update

software/bootloader/SYSTEM/delay.c

@@ -0,0 +1,92 @@
+#include "delay.h"
+#include "sys.h"
+ 
+/* 
+//roughly delay
+void delay_us(u32 nus)
+{		
+	u32 i;
+	u16 temp;
+	temp = nus*SYS_CLK/15;
+	for(i=0;i<temp;i++);
+}
+
+//延时nms
+//nms:要延时的ms数
+void delay_ms(u16 nms)
+{
+	u32 i;
+	for(i=0;i<nms;i++) delay_us(1000);
+}
+*/
+
+void delay_init(void)
+{
+	HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
+	/* Configure the SysTick to have interrupt in 1ms time basis*/
+	HAL_SYSTICK_Config(SystemCoreClock / (1000U / uwTickFreq));
+}
+
+#if OS_SUPPORT 						    								   
+void delay_us(u32 nus)
+{		
+	u32 ticks;
+	u32 told,tnow,tcnt=0;
+	u32 reload=SysTick->LOAD;				   	 
+	ticks=nus*SYS_CLK; 						 
+	delay_osschedlock();					
+	told=SysTick->VAL;        				
+	while(1)
+	{
+		tnow=SysTick->VAL;	
+		if(tnow!=told)
+		{	    
+			if(tnow<told)tcnt+=told-tnow;//这里注意一下SYSTICK是一个递减的计数器就可以了.	
+			else tcnt+=reload-tnow+told;	    
+			told=tnow;
+			if(tcnt>=ticks)break;			
+		}  
+	};
+	delay_osschedunlock();															    
+}  
+
+void delay_ms(u16 nms)
+{	
+	if(delay_osrunning&&delay_osintnesting==0)    
+	{		 
+		if(nms>=fac_ms)						
+		{ 
+   			delay_ostimedly(nms/fac_ms);	
+		}
+		nms%=fac_ms;						 
+	}
+	delay_us((u32)(nms*1000));			
+}
+#else  
+	 
+void delay_us(u32 nus)
+{		
+	u32 ticks;
+	u32 told,tnow,tcnt=0;
+	u32 reload=SysTick->LOAD;				    	 
+	ticks=nus*SYS_CLK; 						
+	told=SysTick->VAL;        				
+	while(1)
+	{
+		tnow=SysTick->VAL;	
+		if(tnow!=told)
+		{	    
+			if(tnow<told)tcnt+=told-tnow;	
+			else tcnt+=reload-tnow+told;	    
+			told=tnow;
+			if(tcnt>=ticks)break;			
+		}  
+	}
+}
+
+void delay_ms(u16 nms)
+{
+	u32 i;
+	for(i=0;i<nms;i++) delay_us(1000);
+}
+#endif