蓝桥杯嵌入式STM32 零碎笔记

1.启用assert_param

启用assert_param需要在Options for Target 里面C/C++ 里面define   USE_FULL_ASSERT   然后在main.c文件里加入assert_failed函数即可。

void assert_failed(uint8_t* file, uint32_t line)
{
	 /* User can add his own implementation to report the file name and linenumber, 
	ex: printf("Wrong parameters value: file %s on line %d\r\n", file,line) */ 
	/* Infinite loop */
	printf("Wrong parameters value: file %s on line %d\r\n", file,line); 
	while(1){} 
}

2.LCD格式化输出字符串

勘误：此处建议用snprintf，函数sprintf可能会越界（debug发现的，搞了半天，蛋疼！）

			sprintf( text,"%-20s",USART2_DATA.RX_BUF);//左对齐补空格
			LCD_DisplayStringLine(Line9, (u8*)text);

3.TIM 时钟 分频

CK_CNT（定时器时钟）等于fCK_P