From d13ada11622977bcc0b530212b4405229805016d Mon Sep 17 00:00:00 2001 From: Nick Brassel Date: Wed, 6 Nov 2019 08:04:50 +1100 Subject: Add customisable EEPROM driver selection (#7274) - uprintf -> dprintf - Fix atsam "vendor" eeprom. - Bump Kinetis K20x to 64 bytes, too. - Rollback Kinetis to 32 bytes as partitioning can only be done once. Add warning about changing the value. - Change RAM-backed "fake" EEPROM implementations to match eeconfig's current usage. - Add 24LC128 by request. --- drivers/eeprom/eeprom_i2c.c | 120 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 drivers/eeprom/eeprom_i2c.c (limited to 'drivers/eeprom/eeprom_i2c.c') diff --git a/drivers/eeprom/eeprom_i2c.c b/drivers/eeprom/eeprom_i2c.c new file mode 100644 index 0000000000..03dbc5e516 --- /dev/null +++ b/drivers/eeprom/eeprom_i2c.c @@ -0,0 +1,120 @@ +/* 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 . + */ + +#include +#include + +/* + 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 + +#ifdef DEBUG_EEPROM_OUTPUT +# include "print.h" +#endif // DEBUG_EEPROM_OUTPUT + +static inline void init_i2c_if_required(void) { + static int done = 0; + if (!done) { + i2c_init(); + done = 1; + } +} + +static inline void fill_target_address(uint8_t *buffer, const void *addr) { + intptr_t p = (intptr_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) {} + +void eeprom_driver_erase(void) { + uint8_t buf[EXTERNAL_EEPROM_PAGE_SIZE]; + memset(buf, 0x00, EXTERNAL_EEPROM_PAGE_SIZE); + for (intptr_t addr = 0; addr < EXTERNAL_EEPROM_BYTE_COUNT; addr += EXTERNAL_EEPROM_PAGE_SIZE) { + eeprom_write_block(buf, (void *)addr, EXTERNAL_EEPROM_PAGE_SIZE); + } +} + +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); + + init_i2c_if_required(); + i2c_transmit(EXTERNAL_EEPROM_I2C_ADDRESS((intptr_t)addr), complete_packet, EXTERNAL_EEPROM_ADDRESS_SIZE, 100); + i2c_receive(EXTERNAL_EEPROM_I2C_ADDRESS((intptr_t)addr), buf, len, 100); + +#ifdef 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; + intptr_t target_addr = (intptr_t)addr; + + init_i2c_if_required(); + while (len > 0) { + intptr_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]; + } + +#ifdef 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((intptr_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; + } +} -- cgit v1.2.3