Jonne Valola / PokittoLib Featured

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

Dependents:   YATTT sd_map_test cPong SnowDemo ... more

PokittoLib

Library for programming Pokitto hardware

How to Use

  1. Import this library to online compiler (see button "import" on the right hand side
  2. DO NOT import mbed-src anymore, a better version is now included inside PokittoLib
  3. Change My_settings.h according to your project
  4. Start coding!

POKITTO_HW/SoftwareI2C.h

Committer:
Pokitto
Date:
2019-12-25
Revision:
71:531419862202
Parent:
31:f4b9b85c7b62

File content as of revision 71:531419862202:

/*
 * mbed Library to use a software master i2c interface on any GPIO pins
 * Copyright (c) 2012 Christopher Pepper
 * Released under the MIT License: http://mbed.org/license/mit
 */

#ifndef _SOFTWARE_I2C_H_
#define _SOFTWARE_I2C_H_

#include "mbed.h"

/**
  * @brief SoftwareI2C class
  */

class SoftwareI2C {
public:
    SoftwareI2C(PinName sda, PinName scl);
    ~SoftwareI2C();

    void read(uint8_t device_address, uint8_t* data, uint8_t data_bytes);
    void write(uint8_t device_address, uint8_t* data,  uint8_t data_bytes);
    void write(uint8_t device_address, uint8_t byte);
    void randomRead(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes);
    void randomWrite(uint8_t device_address, uint8_t start_address, uint8_t* data, uint8_t data_bytes);
    void randomWrite(uint8_t device_address, uint8_t start_address, uint8_t byte);

    uint8_t read8(uint8_t device_address, uint8_t start_address);
    uint16_t read16(uint8_t device_address, uint8_t start_address);
    uint32_t read24(uint8_t device_address, uint8_t start_address);
    uint32_t read32(uint8_t device_address, uint8_t start_address);

    void setDeviceAddress(uint8_t address){
        _device_address = address;
    }

    void setFrequency(uint32_t frequency){
        _frequency_delay = 1000000 / frequency;
    }

    inline void initialise() {
        _scl.output();
        _sda.output();

        _sda = 1;
        _scl = 0;
        wait_us(_frequency_delay);

        for ( int n = 0; n <= 3; ++n ) {
            stop();
        }
    }

private:
    inline void start() {
        _sda.output();
        wait_us(_frequency_delay);
        _scl = 1;
        _sda = 1;
        wait_us(_frequency_delay);
        _sda = 0;
        wait_us(_frequency_delay);
        _scl = 0;
        wait_us(_frequency_delay);
    }

    inline void stop() {
        _sda.output();
        wait_us(_frequency_delay);
        _sda = 0;
        wait_us(_frequency_delay);
        _scl = 1;
        wait_us(_frequency_delay);
        _sda = 1;
    }

    inline void putByte(uint8_t byte) {
        _sda.output();
        for ( int n = 8; n > 0; --n) {
            wait_us(_frequency_delay);
            _sda = byte & (1 << (n-1));
            _scl = 1;
            wait_us(_frequency_delay);
            _scl = 0;
        }
        _sda = 1;
    }

    inline uint8_t getByte() {
        uint8_t byte = 0;

        _sda.input();          //release the data line
        _sda.mode(OpenDrain);

        wait_us(_frequency_delay);

        for ( int n = 8; n > 0; --n ) {
            _scl=1;            //set clock high
            wait_us(_frequency_delay);
            byte |= _sda << (n-1); //read the bit
            wait_us(_frequency_delay);
            _scl=0;            //set clock low
            wait_us(_frequency_delay);
        }

        _sda.output();         //take data line back

        return byte;
    }

    inline void giveAck() {
        _sda.output();
        wait_us(_frequency_delay);
        _sda = 0;
        _scl = 1;
        wait_us(_frequency_delay);
        _scl = 0;
        _sda = 1;

    }

    inline bool getAck() {
        _sda.output();
        _sda = 1;
        _scl = 1;
        _sda.input();
        _sda.mode(OpenDrain);
        wait_us(_frequency_delay);
        _scl = 0;

        if(_sda != 0){return false;}

        wait_us(_frequency_delay);
        return true;
    }

    DigitalInOut _sda;
    DigitalInOut _scl;

    uint8_t _device_address;
    uint32_t _frequency_delay;
};

#endif