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82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* Copyright (C) 2018 Mesotic SAS <dylan.laduranty@mesotic.com>
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup drivers_periph_i2c
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* @{
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*
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* @file
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* @brief common I2C function fallback implementations
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*
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* @author Dylan Laduranty <dylan.laduranty@mesotic.com>
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*
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* @}
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*/
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#include "board.h"
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#include "cpu.h"
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#include "periph/i2c.h"
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#ifdef I2C_NUMOF
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#ifdef PERIPH_I2C_NEED_READ_REGS
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int i2c_read_reg(i2c_t dev, uint16_t addr, uint16_t reg,
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void *data, uint8_t flags)
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{
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return i2c_read_regs(dev, addr, reg, data, 1, flags);
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}
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int i2c_read_regs(i2c_t dev, uint16_t addr, uint16_t reg,
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void *data, size_t len, uint8_t flags)
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{
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uint8_t err;
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/* First set ADDR and register with no stop */
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err = i2c_write_bytes(dev, addr, ®, (flags & I2C_REG16) ? 2 : 1,
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flags & I2C_NOSTOP );
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if (err != I2C_ACK) {
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return err;
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}
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/* Then get the data from device */
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return i2c_read_bytes(dev, addr, data, len, flags);
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}
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#endif /* PERIPH_I2C_NEED_READ_REGS */
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int i2c_read_byte(i2c_t dev, uint16_t addr, void *data, uint8_t flags)
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{
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return i2c_read_bytes(dev, addr, data, 1, flags);
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}
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int i2c_write_byte(i2c_t dev, uint16_t addr, uint8_t data, uint8_t flags)
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{
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return i2c_write_bytes(dev, addr, &data, 1, flags);
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}
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#ifdef PERIPH_I2C_NEED_WRITE_REGS
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int i2c_write_reg(i2c_t dev, uint16_t addr, uint16_t reg,
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const void *data, size_t len, uint8_t flags)
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{
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return i2c_write_regs(dev, addr, reg, data, 1);
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}
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int i2c_write_regs(i2c_t dev, uint16_t addr, uint16_t reg,
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const void *data, size_t len, uint8_t flags)
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{
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uint8_t err;
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/* First set ADDR and register with no stop */
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err = i2c_write_bytes(dev, addr, ®, (flags & I2C_REG16) ? 2 : 1,
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flags & I2C_NOSTOP );
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if (err != I2C_ACK) {
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return err;
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}
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/* Then write data to the device */
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return i2c_write_bytes(dev, addr, data, len, flags);
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}
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#endif /* PERIPH_I2C_NEED_WRITE_REGS */
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#endif /* I2C_NUMOF */
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