File content as of revision 21:99c367e8a402:

/**
 ******************************************************************************
 * @file    stmpe1600_class.h
 * @author  AST / EST
 * @version V0.0.1
 * @date    14-April-2015
 * @brief   Header file for component stmpe1600
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of STMicroelectronics nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************
*/
#ifndef     __STMPE1600_CLASS
#define     __STMPE1600_CLASS
/* Includes ------------------------------------------------------------------*/
#include    "DevI2C.h"

#define STMPE1600_DEF_DEVICE_ADDRESS  (uint8_t)0x42*2
#define STMPE1600_DEF_DIGIOUT_LVL      1

/**  STMPE1600 registr map **/
#define CHIP_ID_0_7       (uint8_t)0x00
#define CHIP_ID_8_15      (uint8_t)0x01
#define VERSION_ID        (uint8_t)0x02
#define SYS_CTRL          (uint8_t)0x03
#define IEGPIOR_0_7       (uint8_t)0x08
#define IEGPIOR_8_15	  (uint8_t)0x09
#define ISGPIOR_0_7       (uint8_t)0x0A
#define ISGPIOR_8_15	  (uint8_t)0x0B
#define GPMR_0_7	      (uint8_t)0x10
#define GPMR_8_15	      (uint8_t)0x11
#define GPSR_0_7	      (uint8_t)0x12
#define GPSR_8_15	      (uint8_t)0x13
#define GPDR_0_7	      (uint8_t)0x14
#define GPDR_8_15	      (uint8_t)0x15
#define GPIR_0_7	      (uint8_t)0x16
#define GPIR_8_15	      (uint8_t)0x17

#define SOFT_RESET        (uint8_t)0x80

typedef enum {
    // GPIO Expander pin names
    GPIO_0 = 0,
    GPIO_1,
    GPIO_2,
    GPIO_3,
    GPIO_4,
    GPIO_5,
    GPIO_6,
    GPIO_7,
    GPIO_8,
    GPIO_9,
    GPIO_10,
    GPIO_11,
    GPIO_12,
    GPIO_13,
    GPIO_14,
    GPIO_15,
    NOT_CON
} ExpGpioPinName;

typedef enum {
    INPUT = 0,
    OUTPUT,
    NOT_CONNECTED
} ExpGpioPinDirection;

/* Classes -------------------------------------------------------------------*/
/** Class representing a single stmpe1600 GPIO expander output pin
 */
class Stmpe1600DigiOut
{

public:
    /** Constructor
     * @param[in] &i2c device I2C to be used for communication
     * @param[in] outpinname the desired out pin name to be created
     * @param[in] DevAddr the stmpe1600 I2C device address (deft STMPE1600_DEF_DEVICE_ADDRESS)
     * @param[in] lvl the default ot pin level
     */
    Stmpe1600DigiOut(DevI2C &i2c, ExpGpioPinName out_pin_name, uint8_t dev_addr = STMPE1600_DEF_DEVICE_ADDRESS,
                     bool lvl = STMPE1600_DEF_DIGIOUT_LVL) : dev_i2c(&i2c), exp_dev_addr(dev_addr), exp_pin_name(out_pin_name)
    {
        uint8_t data[2];

        if (exp_pin_name == NOT_CON)
            return;
        /* set the exp_pin_name as output */
        dev_i2c->i2c_read(data, exp_dev_addr, GPDR_0_7, 1);
        dev_i2c->i2c_read(&data[1], exp_dev_addr, GPDR_8_15, 1);
        *(uint16_t *)data = *(uint16_t *)data | (1 << (uint16_t)exp_pin_name);         // set gpio as out
        dev_i2c->i2c_write(data, exp_dev_addr, GPDR_0_7, 1);
        dev_i2c->i2c_write(&data[1], exp_dev_addr, GPDR_8_15, 1);
        write(lvl);
    }

    /**
     * @brief       Write on the out pin
     * @param[in]   lvl level to write
     * @return      0 on Success
     */
    void write(int lvl)
    {
        uint8_t data[2];

        if (exp_pin_name == NOT_CON)
            return;
        /* set the exp_pin_name state to lvl */
        dev_i2c->i2c_read(data, exp_dev_addr, GPSR_0_7, 2);
        *(uint16_t *)data = *(uint16_t *)data & (uint16_t)(~(1 << (uint16_t)exp_pin_name));               // set pin mask
        if (lvl)
            *(uint16_t *)data = *(uint16_t *)data | (uint16_t)(1 << (uint16_t)exp_pin_name);
        dev_i2c->i2c_write(data, exp_dev_addr, GPSR_0_7, 2);
    }

    /**
     * @brief       Overload assignement operator
     */
    Stmpe1600DigiOut &operator= (int lvl)
    {
        write(lvl);
        return *this;
    }

private:
    DevI2C *dev_i2c;
    uint8_t exp_dev_addr;
    ExpGpioPinName exp_pin_name;
};

/* Classes -------------------------------------------------------------------*/
/** Class representing a single stmpe1600 GPIO expander input pin
 */
class Stmpe1600DigiIn
{
public:
    /** Constructor
    * @param[in] &i2c device I2C to be used for communication
    * @param[in] inpinname the desired input pin name to be created
    * @param[in] DevAddr the stmpe1600 I2C device addres (deft STMPE1600_DEF_DEVICE_ADDRESS)
    */
    Stmpe1600DigiIn(DevI2C &i2c, ExpGpioPinName in_pin_name,
                    uint8_t dev_addr = STMPE1600_DEF_DEVICE_ADDRESS) : dev_i2c(&i2c), exp_dev_addr(dev_addr),
        exp_pin_name(in_pin_name)
    {
        uint8_t data[2];

        if (exp_pin_name == NOT_CON)
            return;
        /* set the exp_pin_name as input pin direction */
        dev_i2c->i2c_read(data, exp_dev_addr, GPDR_0_7, 2);
        *(uint16_t *)data = *(uint16_t *)data & (uint16_t)(~(1 << (uint16_t)exp_pin_name));               // set gpio as in
        dev_i2c->i2c_write(data, exp_dev_addr, GPDR_0_7, 2);
    }

    /**
     * @brief       Read the input pin
     * @return      The pin logical state 0 or 1
     */
    bool read()
    {
        uint8_t data[2];

        if (exp_pin_name == NOT_CON)
            return false;
        /* read the exp_pin_name */
        dev_i2c->i2c_read(data, exp_dev_addr, GPMR_0_7, 2);
        *(uint16_t *)data = *(uint16_t *)data & (uint16_t)(1 << (uint16_t)exp_pin_name);            // mask the in gpio
        if (data[0] || data[1])
            return true;
        return false;
    }

    operator int()
    {
        return read();
    }

private:
    DevI2C *dev_i2c;
    uint8_t exp_dev_addr;
    ExpGpioPinName exp_pin_name;
};

/* Classes -------------------------------------------------------------------*/
/** Class representing a whole stmpe1600 component (16 gpio)
 */
class Stmpe1600
{

public:
    /** Constructor
    * @param[in] &i2c device I2C to be used for communication
    * @param[in] DevAddr the stmpe1600 I2C device addres (deft STMPE1600_DEF_DEVICE_ADDRESS)
    */
    Stmpe1600(DevI2C &i2c, uint8_t dev_addr = STMPE1600_DEF_DEVICE_ADDRESS) : dev_i2c(&i2c)
    {
        exp_dev_addr = dev_addr;
        write_sys_ctrl(SOFT_RESET);

        gpdr0_15 = (uint16_t) 0;	// gpio dir all IN
        write_16bit_reg(GPDR_0_7, &gpdr0_15);
        gpsr0_15 = (uint16_t) 0x0ffff;   // gpio status all 1
        write_16bit_reg(GPSR_0_7, &gpsr0_15);
    }

    /**
     * @brief       Write the SYS_CTRL register
     * @param[in]   Data to be written (bit fields)
     */
    void write_sys_ctrl(uint8_t data)      // data = SOFT_RESET reset the device
    {
        dev_i2c->i2c_write(&data, exp_dev_addr, SYS_CTRL, 1);
    }

    /**
     * @brief       Set the out pin
     * @param[in]   The pin name
     * @return      0 on Success
     */
    bool set_gpio(ExpGpioPinName pin_name)
    {
        if (pin_name == NOT_CON)
            return true;
        gpsr0_15 = gpsr0_15 | ((uint16_t) 0x0001 << pin_name);
        write_16bit_reg(GPSR_0_7, &gpsr0_15);
        return false;
    }

    /**
     * @brief       Clear the out pin
     * @param[in]   The pin name
     * @return      0 on Success
     */
    bool clear_gpio(ExpGpioPinName pin_name)
    {
        if (pin_name == NOT_CON)
            return true;
        gpsr0_15 = gpsr0_15 & (~((uint16_t) 0x0001 << pin_name));
        write_16bit_reg(GPSR_0_7, &gpsr0_15);
        return false;
    }

    /**
     * @brief       Read the input pin
     * @param[in]   The pin name
     * @return      The logical pin level
     */
    bool read_gpio(ExpGpioPinName pin_name)
    {
        uint16_t gpmr0_15;
        if (pin_name == NOT_CON)
            return true;
        read_16bit_reg(GPMR_0_7, &gpmr0_15);
        gpmr0_15 = gpmr0_15 & ((uint16_t) 0x0001 << pin_name);
        if (gpmr0_15)
            return true;
        return false;
    }

    /**
     * @brief       Set the pin direction
     * @param[in]   The pin name
     * @param[in]   The pin direction
     * @return      0 on success
     */
    bool set_gpio_dir(ExpGpioPinName pin_name, ExpGpioPinDirection pin_dir)
    {
        if (pin_name == NOT_CON || pin_dir == NOT_CONNECTED)
            return true;
        gpdr0_15 = gpdr0_15 & (~((uint16_t) 0x0001 << pin_name));        // clear the Pin
        gpdr0_15 = gpdr0_15 | ((uint16_t) pin_dir << pin_name);
        write_16bit_reg(GPDR_0_7, &gpdr0_15);
        return false;
    }

    /**
     * @brief       Read a 16 bits register
     * @param[in]   The register address
     * @param[in]   The pointer to the read data
     */
    void read_16bit_reg(uint8_t reg16_addr, uint16_t *reg16_data)
    {
        dev_i2c->i2c_read((uint8_t *) reg16_data, exp_dev_addr, reg16_addr, 2);
    }

    /**
     * @brief       Write a 16 bits register
     * @param[in]   The register address
     * @param[in]   The pointer to the data to be written
     */
    void write_16bit_reg(uint8_t reg16_addr, uint16_t *reg16_data)
    {
        dev_i2c->i2c_write((uint8_t *) reg16_data, exp_dev_addr, reg16_addr, 2);
    }

private:
    DevI2C *dev_i2c;
    uint16_t gpdr0_15;  // local copy of bit direction reg
    uint16_t gpsr0_15;  // local copy of bit status reg
    uint8_t exp_dev_addr; // expander device i2c addr
};

#endif // __STMPE1600_CLASS