Earle F. Philhower, III
8016a932f3
Miscellaneous CI checks for code style, boards.txt update, and that all referenced packages are available.
115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
/*
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I2C Master/Slave library for the Raspberry Pi Pico RP2040
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Copyright (c) 2021 Earle F. Philhower, III <earlephilhower@yahoo.com>
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Based off of TWI/I2C library for Arduino Zero
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Copyright (c) 2015 Arduino LLC. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma once
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#include <Arduino.h>
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#include "api/HardwareI2C.h"
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#include <hardware/i2c.h>
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// WIRE_HAS_END means Wire has end()
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#define WIRE_HAS_END 1
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#ifndef WIRE_BUFFER_SIZE
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#define WIRE_BUFFER_SIZE 128
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#endif
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class TwoWire : public HardwareI2C {
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public:
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TwoWire(i2c_inst_t *i2c, pin_size_t sda, pin_size_t scl);
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// Start as Master
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void begin() override;
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// Start as Slave
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void begin(uint8_t address) override;
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// Shut down the I2C interface
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void end() override;
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// Select IO pins to use. Call before ::begin()
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bool setSDA(pin_size_t sda);
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bool setSCL(pin_size_t scl);
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void setClock(uint32_t freqHz) override;
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void beginTransmission(uint8_t) override;
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uint8_t endTransmission(bool stopBit) override;
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uint8_t endTransmission(void) override;
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size_t requestFrom(uint8_t address, size_t quantity, bool stopBit) override;
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size_t requestFrom(uint8_t address, size_t quantity) override;
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size_t write(uint8_t data) override;
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size_t write(const uint8_t * data, size_t quantity) override;
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virtual int available(void) override;
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virtual int read(void) override;
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virtual int peek(void) override;
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virtual void flush(void) override;
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void onReceive(void(*)(int));
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void onRequest(void(*)(void));
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inline size_t write(unsigned long n) {
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return write((uint8_t)n);
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}
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inline size_t write(long n) {
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return write((uint8_t)n);
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}
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inline size_t write(unsigned int n) {
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return write((uint8_t)n);
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}
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inline size_t write(int n) {
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return write((uint8_t)n);
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}
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using Print::write;
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// IRQ callback
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void onIRQ();
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private:
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i2c_inst_t *_i2c;
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pin_size_t _sda;
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pin_size_t _scl;
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int _clkHz;
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bool _running;
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bool _slave;
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uint8_t _addr;
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bool _txBegun;
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uint8_t _buff[WIRE_BUFFER_SIZE];
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int _buffLen;
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int _buffOff;
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// Callback user functions
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void (*_onRequestCallback)(void);
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void (*_onReceiveCallback)(int);
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bool _slaveStartDet = false;
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// TWI clock frequency
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static const uint32_t TWI_CLOCK = 100000;
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};
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extern TwoWire Wire;
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extern TwoWire Wire1;
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