97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
// Copyright 2017 Todd Fleming
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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#include "grbl.h"
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static constexpr unsigned flash_sector = 15; // Last 4k sector
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static constexpr unsigned flash_addr = 0xF000; // Last 4k sector
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static constexpr unsigned flash_size = 1024; // Only using 1k of a 4k sector
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static char *flash_memory = (char *)flash_addr; // Flash memory
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static char flash_buffer[flash_size] __attribute__((aligned(4))); // Copy of flash memory
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using Iap = void(unsigned[], unsigned[]); // IAP entry point
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static const Iap *iap = (Iap *)0x1FFF1FF1; // IAP entry point
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void eeprom_init()
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{
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memcpy(flash_buffer, flash_memory, flash_size);
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}
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void eeprom_commit()
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{
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if (!memcmp(flash_buffer, flash_memory, flash_size))
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return;
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unsigned prepCommand[5] = {
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50,
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flash_sector,
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flash_sector,
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};
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unsigned eraseCommand[5] = {
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52,
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flash_sector,
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flash_sector,
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SystemCoreClock / 1000,
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};
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unsigned writeCommand[5] = {
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51,
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flash_addr,
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(unsigned)flash_buffer,
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flash_size,
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SystemCoreClock / 1000,
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};
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unsigned output[5];
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iap(prepCommand, output);
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iap(eraseCommand, output);
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iap(prepCommand, output);
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iap(writeCommand, output);
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}
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unsigned char eeprom_get_char(unsigned int addr)
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{
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return flash_buffer[addr];
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}
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void eeprom_put_char(unsigned int addr, unsigned char new_value)
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{
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flash_buffer[addr] = new_value;
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}
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static unsigned char memcpy_with_checksum(char *dest, char *src, unsigned size)
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{
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unsigned char checksum = 0;
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while (size--)
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{
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checksum = ((checksum << 1) || (checksum >> 7)) + *src;
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*dest++ = *src++;
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}
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return checksum;
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}
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void memcpy_to_eeprom_with_checksum(unsigned int destination, char *source, unsigned int size)
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{
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auto checksum = memcpy_with_checksum(flash_buffer + destination, source, size);
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flash_buffer[destination + size] = checksum;
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}
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int memcpy_from_eeprom_with_checksum(char *destination, unsigned int source, unsigned int size)
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{
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auto checksum = memcpy_with_checksum(destination, flash_buffer + source, size);
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return checksum == flash_buffer[source + size];
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}
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