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Keil

Making it more comfortable to look at

代码小A9/25/26Less than 1 minute

I've used LVGL a lot before and even ported it to microcontrollers, but I've never studied it systematically — I'm still at a superficial level. So I plan to study LVGL properly, though not all that properly. How should I put it — watch me learn, and you'll pick it up too.

Environment Setup

代码小A9/13/26About 11 min

lwIP Study Log

I plan to learn lwIP based on the tutorials from ALIENTEK (正点原子). The board I'm using is an ALIENTEK stm32f407zgt6 minimum system board plus a LAN8720A for network communication.

The development IDE is CLion, using the open-source embedded toolchain: arm-gnu-toolchain-15.3.rel1-mingw-w64-i686-arm-none-eabi
Reference book: 《lwIP开发指南_V1.7.pdf》

代码小A9/13/26About 3 min

Catalog

代码小A7/22/26Less than 1 minute

Makefile Analysis

Taking some real code as examples:

Case 1

ifneq ($(MKENV_INCLUDED),1)
include mkenv.mk
endif

subdirs-y :=
include apps.mk

.PHONY: all clean distclean

all: $(subdirs-y)
	@echo "Make Applications done."

ifneq ($(strip $(subdirs-y)),)
.PHONY: $(subdirs-y)

$(subdirs-y):
	@echo "[BUILD] applications $@"
	@$(MAKE) -C $@ all || exit $?;
endif

clean:
	@if [ -n "$(subdirs-y)" ]; then \
		for dir in $(subdirs-y); do \
			echo "[CLEAN] applications $$dir"; \
			$(MAKE) -C $$dir clean || exit $?; \
		done; \
	fi

distclean: clean
	@if [ -n "$(subdirs-y)" ]; then \
		for dir in $(subdirs-y); do \
			echo "[DISTCLEAN] applications $$dir"; \
			$(MAKE) -C $$dir distclean || exit $?; \
		done; \
	fi

.PHONY: gen_kconfig
gen_kconfig:
	@echo "# Dynamic generate by Makefile, DO NOT Modify it.\n" > $(SDK_BUILD_DIR)/Kconfig.app; \
	for dir in $(shell find $(SDK_APPS_SRC_DIR) -maxdepth 1 -mindepth 1 -type d); do \
		echo "source \"$$dir/Kconfig\"" >> $(SDK_BUILD_DIR)/Kconfig.app; \
	done; \

代码小A5/20/26About 8 min

Setting Up the RT-Smart Environment

Install Docker and Configure Permissions

sudo apt update
sudo apt install docker.io
sudo usermod -aG docker $USER
newgrp docker  # refresh the user group, or just log out and log back into the terminal

代码小A5/20/26Less than 1 minute

00-bootloader Prerequisites

Microcomputer Fundamentals

Stack Pointer SP (Stack Pointer)

"Picture this, everyone: a microcontroller running code is just like you reading an incredibly thick novel (and that novel is the Flash memory).
Your eyes can't take in a whole page at once — you have to read it line by line. To keep from losing your place, you'd use your index finger to point at whatever line you're reading right now. Finish a line, and the finger slides down one line.
That index finger used for pointing the way is the PC (Program Counter)!
What the PC holds is always an address, which is basically telling you: 'Boss CPU, which line of code should be executed next?'
What if a phone call suddenly comes in (an interrupt)? What do you do? You'd write down where your finger is currently pointing on a slip of paper (saving the context), then run off to answer the call. When you're back, you glance at the slip of paper, point your finger back at that line, and keep reading! But if you forcibly bend that finger over to a blank page full of gibberish (say, pointing it at 0x00000000), you'll instantly freeze up and the whole thing dies — that's a HardFault!"

Summary: the value of the PC register is the location of the next piece of code to be executed — extremely important!!

代码小A5/20/26About 8 min

01-Jump

Basic Info

The stm32f103c8t6 has 64KB of flash and 20KB of SRAM

Create an APP

Configure Debug

Configure the Clock

Configure the LED

代码小A5/20/26About 2 min

02-UART Flashing

Planning

The stm32f103c8t6 has 64KB of flash and 20KB of SRAM
0kb - 16kb: the first 16KB is the bootloader's space
16kb - 20Kb: the middle 4KB is the parameter area
20kb - 64KB: everything after that is the APP area

Design Approach

代码小A5/20/26Less than 1 minute

03-Remote OTA Firmware Update for STM32 via ESP8266

test

代码小A5/20/26Less than 1 minute