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Add Flash memory driver for STM32 embedded flash. #452
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,262 @@ | ||
| ------------------------------------------------------------------------------ | ||
| -- -- | ||
| -- Copyright (C) 2026, AdaCore -- | ||
| -- -- | ||
| -- Redistribution and use in source and binary forms, with or without -- | ||
| -- modification, are permitted provided that the following conditions are -- | ||
| -- met: -- | ||
| -- 1. Redistributions of source code must retain the above copyright -- | ||
| -- notice, this list of conditions and the following disclaimer. -- | ||
| -- 2. Redistributions in binary form must reproduce the above copyright -- | ||
| -- notice, this list of conditions and the following disclaimer in -- | ||
| -- the documentation and/or other materials provided with the -- | ||
| -- distribution. -- | ||
| -- 3. Neither the name of the copyright holder nor the names of its -- | ||
| -- contributors may be used to endorse or promote products derived -- | ||
| -- from this software without specific prior written permission. -- | ||
| -- -- | ||
| -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -- | ||
| -- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -- | ||
| -- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -- | ||
| -- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -- | ||
| -- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -- | ||
| -- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -- | ||
| -- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -- | ||
| -- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -- | ||
| -- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -- | ||
| -- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -- | ||
| -- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -- | ||
| -- -- | ||
| ------------------------------------------------------------------------------ | ||
|
|
||
| with Memory_Barriers; | ||
|
|
||
| with STM32_SVD.FLASH; | ||
|
|
||
| package body STM32.Flash is | ||
|
|
||
| FLASH_Periph : STM32_SVD.FLASH.FLASH_Peripheral renames | ||
| STM32_SVD.FLASH.FLASH_Periph; | ||
|
|
||
| Whole_Flash : constant HAL.Flash.Memory_Region := (0, 16#F_FFFF#); | ||
|
|
||
| subtype Memory_Region is HAL.UInt8_Array (0 .. 16#F_FFFF#); | ||
|
|
||
| procedure Wait_Flash; | ||
| -- Spin CPU while the flash is busy | ||
|
|
||
| --------------------- | ||
| -- Erasable_Region -- | ||
| --------------------- | ||
|
|
||
| overriding function Erasable_Region | ||
| (This : in out Flash_Memory; | ||
| Region : HAL.Flash.Memory_Region) | ||
| return HAL.Flash.Memory_Region | ||
| is | ||
| Result : HAL.Flash.Memory_Region; | ||
| begin | ||
| case Region.From is | ||
| when 0 .. 16#FFFF# => | ||
| Result.From := Region.From / (16 * 1024) * 16 * 1024; | ||
| Result.To := Region.From + 16 * 1024 - 1; | ||
| when 16#1_0000# .. 16#1_FFFF# => | ||
| Result.From := 16#1_0000#; | ||
| Result.To := 16#1_FFFF#; | ||
| when 16#2_0000# .. 16#F_FFFF# => | ||
| Result.From := Region.From / (128 * 1024) * 128 * 1024; | ||
| Result.To := Region.From + 128 * 1024 - 1; | ||
| when others => | ||
| Result := Whole_Flash; | ||
| end case; | ||
|
|
||
| return | ||
| (if Region.To in Result.From .. Result.To | ||
| then Result | ||
| else Whole_Flash); | ||
| end Erasable_Region; | ||
|
|
||
| ----------- | ||
| -- Erase -- | ||
| ----------- | ||
|
|
||
| overriding procedure Erase | ||
| (This : in out Flash_Memory; | ||
| Region : HAL.Flash.Memory_Region; | ||
| Success : out Boolean) | ||
| is | ||
| Sector : Natural range 0 .. 27; | ||
| -- We have 28 sectors, but 4 of them (12..15) are not allowed, so | ||
| -- total sector count is 24 (RM90 enumerates them from 0 to 23). | ||
| -- Actual codes in the CR.SNB register are 0..11 and 16..27. | ||
|
|
||
| Size : Positive; | ||
| begin | ||
| if Region = Whole_Flash then | ||
| raise Program_Error with "Unimplemented"; | ||
| end if; | ||
|
|
||
| case Region.From is | ||
| when 16#0_0000# .. 16#0_FFFF# => | ||
| Size := 16 * 1024; | ||
| Sector := (Region.From - 16#0_0000#) / Size; | ||
|
|
||
| when 16#1_0000# .. 16#1_FFFF# => | ||
| Size := 64 * 1024; | ||
| Sector := 4; | ||
|
|
||
| when 16#2_0000# .. 16#F_FFFF# => | ||
| Size := 128 * 1024; | ||
| Sector := 5 + (Region.From - 16#2_0000#) / Size; | ||
|
|
||
| when others => | ||
| Success := False; | ||
| return; | ||
| end case; | ||
|
|
||
| Sector := Sector + (This.Bank - 1) * 16; | ||
|
|
||
| Unlock; | ||
|
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| Wait_Flash; | ||
|
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||
| FLASH_Periph.SR.EOP := True; -- Clear interrupt flag | ||
|
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| FLASH_Periph.CR := | ||
| (LOCK => False, -- (No-)Lock | ||
| SER => True, -- Sector erase | ||
| SNB => STM32_SVD.FLASH.CR_SNB_Field (Sector), | ||
| PSIZE => 2, -- Parallelism size x32 | ||
| STRT => True, -- Start | ||
| EOPIE => False, -- interrupt on EOP bit = 1 | ||
| ERRIE => False, | ||
| others => <>); | ||
|
|
||
| Wait_Flash; | ||
| Lock; | ||
|
|
||
| Success := True; | ||
| end Erase; | ||
|
|
||
| overriding function Is_Busy (This : Flash_Memory) return Boolean is | ||
| (FLASH_Periph.SR.BSY); | ||
|
|
||
| ----------- | ||
| -- Write -- | ||
| ----------- | ||
|
|
||
| overriding procedure Write | ||
| (This : in out Flash_Memory; | ||
| Offset : Natural; | ||
| Data : HAL.UInt8_Array; | ||
| Success : out Boolean) | ||
| is | ||
| function Get_Word (J : Natural) return HAL.UInt32 is | ||
| (HAL.UInt32 (Data (Data'First + 4 * J)) + | ||
| HAL.Shift_Left (HAL.UInt32 (Data (Data'First + 4 * J + 1)), 8) + | ||
| HAL.Shift_Left (HAL.UInt32 (Data (Data'First + 4 * J + 2)), 16) + | ||
| HAL.Shift_Left (HAL.UInt32 (Data (Data'First + 4 * J + 3)), 24)); | ||
|
|
||
| Memory : Memory_Region | ||
| with | ||
| Import, | ||
| Address => (if This.Bank = 1 then First_Bank else Second_Bank); | ||
|
|
||
| Memory_32 : HAL.UInt32_Array (0 .. 16#F_FFFF# / 4) | ||
| with | ||
| Import, | ||
| Address => (if This.Bank = 1 then First_Bank else Second_Bank); | ||
| begin | ||
| Unlock; | ||
|
|
||
| if Data'Length mod 4 = 0 then | ||
| for J in 0 .. Data'Length / 4 - 1 loop | ||
| Programming (By_Word => True); | ||
| Memory_32 (Offset / 4 + J) := Get_Word (J); | ||
| end loop; | ||
| else | ||
| for J in Data'Range loop | ||
| Programming (By_Word => False); | ||
| Memory (Offset + J - Data'First) := Data (J); | ||
| end loop; | ||
| end if; | ||
|
|
||
| Wait_Flash; | ||
| Lock; | ||
|
|
||
| Success := True; | ||
| end Write; | ||
|
|
||
| ---------- | ||
| -- Lock -- | ||
| ---------- | ||
|
|
||
| procedure Lock is | ||
| begin | ||
| FLASH_Periph.CR := | ||
| (LOCK => True, -- Lock | ||
| others => <>); | ||
| end Lock; | ||
|
|
||
| ----------------- | ||
| -- Programming -- | ||
| ----------------- | ||
|
|
||
| procedure Programming (By_Word : Boolean) is | ||
| begin | ||
| Wait_Flash; | ||
|
|
||
| FLASH_Periph.CR := | ||
| (LOCK => False, -- (No-)Lock | ||
| PG => True, -- Programming | ||
| PSIZE => (if By_Word then 2 else 0), -- Parallelism size x32/x8 | ||
| others => <>); | ||
| end Programming; | ||
|
|
||
| ---------- | ||
| -- Read -- | ||
| ---------- | ||
|
|
||
| overriding procedure Read | ||
| (This : in out Flash_Memory; | ||
| Offset : Natural; | ||
| Data : out HAL.UInt8_Array; | ||
| Success : out Boolean) | ||
| is | ||
| Memory : Memory_Region | ||
| with | ||
| Import, | ||
| Address => (if This.Bank = 1 then First_Bank else Second_Bank); | ||
| begin | ||
| Success := Offset in Memory'Range; | ||
|
|
||
| if Success then | ||
| Data := Memory (Offset .. Offset + Data'Length - 1); | ||
| end if; | ||
| end Read; | ||
|
|
||
| ------------ | ||
| -- Unlock -- | ||
| ------------ | ||
|
|
||
| procedure Unlock is | ||
| begin | ||
| FLASH_Periph.KEYR := 16#4567_0123#; | ||
| Memory_Barriers.Data_Synchronization_Barrier; | ||
| FLASH_Periph.KEYR := 16#CDEF_89AB#; | ||
| Memory_Barriers.Data_Synchronization_Barrier; | ||
| Wait_Flash; | ||
| end Unlock; | ||
|
|
||
| ---------------- | ||
| -- Wait_Flash -- | ||
| ---------------- | ||
|
|
||
| procedure Wait_Flash is | ||
| begin | ||
| while FLASH_Periph.SR.BSY loop | ||
| null; | ||
| end loop; | ||
| end Wait_Flash; | ||
|
|
||
| end STM32.Flash; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| ------------------------------------------------------------------------------ | ||
| -- -- | ||
| -- Copyright (C) 2026, AdaCore -- | ||
| -- -- | ||
| -- Redistribution and use in source and binary forms, with or without -- | ||
| -- modification, are permitted provided that the following conditions are -- | ||
| -- met: -- | ||
| -- 1. Redistributions of source code must retain the above copyright -- | ||
| -- notice, this list of conditions and the following disclaimer. -- | ||
| -- 2. Redistributions in binary form must reproduce the above copyright -- | ||
| -- notice, this list of conditions and the following disclaimer in -- | ||
| -- the documentation and/or other materials provided with the -- | ||
| -- distribution. -- | ||
| -- 3. Neither the name of the copyright holder nor the names of its -- | ||
| -- contributors may be used to endorse or promote products derived -- | ||
| -- from this software without specific prior written permission. -- | ||
| -- -- | ||
| -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -- | ||
| -- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -- | ||
| -- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -- | ||
| -- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -- | ||
| -- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -- | ||
| -- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -- | ||
| -- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -- | ||
| -- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -- | ||
| -- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -- | ||
| -- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -- | ||
| -- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -- | ||
| -- -- | ||
| ------------------------------------------------------------------------------ | ||
|
|
||
| -- Embedded Flash memory for STM32F4xx with two banks. | ||
| -- | ||
| -- Embedded STM32 Flash memory has two 1M-byte banks. Each bank organized into | ||
| -- 12 sectors (4 x 16, 1 x 64, 7 x 128 kilo bytes). | ||
|
|
||
| with HAL.Flash; | ||
| with System; | ||
|
|
||
| package STM32.Flash is | ||
| pragma Preelaborate; | ||
|
|
||
| subtype Flash_Bank is Natural range 1 .. 2; | ||
|
|
||
| type Flash_Memory (Bank : Flash_Bank) is | ||
| limited new HAL.Flash.Flash_Memory with private; | ||
|
|
||
| Bank_Size : constant := 2 ** 20; -- 1 MB per bank | ||
| First_Bank : constant System.Address := System'To_Address (16#0800_0000#); | ||
| Second_Bank : constant System.Address := System'To_Address (16#0810_0000#); | ||
|
|
||
| overriding function Size (This : Flash_Memory) return Natural | ||
| is (Bank_Size); | ||
|
|
||
| overriding function Is_Busy (This : Flash_Memory) return Boolean; | ||
|
|
||
| overriding function Erasable_Region | ||
| (This : in out Flash_Memory; | ||
| Region : HAL.Flash.Memory_Region) | ||
| return HAL.Flash.Memory_Region; | ||
|
|
||
| use type HAL.Flash.Memory_Region; | ||
|
|
||
| overriding procedure Erase | ||
| (This : in out Flash_Memory; | ||
| Region : HAL.Flash.Memory_Region; | ||
| Success : out Boolean) | ||
| with Pre => Region = Erasable_Region (This, Region); | ||
|
|
||
| overriding procedure Read | ||
| (This : in out Flash_Memory; | ||
| Offset : Natural; | ||
| Data : out HAL.UInt8_Array; | ||
| Success : out Boolean); | ||
|
|
||
| overriding procedure Write | ||
| (This : in out Flash_Memory; | ||
| Offset : Natural; | ||
| Data : HAL.UInt8_Array; | ||
| Success : out Boolean); | ||
| -- The chip is able to write up to 256 bytes in one go if they are fitted | ||
| -- in aligned 256 bytes blocks. Otherwise, Write is split in several | ||
| -- commands and execution is blocked until all except the last one is | ||
| -- finished. | ||
|
|
||
| procedure Lock; | ||
| procedure Unlock; | ||
| procedure Programming (By_Word : Boolean); | ||
|
|
||
| private | ||
|
|
||
| type Flash_Memory (Bank : Flash_Bank) | ||
| is limited new HAL.Flash.Flash_Memory with null record; | ||
|
|
||
| end STM32.Flash; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| with "../../boards/stm32f429_discovery/stm32f429_discovery_full.gpr"; | ||
|
|
||
| project Flash_F429Disco extends "../shared/common/common.gpr" is | ||
|
|
||
| for Runtime ("Ada") use STM32F429_Discovery_Full'Runtime("Ada"); | ||
| for Target use "arm-eabi"; | ||
| for Main use ("flash.adb"); | ||
| for Languages use ("Ada"); | ||
| for Source_Dirs use ("../shared/stm32_flash/src", "../../arch/ARM/STM32/drivers/flash"); | ||
| for Object_Dir use "../shared/stm32_flash/obj/stm32f429disco"; | ||
| for Create_Missing_Dirs use "True"; | ||
|
|
||
| package Compiler renames STM32F429_Discovery_Full.Compiler; | ||
|
|
||
| end Flash_F429Disco; |
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This is
Region.From - 0, is that intended?