diff options
| -rw-r--r-- | common_features.mk | 4 | ||||
| -rw-r--r-- | docs/eeprom_driver.md | 12 | ||||
| -rw-r--r-- | drivers/eeprom/eeprom_stm32_L0_L1.c | 96 | ||||
| -rw-r--r-- | drivers/eeprom/eeprom_stm32_L0_L1.h | 33 |
4 files changed, 140 insertions, 5 deletions
diff --git a/common_features.mk b/common_features.mk index fe65974e7a..b71dbc77e2 100644 --- a/common_features.mk +++ b/common_features.mk @@ -141,6 +141,10 @@ else SRC += $(PLATFORM_COMMON_DIR)/flash_stm32.c OPT_DEFS += -DEEPROM_EMU_STM32F072xB OPT_DEFS += -DSTM32_EEPROM_ENABLE + else ifneq ($(filter $(MCU_SERIES),STM32L0xx STM32L1xx),) + OPT_DEFS += -DEEPROM_DRIVER + COMMON_VPATH += $(DRIVER_PATH)/eeprom + SRC += eeprom_driver.c eeprom_stm32_L0_L1.c else # This will effectively work the same as "transient" if not supported by the chip SRC += $(PLATFORM_COMMON_DIR)/eeprom_teensy.c diff --git a/docs/eeprom_driver.md b/docs/eeprom_driver.md index dd12d8ec7b..5a91a7c2da 100644 --- a/docs/eeprom_driver.md +++ b/docs/eeprom_driver.md @@ -2,14 +2,16 @@ The EEPROM driver can be swapped out depending on the needs of the keyboard, or whether extra hardware is present. -Driver | Description ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -`EEPROM_DRIVER = vendor` | Uses the on-chip driver provided by the chip manufacturer. For AVR, this is provided by avr-libc. This is supported on ARM for a subset of chips -- STM32F3xx, STM32F1xx, and STM32F072xB will be emulated by writing to flash. Other chips will generally act as "transient" below. -`EEPROM_DRIVER = i2c` | Supports writing to I2C-based 24xx EEPROM chips. See the driver section below. -`EEPROM_DRIVER = transient` | Fake EEPROM driver -- supports reading/writing to RAM, and will be discarded when power is lost. +Driver | Description +-----------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- +`EEPROM_DRIVER = vendor` (default) | Uses the on-chip driver provided by the chip manufacturer. For AVR, this is provided by avr-libc. This is supported on ARM for a subset of chips -- STM32F3xx, STM32F1xx, and STM32F072xB will be emulated by writing to flash. STM32L0xx and STM32L1xx will use the onboard dedicated true EEPROM. Other chips will generally act as "transient" below. +`EEPROM_DRIVER = i2c` | Supports writing to I2C-based 24xx EEPROM chips. See the driver section below. +`EEPROM_DRIVER = transient` | Fake EEPROM driver -- supports reading/writing to RAM, and will be discarded when power is lost. ## Vendor Driver Configuration +!> Resetting EEPROM using an STM32L0/L1 device takes up to 1 second for every 1kB of internal EEPROM used. + No configurable options are available. ## I2C Driver Configuration diff --git a/drivers/eeprom/eeprom_stm32_L0_L1.c b/drivers/eeprom/eeprom_stm32_L0_L1.c new file mode 100644 index 0000000000..b62e6ffd76 --- /dev/null +++ b/drivers/eeprom/eeprom_stm32_L0_L1.c @@ -0,0 +1,96 @@ +/* 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(); +} diff --git a/drivers/eeprom/eeprom_stm32_L0_L1.h b/drivers/eeprom/eeprom_stm32_L0_L1.h new file mode 100644 index 0000000000..a35defca8b --- /dev/null +++ b/drivers/eeprom/eeprom_stm32_L0_L1.h @@ -0,0 +1,33 @@ +/* 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/>. + */ + +#pragma once + +/* + The size used by the STM32 L0/L1 EEPROM driver. +*/ +#ifndef STM32_ONBOARD_EEPROM_SIZE +# ifdef VIA_ENABLE +# define STM32_ONBOARD_EEPROM_SIZE 1024 +# else +# include "eeconfig.h" +# define STM32_ONBOARD_EEPROM_SIZE (((EECONFIG_SIZE + 3) / 4) * 4) // based off eeconfig's current usage, aligned to 4-byte sizes, to deal with LTO and EEPROM page sizing +# endif +#endif + +#if STM32_ONBOARD_EEPROM_SIZE > 128 +# pragma message("Please note: resetting EEPROM using an STM32L0/L1 device takes up to 1 second for every 1kB of internal EEPROM used.") +#endif |