Diff: targets/TARGET_STM/TARGET_STM32L0/flash_api.c

Revision:

167:e84263d55307

Child:

168:9672193075cf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32L0/flash_api.c	Wed Jun 21 17:46:44 2017 +0100
@@ -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.
+ */
+
+#include "flash_api.h"
+#include "mbed_critical.h"
+
+#if DEVICE_FLASH
+#include "mbed_assert.h"
+#include "cmsis.h"
+
+/*  L0 targets embed 32 pages sectors */
+#define NUM_PAGES_IN_SECTOR 32
+
+int32_t flash_init(flash_t *obj)
+{
+    /* Unlock the Flash to enable the flash control register access *************/
+    HAL_FLASH_Unlock();
+    return 0;
+}
+
+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;
+}
+
+int32_t flash_erase_sector(flash_t *obj, uint32_t address)
+{
+    uint32_t FirstPage = 0;
+    uint32_t PAGEError = 0;
+    FLASH_EraseInitTypeDef EraseInitStruct;
+
+    if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
+
+        return -1;
+    }
+
+    /* Clear OPTVERR bit set on virgin samples */
+    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);
+
+    /* 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;
+
+    /* 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. */
+
+    if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK) {
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+int32_t flash_program_page(flash_t *obj, uint32_t address,
+        const uint8_t *data, uint32_t size)
+{
+    uint32_t StartAddress = 0;
+
+    if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
+        return -1;
+    }
+
+    if ((size % 4) != 0) {
+        /* L4 flash devices can only be programmed 64bits/8 bytes at a time */
+        return -1;
+    }
+
+    /* Program the user Flash area word by word */
+    StartAddress = address;
+
+    /*  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);
+            }
+
+            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;
+            }
+        }
+    }
+
+    return 0;
+}
+
+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);
+    }
+}
+
+uint32_t flash_get_page_size(const flash_t *obj) {
+    /*  considering 1 sector = 1 page */
+    return FLASH_PAGE_SIZE;
+}
+
+uint32_t flash_get_start_address(const flash_t *obj) {
+    return FLASH_BASE;
+}
+
+uint32_t flash_get_size(const flash_t *obj) {
+    return FLASH_SIZE;
+}
+
+#endif