AMiRo-OS

/*

AMiRo-LLD is a compilation of low-level hardware drivers for the Autonomous Mini Robot (AMiRo) platform.

Copyright (C) 2016..2020  Thomas Schöpping et al.

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

/**

 * @file    alld_PCA9544A.h

 * @brief   I2C Multiplexer macros and structures.

 *

 * @addtogroup lld_multi

 * @{

 */

#ifndef AMIROLLD_PCA9544A_H

#define AMIROLLD_PCA9544A_H

#include <amiro-lld.h>

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/* CONSTANTS                                                                  */

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/**

 * @brief Maximum I2C frequency.

 */

#define PCA9544A_LLD_I2C_MAXFREQUENCY   400000

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/* SETTINGS                                                                   */

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/* CHECKS                                                                     */

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/* DATA STRUCTURES AND TYPES                                                  */

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/**

 * @brief The PCA9544ADriver struct

 */

typedef struct {

  apalI2CDriver_t* i2cd;  /**< @brief The I²C driver to use. */

  apalI2Caddr_t addr;     /**< @brief The address of the PCA9544A for I2C communication, which is defined by the wiring of the A0, A1, A2 pins */

} PCA9544ADriver;

/**

 * @brief The fixed address prefix of any PCA9544A.

 */

enum {

  PCA9544A_LLD_I2C_ADDR_FIXED   = 0x0070u,

  PCA9544A_LLD_I2C_ADDR_A0      = 0x0001u,

  PCA9544A_LLD_I2C_ADDR_A1      = 0x0002u,

  PCA9544A_LLD_I2C_ADDR_A2      = 0x0004u,

};

/**

 * @brief The control register of the PCA9544A.

 */

typedef enum {

  PCA9544A_LLD_CTRLREG_INT3     = 0x80u, /**< interrupt 3 flag (1 = active) */

  PCA9544A_LLD_CTRLREG_INT2     = 0x40u, /**< interrupt 2 flag (1 = active) */

  PCA9544A_LLD_CTRLREG_INT1     = 0x20u, /**< interrupt 1 flag (1 = active) */

  PCA9544A_LLD_CTRLREG_INT0     = 0x10u, /**< interrupt 0 flag (1 = active) */

  PCA9544A_LLD_CTRLREG_EN       = 0x04u, /**< multiplexing enable flag (1 = enabled) */

  PCA9544A_LLD_CTRLREG_CH_MASK  = 0x03u, /**< bitmask for all channel selection bits */

  PCA9544A_LLD_CTRLREG_CH0      = 0x00u, /**< channel 0 selection mask */

  PCA9544A_LLD_CTRLREG_CH1      = 0x01u, /**< channel 1 selection mask */

  PCA9544A_LLD_CTRLREG_CH2      = 0x02u, /**< channel 2 selection mask */

  PCA9544A_LLD_CTRLREG_CH3      = 0x03u, /**< channel 3 selection mask */

  PCA9544A_LLD_CTRLREG_DEFAULT  = 0x00u, /**< default register value after power-up */

} pca9544a_lld_ctrlreg_t;

/**

 * @brief Interrupt identifiers for external use.

 */

typedef enum {

  PCA9544A_LLD_INT0 = 0x01u, /**< interrupt 0 identifier */

  PCA9544A_LLD_INT1 = 0x02u, /**< interrupt 1 identifier */

  PCA9544A_LLD_INT2 = 0x04u, /**< interrupt 2 identifier */

  PCA9544A_LLD_INT3 = 0x08u, /**< interrupt 3 identifier */

} pca9544a_lld_intid_t;

/**

 * @brief Channel selection identifier for external use.

 */

typedef enum {

  PCA9544A_LLD_CH0      = 0x00u, /**< identifier to select channel 0 */

  PCA9544A_LLD_CH1      = 0x01u, /**< identifier to select channel 1*/

  PCA9544A_LLD_CH2      = 0x02u, /**< identifier to select channel 2 */

  PCA9544A_LLD_CH3      = 0x03u, /**< identifier to select channel 3 */

  PCA9544A_LLD_CH_NONE  = 0xFFu, /**< identifier to select no channel */

} pca9544a_lld_chid_t;

/**

 * @brief Type holding a bit mask for the four channel interrupts.

 */

typedef uint8_t pca9544a_lld_intstatus_t;

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/* MACROS                                                                     */

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/* EXTERN DECLARATIONS                                                        */

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#ifdef __cplusplus

extern "C" {

#endif

  apalExitStatus_t pca9544a_lld_read(const PCA9544ADriver* const pca9544a, uint8_t* const data, const apalTime_t timeout);

  apalExitStatus_t pca9544a_lld_write(const PCA9544ADriver* const pca9544a, const uint8_t data, const apalTime_t timeout);

  apalExitStatus_t pca9544a_lld_getintstatus(const PCA9544ADriver* const pca9544a, pca9544a_lld_intstatus_t* const  status, const apalTime_t timeout);

  apalExitStatus_t pca9544a_lld_getcurrentchannel(const PCA9544ADriver* const pca9544a, pca9544a_lld_chid_t* const channel, const apalTime_t timeout);

  apalExitStatus_t pca9544a_lld_setchannel(const PCA9544ADriver* const pca9544a, const pca9544a_lld_chid_t channel, const apalTime_t timeout);

#ifdef __cplusplus

}

#endif

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/* INLINE FUNCTIONS                                                           */

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#endif /* AMIROLLD_PCA9544A_H */

/** @} */