circuitpython/ports/atmel-samd/board_busses.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "shared-bindings/busio/I2C.h"
#include "shared-bindings/busio/SPI.h"
#include "shared-bindings/busio/UART.h"

#include "shared-bindings/microcontroller/Pin.h"
#include "mpconfigboard.h"
#include "pins.h"
#include "py/runtime.h"



#if !defined(DEFAULT_I2C_BUS_SDA) || !defined(DEFAULT_I2C_BUS_SCL)
    STATIC mp_obj_t board_i2c(void) {
        mp_raise_NotImplementedError("No default I2C bus");
        return NULL;
    }
#else
    STATIC mp_obj_t i2c_singleton = NULL;

    STATIC mp_obj_t board_i2c(void) {

        if (i2c_singleton == NULL) {
            busio_i2c_obj_t *self = m_new_obj(busio_i2c_obj_t);
            self->base.type = &busio_i2c_type;

            assert_pin_free(DEFAULT_I2C_BUS_SDA);
            assert_pin_free(DEFAULT_I2C_BUS_SCL);
            common_hal_busio_i2c_construct(self, DEFAULT_I2C_BUS_SCL, DEFAULT_I2C_BUS_SDA, 400000, 0);
            i2c_singleton = (mp_obj_t)self;
        }
        return i2c_singleton;

    }
#endif
MP_DEFINE_CONST_FUN_OBJ_0(board_i2c_obj, board_i2c);

#if !defined(DEFAULT_SPI_BUS_SCK) || !defined(DEFAULT_SPI_BUS_MISO) || !defined(DEFAULT_SPI_BUS_MOSI)
    STATIC mp_obj_t board_spi(void) {
        mp_raise_NotImplementedError("No default SPI bus");
        return NULL;
    }
#else
    STATIC mp_obj_t spi_singleton = NULL;

    STATIC mp_obj_t board_spi(void) {

        if (spi_singleton == NULL) {
            busio_spi_obj_t *self = m_new_obj(busio_spi_obj_t);
            self->base.type = &busio_spi_type;
            assert_pin_free(DEFAULT_SPI_BUS_SCK);
            assert_pin_free(DEFAULT_SPI_BUS_MOSI);
            assert_pin_free(DEFAULT_SPI_BUS_MISO);
            const mcu_pin_obj_t* clock = MP_OBJ_TO_PTR(DEFAULT_SPI_BUS_SCK);
            const mcu_pin_obj_t* mosi = MP_OBJ_TO_PTR(DEFAULT_SPI_BUS_MOSI);
            const mcu_pin_obj_t* miso = MP_OBJ_TO_PTR(DEFAULT_SPI_BUS_MISO);
            common_hal_busio_spi_construct(self, clock, mosi, miso);
            spi_singleton = (mp_obj_t)self;
        }
        return spi_singleton;
    }
#endif
MP_DEFINE_CONST_FUN_OBJ_0(board_spi_obj, board_spi);

#if !defined(DEFAULT_UART_BUS_RX) || !defined(DEFAULT_UART_BUS_TX)
    STATIC mp_obj_t board_uart(void) {
        mp_raise_NotImplementedError("No default UART bus");
        return NULL;
    }
#else
    STATIC mp_obj_t uart_singleton = NULL;

    STATIC mp_obj_t board_uart(void) {
        if (uart_singleton == NULL) {
            busio_uart_obj_t *self = m_new_obj(busio_uart_obj_t);
            self->base.type = &busio_uart_type;

            assert_pin_free(DEFAULT_UART_BUS_RX);
            assert_pin_free(DEFAULT_UART_BUS_TX);

            const mcu_pin_obj_t* rx = MP_OBJ_TO_PTR(DEFAULT_UART_BUS_RX);
            const mcu_pin_obj_t* tx = MP_OBJ_TO_PTR(DEFAULT_UART_BUS_TX);

            common_hal_busio_uart_construct(self, tx, rx, 9600, 8, PARITY_NONE, 1, 1000, 64);
            uart_singleton = (mp_obj_t)self;
        }
        return uart_singleton;
    }
#endif
MP_DEFINE_CONST_FUN_OBJ_0(board_uart_obj, board_uart);