circuitpython/ports/stm32f4/common-hal/nvm/ByteArray.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Nick Moore 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.
 */

//TODO: Implement for STM32. File required by Microcontroller Init

#include "common-hal/nvm/ByteArray.h"

#include <stdio.h>
#include <string.h>

// defined in linker
extern uint32_t __fatfs_flash_start_addr[];
extern uint32_t __fatfs_flash_length[];

#define NVM_START_ADDR ((uint32_t)__fatfs_flash_start_addr + \
     (uint32_t)__fatfs_flash_length - CIRCUITPY_INTERNAL_NVM_SIZE)

uint32_t common_hal_nvm_bytearray_get_length(nvm_bytearray_obj_t *self) {
    return CIRCUITPY_INTERNAL_NVM_SIZE;
}

static void write_page(uint32_t page_addr, uint32_t offset, uint32_t len, uint8_t *bytes) {
    //
    // Write a whole page to flash, buffering it first and then erasing and rewriting 
    // it since we can only clear a whole page at a time.

    // if (offset == 0 && len == FLASH_PAGE_SIZE) {
    //     nrf_nvm_safe_flash_page_write(page_addr, bytes);
    // } else {
    //     uint8_t buffer[FLASH_PAGE_SIZE];
    //     memcpy(buffer, (uint8_t *)page_addr, FLASH_PAGE_SIZE);
    //     memcpy(buffer + offset, bytes, len);
    //     nrf_nvm_safe_flash_page_write(page_addr, buffer);
    // }
}

bool common_hal_nvm_bytearray_set_bytes(nvm_bytearray_obj_t *self,
    //     uint32_t start_index, uint8_t* values, uint32_t len) {

    // uint32_t address = NVM_START_ADDR + start_index;
    // uint32_t offset = address % FLASH_PAGE_SIZE;
    // uint32_t page_addr = address - offset;

    // while (len) {
    //     uint32_t write_len = MIN(len, FLASH_PAGE_SIZE - offset);
    //     write_page(page_addr, offset, write_len, values);
    //     len -= write_len;
    //     values += write_len;
    //     page_addr += FLASH_PAGE_SIZE;
    //     offset = 0;
    // }
    return true;
}

void common_hal_nvm_bytearray_get_bytes(nvm_bytearray_obj_t *self,
    uint32_t start_index, uint32_t len, uint8_t* values) {
    memcpy(values, (uint8_t *)(NVM_START_ADDR + start_index), len);
}