Notes on 30 steps of introduction to the Internet of things of yangtao electronics STM32 III. cubemx graphical programming and setting the IO port on the development board

This document is used as the collation of Carambola electronic video ,B Station links ： Episode four
One 、 Turn on RCC External clock for 、 Including external high-speed clock HSE And external low-speed clock LSE

The meaning of the three options of clock configuration ：
If disabled, you can only use the internal clock
The bypass clock source is generally an active crystal oscillator
Crystal and ceramic oscillators are generally passive crystal oscillators

Two 、 Turn on RTC function

3、 ... and 、 Configure clock tree
Generally speaking, the higher the clock frequency , The higher the performance , The higher the power consumption ; On the contrary, the lower the frequency , The lower the power consumption .

Four 、 Set up IO port
As can be seen from the schematic diagram , Two LED1 and LED2 We received PB0 and PB1, Must let LED Lighten up , You need to IO The port is set to output high level .



Overview of Carambola development board

Core board schematic overview machine IO Configuration situation

Crystal oscillator configuration

LED Configuration situation ： High level 、 Push pull output 、 No up and down 、 High speed output

Key configuration ： Pull up input

Buzzer configuration ： High level 、 Push pull output 、 No up and down 、 High speed output

Serial port configuration ：

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Carambola IOT Overview of schematic diagram of development board floor and IO To configure

Wake up key and PA0 Reuse , Because on the core board PA0 It's already set up , So there is no need to set
JTAG The particularity of , Need to be in SYS It's set up inside

Two ADC Interface configuration ： Analog input

Relay circuit ： High level 、 Open drain output 、 No up and down 、 High speed output

Temperature and humidity sensor ： High level 、 Push pull output 、 No up and down 、 High speed output

RS458 Bus circuit ：
PA8: Low level 、 Push pull output 、 Pull up 、 High speed output 、 Used to switch whether to receive data or send data
PA2、PA3 Set serial port mode



CAN Bus circuit ：



USB、SPI Flash memory 、 Reserved row needle ：




Bluetooth module ：

wifi modular ：


Development board all IO The initialization of the port is shown in the figure below ：

PS: A brief introduction to the clock ：

STM32F103 Single chip microcomputer CAN and USB Work together in the same group RAM Space , The two functions cannot be used at the same time .
PC13 There are requirements for applications , Pay attention to , As for what requirements , I haven't studied , Anyway, that's what the video says .
Simulation interface for video JTAG Of 5 Foot mode ; I prefer to use it SW Bipedal mode , This is more economical IO mouth .