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- /* 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();
- }
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