87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
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/*
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* Copyright (c), 2023 Basalte bv
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_I2C_I2C_SC18IM704_H_
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#define ZEPHYR_DRIVERS_I2C_I2C_SC18IM704_H_
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SC18IM704_CMD_STOP 0x50
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#define SC18IM704_CMD_I2C_START 0x53
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#define SC18IM704_CMD_READ_REG 0x52
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#define SC18IM704_CMD_WRITE_REG 0x57
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#define SC18IM704_CMD_READ_GPIO 0x49
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#define SC18IM704_CMD_WRITE_GPIO 0x4f
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#define SC18IM704_CMD_POWER_DOWN 0x5a
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#define SC18IM704_REG_BRG0 0x00
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#define SC18IM704_REG_BRG1 0x01
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#define SC18IM704_REG_GPIO_CONF1 0x02
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#define SC18IM704_REG_GPIO_CONF2 0x03
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#define SC18IM704_REG_GPIO_STATE 0x04
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#define SC18IM704_REG_I2C_ADDR 0x06
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#define SC18IM704_REG_I2C_CLK_L 0x07
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#define SC18IM704_REG_I2C_CLK_H 0x08
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#define SC18IM704_REG_I2C_TIMEOUT 0x09
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#define SC18IM704_REG_I2C_STAT 0x0a
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#define SC18IM704_I2C_STAT_OK 0xf0
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#define SC18IM704_I2C_STAT_NACK_ADDR 0xf1
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#define SC18IM704_I2C_STAT_NACK_DATA 0xf2
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#define SC18IM704_I2C_STAT_TIMEOUT 0xf8
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/**
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* @brief Claim the SC18IM704 device.
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*
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* @warning After calling this routine, the device cannot be used by any other
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* thread until the sc18im704_release routine is called.
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*
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* @param dev SC18IM704 device.
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*
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* @retval 0 Device claimed.
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* @retval -EBUSY The device could not be claimed.
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*/
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int sc18im704_claim(const struct device *dev);
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/**
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* @brief Release the SC18IM704 device claim.
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*
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* @warning This routine must only be used after a sc18im704_claim.
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*
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* @param dev SC18IM704 device.
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*
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* @retval 0 Device claim to release.
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* @retval -EPERM The current thread hasn't claimed the device.
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* @retval -EINVAL The device has no active claims.
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*/
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int sc18im704_release(const struct device *dev);
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/**
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* @brief Exchange data with the SC18IM704 device.
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*
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* @param dev SC18IM704 device.
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* @param tx_data The data buffer to write from.
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* @param tx_len The length of the tx_data buffer.
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* @param rx_data The data buffer to read to.
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* @param rx_len The length of the rx_data buffer.
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*
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* @retval 0 If successful.
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* @retval -EAGAIN The device did not respond in time (1 second timeout).
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*/
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int sc18im704_transfer(const struct device *dev,
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const uint8_t *tx_data, uint8_t tx_len,
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uint8_t *rx_data, uint8_t rx_len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_DRIVERS_I2C_I2C_SC18IM704_H_ */
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