pimoroni-pico/micropython/modules/breakout_bme68x/breakout_bme68x.cpp

#include "drivers/bme68x/bme68x.hpp"

#define MP_OBJ_TO_PTR2(o, t) ((t *)(uintptr_t)(o))

// SDA/SCL on even/odd pins, I2C0/I2C1 on even/odd pairs of pins.
#define IS_VALID_SCL(i2c, pin) (((pin) & 1) == 1 && (((pin) & 2) >> 1) == (i2c))
#define IS_VALID_SDA(i2c, pin) (((pin) & 1) == 0 && (((pin) & 2) >> 1) == (i2c))


using namespace pimoroni;

extern "C" {
#include "breakout_bme68x.h"
#include "pimoroni_i2c.h"

/***** I2C Struct *****/
typedef struct _PimoroniI2C_obj_t {
    mp_obj_base_t base;
    I2C *i2c;
} _PimoroniI2C_obj_t;

/***** Variables Struct *****/
typedef struct _breakout_bme68x_BreakoutBME68X_obj_t {
    mp_obj_base_t base;
    BME68X *breakout;
} breakout_bme68x_BreakoutBME68X_obj_t;

/***** Print *****/
void BreakoutBME68X_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
    (void)kind; //Unused input parameter    
    breakout_bme68x_BreakoutBME68X_obj_t *self = MP_OBJ_TO_PTR2(self_in, breakout_bme68x_BreakoutBME68X_obj_t);
    BME68X* breakout = self->breakout;
    mp_print_str(print, "BreakoutBME68X(");

    mp_print_str(print, "i2c = ");
    mp_obj_print_helper(print, mp_obj_new_int((breakout->get_i2c()->get_i2c() == i2c0) ? 0 : 1), PRINT_REPR);

    mp_print_str(print, ", sda = ");
    mp_obj_print_helper(print, mp_obj_new_int(breakout->get_i2c()->get_sda()), PRINT_REPR);

    mp_print_str(print, ", scl = ");
    mp_obj_print_helper(print, mp_obj_new_int(breakout->get_i2c()->get_scl()), PRINT_REPR);

    mp_print_str(print, ", int = ");
    mp_obj_print_helper(print, mp_obj_new_int(breakout->get_int()), PRINT_REPR);

    mp_print_str(print, ")");
}

/***** Constructor *****/
mp_obj_t BreakoutBME68X_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
    breakout_bme68x_BreakoutBME68X_obj_t *self = nullptr;

    enum { ARG_i2c, ARG_address, ARG_int };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
        { MP_QSTR_address, MP_ARG_INT, {.u_int = BME68X::DEFAULT_I2C_ADDRESS} },
        { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
    };

    // Parse args.
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);


    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutBME68X: Bad i2C object"));
        return mp_const_none;
    }

    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);

    self = m_new_obj(breakout_bme68x_BreakoutBME68X_obj_t);
    self->base.type = &breakout_bme68x_BreakoutBME68X_type;

    self->breakout = new BME68X(i2c->i2c, args[ARG_address].u_int, args[ARG_int].u_int);

    if(!self->breakout->init()) {
        mp_raise_msg(&mp_type_RuntimeError, "BreakoutBME68X: breakout not found when initialising");
    }

    return MP_OBJ_FROM_PTR(self);
}

mp_obj_t BreakoutBME68X_read(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum { ARG_self, ARG_temp, ARG_duration };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_, MP_ARG_REQUIRED | MP_ARG_OBJ },
        { MP_QSTR_heater_temp, MP_ARG_INT, { .u_int=300 } },
        { MP_QSTR_heater_duration, MP_ARG_INT, { .u_int=100 } },
    };

    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    breakout_bme68x_BreakoutBME68X_obj_t *self = MP_OBJ_TO_PTR2(args[ARG_self].u_obj, breakout_bme68x_BreakoutBME68X_obj_t);

    bme68x_data result;
    if(self->breakout->read_forced(&result, args[ARG_temp].u_int, args[ARG_duration].u_int)){
        mp_obj_t tuple[7];
        tuple[0] = mp_obj_new_float(result.temperature);
        tuple[1] = mp_obj_new_float(result.pressure);
        tuple[2] = mp_obj_new_float(result.humidity);
        tuple[3] = mp_obj_new_float(result.gas_resistance);
        tuple[4] = mp_obj_new_int(result.status);
        tuple[5] = mp_obj_new_int(result.gas_index);
        tuple[6] = mp_obj_new_int(result.meas_index);
        return mp_obj_new_tuple(7, tuple);
    }
    else {
        mp_raise_msg(&mp_type_RuntimeError, "BreakoutBME68X: failed read_forced");
        return mp_const_none;
    }
}

mp_obj_t BreakoutBME68X_configure(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum { ARG_self, ARG_filter, ARG_standby_time, ARG_os_pressure, ARG_os_temp, ARG_os_humidity };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_, MP_ARG_REQUIRED | MP_ARG_OBJ },
        { MP_QSTR_filter, MP_ARG_INT, { .u_int=BME68X_FILTER_SIZE_3 } },
        { MP_QSTR_standby_time, MP_ARG_INT, { .u_int=BME68X_ODR_0_59_MS } },
        { MP_QSTR_os_pressure, MP_ARG_INT, { .u_int=BME68X_OS_16X } },
        { MP_QSTR_os_temp, MP_ARG_INT, { .u_int=BME68X_OS_2X } },
        { MP_QSTR_os_humidity, MP_ARG_INT, { .u_int=BME68X_OS_1X } }
    };

    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    breakout_bme68x_BreakoutBME68X_obj_t *self = MP_OBJ_TO_PTR2(args[ARG_self].u_obj, breakout_bme68x_BreakoutBME68X_obj_t);
    self->breakout->configure(
        args[ARG_filter].u_int,
        args[ARG_standby_time].u_int,
        args[ARG_os_humidity].u_int,
        args[ARG_os_pressure].u_int,
        args[ARG_os_temp].u_int
    );

    return mp_const_none;
}

}