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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 microDev
*
* 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 "common-hal/nvm/ByteArray.h"
#include "shared-bindings/nvm/ByteArray.h"
#include <string.h>
#include "py/runtime.h"
#include "src/rp2_common/hardware_flash/include/hardware/flash.h"
#include "shared-bindings/microcontroller/__init__.h"
extern uint32_t __flash_binary_start;
static const uint32_t flash_binary_start = (uint32_t)&__flash_binary_start;
#define RMV_OFFSET(addr) addr - flash_binary_start
uint32_t common_hal_nvm_bytearray_get_length(const nvm_bytearray_obj_t *self) {
return self->len;
}
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 write a whole page at a time.
if (offset == 0 && len == FLASH_PAGE_SIZE) {
// disable interrupts to prevent core hang on rp2040
common_hal_mcu_disable_interrupts();
flash_range_program(RMV_OFFSET(page_addr), bytes, FLASH_PAGE_SIZE);
common_hal_mcu_enable_interrupts();
} else {
uint8_t buffer[FLASH_PAGE_SIZE];
memcpy(buffer, (uint8_t *)page_addr, FLASH_PAGE_SIZE);
memcpy(buffer + offset, bytes, len);
common_hal_mcu_disable_interrupts();
flash_range_program(RMV_OFFSET(page_addr), buffer, FLASH_PAGE_SIZE);
common_hal_mcu_enable_interrupts();
}
}
static void erase_and_write_sector(uint32_t address, uint32_t len, uint8_t *bytes) {
// Write a whole sector to flash, buffering it first and then erasing and rewriting it
// since we can only erase a whole sector at a time.
uint8_t buffer[FLASH_SECTOR_SIZE];
#pragma GCC diagnostic push
#if __GNUC__ >= 11
// TODO: Update this to a better workaround for GCC 11 when one is provided.
// See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c20
#pragma GCC diagnostic ignored "-Warray-bounds"
#pragma GCC diagnostic ignored "-Wstringop-overread"
#endif
memcpy(buffer, (uint8_t *)CIRCUITPY_INTERNAL_NVM_START_ADDR, FLASH_SECTOR_SIZE);
#pragma GCC diagnostic pop
memcpy(buffer + address, bytes, len);
// disable interrupts to prevent core hang on rp2040
common_hal_mcu_disable_interrupts();
flash_range_erase(RMV_OFFSET(CIRCUITPY_INTERNAL_NVM_START_ADDR), FLASH_SECTOR_SIZE);
flash_range_program(RMV_OFFSET(CIRCUITPY_INTERNAL_NVM_START_ADDR), buffer, FLASH_SECTOR_SIZE);
common_hal_mcu_enable_interrupts();
}
void common_hal_nvm_bytearray_get_bytes(const nvm_bytearray_obj_t *self,
uint32_t start_index, uint32_t len, uint8_t *values) {
memcpy(values, self->start_address + start_index, len);
}
bool common_hal_nvm_bytearray_set_bytes(const nvm_bytearray_obj_t *self,
uint32_t start_index, uint8_t *values, uint32_t len) {
uint8_t values_in[len];
common_hal_nvm_bytearray_get_bytes(self, start_index, len, values_in);
bool all_ones = true;
for (uint32_t i = 0; i < len; i++) {
if (values_in[i] != UINT8_MAX) {
all_ones = false;
break;
}
}
if (all_ones) {
uint32_t address = (uint32_t)self->start_address + 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;
}
} else {
erase_and_write_sector(start_index, len, values);
}
return true;
}
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