Added support for FLASH API

targets/TARGET_STM/TARGET_STM32G4/flash_api.c

@@ -0,0 +1,296 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ * Copyright (c) 2017 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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"
+
+/**
+  * @brief  Gets the page of a given address
+  * @param  Addr: Address of the FLASH Memory
+  * @retval The page of a given address
+  */
+static uint32_t GetPage(uint32_t Addr)
+{
+    uint32_t page = 0;
+
+    if (Addr < (FLASH_BASE + FLASH_BANK_SIZE)) {
+        /* Bank 1 */
+        page = (Addr - FLASH_BASE) / FLASH_PAGE_SIZE;
+    } else {
+        /* Bank 2 */
+        page = (Addr - (FLASH_BASE + FLASH_BANK_SIZE)) / FLASH_PAGE_SIZE;
+    }
+
+    return page;
+}
+
+/**
+  * @brief  Gets the bank of a given address
+  * @param  Addr: Address of the FLASH Memory
+  * @retval The bank of a given address
+  */
+static uint32_t GetBank(uint32_t Addr)
+{
+    uint32_t bank = 0;
+#if defined(SYSCFG_MEMRMP_FB_MODE)
+    if (READ_BIT(SYSCFG->MEMRMP, SYSCFG_MEMRMP_FB_MODE) == 0) {
+        /* No Bank swap */
+        if (Addr < (FLASH_BASE + FLASH_BANK_SIZE)) {
+            bank = FLASH_BANK_1;
+        } else {
+            bank = FLASH_BANK_2;
+        }
+    } else {
+        /* Bank swap */
+        if (Addr < (FLASH_BASE + FLASH_BANK_SIZE)) {
+            bank = FLASH_BANK_2;
+        } else {
+            bank = FLASH_BANK_1;
+        }
+    }
+#else
+    /* Device like L432KC */
+    bank = FLASH_BANK_1;
+#endif
+
+    return bank;
+}
+
+/** Initialize the flash peripheral and the flash_t object
+ *
+ * @param obj The flash object
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_init(flash_t *obj)
+{
+    return 0;
+}
+
+/** Uninitialize the flash peripheral and the flash_t object
+ *
+ * @param obj The flash object
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_free(flash_t *obj)
+{
+    return 0;
+}
+
+static int32_t flash_unlock(void)
+{
+    /* Allow Access to Flash control registers and user Falsh */
+    if (HAL_FLASH_Unlock()) {
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+static int32_t flash_lock(void)
+{
+    /* Disable the Flash option control register access (recommended to protect
+    the option Bytes against possible unwanted operations) */
+    if (HAL_FLASH_Lock()) {
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+/** Erase one sector starting at defined address
+ *
+ * The address should be at sector boundary. This function does not do any check for address alignments
+ * @param obj The flash object
+ * @param address The sector starting address
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_erase_sector(flash_t *obj, uint32_t address)
+{
+    uint32_t FirstPage = 0, BankNumber = 0;
+    uint32_t PAGEError = 0;
+    FLASH_EraseInitTypeDef EraseInitStruct;
+    int32_t status = 0;
+
+    if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
+
+        return -1;
+    }
+
+    if (flash_unlock() != HAL_OK) {
+        return -1;
+    }
+
+    /* Clear error programming flags */
+    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
+
+    /* Get the 1st page to erase */
+    FirstPage = GetPage(address);
+    /* MBED HAL erases 1 page  / sector at a time */
+    /* Get the bank */
+    BankNumber = GetBank(address);
+    /* Fill EraseInit structure*/
+    EraseInitStruct.TypeErase   = FLASH_TYPEERASE_PAGES;
+    EraseInitStruct.Banks       = BankNumber;
+    EraseInitStruct.Page        = FirstPage;
+    EraseInitStruct.NbPages     = 1;
+
+    /* 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) {
+        status = -1;
+    }
+
+    flash_lock();
+
+    return status;
+}
+
+/** Program one page starting at defined address
+ *
+ * The page should be at page boundary, should not cross multiple sectors.
+ * This function does not do any check for address alignments or if size
+ * is aligned to a page size.
+ * @param obj The flash object
+ * @param address The sector starting address
+ * @param data The data buffer to be programmed
+ * @param size The number of bytes to program
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_program_page(flash_t *obj, uint32_t address,
+                           const uint8_t *data, uint32_t size)
+{
+    uint32_t StartAddress = 0;
+    int32_t status = 0;
+
+    if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
+        return -1;
+    }
+
+    if ((size % 8) != 0) {
+        /* L4 flash devices can only be programmed 64bits/8 bytes at a time */
+        return -1;
+    }
+
+    if (flash_unlock() != HAL_OK) {
+        return -1;
+    }
+
+    /* Clear error programming flags */
+    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
+
+    /* 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 % 8 != 0) {
+        volatile uint64_t data64;
+        while ((address < (StartAddress + size)) && (status == 0)) {
+            for (uint8_t i = 0; i < 8; i++) {
+                *(((uint8_t *) &data64) + i) = *(data + i);
+            }
+
+            if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data64)
+                    == HAL_OK) {
+                address = address + 8;
+                data = data + 8;
+            } else {
+                status = -1;
+            }
+        }
+    } else { /*  case where data is aligned, so let's avoid any copy */
+        while ((address < (StartAddress + size)) && (status == 0)) {
+            if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address,
+                                  *((uint64_t *) data))
+                    == HAL_OK) {
+                address = address + 8;
+                data = data + 8;
+            } else {
+                status = -1;
+            }
+        }
+    }
+
+    flash_lock();
+
+    return status;
+}
+
+/** Get sector size
+ *
+ * @param obj The flash object
+ * @param address The sector starting address
+ * @return The size of a sector
+ */
+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 FLASH_PAGE_SIZE;
+    }
+}
+
+/** Get page size
+ *
+ * @param obj The flash object
+ * @param address The page starting address
+ * @return The size of a page
+ */
+uint32_t flash_get_page_size(const flash_t *obj)
+{
+    /*  Page size is the minimum programable size, which 8 bytes */
+    return 8;
+}
+
+/** Get start address for the flash region
+ *
+ * @param obj The flash object
+ * @return The start address for the flash region
+ */
+uint32_t flash_get_start_address(const flash_t *obj)
+{
+    return FLASH_BASE;
+}
+
+/** Get the flash region size
+ *
+ * @param obj The flash object
+ * @return The flash region size
+ */
+uint32_t flash_get_size(const flash_t *obj)
+{
+    return FLASH_SIZE;
+}
+
+uint8_t flash_get_erase_value(const flash_t *obj)
+{
+    (void)obj;
+
+    return 0xFF;
+}
+
+#endif

targets/TARGET_STM/TARGET_STM32G4/objects.h

@@ -118,12 +118,34 @@ struct i2c_s {
 #endif
 };
 
+struct dac_s {
+    DACName dac;
+    PinName pin;
+    uint32_t channel;
+    DAC_HandleTypeDef handle;
+};
+
 struct analogin_s {
     ADC_HandleTypeDef handle;
     PinName pin;
     uint8_t channel;
 };
 
+#if DEVICE_CAN
+struct can_s {
+    CAN_HandleTypeDef CanHandle;
+    int index;
+    int hz;
+};
+#endif
+
+#if DEVICE_FLASH
+struct flash_s {
+    /*  nothing to be stored for now */
+    uint32_t dummy;
+};
+#endif
+
 struct trng_s {
     RNG_HandleTypeDef handle;
 };

targets/TARGET_STM/TARGET_STM32G4/todo.txt

@@ -0,0 +1 @@
+Still to be added: CAN, USBDEVICE, ANALOGOUT, QSPI, CRC(?), TRNG

targets/targets.json

@@ -7559,6 +7559,7 @@
             "lpticker_delay_ticks": 0
         },
         "device_has_add": [
+            "FLASH",
             "MPU"
         ],
         "detect_code": [