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Merge pull request ARMmbed#4474 from kegilbert/stm32_l0_flash_api-rebase
STM32 L0: Add Flash API support - Rebase
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,143 @@ | ||
| /* mbed Microcontroller Library | ||
| * Copyright (c) 2017 ARM Limited | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| #include "flash_api.h" | ||
| #include "mbed_critical.h" | ||
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| #if DEVICE_FLASH | ||
| #include "mbed_assert.h" | ||
| #include "cmsis.h" | ||
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| /* L0 targets embed 32 pages sectors */ | ||
| #define NUM_PAGES_IN_SECTOR 32 | ||
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| int32_t flash_init(flash_t *obj) | ||
| { | ||
| /* Unlock the Flash to enable the flash control register access *************/ | ||
| HAL_FLASH_Unlock(); | ||
| return 0; | ||
| } | ||
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| int32_t flash_free(flash_t *obj) | ||
| { | ||
| /* Lock the Flash to disable the flash control register access (recommended | ||
| * to protect the FLASH memory against possible unwanted operation) *********/ | ||
| HAL_FLASH_Lock(); | ||
| return 0; | ||
| } | ||
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| int32_t flash_erase_sector(flash_t *obj, uint32_t address) | ||
| { | ||
| uint32_t FirstPage = 0; | ||
| uint32_t PAGEError = 0; | ||
| FLASH_EraseInitTypeDef EraseInitStruct; | ||
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| if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) { | ||
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| return -1; | ||
| } | ||
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| /* Clear OPTVERR bit set on virgin samples */ | ||
| __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR); | ||
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| /* MBED HAL erases 1 sector at a time */ | ||
| /* Fill EraseInit structure*/ | ||
| EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES; | ||
| EraseInitStruct.PageAddress = address; | ||
| EraseInitStruct.NbPages = NUM_PAGES_IN_SECTOR; | ||
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| /* Note: If an erase operation in Flash memory also concerns data in the data or instruction cache, | ||
| you have to make sure that these data are rewritten before they are accessed during code | ||
| execution. If this cannot be done safely, it is recommended to flush the caches by setting the | ||
| DCRST and ICRST bits in the FLASH_CR register. */ | ||
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| if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK) { | ||
| return -1; | ||
| } else { | ||
| return 0; | ||
| } | ||
| } | ||
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| int32_t flash_program_page(flash_t *obj, uint32_t address, | ||
| const uint8_t *data, uint32_t size) | ||
| { | ||
| uint32_t StartAddress = 0; | ||
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| if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) { | ||
| return -1; | ||
| } | ||
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| if ((size % 4) != 0) { | ||
| /* L4 flash devices can only be programmed 64bits/8 bytes at a time */ | ||
| return -1; | ||
| } | ||
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| /* Program the user Flash area word by word */ | ||
| StartAddress = address; | ||
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| /* HW needs an aligned address to program flash, which data | ||
| * parameters doesn't ensure */ | ||
| if ((uint32_t) data % 4 != 0) { | ||
| volatile uint32_t data32; | ||
| while (address < (StartAddress + size)) { | ||
| for (uint8_t i =0; i < 4; i++) { | ||
| *(((uint8_t *) &data32) + i) = *(data + i); | ||
| } | ||
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| if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data32) == HAL_OK) { | ||
| address = address + 4; | ||
| data = data + 4; | ||
| } else { | ||
| return -1; | ||
| } | ||
| } | ||
| } else { /* case where data is aligned, so let's avoid any copy */ | ||
| while (address < (StartAddress + size)) { | ||
| if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, *((uint32_t*) data)) == HAL_OK) { | ||
| address = address + 4; | ||
| data = data + 4; | ||
| } else { | ||
| return -1; | ||
| } | ||
| } | ||
| } | ||
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| return 0; | ||
| } | ||
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| uint32_t flash_get_sector_size(const flash_t *obj, uint32_t address) { | ||
| /* considering 1 sector = 1 page */ | ||
| if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) { | ||
| return MBED_FLASH_INVALID_SIZE; | ||
| } else { | ||
| return (NUM_PAGES_IN_SECTOR * FLASH_PAGE_SIZE); | ||
| } | ||
| } | ||
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| uint32_t flash_get_page_size(const flash_t *obj) { | ||
| /* considering 1 sector = 1 page */ | ||
| return FLASH_PAGE_SIZE; | ||
| } | ||
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| uint32_t flash_get_start_address(const flash_t *obj) { | ||
| return FLASH_BASE; | ||
| } | ||
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| uint32_t flash_get_size(const flash_t *obj) { | ||
| return FLASH_SIZE; | ||
| } | ||
|
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| #endif |
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