/* Copyright 2020 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 #include #include "eeprom_driver.h" #include "eeprom_stm32_L0_L1.h" #define EEPROM_BASE_ADDR 0x08080000 #define EEPROM_ADDR(offset) (EEPROM_BASE_ADDR + (offset)) #define EEPROM_PTR(offset) ((__IO uint8_t *)EEPROM_ADDR(offset)) #define EEPROM_BYTE(location, offset) (*(EEPROM_PTR(((uint32_t)location) + ((uint32_t)offset)))) #define EEPROM_WORD(location) (*(__IO uint32_t *)EEPROM_PTR(location)) #define BUFFER_BYTE(buffer, offset) (*(((uint8_t *)buffer) + offset)) #define FLASH_PEKEY1 0x89ABCDEF #define FLASH_PEKEY2 0x02030405 static inline void STM32_L0_L1_EEPROM_WaitNotBusy(void) { while (FLASH->SR & FLASH_SR_BSY) { __WFI(); } } static inline void STM32_L0_L1_EEPROM_Unlock(void) { STM32_L0_L1_EEPROM_WaitNotBusy(); if (FLASH->PECR & FLASH_PECR_PELOCK) { FLASH->PEKEYR = FLASH_PEKEY1; FLASH->PEKEYR = FLASH_PEKEY2; } } static inline void STM32_L0_L1_EEPROM_Lock(void) { STM32_L0_L1_EEPROM_WaitNotBusy(); FLASH->PECR |= FLASH_PECR_PELOCK; } void eeprom_driver_init(void) {} void eeprom_driver_format(bool erase) { if (erase) { eeprom_driver_erase(); } } void eeprom_driver_erase(void) { STM32_L0_L1_EEPROM_Unlock(); for (size_t offset = 0; offset < STM32_ONBOARD_EEPROM_SIZE; offset += sizeof(uint32_t)) { #ifdef QMK_MCU_SERIES_STM32L0XX FLASH->PECR |= FLASH_PECR_ERASE | FLASH_PECR_DATA; #endif EEPROM_WORD(offset) = (uint32_t)0; STM32_L0_L1_EEPROM_WaitNotBusy(); #ifdef QMK_MCU_SERIES_STM32L0XX FLASH->PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_DATA); #endif } STM32_L0_L1_EEPROM_Lock(); } void eeprom_read_block(void *buf, const void *addr, size_t len) { for (size_t offset = 0; offset < len; ++offset) { // Drop out if we've hit the limit of the EEPROM if ((((uint32_t)addr) + offset) >= STM32_ONBOARD_EEPROM_SIZE) { break; } STM32_L0_L1_EEPROM_WaitNotBusy(); BUFFER_BYTE(buf, offset) = EEPROM_BYTE(addr, offset); } } void eeprom_write_block(const void *buf, void *addr, size_t len) { // use word-aligned write to overcome issues with writing null bytes uint32_t start_addr = (uint32_t)addr; if (start_addr >= (STM32_ONBOARD_EEPROM_SIZE)) { return; } uint32_t max_len = (STM32_ONBOARD_EEPROM_SIZE)-start_addr; if (len > max_len) { len = max_len; } uint32_t end_addr = start_addr + len; uint32_t aligned_start = start_addr & ~0x3; uint32_t aligned_end = (end_addr + 3) & ~0x3; STM32_L0_L1_EEPROM_Unlock(); for (uint32_t word_addr = aligned_start; word_addr < aligned_end; word_addr += 4) { uint32_t existing_word = EEPROM_WORD(word_addr); uint32_t new_word = existing_word; // Update the relevant bytes in the word for (int i = 0; i < 4; i++) { uint32_t byte_addr = word_addr + i; if (byte_addr >= start_addr && byte_addr < end_addr) { uint8_t new_byte = BUFFER_BYTE(buf, byte_addr - start_addr); new_word = (new_word & ~(0xFFU << (i * 8))) | ((uint32_t)new_byte << (i * 8)); } } // Only write if the word has changed if (new_word != existing_word) { STM32_L0_L1_EEPROM_WaitNotBusy(); EEPROM_WORD(word_addr) = new_word; } } STM32_L0_L1_EEPROM_Lock(); }