54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
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/*
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* Copyright (c) 2021 Valentin Milea <valentin.milea@gmail.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef _I2C_FIFO_H_
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#define _I2C_FIFO_H_
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#include <hardware/i2c.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \file i2c_fifo.h
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*
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* \brief I2C non-blocking r/w.
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*/
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/**
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* \brief Pop a byte from I2C Rx FIFO.
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*
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* This function is non-blocking and assumes the Rx FIFO isn't empty.
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*
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* \param i2c I2C instance.
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* \return uint8_t Byte value.
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*/
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static inline uint8_t i2c_read_byte(i2c_inst_t *i2c) {
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i2c_hw_t *hw = i2c_get_hw(i2c);
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assert(hw->status & I2C_IC_STATUS_RFNE_BITS); // Rx FIFO must not be empty
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return (uint8_t)hw->data_cmd;
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}
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/**
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* \brief Push a byte into I2C Tx FIFO.
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*
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* This function is non-blocking and assumes the Tx FIFO isn't full.
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*
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* \param i2c I2C instance.
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* \param value Byte value.
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*/
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static inline void i2c_write_byte(i2c_inst_t *i2c, uint8_t value) {
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i2c_hw_t *hw = i2c_get_hw(i2c);
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assert(hw->status & I2C_IC_STATUS_TFNF_BITS); // Tx FIFO must not be full
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hw->data_cmd = value;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // _I2C_FIFO_H_
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