About

FwLib_STC8 is a lite firmware library for STC8G/STC8H series MCU.

Official Datasheets, User Manuals

• STC8A/8F: Chinese, English
• STC8G: Chinese, English
• STC8H: Chinese, English

Features

• Compatible with SDCC and Keil C51
• Optimized for constrained 8-bit MCU resources
• Readable code for on-chip resources operation
• Demos for quick start

PlatformIO Quick Start

1. Clone this repository to local file system

# GitHub
git clone https://github.com/IOsetting/FwLib_STC8.git FwLib_STC8
# or Giteee (for Chinese users)
git clone https://gitee.com/iosetting/fw-lib_-stc8.git FwLib_STC8

2. Copy(or move) it to your PlatformIO project library, the file structure

├── include
├── lib
│   └── FwLib_STC8
│       ├── demo
│       ├── include
│       └── src
├── src
└── test

3. Add compile arguments in platformio.ini

build_flags =
    -D__CONF_FOSC=36864000UL                       ;The osc/irc frequency you MCU will be running on
    -D__CONF_MCU_MODEL=MCU_MODEL_STC8H3K32S2       ;change this to your MCU type
    -D__CONF_CLKDIV=0x02                           ;frequency trimming
    -D__CONF_IRCBAND=0x03
    -D__CONF_VRTRIM=0x19
    -D__CONF_IRTRIM=0x28
    -D__CONF_LIRTRIM=0x00

4. Include fw_hal.h in your code

#include "fw_hal.h"

then it's ready to go.

VS Code Syntax Problem

VS Code doesn't support some of SDCC syntax for Intel 8051 (issue 7146), if you want to eliminate syntax errors in code editor, add a separate env for code editing and add __SDCC_SYNTAX_FIX in build_flags:

build_flags =
    -D__SDCC_SYNTAX_FIX
    -D__CONF_FOSC=36864000UL
    -D__CONF_MCU_MODEL=MCU_MODEL_STC8H3K32S2
    ...

This special env is for code editing only, building and uploading should use the normal env.

Keil C51 Quick Start

1. Clone this repository to local file system

# GitHub
git clone https://github.com/IOsetting/FwLib_STC8.git FwLib_STC8
# or Giteee (for Chinese users)
git clone https://gitee.com/iosetting/fw-lib_-stc8.git FwLib_STC8

2. Copy(or move) it to your Keil C51 project directory,
3. Add it to project through Project -> Manage -> Project Items,
4. Open project option dialog by clicking Project -> Options for Target ... , switch to C51 tab, and input following content in Preprocessor Symbols -> Define:

__CX51__, __CONF_MCU_MODEL=MCU_MODEL_STC8H3K32S2,__CONF_FOSC=36864000UL

The explanation of these arguments

   __CX51__ This will tell the macros to switch to Keil C51 keywords
   __CONF_MCU_MODEL, change this to your MCU type, please look into FwLib_STC8/include/fw_conf.h for all available types.
   __CONF_FOSC The osc/irc frequency you MCU will be running on. It equals to the frequency this MCU will be trimmed to in STC-ISP.

5. Include fw_hal.h in your code

#include "fw_hal.h"

then it's ready to go.

Macros

Some macros were introduced for code compatibility with Keil C51 and SDCC.

The naming is from sdcc compiler.h. If you want your code to work with both compilers, you need to stick to these macros instead of the compiler specific keywords:

Here is a list of the macros:

Macro	Keil C51	SDCC
__BIT	bit	__bit
__DATA	data	__data
__IDATA	idata	__idata
__PDATA	pdata	__pdata
__XDATA	xdata	__xdata
__CODE	code	__code
SBIT(name, addr, bit)	sbit name = addr^bit	__sbit __at(addr+bit) name
SFR(name, addr)	sfr name = addr	__sfr __at(addr) name
SFRX(addr)	(*(unsigned char volatile xdata *)(addr))	(*(unsigned char volatile __xdata *)(addr))
SFR16X(addr)	(*(unsigned int volatile xdata *)(addr))	(*(unsigned int volatile __xdata *)(addr))
INTERRUPT(name, vector)	void name (void) interrupt vector	void name (void) __interrupt (vector)
INTERRUPT_USING(name, vector, regnum)	void name (void) interrupt vector using regnum	void name (void) __interrupt (vector) __using (regnum)
NOP()	nop()	__asm NOP __endasm

The definition of these macros can be found in include/fw_reg_base.h

License

Copyright (c) 2021-present IOsetting iosetting@outlook.com

The FwLib_STC8 is licensed under the permissive Apache 2.0 license, you can use it in both commercial and personal projects with confidence.