/* 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 <http://www.gnu.org/licenses/>. */ #include <stdint.h> #include <string.h> #include "hal.h" #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 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_erase(void) { STM32_L0_L1_EEPROM_Unlock(); for (size_t offset = 0; offset < STM32_ONBOARD_EEPROM_SIZE; offset += sizeof(uint32_t)) { FLASH->PECR |= FLASH_PECR_ERASE | FLASH_PECR_DATA; *(__IO uint32_t *)EEPROM_ADDR(offset) = (uint32_t)0; STM32_L0_L1_EEPROM_WaitNotBusy(); FLASH->PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_DATA); } 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) { STM32_L0_L1_EEPROM_Unlock(); 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(); EEPROM_BYTE(addr, offset) = BUFFER_BYTE(buf, offset); } STM32_L0_L1_EEPROM_Lock(); }