121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
/* Copyright 2019 Nick Brassel (tzarc)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <string.h>
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/*
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Note that the implementations of eeprom_XXXX_YYYY on AVR are normally
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provided by avr-libc. The same functions are reimplemented below and are
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rerouted to the external i2c equivalent.
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Seemingly, as this is compiled from within QMK, the object file generated
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during the build overrides the avr-libc implementation during the linking
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stage.
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On other platforms such as ARM, there are no provided implementations, so
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there is nothing to override during linkage.
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*/
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#include "wait.h"
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#include "i2c_master.h"
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#include "eeprom.h"
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#include "eeprom_i2c.h"
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// #define DEBUG_EEPROM_OUTPUT
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#ifdef DEBUG_EEPROM_OUTPUT
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# include "print.h"
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#endif // DEBUG_EEPROM_OUTPUT
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static inline void init_i2c_if_required(void) {
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static int done = 0;
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if (!done) {
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i2c_init();
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done = 1;
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}
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}
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static inline void fill_target_address(uint8_t *buffer, const void *addr) {
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intptr_t p = (intptr_t)addr;
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for (int i = 0; i < EXTERNAL_EEPROM_ADDRESS_SIZE; ++i) {
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buffer[EXTERNAL_EEPROM_ADDRESS_SIZE - 1 - i] = p & 0xFF;
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p >>= 8;
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}
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}
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void eeprom_driver_init(void) {}
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void eeprom_driver_erase(void) {
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uint8_t buf[EXTERNAL_EEPROM_PAGE_SIZE];
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memset(buf, 0x00, EXTERNAL_EEPROM_PAGE_SIZE);
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for (intptr_t addr = 0; addr < EXTERNAL_EEPROM_BYTE_COUNT; addr += EXTERNAL_EEPROM_PAGE_SIZE) {
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eeprom_write_block(buf, (void *)addr, EXTERNAL_EEPROM_PAGE_SIZE);
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}
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}
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void eeprom_read_block(void *buf, const void *addr, size_t len) {
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uint8_t complete_packet[EXTERNAL_EEPROM_ADDRESS_SIZE];
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fill_target_address(complete_packet, addr);
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init_i2c_if_required();
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i2c_transmit(EXTERNAL_EEPROM_I2C_ADDRESS((intptr_t)addr), complete_packet, EXTERNAL_EEPROM_ADDRESS_SIZE, 100);
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i2c_receive(EXTERNAL_EEPROM_I2C_ADDRESS((intptr_t)addr), buf, len, 100);
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#ifdef DEBUG_EEPROM_OUTPUT
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dprintf("[EEPROM R] 0x%04X: ", ((int)addr));
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for (size_t i = 0; i < len; ++i) {
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dprintf(" %02X", (int)(((uint8_t *)buf)[i]));
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}
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dprintf("\n");
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#endif // DEBUG_EEPROM_OUTPUT
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}
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void eeprom_write_block(const void *buf, void *addr, size_t len) {
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uint8_t complete_packet[EXTERNAL_EEPROM_ADDRESS_SIZE + EXTERNAL_EEPROM_PAGE_SIZE];
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uint8_t *read_buf = (uint8_t *)buf;
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intptr_t target_addr = (intptr_t)addr;
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init_i2c_if_required();
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while (len > 0) {
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intptr_t page_offset = target_addr % EXTERNAL_EEPROM_PAGE_SIZE;
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int write_length = EXTERNAL_EEPROM_PAGE_SIZE - page_offset;
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if (write_length > len) {
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write_length = len;
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}
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fill_target_address(complete_packet, (const void *)target_addr);
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for (uint8_t i = 0; i < write_length; i++) {
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complete_packet[EXTERNAL_EEPROM_ADDRESS_SIZE + i] = read_buf[i];
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}
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#ifdef DEBUG_EEPROM_OUTPUT
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dprintf("[EEPROM W] 0x%04X: ", ((int)target_addr));
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for (uint8_t i = 0; i < write_length; i++) {
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dprintf(" %02X", (int)(read_buf[i]));
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}
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dprintf("\n");
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#endif // DEBUG_EEPROM_OUTPUT
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i2c_transmit(EXTERNAL_EEPROM_I2C_ADDRESS((intptr_t)addr), complete_packet, EXTERNAL_EEPROM_ADDRESS_SIZE + write_length, 100);
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wait_ms(EXTERNAL_EEPROM_WRITE_TIME);
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read_buf += write_length;
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target_addr += write_length;
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len -= write_length;
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}
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}
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