使用定时器来精确控制数据发送的时间间隙，保证和其他小板不冲突

source/interface/if_timer.c

@@ -0,0 +1,73 @@
+
+
+
+#include "board.h"
+#include "stm32f10x.h"
+
+
+
+static int init(timer_def *t){
+  static int inited=0;
+  if(inited!=0) return 0;
+  inited=1;
+	TIM_TimeBaseInitTypeDef timer;
+
+	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE );
+	NVIC_DisableIRQ(TIM4_IRQn);
+	TIM_DeInit(TIM4);							
+	timer.TIM_Period           = 10000-1;		//1s
+	timer.TIM_Prescaler        = 7200-1;//1K;	//预分频72MHz主频，分频后时钟周期0.1ms
+	timer.TIM_ClockDivision    = TIM_CKD_DIV1;  //分频
+	timer.TIM_CounterMode      = TIM_CounterMode_Up;  //向上计数
+	timer.TIM_RepetitionCounter=0;
+	TIM_TimeBaseInit(TIM4,&timer);
+	TIM_SetCounter(TIM4,0);
+	TIM_ARRPreloadConfig(TIM4, ENABLE);
+  TIM_SelectOutputTrigger(TIM4,TIM_TRGOSource_Update);
+	TIM_Cmd(TIM4, ENABLE);
+
+	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE );
+	NVIC_DisableIRQ(TIM5_IRQn);
+	TIM_DeInit(TIM5);							
+	timer.TIM_Period           = 0xffff;// 
+	timer.TIM_Prescaler        = 0;//不分频
+	timer.TIM_ClockDivision    = TIM_CKD_DIV1;
+	timer.TIM_CounterMode      = TIM_CounterMode_Up;  //向上计数
+	timer.TIM_RepetitionCounter=0;
+	TIM_TimeBaseInit(TIM5,&timer);
+	TIM_SetCounter(TIM5,0);
+	TIM_ARRPreloadConfig(TIM5, ENABLE);
+  TIM_ITRxExternalClockConfig(TIM5, TIM_TS_ITR2);
+	TIM_Cmd(TIM5, ENABLE);
+
+
+  return 0;
+}
+
+static int deinit(timer_def *t){
+	TIM_DeInit(TIM4);							
+	TIM_DeInit(TIM5);							
+  return 0;
+}
+
+static uint32_t read(timer_def *t)
+{
+  uint32_t ms;
+  ms=TIM_GetCounter(TIM4)/10+TIM_GetCounter(TIM5)*1000;
+  return ms;
+}
+static int write(timer_def *t,const uint32_t value)
+{
+  TIM_Cmd(TIM4,DISABLE);
+  TIM_SetCounter(TIM4,(value%1000)*10);
+  TIM_SetCounter(TIM5,value/1000);
+  TIM_Cmd(TIM4,ENABLE);
+  return 0;
+}
+
+
+
+
+
+timer_init_export(timer,init,deinit,read,write,0);
+

source/interface/if_timer.h

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+
+#ifndef if_timer_h__
+#define if_timer_h__
+
+
+
+
+
+
+
+
+
+#endif
+
+
+
+