mirror of https://github.com/rusefi/rusefi-1.git
66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
/**
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* @file i2c_bb.h
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* @brief Bit-banged I2C driver
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*
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* @date February 6, 2020
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* @author Matthew Kennedy, (c) 2020
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*/
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#pragma once
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#if EFI_PROD_CODE
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#include "hal.h"
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#endif
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#include "rusefi_hw_enums.h"
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#include <cstdint>
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#include <cstddef>
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class BitbangI2c {
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public:
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// Initialize the I2C driver
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bool init(brain_pin_e scl, brain_pin_e sda);
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// Write a sequence of bytes to the specified device
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void write(uint8_t addr, const uint8_t* data, size_t size);
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// Read a sequence of bytes from the device
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void read(uint8_t addr, uint8_t* data, size_t size);
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// Write some bytes then read some bytes back after a repeated start bit
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void writeRead(uint8_t addr, const uint8_t* writeData, size_t writeSize, uint8_t* readData, size_t readSize);
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// Read a register at the specified address and register index
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uint8_t readRegister(uint8_t addr, uint8_t reg);
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// Write a register at the specified address and register index
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void writeRegister(uint8_t addr, uint8_t reg, uint8_t val);
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private:
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// Returns true if the remote device acknowledged the transmission
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bool writeByte(uint8_t data);
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uint8_t readByte(bool ack);
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void sda_low();
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void sda_high();
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void scl_low();
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void scl_high();
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// Send an I2C start condition
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void start();
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// Send an I2C stop condition
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void stop();
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// Send a single bit
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void sendBit(bool val);
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// Read a single bit
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bool readBit();
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// Wait for 1/4 of a bit time
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void waitQuarterBit();
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#if EFI_PROD_CODE
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ioportid_t m_sclPort = 0;
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ioportmask_t m_sclPin = 0;
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ioportid_t m_sdaPort = 0;
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ioportmask_t m_sdaPin = 0;
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#endif
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};
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