- /* Copyright 2019 Nick Brassel (tzarc)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include <stdint.h>
- #include <string.h>
- #if defined(EXTERNAL_EEPROM_WP_PIN)
- # include "gpio.h"
- #endif
-
- /*
- Note that the implementations of eeprom_XXXX_YYYY on AVR are normally
- provided by avr-libc. The same functions are reimplemented below and are
- rerouted to the external i2c equivalent.
-
- Seemingly, as this is compiled from within QMK, the object file generated
- during the build overrides the avr-libc implementation during the linking
- stage.
-
- On other platforms such as ARM, there are no provided implementations, so
- there is nothing to override during linkage.
- */
-
- #include "wait.h"
- #include "i2c_master.h"
- #include "eeprom.h"
- #include "eeprom_i2c.h"
-
- // #define DEBUG_EEPROM_OUTPUT
-
- #if defined(CONSOLE_ENABLE) && defined(DEBUG_EEPROM_OUTPUT)
- # include "timer.h"
- # include "debug.h"
- #endif // DEBUG_EEPROM_OUTPUT
-
- static inline void fill_target_address(uint8_t *buffer, const void *addr) {
- uintptr_t p = (uintptr_t)addr;
- for (int i = 0; i < EXTERNAL_EEPROM_ADDRESS_SIZE; ++i) {
- buffer[EXTERNAL_EEPROM_ADDRESS_SIZE - 1 - i] = p & 0xFF;
- p >>= 8;
- }
- }
-
- void eeprom_driver_init(void) {
- i2c_init();
- #if defined(EXTERNAL_EEPROM_WP_PIN)
- /* We are setting the WP pin to high in a way that requires at least two bit-flips to change back to 0 */
- gpio_write_pin(EXTERNAL_EEPROM_WP_PIN, 1);
- gpio_set_pin_input_high(EXTERNAL_EEPROM_WP_PIN);
- #endif
- }
-
- void eeprom_driver_erase(void) {
- #if defined(CONSOLE_ENABLE) && defined(DEBUG_EEPROM_OUTPUT)
- uint32_t start = timer_read32();
- #endif
-
- uint8_t buf[EXTERNAL_EEPROM_PAGE_SIZE];
- memset(buf, 0x00, EXTERNAL_EEPROM_PAGE_SIZE);
- for (uint32_t addr = 0; addr < EXTERNAL_EEPROM_BYTE_COUNT; addr += EXTERNAL_EEPROM_PAGE_SIZE) {
- eeprom_write_block(buf, (void *)(uintptr_t)addr, EXTERNAL_EEPROM_PAGE_SIZE);
- }
-
- #if defined(CONSOLE_ENABLE) && defined(DEBUG_EEPROM_OUTPUT)
- dprintf("EEPROM erase took %ldms to complete\n", ((long)(timer_read32() - start)));
- #endif
- }
-
- void eeprom_read_block(void *buf, const void *addr, size_t len) {
- uint8_t complete_packet[EXTERNAL_EEPROM_ADDRESS_SIZE];
- fill_target_address(complete_packet, addr);
-
- i2c_transmit(EXTERNAL_EEPROM_I2C_ADDRESS((uintptr_t)addr), complete_packet, EXTERNAL_EEPROM_ADDRESS_SIZE, 100);
- i2c_receive(EXTERNAL_EEPROM_I2C_ADDRESS((uintptr_t)addr), buf, len, 100);
-
- #if defined(CONSOLE_ENABLE) && defined(DEBUG_EEPROM_OUTPUT)
- dprintf("[EEPROM R] 0x%04X: ", ((int)addr));
- for (size_t i = 0; i < len; ++i) {
- dprintf(" %02X", (int)(((uint8_t *)buf)[i]));
- }
- dprintf("\n");
- #endif // DEBUG_EEPROM_OUTPUT
- }
-
- void eeprom_write_block(const void *buf, void *addr, size_t len) {
- uint8_t complete_packet[EXTERNAL_EEPROM_ADDRESS_SIZE + EXTERNAL_EEPROM_PAGE_SIZE];
- uint8_t * read_buf = (uint8_t *)buf;
- uintptr_t target_addr = (uintptr_t)addr;
-
- #if defined(EXTERNAL_EEPROM_WP_PIN)
- gpio_set_pin_output(EXTERNAL_EEPROM_WP_PIN);
- gpio_write_pin(EXTERNAL_EEPROM_WP_PIN, 0);
- #endif
-
- while (len > 0) {
- uintptr_t page_offset = target_addr % EXTERNAL_EEPROM_PAGE_SIZE;
- int write_length = EXTERNAL_EEPROM_PAGE_SIZE - page_offset;
- if (write_length > len) {
- write_length = len;
- }
-
- fill_target_address(complete_packet, (const void *)target_addr);
- for (uint8_t i = 0; i < write_length; i++) {
- complete_packet[EXTERNAL_EEPROM_ADDRESS_SIZE + i] = read_buf[i];
- }
-
- #if defined(CONSOLE_ENABLE) && defined(DEBUG_EEPROM_OUTPUT)
- dprintf("[EEPROM W] 0x%04X: ", ((int)target_addr));
- for (uint8_t i = 0; i < write_length; i++) {
- dprintf(" %02X", (int)(read_buf[i]));
- }
- dprintf("\n");
- #endif // DEBUG_EEPROM_OUTPUT
-
- i2c_transmit(EXTERNAL_EEPROM_I2C_ADDRESS((uintptr_t)addr), complete_packet, EXTERNAL_EEPROM_ADDRESS_SIZE + write_length, 100);
- wait_ms(EXTERNAL_EEPROM_WRITE_TIME);
-
- read_buf += write_length;
- target_addr += write_length;
- len -= write_length;
- }
-
- #if defined(EXTERNAL_EEPROM_WP_PIN)
- /* We are setting the WP pin to high in a way that requires at least two bit-flips to change back to 0 */
- gpio_write_pin(EXTERNAL_EEPROM_WP_PIN, 1);
- gpio_set_pin_input_high(EXTERNAL_EEPROM_WP_PIN);
- #endif
- }
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