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https://github.com/wangtz0607/buaa-embedded-systems-labs
https://github.com/wangtz0607/buaa-embedded-systems-labs
Last synced: 17 days ago
JSON representation
- Host: GitHub
- URL: https://github.com/wangtz0607/buaa-embedded-systems-labs
- Owner: wangtz0607
- Created: 2024-11-27T03:09:20.000Z (26 days ago)
- Default Branch: main
- Last Pushed: 2024-12-04T04:10:37.000Z (19 days ago)
- Last Synced: 2024-12-04T05:19:35.769Z (19 days ago)
- Language: C
- Size: 6.84 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# buaa-embedded-systems-labs
## Lab 0
### Troubleshooting
Problem:
```plaintext
arm-linux-gnueabihf-gcc: cannot execute: required file not found
```
Solution:
```sh
sudo dpkg --add-architecture i386
sudo apt-get update
sudo apt-get install libc6:i386
```
Problem:
```plaintext
*** Unable to find the ncurses libraries or the
*** required header files.
*** 'make menuconfig' requires the ncurses libraries.
***
*** Install ncurses (ncurses-devel) and try again.
***
```
Solution:
```sh
sudo apt-get install libncurses-dev
```
Problem:
```plaintext
Your display is too small to run Menuconfig!
It must be at least 19 lines by 80 columns.
```
Solution: Enlarge the terminal window.
Problem:
```plaintext
/usr/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x50): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here
```
Solution:
```patch
--- scripts/dtc/dtc-lexer.l.bak
+++ scripts/dtc/dtc-lexer.l
@@ -39,7 +39,7 @@
#include "srcpos.h"
#include "dtc-parser.tab.h"
-YYLTYPE yylloc;
+extern YYLTYPE yylloc;
/* CAUTION: this will stop working if we ever use yyless() or yyunput() */
#define YY_USER_ACTION \
```
```patch
--- scripts/dtc/dtc-lexer.lex.c_shipped.bak
+++ scripts/dtc/dtc-lexer.lex.c_shipped
@@ -637,7 +637,7 @@
#include "srcpos.h"
#include "dtc-parser.tab.h"
-YYLTYPE yylloc;
+extern YYLTYPE yylloc;
/* CAUTION: this will stop working if we ever use yyless() or yyunput() */
#define YY_USER_ACTION \
```
Problem:
```plaintext
arm-linux-gnueabihf/bin/as: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory
```
Solution:
```sh
sudo apt-get install lib32z1
```
## Lab 1
```sh
arm-linux-gnueabihf-gcc main.c sort.s
```
Example input:
```plaintext
5 2 4 6 1 3 -1
```
Example output:
```plaintext
5 2 4 6 1 3
1 2 3 4 5 6
```
### Troubleshooting
Problem:
```plaintext
unknown filesystem type 'ntfs'
```
```plaintext
unknown filesystem type 'exfat'
```
Solution: Format the USB drive as ext4.
Problem:
```plaintext
version `GLIBC_2.39' not found
```
Solution: Link the binary statically:
```patch
-arm-linux-gnueabihf-gcc main.c sort.s
+arm-linux-gnueabihf-gcc -static main.c sort.s
```
## Lab 2-1
```sh
arm-linux-gnueabihf-gcc main.c
```
### Basics
#### UART Data Frame Format
| Start Bit | Data Bits | Parity Bit | Stop Bits |
|:-:|:-:|:-:|:-:|
| 1 | 5 - 9 | 0 / 1 | 1 / 1.5 / 2 |
Typical configuration:
| Start Bit | Data Bits | Parity Bit | Stop Bits |
|:-:|:-:|:-:|:-:|
| 1 | 8 | 0 | 1 |
##### Example
Data: `0b01000001` (`'A'`)
UART data frame:
| Start Bit | Data Bits | Parity Bit | Stop Bits |
|:-:|:-:|:-:|:-:|
| `0` | `01000001` | (None) | `1` |
### Tips
#### Creating Virtual Serial Ports
```sh
sudo socat PTY,link=/dev/ttyV0,raw,echo=0 PTY,link=/dev/ttyV1,raw,echo=0
```
```sh
sudo stty -F /dev/ttyV0 9600
sudo stty -F /dev/ttyV1 9600
```
```sh
sudo screen /dev/ttyV0 9600
```
```sh
sudo screen /dev/ttyV1 9600
```
## Lab 2-2
```sh
arm-linux-gnueabihf-gcc main.c -lpthread
```