->write(polarity); +} + +void SWSPI_HD::frequency(int hz) +{ + this->freq = hz; +} + +int SWSPI_HD::write(int value) +{ + int read = 0; + for (int bit = bits-1; bit >= 0; --bit) + { + dio->output();// set as an OUTPUT + + dio->write(((value >> bit) & 0x01) != 0); + + dio->input();// set as an INPUT + + if (phase == 0) + { + + if (dio->read()) // was miso + read |= (1 << bit); + } + + sclk->write(!polarity); + + wait(1.0/freq/2); + + if (phase == 1) + { + if (dio->read()) // was miso + read |= (1 << bit); + } + + sclk->write(polarity); + + wait(1.0/freq/2); + } + + return read; +} +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SWSPI_HD.h Tue Jun 19 09:55:18 2018 +0000 @@ -0,0 +1,98 @@ +/* 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. + */ + +/* Based on above SWSPI credit as above + * This is now SWSPI_HD class type to provide single line data input output (dio) + * M. R. Simpson 19/06/2018 + */ + +#ifndef SWSPI_HD_H +#define SWSPI_HD_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_HD.h" + * + * SWSPI_HD spi(D8, D7); // dio, sclk (Using Arduino form factor Board (NUCLEO-32F401RE) + * + * int main() + * { + * DigitalOut cs(D6); + * 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_HD +{ +private: + DigitalInOut* dio; + 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_HD object + * + * @param dio + * @param sclk_pin + */ + SWSPI_HD(PinName dio_pin, PinName sclk_pin); + + /** Destructor */ + ~SWSPI_HD(); + + /** 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) + * returns value read from device + */ + int write(int value); +}; + +#endif // SWSPI_HD_H