Flash memory usage and stm32subemx installation tutorial [day 3]

【1】STM32 FLASH

Flash Internal memory , A kind of memory device , It's a kind of nonvolatile （ Non-Volatile ） Memory .
flash Flash memory is nonvolatile memory , It can be rewritten and reprogrammed for the memory cell block of the block . whatever flash The write operation of the device can only be carried out in the empty or erased cell , So most of the time , Erase must be performed before writing .

` Development board STM32F407ZET6 Of flash size ：512KB  The program solidified to FLASH, Need to be right BOOT0 And BOOT1 Set it up `

【2】 The embedded Flash Interface

The main features ● Flash Read operations
● Flash Programming / Erase operation
● read / Write protect
● I-Code Prefetch operation on
● I-Code Upper 64 Cache （ 128 A wide ）
● D-Code Upper 8 Cache （ 128 A wide ）

【3】 The embedded Flash

Flash It has the following main characteristics ：

●  about  STM32F40x  and  STM32F41x, Capacity as high as  1 MB; about  STM32F42x  and  STM32F43x,
 Capacity as high as  2 MB
● 128  Bit width data reading 
●  byte 、 Half word （ Two bytes ）、 word （ Four bytes ） And double word data writing 
●  Sector erase and full erase 
●  Memory organization structure 

Flash The structure is as follows ：

— , It is divided into  4  individual  16 KB  A sector 、 1  individual  64 KB  Sectors and  7  individual  128 KB  A sector 
—  The system is stored in the main memory block storage , The device starts from the system memory in bootstrap mode 
— 512  byte  OTP（ One time programmable ）, For storing user data 
OTP  Area and  16  Two extra bytes , Used to lock the corresponding  OTP  Data blocks .
—  Option bytes , Used to configure read / write protection 、 BOR  Level 、 Software / The hardware watchdog and devices are in standby or 
 Reset in stop mode .

【4】FLASH Write data function

// Write two words （8 Bytes ）
FLASH_Status FLASH_ProgramDoubleWord(uint32_t Address, uint64_t Data);
// Write （4 Bytes ）
FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data);
// Write half a word （2 Bytes ）
FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data);
// Write Bytes （1 Bytes ）
FLASH_Status FLASH_ProgramByte(uint32_t Address, uint8_t Data);

【5】FLASH receive data

void Flash_Read(u32 addr, u8* read_buff, u32 len)
{
    
	u32 FLASH_USER_START_ADDR, FLASH_USER_END_ADDR, uwAddress;

	// Calculation start address 
	FLASH_USER_START_ADDR = addr;
	// Calculation end address 
	FLASH_USER_END_ADDR   = FLASH_USER_START_ADDR+len;
	uwAddress = FLASH_USER_START_ADDR;   //0x08020000
	while (uwAddress < FLASH_USER_END_ADDR)
	{
    
		*read_buff = *(__IO uint8_t*)uwAddress;  //  Dereference read data from sector   Read character by character 
		read_buff++;
		uwAddress = uwAddress + 1;
  }

【6】STM32CUBEMX

1、HAL library

【1】HAL yes Hardware Abstraction Layer Abbreviation , Chinese name ： Hardware abstraction layer .HAL Kuo is ST by STM32 The latest abstract layer embedded software , It can better ensure cross STM32 Maximum portability of the product . The library provides a consistent set of middleware components , Such as RTOS,USB,TCP/ IP And graphics etc. .
【2】 HAL The library is based on a non limiting BSD license agreement （Berkeley Software
Distribution） And released open source code .
【3】 ST Made middleware stack （USB Host and device library ,STemWin） With license patterns that allow easy reuse , As long as it's in the ST The company's MCU Use on chip , Middleware in the library (USB host / Equipment library ,STemWin) The protocol stack is allowed to be modified at will , And can be used repeatedly . As for middleware based on other well-known open source solutions （FreeRTOS,FatFs,LwIP and PolarSSL） They also have friendly user license terms .

【4】 so to speak HAL Library is used to replace the previous standard peripheral Library . Compared to the standard peripheral Library ,STM32Cube HAL The library shows a higher level of abstract integration ,HAL API Focus on the common functions of peripheral devices , In this way, it is convenient to define a general set of users API The function interface , So it can be easily realized from a STM32 The product was ported to a different STM32 Series of products .HAL Kuo is ST The library that will be promoted in the future , From the year before ST There is no new chip STD The library , such as F7 series . at present ,HAL The library already supports STM32 All line products .

ST Provide library functions ： Standard library 、LL library 、HAL
Graphic development methods :STM32CUBEMX+KEIL STM32CUBEIDE(STM32CUBEMX+KEIL)

【7】 Software installation steps

1、 install keil Software 
2、 Double click installation HAL library 

STM32 All series are up to date HAL Library Download
link ：https://pan.baidu.com/s/127B1NmYHPLc Address cUjzjxCiG0w
Extraction code ：abeg

【8】 install STM32CUBEMX

Download url ：https://blog.csdn.net/wwwqqq2014/article/details/116292865

1、STM32CubeMX Software introduction

STM32CubeMX It is a graphical configuration tool launched by Italian French semiconductor , The relevant configuration can be realized through the operation of fool , Finally, it can generate C The language code , It supports a variety of tool chains. At present, it provides a completely free version , also , Plug in installation , Can be STM32CubeMX Integrated in one IDE, It's very convenient to use . Next, let's install it

Preparation stage ：
link ：https://pan.baidu.com/s/1CYGH2LevHiOj9O34L38Uzg
Extraction code ：ujvv

Software installation steps
1、 Double chicken installation （ Or run the installation with administrator privileges ）STM32CubeMX What software needs java Environmental Science .

Installing ...................

installation is complete , Click close to

2、 Double click installation

（ Or run the installation with administrator privileges ）STM32CubeMX Software .

Loading ...........

Installing ..................

3、 open STM32CubeMX

（ The opening process may be a little long , Wait a minute no ）, install STM32CubeMX Software development package

Downloading package , And install , Wait for .

Above is STM32CubeMX The whole process of installation . After installation , You can do your own STM32CubeMX The journey of development .

3、 Development steps

1、 From chip build engineering

2、 Set the clock

3、 Pin settings

4、 Code generation settings

4、 The generated code

【END】 SA yo Na yo