ad7780.h

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/***************************************************************************/
#ifndef __AD7780_H__
#define __AD7780_H__
 
/******************************************************************************/
/***************************** Include Files **********************************/
/******************************************************************************/
#include <stdint.h>
#include "no_os_gpio.h"
#include "no_os_spi.h"
 
/******************************************************************************/
/************************** AD7780 Definitions ********************************/
/******************************************************************************/
 
/* DOUT/RDY pin */
#define AD7780_RDY_STATE(value) no_os_gpio_get_value(dev->gpio_miso,             \
                        &value)
 
/* PDRST pin */
#define AD7780_PDRST_PIN_OUT    no_os_gpio_direction_output(dev->gpio_pdrst,     \
                                  NO_OS_GPIO_HIGH);
#define AD7780_PDRST_HIGH       no_os_gpio_set_value(dev->gpio_pdrst,            \
                    NO_OS_GPIO_HIGH)
#define AD7780_PDRST_LOW        no_os_gpio_set_value(dev->gpio_pdrst,            \
                    NO_OS_GPIO_LOW)
 
/* FILTER pin */
#define AD7780_FILTER_PIN_OUT   no_os_gpio_direction_output(dev->gpio_filter,    \
                                  NO_OS_GPIO_HIGH);
#define AD7780_FILTER_HIGH      no_os_gpio_set_value(dev->gpio_filter,           \
                    NO_OS_GPIO_HIGH)
#define AD7780_FILTER_LOW       no_os_gpio_set_value(dev->gpio_filter,           \
                    NO_OS_GPIO_LOW)
 
/* GAIN pin */
#define AD7780_GAIN_PIN_OUT     no_os_gpio_direction_output(dev->gpio_gain,      \
                                  NO_OS_GPIO_HIGH);
#define AD7780_GAIN_HIGH        no_os_gpio_set_value(dev->gpio_gain,             \
                    NO_OS_GPIO_HIGH)
#define AD7780_GAIN_LOW         no_os_gpio_set_value(dev->gpio_gain,             \
                    NO_OS_GPIO_LOW)
 
/* Status bits */
#define AD7780_STAT_RDY         (1 << 7) // Ready bit.
#define AD7780_STAT_FILTER      (1 << 6) // Filter bit.
#define AD7780_STAT_ERR         (1 << 5) // Error bit.
#define AD7780_STAT_ID1         (1 << 4) // ID bits.
#define AD7780_STAT_ID0         (1 << 3) // ID bits.
#define AD7780_STAT_GAIN        (1 << 2) // Gain bit.
#define AD7780_STAT_PAT1        (1 << 1) // Status pattern bits.
#define AD7780_STAT_PAT0        (1 << 0) // Status pattern bits.
 
#define AD7780_ID_NUMBER        0x08
 
/******************************************************************************/
/*************************** Types Declarations *******************************/
/******************************************************************************/
 
struct ad7780_dev {
    /* SPI */
    struct no_os_spi_desc   *spi_desc;
    /* GPIO */
    struct no_os_gpio_desc  *gpio_pdrst;
    struct no_os_gpio_desc  *gpio_miso;
    struct no_os_gpio_desc  *gpio_filter;
    struct no_os_gpio_desc  *gpio_gain;
};
 
struct ad7780_init_param {
    /* SPI */
    struct no_os_spi_init_param spi_init;
    /* GPIO */
    struct no_os_gpio_init_param    gpio_pdrst;
    struct no_os_gpio_init_param    gpio_miso;
    struct no_os_gpio_init_param    gpio_filter;
    struct no_os_gpio_init_param    gpio_gain;
};
 
/******************************************************************************/
/************************ Functions Declarations ******************************/
/******************************************************************************/
 
int8_t ad7780_init(struct ad7780_dev **device,
           struct ad7780_init_param init_param);
 
int32_t ad7780_remove(struct ad7780_dev *dev);
 
int8_t ad7780_wait_rdy_go_low(struct ad7780_dev *dev);
 
int32_t ad7780_read_sample(struct ad7780_dev *dev,
               uint8_t* p_status);
 
float ad7780_convert_to_voltage(uint32_t raw_sample,
                float v_ref,
                uint8_t gain);
 
#endif /* __AD7780_H__ */