circuitpython/ports/broadcom/common-hal/busio/SPI.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2021 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/SPI.h"

#include "shared/runtime/interrupt_char.h"
#include "py/mperrno.h"
#include "py/runtime.h"

#include "supervisor/board.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/Pin.h"

#define NO_INSTANCE 0xff

STATIC bool never_reset_spi[2];

void reset_spi(void) {
    for (size_t i = 0; i < 2; i++) {
        if (never_reset_spi[i]) {
            continue;
        }

        // TODO
    }
}

void common_hal_busio_spi_construct(busio_spi_obj_t *self,
    const mcu_pin_obj_t *clock, const mcu_pin_obj_t *mosi,
    const mcu_pin_obj_t *miso) {

}

void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
    // never_reset_spi[spi_get_index(self->peripheral)] = true;

    common_hal_never_reset_pin(self->clock);
    common_hal_never_reset_pin(self->MOSI);
    common_hal_never_reset_pin(self->MISO);
}

bool common_hal_busio_spi_deinited(busio_spi_obj_t *self) {
    return self->clock == NULL;
}

void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
    if (common_hal_busio_spi_deinited(self)) {
        return;
    }
    // never_reset_spi[spi_get_index(self->peripheral)] = false;

    common_hal_reset_pin(self->clock);
    common_hal_reset_pin(self->MOSI);
    common_hal_reset_pin(self->MISO);
    self->clock = NULL;
}

bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
    uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
    if (baudrate == self->target_frequency &&
        polarity == self->polarity &&
        phase == self->phase &&
        bits == self->bits) {
        return true;
    }

    // TODO

    self->polarity = polarity;
    self->phase = phase;
    self->bits = bits;
    self->target_frequency = baudrate;
    self->real_frequency = baudrate; // TODO

    return true;
}

bool common_hal_busio_spi_try_lock(busio_spi_obj_t *self) {
    bool grabbed_lock = false;
    if (!self->has_lock) {
        grabbed_lock = true;
        self->has_lock = true;
    }
    return grabbed_lock;
}

bool common_hal_busio_spi_has_lock(busio_spi_obj_t *self) {
    return self->has_lock;
}

void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
    self->has_lock = false;
}

bool common_hal_busio_spi_write(busio_spi_obj_t *self,
    const uint8_t *data, size_t len) {
    return false;
}

bool common_hal_busio_spi_read(busio_spi_obj_t *self,
    uint8_t *data, size_t len, uint8_t write_value) {
    return false;
}

bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, const uint8_t *data_out, uint8_t *data_in, size_t len) {
    return false;
}

uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t *self) {
    return self->real_frequency;
}

uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t *self) {
    return self->phase;
}

uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t *self) {
    return self->polarity;
}