164 lines
4.0 KiB
C++
164 lines
4.0 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 LeafLabs LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file Wire.h
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* @author Trystan Jones <crenn6977@gmail.com>
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* @brief Wire library, uses the WireBase to create the primary interface
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* while keeping low level interactions invisible to the user.
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*/
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/*
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* Library updated by crenn to follow new Wire system.
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* Code was derived from the original Wire for maple code by leaflabs and the
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* modifications by gke and ala42.
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*/
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#ifndef _SOFTWIRE_H_
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#define _SOFTWIRE_H_
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#include "WireBase.h"
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#include "wirish.h"
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/*
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* On the Maple, let the default pins be in the same location as the Arduino
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* pins
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*/
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#define SDA PB7
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#define SCL PB6
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#define SOFT_STANDARD 19
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#define SOFT_FAST 0
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//#define I2C_DELAY(x) {uint32 time=micros(); while(time>(micros()+x));}
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#define I2C_DELAY(x) do{for(int i=0;i<x;i++) {asm volatile("nop");}}while(0)
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class TwoWire : public WireBase {
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public:
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uint8 i2c_delay;
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uint8 scl_pin;
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uint8 sda_pin;
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/*
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* Sets the SCL line to HIGH/LOW and allow for clock stretching by slave
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* devices
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*/
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void set_scl(bool);
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/*
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* Sets the SDA line to HIGH/LOW
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*/
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void set_sda(bool);
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/*
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* Creates a Start condition on the bus
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*/
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void i2c_start();
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/*
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* Creates a Stop condition on the bus
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*/
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void i2c_stop();
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/*
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* Created a Repeated Start condition on the bus
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*/
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void i2c_repeated_start();
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/*
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* Gets an ACK condition from a slave device on the bus
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*/
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bool i2c_get_ack();
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/*
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* Creates a ACK condition on the bus
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*/
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void i2c_send_ack();
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/*
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* Creates a NACK condition on the bus
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*/
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void i2c_send_nack();
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/*
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* Shifts in the data through SDA and clocks SCL for the slave device
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*/
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uint8 i2c_shift_in();
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/*
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* Shifts out the data through SDA and clocks SCL for the slave device
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*/
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void i2c_shift_out(uint8);
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protected:
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/*
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* Processes the incoming I2C message defined by WireBase
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*/
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uint8 process(uint8);
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uint8 process();
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private:
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gpio_dev *sdaDevice;
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uint8 sdaBit;
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gpio_dev *sclDevice;
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uint8 sclBit;
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public:
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/*
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* Accept pin numbers for SCL and SDA lines. Set the delay needed
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* to create the timing for I2C's Standard Mode and Fast Mode.
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*/
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TwoWire(uint8 scl=SCL, uint8 sda=SDA, uint8 delay=SOFT_STANDARD);
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/*
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* Sets pins SDA and SCL to OUPTUT_OPEN_DRAIN, joining I2C bus as
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* master. This function overwrites the default behaviour of
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* .begin(uint8) in WireBase
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*/
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void begin(uint8 = 0x00);
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void setClock(uint32_t frequencyHz);
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/*
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* Sets pins SDA and SCL to INPUT
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*/
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void end();
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/*
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* If object is destroyed, set pin numbers to 0.
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*/
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~TwoWire();
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};
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//extern TwoWire Wire;
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#endif // _WIRE_H_
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