Preface

Serial communication is a very common way of serial communication between devices , It is simple and convenient , Have a broad audience

One 、 The difference between register and firmware library based programming

Compared with the way of Library Development , If we directly configure registers , The amount of code generated in this way is a little less , But we use stm32, This is different , because stm32 Our resources are sufficient , So we can and are willing to sacrifice CPU Resources are put into storage for development . And we also found that the writing method of firmware library is simpler , It's easy for newcomers like me to understand , There are more information about this on the Internet .

Two 、STM32 Of USART Window communication

1. Get ready

Just like the previous experiment , We used the following tools and equipment ：
High speed Simulator
Wildfire guider STM32F103VET6 High speed version
keil5
Serial debugging assistant Fire Tools（v1.0.1.5）
USBQ drive CH340（ Only the serial port of the development board has a driver , The simulator does not need to install drivers ）

2. experiment

As before , Connect the equipment , After confirming that the equipment is correct , Turn on the switch .

Still pay attention to the links in the serial port ！ Or there will be a big problem ：

install USB Serial port drive CH340（ Find relevant information in the development board store you bought ）

Install the serial port multifunctional debugging assistant Fire Tools
This is the debugging assistant that matches my development board

Just click

Set the baud rate for serial port debugging to 115200,1 Bit stop bit , No parity bit
Then we open the corresponding project , Here's the picture

This is the project included in the learning materials , Now let's make some changes


The above figure is modified main.c and stm32f10x_it.c
Now compile , No problem

Click the magic wand to configure



I studied it , Find out SWJ In fact, both options are ok , Because it is a high-speed simulator , Configuration complete . Now debug and burn .


Burn successfully ！ Now let's look at the results .

complete

3、 ... and .C Global variables in language programs 、 local variable 、 Pile up 、 Stack

We can use memory as 4 Zones ： Stack 、 Pile up 、 overall situation （ static state ） Storage area and constant storage area

1. Stack 、 Pile up 、 overall situation （ static state ） Storage area and constant storage area

（ One ） Stack
Stack （stack） Also known as the stack , It's an operationally constrained linear table . A linear table limited to insert and delete operations only at the end of the table . This end is called the top of the stack , relatively , Call the other end the bottom of the stack . Inserting a new element into a stack is also called a push 、 Push or push , It's putting a new element on top of the top of the stack , Make it the new top element ; Removing an element from a stack is also called making a stack or backing a stack , It removes the top element of the stack , Make its adjacent elements the new top of the stack .
（ Two ） Pile up
Pile up (Heap) Is a general term for a special class of data structures in computer science . A heap is usually an array object that can be seen as a complete binary tree .

（ 3、 ... and ） overall situation / Static storage area
It can be understood that global variables and static variables are allocated to the same block of memory

（ Four ） Constant store
and “ overall situation / Static storage area ” almost , Just store constants

2.ubuntu Programming in the system

establish .c file , And use gcc perform , result

3.keil verification